30results about How to "Equivalent hardness" patented technology

The invention discloses a high-performance powder metallurgy pressed and sintered semi-high-speed steel and a preparation method thereof. The invention uses carbonyl iron powder and carbide powder as raw materials, and realizes the preparation of high-performance powder metallurgy semi-high-speed steel through processes such as ball milling, cold pressing, thermal degreasing and vacuum sintering. The prepared semi-high-speed steel has uniform chemical composition, fine grains, and overall dispersed distribution of carbides, which avoids the problems of composition segregation and coarse carbides in the traditional casting method, and significantly improves the strength and toughness of the material. The invention has the advantages of simple technological process, low production cost, easy control of components and the like. Compared with the semi-high-speed steel prepared by melting and casting, the provided semi-high-speed steel has significantly improved bending strength and impact toughness under the same density.

The invention provides a high-performance dynamic vulcanized thermoplastic elastomer and a preparation method thereof, which is made of the following raw materials in parts by mass: 100 parts of halogenated butyl rubber; 30-70 parts of nylon; 5-30 parts of compatibilizer; 5-20 parts of plasticizer; 0-20 parts of filler; 0.1-5 parts of antioxidant; 1-5 parts of vulcanization system; 1-5 parts of antioxidant; the filler is modified nanoclay; the preparation method includes the following Steps: (1) Prepare masterbatch by mixing halogenated butyl rubber with anti-aging agent, plasticizer, partial vulcanization system and filler (2) Put the masterbatch in an oven for pre-vulcanization to obtain pre-vulcanized masterbatch (3) adding pre-vulcanized masterbatch, nylon, compatibilizer and antioxidant into the internal mixer and mixing uniformly; (4) adding the remaining vulcanization system to the internal mixer to prepare dynamically vulcanized thermoplastic elastomers. The dynamically vulcanized thermoplastic elastomer prepared by the invention has good mechanical properties, high air tightness and wide application range.

The invention belongs to the field of food processing, and relates to low-glycemic-index grain rice and a production method thereof. The glycemic index of the low-glycemic-index grain rice is 50 or below. Grains are rice or coix seeds or corns or millets or red rice or black rice or a combination thereof. The production method of the low-glycemic-index grain rice comprises the steps that the grains are soaked with water and drained, cooking liquor is added for curing, then, the cooking liquor is filtered away, and then aging and drying are performed. The low-glycemic-index grain rice contains the effective nutrients of full grains, and cannot remarkably increase the body glycemic index after a user eats the rice.

The invention provides a support structure. The support structure comprises a support rod and a sealing bowl arranged at one end of the support rod. The sealing bowl and the support rod are of a split structure. The support rod and the sealing bowl are each made of an aluminum material. The sealing bowl is mounted outside the end of the support rod in a sleeving manner and is in interference fit with the support rod. A conical plane is arranged at the sealing position outside the sealing bowl. The invention further provides a moving coil type fuel gas proportional valve. The moving coil type fuel gas proportional valve comprises a proportional valve body, a support assembly which is arranged in the proportional valve body in a sliding manner and can be sealed on a valve port of the proportional valve body, a moving coil assembly for driving the support assembly to move and an induction membrane for isolating the support assembly from the moving coil assembly. The support assembly is the support structure. The support structure and the moving coil type fuel gas proportional valve have the beneficial effects that the structure is light, control is easy, machining is quite convenient, strength and sealing performance are good, and the service life is long.

The invention relates to steel pipe annealing equipment and a steel pipe annealing technology. The steel pipe annealing equipment comprises the following technological processes: A. conveying a steel pipe to a feeding roller table through an alignment device, and conveying at the speed of 16-27m / h; B. enabling the steep pipe to enter a thermal treatment furnace via an inlet sealing box and carrying out closed heat treatment on the steel pipe, and continuing to move the steel pipe forwards in the thermal treatment furnace at the speed of 16-27m / h, wherein the steel pipe orderly passes through a first heating area, a second heating area, a third heating area, a fourth heating area and a heat preservation area inside the thermal treatment furnace; the heating temperatures of the first heating area, the second heating area, the third heating area and the fourth heating area are orderly increased, and the thermal treatment furnace is filled with protective gas in the closed thermal treatment process; C. slowly cooling the steel pipe by a cooling box adopting circulating cooling water to cool after the steel pipe is discharged from the thermal treatment furnace; and D. enabling the steel pipe to enter an aggregate area through an outlet sealing box to finish the overall process after the steel pipe is discharged from the cooling box. By adopting the technology, the inner stress of the material after pipe welding can be removed, the steel pipe is uniform in hardness, high in tensile strength and high in ductility, the yield strength is reduced, and the steel pipe is flexible.

The invention discloses a preparation method of a carbon nanotube enhanced copper-based composite material. The preparation method comprises the following steps: uniformly adding MWCNTs (Multi-walledCarbon Nanotubes) between copper foils; carrying out an SPS (Spark Plasma Sintering) and cold rolling technology to obtain a laminar MWCNTs / Cu composite material thin belt. The relative density of anobtained MWCNTs / Cu composite material is 94.3 to 98.6 percent. Compared with a traditional powder SPS MWCNTs / Cu composite material, the resistivity is reduced by 10 percent to 16 percent and the yieldstrength is equivalent.

The invention discloses a metal-matrix composite ceramic liner plate. Zirconia aluminum oxide, high chromium iron powder and iron powder are electrically smelted and injected into a metal-matrix ceramic reinforcement with a plurality of communicated plug holes to form the metal-matrix composite ceramic liner plate; the upper and lower end faces of the metal-matrix ceramic reinforcement are provided with communicated plug holes, and four side faces of the metal-matrix ceramic reinforcement are provided with communicated grooves; after different reinforcements are spliced, grooves on edges of two adjacent reinforcements form complete plug holes, a metal liquid is poured into the plug holes and can infiltrate among ceramic particles of the reinforcements through the plug holes and uniformly coat the ceramic particles, so that a ceramic phase and a metal phase are uniformly distributed. Therefore, the toughness and wear resistance of the finished ceramic products are enhanced, and the thermal shock resistance of the finished ceramic products is improved.

The invention belongs to the field of preparation of special composite coatings, and in particular relates to a composite coating of high-entropy alloy composited with large-grain tungsten carbide and its preparation method and application. The composite coating is composed of high-entropy alloy and tungsten carbide, and the tungsten carbide contains large particle tungsten carbide; the particle size of the large particle tungsten carbide is 75-150 microns. The preparation method is as follows: mixing high-entropy alloy powder and large-grain tungsten carbide according to a set ratio; preparing high-entropy alloy / large-grain tungsten carbide by laser cladding and rapid cooling. By adopting the preparation process of the present invention, the high-entropy alloy / large-grain tungsten carbide composite coating is prepared while protecting the matrix and the large-grain tungsten carbide from damage, so as to realize the uniform distribution of the large-grain tungsten carbide particles inside the composite coating, And it is suitable for large tungsten carbide particles of various qualities and various types of laser cladding equipment.

The invention provides a high γ-aminobutyric acid high dietary fiber noodle, which has the effects of improving intelligence and improving intestinal function, and the noodle hardness, elasticity and cohesion are comparable to those of ordinary dried noodles on the market. In addition, the present invention also provides a preparation method thereof, which can improve the taste of noodles through ultra-micronization; can improve γ-aminobutyric acid and water-soluble diet through germination and endogenous enzyme transformation, as well as the combined action of ultra-micronization and enzymatic hydrolysis The content and utilization of fiber can reduce the content of anti-nutritional factors and improve the efficacy; the use of sprouted puree to make noodles can improve the toughness and chewing performance of the noodles, the taste and flavor are good, and the nutrient digestion and absorption rate of the noodles can be improved.

The invention belongs to the technical field of preparation and characterization of alloy materials, and discloses a method for preparing a micron-sized nickel-based superalloy powder transmission electron microscope film sample. The method is as follows: adding nickel-based alloy powder into the electroplating solution and stirring to obtain a suspension; then placing the cathode nickel sheet and the anode nickel sheet in the suspension to obtain uniform nickel-based alloy powder on the cathode nickel sheet; The power supply is electroplated, the nickel-plated layer embeds the nickel-based alloy powder, and then it is mechanically thinned and punched into a disc with a diameter of 3mm, and then ground into a wedge-shaped sample in the thickness direction; it is attached to the opening of the open copper ring , the thin end of the wedge is close to the center of the opening of the copper ring, and then the open copper ring with the sample attached is placed in the ion thinning instrument for ion thinning to obtain a thin film sample area that can be observed by the transmission electron microscope. The method of the invention has the advantages of short time consumption, good coating quality and good embedding effect of nickel-based superalloy powder.