34results about How to "Reduce deformation cracking" patented technology

The invention discloses a high-strength high-elasticity copper-nickel-manganese alloy and a preparing method thereof, and belongs to the technical field of special material preparing. Vacuum smeltingis adopted, gas and low-smelting impurities can be sufficiently exhausted, a billet structure can be purified, an ingot microstructure is subjected to homogenization treatment and then subjected to hot rolling, deforming cracking caused by nonuniform components can be reduced, and meanwhile through hot rolling, coarse grains in the alloy can be broken; through large deforming cold rolling, grainsin the alloy can be further broken, the fiber deformed microstructure is formed, the solid-solution treatment is used for enabling the alloy structure to be subjected to perfect recrystallization, meanwhile, solute atoms are re-dissolved into a base body, a supersaturation solid solution is formed, through aging treatment, the solute atoms are separated out in a form of a second phase, temperatureand time of aging are controlled, the separated-out second phase is fine and evenly distributed in the base body, and the alloy strength can be reinforced.

The invention discloses a cement-base colored microsurface, belonging to the technical field of road engineering. The microsurface pavement comprises a cement-base layer, wherein the cement-base layer comprises the following components in parts by mass: 100 parts of cement, 150-170 parts of colored quartz sand, 50 parts of water, 7 parts of waterproofing agent and 10 parts of pigment; and the cement-base layer also comprises 0.1 vol% of polyvinyl alcohol fiber and a right amount of modifier. The modifier is composed of a water-based epoxy resin (the mass ratio of the water-based epoxy resin to the cement is (8-12):100) and a curing agent (the mass ratio of the curing agent to the water-based epoxy resin is 1.3:1), or hydroxy cellulose (the mass ratio of the hydroxy cellulose to the water is 3:100), or a water-based organic silicon resin (the mass ratio of the water-based organic silicon resin to the cement is 2.5:100). The color of the colored quartz sand has the same color system as the color of the pigment. The invention also discloses a construction method of the cement-base colored microsurface. The cement-base colored microsurface has the advantages of higher water resistance, higher crack resistance, higher wear resistance, higher color distinction degree and high color durability, and is easy for construction.

The invention relates to a non-quenching high-toughness cold-working die steel belonging to the technical field of metallurgical manufacture. The novel cold-working die steel is developed by optimizing and creating a product component formula, adding alloy elements, rolled and cold thinned texture and adopting the processes of remelting and fining electroslag in an electric furnace, forging many times in a great forging proportion and special heat treatment. The manufacture process comprises the following flows: selecting a chemical component range; drawing an ingredient scheme according to the chemical component range; melting at an intermediate frequency; remelting (refining) the electroslag; annealing; discharging; extending hydrogen; forging; normalizing; tempering; mechanically processing; and detecting. The important manufacture process comprises the steps: (1) refining; (2) forging; (3) extending hydrogen; and (4) normalizing; and tempering so as to obtain non-quenching high-toughness cold-working die steel. The invention has reasonable chemical component proportion, low manufacture cost, good alloying effect, great forging transformer ratio, favorable density of metal structure and high toughness performance index. Various performance indexes of the product reach or exceed the levels of similar international and national products.

The invention provides a high-strength TBM center knife box and a preparation method thereof, comprising an outer knife box and an inner knife box, the outer knife box is made of structural steel material, the inner knife box is made of low-carbon medium alloy structural steel material, and the inner and outer knife boxes are welded combined in a way. The inner knife box of the present invention adopts quenching and tempering and hardening treatment, and at the same time adopts the form of welding the inner and outer knife boxes to connect, the inner and outer knife boxes are formed by forging process, and the inner knife box is made of low-carbon medium alloy structural steel to reduce the welding stress concentration of the inner and outer knife boxes. Cracking and deformation; the surface hardening treatment of the inner knife box can improve the strength and fatigue performance of the bearing part, and the stress relief annealing treatment of the inner and outer knife boxes can effectively reduce the distribution of residual stress in the forging process and the welding stress concentration point of the inner and outer knife boxes.

The invention discloses a wear-resistant high-performance ceramic roller rod and a preparation method thereof. The invention uses fused mullite and fused alumina to replace ordinary mullite and alumina by adjusting the weight of raw materials, so that the final obtained The advanced ceramic roller has excellent wear resistance and high temperature resistance. Adjusting and controlling the addition of inorganic fillers not only improves the strength of the ceramic roller, but also further enhances the thermal spalling resistance of the ceramic roller. The invention also discloses a preparation method of a wear-resistant high-performance ceramic roller rod, which adopts a spiral extrusion molding process, continuous extrusion molding, high production efficiency, high compactness and high mechanical strength of the ceramic roller rod, and reduces the production cost of the ceramic roller rod. The deformation and cracking of the ceramic roller improves the performance of the ceramic roller.

The invention discloses a high-strength anti-seepage and anti-freeze concrete and a preparation method thereof. The high-strength anti-seepage and anti-freeze concrete includes the following raw materials: cement, water, sand, gravel, fly ash, antifreeze, anti-rust and anti-corrosion waterproofing agent, waste concrete particles, waste rubber particles; the antifreeze includes the following components in parts by weight: 3.4-6.8 parts of modified coal gangue, 1.2-2.0 parts of rice husk ash, 1.5-3 parts of vinyl acetate-ethylene copolymer latex powder, 0.8-1.6 parts of silica fume, 2.4-3.8 parts of polypropylene mesh fiber, 0.8-3 parts 1.6 parts seaweed extract, 0.9‑1.8 parts urea, 1.4‑2.2 parts calcium nitrite, 10‑20 parts water. The high-strength anti-seepage and anti-freeze concrete of the invention has the advantages of effectively utilizing waste materials, having strong anti-freezing and thawing properties and mechanical properties, being able to reduce freezing and thawing diseases of concrete in cold regions, and being able to purify automobile tail gas.

The invention discloses a method for processing wood strips and boards, which comprises the following steps: 1) balancing the moisture content of the wood, degreasing and drying, and leaving the kiln from the drying kiln when the moisture content of the wood is not more than 11%, and then stacking The wood is filled and stored for about 15 days, and then balanced in a balancing kiln for 3-4 days to make the moisture of the wood uniform, and the moisture content does not exceed 13%, and then the balanced wood is stored for 15-20 days; 2) Material selection: choose moisture Uniform and tightly structured wood; 3) Slicing: Carry out horizontal or vertical cutting, and cut the selected wood as a whole to make 6cm wide wooden strips; 4) Bonding and splicing: the planed wooden strips are still Splicing and bonding into the required size according to the original position; 5) compacting and air-drying. As an improvement, step 4) reserves a process contraction joint at intervals for the planks after bonding and splicing. Compared with the prior art, the present invention cuts the selected wooden strips into wooden strips with a width of about 6 cm, and breaks the wooden bars therein, so that the thermal expansion and contraction of the finished product is reduced, and the quality of the finished wooden strips and boards is improved. Stable and not prone to deformation and cracking.

The invention discloses a high-strength high-elasticity niobium-containing copper alloy and a preparation method thereof, and belongs to the technical field of copper alloy preparation. According to the high-strength high-elasticity niobium-containing copper alloy, the Vickers hardness is higher than or equal to 420 HV, the tensile strength is larger than or equal to 1300 MPa, the elongation is larger than or equal to 7.5%, the alloy grains are uniform and fine, the ultra-high strength, plasticity and elastic modulus are achieved, and the copper alloy and the preparation method can be widely used in the fields of high and new technologies such as automobiles, rail transits, electronic and electrical and aerospace; The preparation method of the high-strength high-elasticity niobium-containing copper alloy can effectively refine the grain size of the alloy, control the size and distribution of a precipitation second phase, strengthen the strength and elasticity of the alloy and improve the plasticity of the alloy.

This application relates to a side keel connection process, which includes the following steps: S1: a guide device is installed on the side keel, and a first sealing tape is pasted on the side keel through the guide device; S2: the pasting material on the other side of the first sealing tape is The connection plate of polyethylene foam cotton; S3: the side keel is fixedly connected with the wall through the connection plate; S4: install gypsum board under the side keel. This application has the effect of reducing the adverse effects of the vibration frequency of different materials or the normal settlement of the house on the house, and reducing the possible effect of cracking and deformation of the gypsum board.

A kind of optical curing of calcium silicate / β‑ phosphate three calcium ceramic cream and porous stent preparation methods. Ceramic cream is based on quality ratio, including ceramic powder 78‑83 %, premixed 14‑16 %, dispersant 1.0‑2.0%, 0.5 光1.0 % of the light -induced agent, 1.0‑2.0 % compatible agent and 0.5‑1.0 % flowing agent; the preparation method is optimized by optimizing the ingredients of calcium calcium silicate / β‑ phosphate cream, and rationally selected optical curing to curing curingFormed printing parameters, optimizing the design of porous bracket structure, and reasonable design subsequent sintering process, which improves the printing accuracy of photocalized calcium silicate / β‑ phosphate, reducing the cracking and deformation of the sintering process, and obtaining high accuracy, obtaining high accuracy, and obtaining high accuracy, and obtaining high accuracy and accuracy.Cracking and deformed calcium silicate / β -phosphate trigly -porous bracket.

The invention discloses a method for sintering a radially-oriented sintering samarium cobalt integrated magnetic ring and aims to solve the problems that in the conventional sintering method, the radially-oriented sintering samarium cobalt integrated magnetic ring is susceptible to cracking and has low finished product rate and the production cost is greatly increased. According to the method, the pressed radially-oriented sintering samarium cobalt integrated magnetic ring is placed into a novel vacuum sintering furnace, and heating and heat preservation are performed by the heating method of combining the traditional resistance heating with the microwave heating, so that the temperature of the magnetic ring is increased uniformly, thermal stress generated by that the magnetic ring is heated non-uniformly due to heating of a traditional resistance is reduced, the integrity of the magnetic ring is maintained, the finished product rate is increased, and the cost is reduced.