49results about How to "Strengthen the matrix" patented technology

The invention relates to a bamboo-based / thermoplastic plastic nanocomposite material and manufacturing technology thereof. The technology comprises the following steps of: using a thermoplastic plastic as a matrix, and using bamboo fibers as an enhanced phase; modifying the bamboo fibers through nano particles so as to improve the compatibility with the matrix, the flux flow rate and the mold resistance of the composite material; and manufacturing the bamboo-based / thermoplastic plastic nanocomposite material through highly mixing, pelleting, extrusion molding, and other processing technology.The invention provides a bamboo-based / thermoplastic plastic nanocomposite material which has the advantages of high physical mechanical strength, high interface compatibility, high flux flow rate andhigh mold resistance. The bamboo processed wastes and wasted plastics are fully utilized, and the ecological environment is protected. The product can be applied to outdoor gardening landscape, outdoor furniture, outdoor floors, wall hanging boards, guardrails, trays, packaging cases and automotive interior decoration materials, and the like.

The invention relates to a composite coating with high-temperature oxidation resistance and abrasion resistance prepared on the surface of a titanium alloy. The surface layer of the composite coating is a continuous compact Al2O3 oxidation film layer with the thickness of 1-3 microns; an Al settled layer with the thickness of 10-15 microns and a Ni-Co-Cr-Al-Y alloy layer with the thickness of 4-6 microns are arranged in the middle of the composite coating; the metallurgical bonding between the composite coating and a matrix is realized through a NiCoCrAlTi diffusion alloy layer; a uniform continuous compact Al2O3 oxidized film layer is arranged on the surface of the composite coating, and the surface of the composite coating does not have defects of holes, cracks and the like, so that the wear resistance and high-temperature oxidation resistance of the composite coating are greatly improved; the element Al is in graded distribution along the thickness direction in a NiCoCrAlY alloy layer and a NiCoCrAlY diffusion layer to facilitate the combination of coatings, and the storage content of Al phase is high, so that the high-temperature oxidation resistance of the composite coating can be further improved; the juncture part between the composite coating and the matrix is flat and straight and is provided with a bright white mutual diffusion layer which is in metallurgical bonding with the matrix with a firm bonding force. An alloy infiltrated layer is prepared from gamma'-Ni3Al which is a hard phase, is tiny and in dispersed distribution, and can strengthen the matrix and improve the hardness and wear resistance of the matrix.

The invention belongs to the metallic material field, relating to aluminium base composite materials used in a piston and a preparation method thereof. The composite materials comprise a matrix alloy and a wild phase. The matrix alloy comprises silicon, copper, nickel, magnesium, phosphorus, titanium and aluminium and is characterized in that the matrix alloy comprises the components according to the mass percent: 10.0-25.0% of silicon, 0.5-2.5% of copper, 0.5-4.0% of nickel, 0.2-1.5 of magnesium, 0.2-3.0 % of phosphorus, 0.01-1.0% of titanium and the rest is magnesium. The wild phase is AIP particles generated by reaction in situ. The preparation method comprises the following steps: the raw materials are weighted according to the mass percent; flash set argon pulverization treatment is carried out on Si-P interalloy; the commercially pure aluminium, silicon, copper, nickel, magnetism and titanium are melted into multielement aluminium alloy in a smelter hearth in the temperature of 760 DEG C to 850 DEG C, and is added with flash set Si-P interalloy particles after refining; the metal mold gravity casting or the extrusion casting are used for pouring piston rough; T6 heat treatment is carried out on the casting rough. In the invention, the production can be carried out by using a common aluminium alloy smelting unit in atmosphere condition. The invention has simple technique and low production cost.

The invention relates to a high-strength cast aluminum-silicon alloy for an engine body and a preparation method thereof, belonging to the field of metal materials. The alloy comprises the following components in percentage by weight: 12.0-14.0% of Si, less than 0.3% of Ni, 3.0-5.0% of Cu, 0.3-0.8% of Fe, 0.4-0.8% of Mn, less than 0.4% of Mg, 0.1-0.2% of Ti, less than 0.27wt% of Zr and balance of Al. Heat treatment parameters are as follows: the solution treatment is carried out at 510+ / -5 DEG C for 5-8h and then water quenching is carried out at room temperature; and the aging treatment is carried out at 160+ / -5 DEG C for 6-10h and then air cooling is carried out. The tensile strength and the yield strength of the alloy at room temperature after heat treatment respectively reach 316-336MPa and 245-263MPa, the elongation of the broken alloy reaches 0.72-0.83%, and the Brinell hardness reaches 155-166HBW to the maximum. Compared with the similar alloys, the alloy of the invention has the advantages of high mechanical properties, low content of Ni elements, reduction of content of noble elements in the alloy, wider allowed fluctuation range of content of Fe elements, good cast ingot quality, simple processes and strong operability.

The invention discloses a fixed-length shear blade and a manufacturing method of the fixed-length shear blade. The fixed-length shear blade comprises the following components by weight percent: 0.75-1.00% of C, 0.60-1.40% of Si, 0.20-0.50% of Mn, 6.50-8.00% of Cr, 2.50-4.00% of Mo, 1.80-3.50% of V, less than or equal to 0.020% of S, less than or equal to 0.020% of P, the balance of Fe and the unavoidable impurities; and the manufacturing method of the fixed-length shear blade comprises the technological process of: smelting by an induction furnace, electrode bar pouring, electroslag remelting, ingot casting, forging, preheating treatment, rough machining, hardening and tempering heat treatment, semi-finishing, final heat treatment and finish machining. The fixed-length shear blade is high in strength and wear resistance, thus guaranteeing the shock resistance of the blade.

The invention relates to a casting aluminium-silicon alloy for motor piston and a preparation method thereof, belonging to the field of metal materials. The aluminium-silicon alloy comprises 12.0-14.0 wt% of Si, less than 0.3 wt% of Ni, 1.8-3.0 wt% of Cu, 0.3-0.8 wt% of Fe, 0.3-0.6 wt% of Mn, less than 0.4 wt% of Mg, 0.1-0.2 wt% of Ti, less than 0.3 wt% of Zr and balance of Al. The heat treatment parameters are as follows: 510+ / -5 DEG C*5-8h+water quenching under room temperature for solution treatment; and 160+ / -5 DEG C*6-10h+air cooling for ageing treatment. The tensile strength and yield strength of the alloy under the room temperature reach 283-305MPa and 178-190MPa respectively and the elongtation percentage after breaking reaches 1.8-3.2%. Compared with similar alloys, the aluminium-silicon alloy of the invention has higher mechanical property, reduces Ni element content and noble metal element content of the alloy and allows Fe element to fluctuate in wider scope; the invention has good quality of ingot casting, simple process and strong operability.

The invention discloses a composite refining and modifying agent capable of improving friction and wear properties of multi-element aluminum-silicon alloy, and belongs to the technical field of aluminum-silicon alloy. The composite refining and modifying agent comprises the following ingredients in percentage by mass: 10-14% of Ti, 8-10% of Cr, 8-10% of Ni, 8-10% of Sr, 5-7% of Ce, 5-7% of La, 5-7% of Nb, 3-4% of Pr, 3-4% of Er, 3-4% of Eu, 3-4% of Y, 3-4% of Ba, 2-3% of B, 2-3% of Na, 1-2% of V and the balance being Al. The composite refining and modifying agent is represented as massive grey white alloy, particle size range is 0.1-20mm, melting point range is 850-1150 DEG C and effective addition range is 0.2-0.8%; and the composite refining and modifying agent disclosed by the invention can significantly improve friction and wear properties of multi-element aluminum-silicon alloy.

The invention relates to a bearing roller of a 4200 mm or above wide and thick plate rolling mill and a manufacturing process of the bearing roller, and belongs to the technical field of forging. Thebearing roller comprises, by mass percent, 0.50 to 0.65% of C, 0.17 to 0.50% of Si, 0.80 to 2.0% of Mn, 0.30 to 0.70% of Ni, 1.60 to 2.5% of Cr, 0.30 to 1.00% of Mo, 0.10 to 0.35% of V, not larger than 0.020% of P, not larger than 0.010% of S, not larger than 0.15% of Cu, not large than 1.0 ppm of H, and the balance iron and inevitable impurities. The carton content of a new material of the super-huge type forged steel bearing roller is low, alloy elements of chromium, nickel and vanadium are added, the microstructure comprises bainite and pearlite, the strength and toughness of the material are improved, the solidification segregation of a large steel ingot is reduced, the comprehensive performance is good, and the service life is long.

The invention relates to an extrusion deformation aluminum-lithium alloy with high Zn content and high strength and toughness, and a preparation method thereof. The alloy comprises, by weight, 4.1%-5.5% of Zn, 2%-4.5% of Cu, 2%-3% of Mg, 1%-2% of Li, 0.1%-0.5% of Zr, less than 0.25% of impurity elements in total, and the balance Al. Through melting and casing as well as extrusion deformation, theextrusion deformation aluminum-lithium alloy with high Zn content is prepared. Through deformation and aging treatment, not only lots of Tl(Al2CuLi) but also S' (Al2CuMg) phases and eta' (MgZn2) phases are precipitated from the alloy with high Zn content, and the strength and toughness of the alloy are improved effectively. The aluminum-lithium alloy prepared with the preparation method provided by the invention not only has excellent mechanical properties, but also is low in alloy cost, and has broad application prospects in the fields, such as aerospace, high-speed railways and robots.

The invention relates to a method for forming the internal threads of a composite material, which comprises: circumferentially winding a nonwoven fabric impregnated with resin on the surface of a threaded part of a mandrel; spreading a resin substrate mixed with inorganic material crystal whiskers on the circumferentially wound nonwoven fabric layer, wherein the height of the resin is no lower than the top of the teeth of the threads of a mold; circumferentially paving a reinforcing unidirectional fiber fabric on the surface of the mandrel, wherein the fiber direction of the reinforcing unidirectional fiber fabric is consistent with that with the mandrel and the thickness of the reinforcing unidirectional fiber fabric is no greater than one third of the height of the teeth; winding reinforcing circumferentially wound fibers on the surface of the unidirectional fiber fabric, wherein the belt width is no greater than the thread pitch of the threads; spirally winding tube body fibers to a required thickness; and performing curing and demolding. In the structure, a method combining the reinforcing fiber unidirectional fiber fabric and circumferential winding to form the internal threads of a composite material tube and the reasonable distribution of the reinforcing fibers on the thread tooth part in a load bearing direction reinforces the resin substrate, so the internal thread part has a strength high enough for threaded connection.

The invention relates to a composite modifier capable of improving overall performance of zinc-aluminum alloy, belonging to the technical field of zinc-aluminum alloy preparation. The composite modifier comprises the components in percentage by weight: 20-30% of Ni, 15-25% of Ti, 5-15% of Mn, 5-15% of Cr, 5-10% of Si, 5-10% of Ce, 5-10% of La, 1-6% of Y, 1-6% of Nb, 1-6% of V and the balance of aluminum. The modifier is blocky grey alloy, and has the particle size range of 0.5-40 mm and the melting point range of 800-1200 DEG C. By adopting the composite modifier, the overall performance of the zinc-aluminum alloy is obviously improved.

The invention relates to a manufacturing method of nodular cast iron for high-temperature parts of combustion engines, in particular to a manufacturing method of heat-resistant high-silicon-molybdenum nodular cast iron. The method comprises the following steps that chemical parameters, raw materials and weight percentage compositions are determined, wherein the nodular cast iron comprises, by weight, 30 percent-40 percent of pig iron, 20 percent-30 percent of scrap steel, 30 percent-40 percent of foundry returns, 1.5 percent-2.0 percent of silicon iron and 1 percent-1.2 percent of ferromolybdenum, and smelting, modification treatment, aging stress relieving technologies are performed. The method is unique, the creep resistance and endurance property of the material are improved, the intensity of the material is enhanced, and the service life of the material is prolonged; the influence on the graphite form by rare earth elements is relieved, the graphite roundness is improved, the fragmentation effect of graphite is relieved, the manufacturing cost and processing costs are reduced, and environmental friendliness and energy saving are facilitated.

The invention provides a low beryllium copper alloy mold material used for gravity and low pressure casting as well as a production process, comprising: adding Ni, Co and Ti elements on the basis of a low beryllium copper alloy, giving full play to advantages of the interaction of alloying elements, carrying out processing steps of cold deformation and time effect treatment after the hot forging, solution treatment and water quenching to a cast ingot, and obtaining the special low beryllium copper alloy mold material used in the gravity and low pressure casting industry and having high strength, good toughness and high heat conductivity, and products of the invention are equivalent to ASTM B534 C17500 materials and can fully replace imported goods.

The invention belongs to the field of metal materials and relates to a high-temperature wear-resistance high-strength aluminum alloy composite material for a piston and a preparation method thereof. According to the high-temperature wear-resistance high-strength aluminum alloy composite material for the piston and the preparation method thereof, the problem that a piston head is easy to crack due to the fact that the strength is insufficient under a high-temperature working condition. The material composed of a substrate and reinforcing phases; the substrate alloy comprises, by weight, 11.0-16.0% of silicon, 3.0-5.0% of nikel, 2.0-4.0% of cooper, 0.5-2.0% of magnesium, 0.5-1.5% titanium and the balance aluminum; and the reinforcing phases are Al2O3 particles generated through an in-situ reaction. The preparation method of the high-temperature wear-resistance high-strength aluminum alloy composite material for the piston comprises the following steps that raw materials are weighed by mass percentage; industry pure aluminum, crystalline-silicon, copper, nickel, magnesium and titanium are smelted at the temperature of 750-900 DEG C; the materials are cooled down to 540-600 DEG C at the speed of 20 DEG C / min, and (Al and B2O3) powder with the temperature being 200 DEG C is slowly added, ball-milled and preheated ; a piston blank is formed through high-pressure low-speed metal mold casting or squeezing casting; and the poured blank is subjected to T6 heat treatment. According to the high-temperature wear-resistance high-strength aluminum alloy composite material for the piston and the preparation method thereof, at the normal temperature and under normal pressure, production can be conducted through common aluminum alloy smelting equipment.

The invention relates to poly-citrate prepolymer / chitin nano crystal whisker slurry and a preparation method of same. The preparation method includes the following steps: 1) dispersing chitin nano crystal whiskers in a solvent to obtain a dispersant; 2) adding a poly-citrate prepolymer to obtain a mixture solution; 3) performing vacuum freeze drying; 4) adding a solvent with mixing to obtain the poly-citrate prepolymer / chitin nano crystal whisker slurry. During preparation, the solvent can not only cause self-emulsification of the poly-citrate prepolymer but also disperse the chitin nano crystal whiskers. The preparation method is simple. In the slurry, the chitin nano crystal whiskers are adhered to the surfaces of emulsion particles formed by the poly-citrate prepolymer through electrostatic attraction effect, thus assembling a three-dimensional crosslinked network structure. The slurry has characters of non-Newtonian fluids, such as shear thinning, and also shows stress yield duringa dynamic rheologic test. The slurry can be used for producing a porous tissue engineering scaffold as a 3D printing raw material and has great industrial production value.

The invention provides a cast steel and a preparing method and an application of the cast steel. The cast steel comprises the following components in a percent by mass: 0.12-0.22% of C, 0.3-0.6% of Si, 0.8-1.1% of Mn, smaller than or equal to 0.020% of P, smaller than or equal to 0.020% of S, 0.3-0.5% of Cr, 0.35-0.5% of Ni, 0.02-0.06% of Nb and the balance of Fe and unavoidable impurities. By reasonably arranging the adding quantity of alloy, the kinds and content of the added alloy are both few, and the components are easy to control. Therefore, the production cost of the cast steel is low,the content of the S and the P is controlled within the ranges, and the low-temperature toughness of the cast steel can be improved as much as possible. Through the cooperative use of the Cr and the Ni with the content, the cast steel has high impact toughness and can be used for manufacturing the related parts of goods wagons running in the low-temperature environments (-60DEG C) of severe cold regions.

The invention discloses a method for reducing additive manufacturing cracks of nickel-based superalloy and the nickel-based superalloy. The method comprises the steps that nickel-based superalloy powder serves as a raw material and is mixed with Re powder, and forming is conducted through the additive manufacturing technology; wherein the content of the Re powder is 0.5 to 2.0 mass percent. By adding the rare earth element Re, dendritic grains of the nickel-based high-temperature alloy subjected to heat treatment are finer, gamma'phase in the nickel-based alloy is precipitated and separated out, a matrix is strengthened, the mechanical performance of the alloy in a high-temperature state is promoted to be greatly improved, and therefore the nickel-based high-temperature alloy is widely applied to high-temperature severe places such as turbine engines.

The invention discloses a method for preparing an Al-Mg3Sb2 composite coating on the surface of magnesium alloy. After being mixed, Mg powder and Sb powder are ball-milled in a ball milling machine, so that Mg chemically reacts with Sb to form an Mg3Sb2 intermetallic compound, Mg3Sb2 powder and granulated Al powder are thermally sprayed to the surface of a magnesium alloy workpiece subjected to sandblasting treatment, and the Al-Mg3Sb2 composite coating is obtained; after the Al-Mg3Sb2 composite coating is heated, the coating is hot-pressed on a press machine. The Mg powder and the Sb powder have a solid-phase reaction in the ball milling process to generate the Mg3Sb2 intermetallic compound, Mg3Sb2 melting point is high, heat stability is good, dislocation movement can be effectively hindered, a substrate and a grain boundary are remarkably reinforced, and high-temperature mechanical properties and creep resistance of the workpiece are improved. Pores and layered structures in the thermally sprayed Al-Mg3Sb2 composite coating disappear in the hot press process because the composite coating plastically deforms and is compacted, compactness of the coating is remarkably improved, and the high-temperature mechanical properties and creep resistance are given full play to.

The invention relates to a bamboo-based / thermoplastic plastic nanocomposite material and manufacturing technology thereof. The technology comprises the following steps of: using a thermoplastic plastic as a matrix, and using bamboo fibers as an enhanced phase; modifying the bamboo fibers through nano particles so as to improve the compatibility with the matrix, the flux flow rate and the mold resistance of the composite material; and manufacturing the bamboo-based / thermoplastic plastic nanocomposite material through highly mixing, pelleting, extrusion molding, and other processing technology.The invention provides a bamboo-based / thermoplastic plastic nanocomposite material which has the advantages of high physical mechanical strength, high interface compatibility, high flux flow rate andhigh mold resistance. The bamboo processed wastes and wasted plastics are fully utilized, and the ecological environment is protected. The product can be applied to outdoor gardening landscape, outdoor furniture, outdoor floors, wall hanging boards, guardrails, trays, packaging cases and automotive interior decoration materials, and the like.

The invention relates to an Fe-Mn-Al-Ni-Nb shape memory alloy and a preparation method thereof. The Fe-Mn-Al-Ni-Nb shape memory alloy comprises 20%-43% of Mn, 13.50%-20% of Al, 7%-14% of Ni, 0.50%-2%of Nb, and the balance Fe. The preparation method comprises the steps: directly smelting industrial pure iron, electrolytic aluminum, electrolytic nickel and niobium iron in an induction furnace, andcompletely melting; adding ferromanganese, mixing alloy melt, and cooling to the room temperature along with the furnace to obtain a cast ingot; homogenizing the cast ingot in a vacuum furnace to obtain a treated cast ingot; and preserving heat of the cast ingot at 1250 DEG C for 30-60 min, then cooling to 900 DEG C for heat preservation for 30-60 min, repeatedly preserving heat at 1250 DEG C and900 DEG C for 2-10 cycles of heat treatment, and water quenching to the room temperature. According to the Fe-Mn-Al-Ni-Nb shape memory alloy and the preparation method thereof, the intracrystalline precipitation is promoted by the Nb, and a matrix is strengthened; the grain growth driving force is improved, and the as-cast sample has recoverable strain of more than 1.8% after heat treatment.

The invention provides a heat treatment composite process and die steel obtained according to the heat treatment composite process. The heat treatment composite process comprises the following steps of S1 tissue pretreatment: before shipping a die steel raw material from a factory, adopting a tissue pretreatment method which comprises the following steps of in a first stage, heating the die steelraw material in a vacuum environment to 550 DEG C and performing thermal insulation for 30 minutes, heating again to 850 DEG C and carrying out thermal insulation for 60 minutes, continuously heatingthe die steel raw material to 1150 DEG C and then performing thermal insulation for 60 minutes, introducing liquid nitrogen in the die steel raw material in the vacuum environment, and quenching the heated die steel raw material; and in a second stage: heating the die steel raw material obtained through the treatment in the previous procedure to 720 DEG C, then performing thermal insulation for 60minutes, and tempering to room temperature; S2 conventional quenching; and S3: placing the die steel raw material obtained through the treatment in the step 2 in a low temperature environment of -150to -200 DEG C for 15-24 hours for cryogenic treatment. By using the heat treatment process, the service life of die steel can be prolonged.

The invention relates to compound rare earth modification agent used for heat-resistant and anti-fatigue steel, and the agent belongs to addition agent applied to an alloy steel material. The invention is characterized in that the chemical components include the content (mass percentage ratio) that: RE occupies 15 to 17 percent (therein, Y occupies 50 to 71.1 percent of the mass of RE, and La+Ce+Pr+Nb+Sm+Eu+Gd+Tb+Dy+Ho+Er+Tm+Yb+Lu occupies 28.9 to 50 percent of the mass of RE), B occupies 0 to 10 percent, Nb occupies 0 to 17 percent, V occupies 0 to 6 percent, Ca occupies 0.5 to 15 percent, Ba occupies 0 to 15 percent and the residual is iron. The modification agent is block shaped grey alloy, the grain size scope is 0.5 to 50 mm, and the melting point scope is 1200 to 5000 DEG C. The modification agent is used to perform refining modification treatment to the material, and the anti-fatigue performance of the parts can be obviously enhanced, thereby lengthening the service life of the alloy suffering cold and heat alternating load function.

The invention discloses a high-strength high-hardness high-chromium cast iron plate hammer and a preparation method thereof. The high-strength high-hardness high-chromium cast iron plate hammer comprises the following chemical components by mass percent: 23.4-29.8% of Cr, 4.2-5.6% of Ni, 1.2-1.8% of Mo, 1.8-2.6% of Si, 3.2-4.0% of C, 0.25-0.45% of Mn, 1.4-2.2% of Zr, 1.0-1.5% of Ti, 0.3-0.7% of Ta, 0.5-1.0% of Mg, 0.4-0.6% of Cu, 0.3-0.5% of Al, 0.05-0.1% of Nd, 0.03-0.06% of Er, 0.03% or less of S, 0.06% or less of P and the balance Fe. The cast iron plate hammer prepared through the preparation method is good in comprehensive property, high in mechanical strength, hardness and abrasion resistance, low in cost, durable in use, and wide in market prospect, and is safe and reliable; and the production technology is simple and is high in efficiency.

The invention discloses a composite rare earth additive capable of improving the thermal-fatigue-resistant performance of a copper-aluminum based alloy, and belongs to the technical field of copper alloy. The additive is characterized by being composed of the following components in percentage by weight: 10 to 15% of Nd, 8 to 12% of Tb, 7 to 10% of V, 7 to 10% of Sb, 6 to 9% of Ce, 15 to 20% of La, Sc, Sm, Er, Yb, Lu, Gd, Nb, Ti, and Ba, and the balance being copper. The alterant is a block-shaped taupe alloy, the melting point is in a range of 800 to 1200 DEG C, and the addition amount of composite rare earth additive is in a range of 0.2 to 1.2%.

The invention discloses a creep-resistant and high-temperature-resistant rare earth aluminum alloy and a preparation method thereof, and mainly relates to the field of aluminum alloys. The aluminum alloy comprises the following components in percentage by mass: 5.0 to 8.0 percent of Zn, 2.5 to 3.5 percent of Mg, 2.0 to 3.0 percent of Hf, 0.3 to 0.6 percent of Gd, 0.2 to 0.5 percent of Zr and the balance of Al and impurities. The method has the beneficial effect that the problem of mutual inhibition of complex components in use in aluminum alloy processing in the prior art is solved.

The invention discloses a medical martensitic stainless steel material and a preparation method thereof. The medical martensitic stainless steel material is prepared from the following chemical components in percentage by weight: 0.2-0.4% of carbon (C), 15-18% of chromium (Cr), 1.5-4% of molybdenum (Mo), at most 0.05% of zirconium (Zr), at most 1.0% of silicon (Si), at most 1.0% of manganese (Mn), less than 0.03% of sulfur (S), less than 0.03% of phosphorus (P) and the balance of iron (Fe). The preparation method comprises the following steps: (1) smelting according to the chemical componentsin percentage by weight, and casting steel ingots; (2) heating the steel ingots to 1050-1100 DEG C to carry out hammer cogging or hammer forging; (3) reheating the steel billet to 1050-1100 DEG C, rolling, carrying out furnace cooling to 500 DEG C, and carrying out air cooling for annealing treatment; (4) machining to obtain product parts of medical appliances; and (5) heating the product parts of medical appliances to 950-1050 DEG C in a vacuum heat treatment furnace, and quenching by air cooling to obtain the finished product. The stainless steel material disclosed by the invention has the characteristics of no toxicity, high strength, corrosion resistance and no rusting, and is easy to process and is weldable, and the Rockwell hardness (HRC) is up to 45-60.

The invention discloses high-strength electric-conduction elastic Cu-Ti-Ni-Y alloy. The alloy is composed of the following components including, by mass, 92.55-95.5% of Cu, 0.01-0.15% of Y, 2.0-3.5% of Ti and 2.5-3.8% of Ni, wherein the sum of the mass percentages of the components is 100%. The invention further discloses a preparation method of the high-strength electric-conduction elastic Cu-Ti-Ni-Y alloy. The method comprises the following specific operating steps that copper blocks, titanium sponges, nickel blocks and yttrium blocks are subjected to smelting; solution treatment is performed; and aging treatment is performed. Compared with existing high-strength electric-conduction elastic copper alloy preparation, the preparation method disclosed by the invention is easy and feasible,and the obtained Cu-Ti-Ni-Y alloy is excellent in comprehensive performance. The hardness, the electric conductivity and the electric modulus of the alloy are 260-280 HV, 25-30% IACS and 140-160 GPa correspondingly.

The invention belongs to a sacrificial anode protection material of a reinforced concrete structure, in particular, a zinc alloy sacrificial anode material for a reinforced concrete structure in a chlorine salt erosion environment. In order to solve problems in a sacrificial anode material in the prior art, the following technical schemes of the invention are adopted, the sacrificial anode material of the invention comprises the following components in percentage by mass: 0.5% of Al; 0.1% of Cd; 0.18%-0.36% of La; 0.42%-0.84% of Ce; 0 to 0.1% of impurities; and the balance of Zn. The zinc alloy sacrificial anode material provided by the invention has the advantages of good activation performance, uniform corrosion, good corrosion resistance and long service life, and meets the use requirements of reinforced concrete. The zinc alloy sacrificial anode material is excellent in electrochemical performance, and the current efficiency reaches about 95%. The surface corrosion product of the zinc alloy sacrificial anode material is likely to shed.

The invention discloses an epoxy resin composite material for packaging a power electronic transformer and a preparation method of the composite material, and belongs to the field of power electronic device packaging insulating materials. The epoxy resin composite material is a micron diamond / nano aluminum oxide blended epoxy composite material and is prepared from epoxy resin, compound filler, a curing agent and an accelerant, and the compound filler is prepared from micron diamond and nano aluminum oxide. The preparation method comprises the following steps: adding the compound filler into the epoxy resin matrix, stirring, adding the curing agent accelerator according to the ratio, slowly injecting into a mold, putting the mold into a vacuum oven for defoaming, and finally performing curing to form the epoxy resin composite material. The preparation method is simple and suitable for industrial production, the prepared epoxy composite material is excellent in electrical insulation performance and heat conduction performance, and the problem that high-power power electronic transformers are insufficient in packaging stability and reliability can be effectively solved.

The invention relates to a method for forming the internal threads of a composite material, which comprises: circumferentially winding a nonwoven fabric impregnated with resin on the surface of a threaded part of a mandrel; spreading a resin substrate mixed with inorganic material crystal whiskers on the circumferentially wound nonwoven fabric layer, wherein the height of the resin is no lower than the top of the teeth of the threads of a mold; circumferentially paving a reinforcing unidirectional fiber fabric on the surface of the mandrel, wherein the fiber direction of the reinforcing unidirectional fiber fabric is consistent with that with the mandrel and the thickness of the reinforcing unidirectional fiber fabric is no greater than one third of the height of the teeth; winding reinforcing circumferentially wound fibers on the surface of the unidirectional fiber fabric, wherein the belt width is no greater than the thread pitch of the threads; spirally winding tube body fibers to a required thickness; and performing curing and demolding. In the structure, a method combining the reinforcing fiber unidirectional fiber fabric and circumferential winding to form the internal threads of a composite material tube and the reasonable distribution of the reinforcing fibers on the thread tooth part in a load bearing direction reinforces the resin substrate, so the internal thread part has a strength high enough for threaded connection.