35results about How to "High temperature tensile strength" patented technology

Copper-chromium-zirconium alloy is characterized by being prepared from the following raw materials in percent by weight: 0.2-1.2% of chromium, 0.05-0.2% of zirconium, 0.06-0.10% of magnesium, 0.05-0.5% of scandium and the balance of copper. The invention further provides a preparation method of the copper-chromium-zirconium alloy. The preparation method sequentially comprises the following steps:(1), proportionally preparing copper, chromium, zirconium, magnesium and scandium elements, performing vacuum smelting, and performing split casting to obtain a casting blank; (2), performing homogenizing treatment and hot extrusion on the casting blank to obtain a bar blank; (3), performing solid solution treatment to the bar blank; (4), performing cold deformation processing on the bar blank obtained after the solid solution treatment; (5), performing aging treatment to a material obtained after the cold deformation processing to obtain the needed copper-chromium-zirconium alloy. The copper-chromium-zirconium alloy has high tensile strength, high electrical conductivity and high elongation and has relatively high high-temperature tensile strength and excellent comprehensive performance.

Embodiments of the invention disclose a high-strength and high-conductivity copper alloy material, comprising by mass: 1.3%-1.5% of Cr, 0.4%-0.5% of Zr, 30% of Zn, and the balance Cu as well as inevitable impurities. The material can further include one or several of Zn, Fe, Mg and Ni. The material of the invention improves the high temperature softening resistance of products, and can prevent cracking caused by reduced material strength due to temperature rise. While ensuring high high-temperature tensile strength, yield strength and hardness, the material provided in the invention can simultaneously maintain high electroconductivity and heat conductivity.

The invention belongs to the field of welding and particularly relates to moderate-temperature Zr-based brazing filler metal special for Ti2AlNb-based alloy identical or different material brazing anda preparation method and a brazing process of the brazing filler metal. According to weight percentage, the brazing filler metal comprises 5%-30% of Fe, 1%-15% of Nb or 1%-20% of Cu, <=5% of oligoelements including one or two or more of Al, B, Co, Cr, Mn, Mg, Ni, Ag, and Zn, <=2% of microelements including one or two or more of Ti, Hf, V, Ta, Mo, W, Au, Si, Sn, Pd and Ga, and the balance of Zr elements and unavoidable impurity elements. The preparation method of the brazing filler metal comprises the steps that firstly, raw materials are weighed; secondly, mother alloy of the brazing filler metal is smelted; and thirdly, the smelted mother alloy is subjected to quenching melt-spinning, and then the brazing filler metal is obtained. The brazing filler metal is used for brazing according tothe brazing process of 960 DEG C to 1,030 DEG C and 0-120min. Compared with existing brazing filler metal, the prepared brazing filler metal has an appropriate melting point, excellent wettability and high-temperature mechanical properties, and brazing filler metal preparation and the brazing process are simple.

The invention discloses a diffusion welding method for a fixing supporting plate with a supporting plate head. The method specifically comprises the steps that linear cutting is carried out on a blank, grinding machining and other treatment are carried out on the surface of a to-be-welded surface, assembling positioning is carried out before welding, a compression amount supporting block is presetto ensure the compression amount, the corresponding welding parameters are controlled to carry out diffusion welding, the compression amount is checked after welding, welding seam metallographic inspection is carried out and other steps to complete the diffusion welding for the fixing supporting plate with the supporting plate head, wherein the welding percent of pass is larger than 95%. According to the method, the diffusion welding method is adopted to complete welding of the fixing supporting plate with the supporting plate head, the diffusion welding link for portions between layered plates of a conventional three-layer plate superplastic forming diffusion welding supporting plate is removed, hollowing of a strengthening rib triangular region of the inner cavity of the supporting plate is avoided, the faults of bulging and cracking of multi-layer plate diffusion connection fixing supporting plate are overcome, meanwhile, the supporting plate and the supporting plate head are of anintegral structure; and the diffusion welding process for the fixing supporting plate with the supporting plate head has the multiple advantages that the technological process is simple, the qualityis easy to control, the quality is stable, the consistency of inner molded surface and the outer molded surface of the fixing supporting plate is good, the size precision is high, and the like.

Copper-chromium-zirconium alloy is characterized by being prepared from the following raw materials in percent by weight: 0.2-1.2% of chromium, 0.05-0.2% of zirconium, 0.06-0.10% of magnesium, 0.05-0.5% of scandium and the balance of copper. The invention further provides a preparation method of the copper-chromium-zirconium alloy. The preparation method sequentially comprises the following steps:(1), proportionally preparing copper, chromium, zirconium, magnesium and scandium elements, performing vacuum smelting, and performing split casting to obtain a casting blank; (2), performing homogenizing treatment and hot extrusion on the casting blank to obtain a bar blank; (3), performing solid solution treatment to the bar blank; (4), performing cold deformation processing on the bar blank obtained after the solid solution treatment; (5), performing aging treatment to a material obtained after the cold deformation processing to obtain the needed copper-chromium-zirconium alloy. The copper-chromium-zirconium alloy has high tensile strength, high electrical conductivity and high elongation and has relatively high high-temperature tensile strength and excellent comprehensive performance.

The invention discloses a short-process bimetal brake drum casting method and belongs to the technical field of casting. The outer layer of the brake drum is formed in the mode that scraped car sheet steel blocks, Q235 scrap steel, high-carbon ferrochrome and nitrided ferromanganese serve as furnace charges and are smelted and continuously cast into a steel plate in a medium-frequency induction furnace and then welded and rolled, the inner layer is made of high-strength abrasion-resistant gray cast iron, and the inner layer and the inner layer are subjected to metallurgical bonding through centrifugal composite casting. The efficient utilization of the waste automobile sheet is realized, and the element yield is high. Compared with HT250 cast iron, the bimetal brake drum inner layer cast iron cast in a short process has the advantages of being high in high-temperature tensile strength and crack initiation and expansion resistance, long in service life, safe and reliable to use and the like. Compared with an HT250 cast iron brake drum, the service life of the brake drum is prolonged by more than 2.5 times, and the brake drum has good economic and social benefits in popularization and application.

The invention provides a method for preparing an aluminum-silicon alloy by using a high-iron-content ZL102 infiltrated aluminum alloy and the aluminum-silicon alloy. Technical problems that a recoveryrate of a process for recycling high-iron-content ZL102 is only 1%, but a yield of the high-iron-content ZL102 is 5%, the recovery rate is low, and economic losses are large in the prior art are solved. The method comprises the following steps of (1) adding manganese into the ZL102 infiltrated aluminum alloy with a high iron content and remelting to obtain a remelted ZL102 ingot with a refined iron phase; and (2) preparing the aluminum-silicon alloy. After the manganese is added into the ZL102 alloy with the high iron content and remelting is performed, and an iron phase structure is shortened and thinned so as to obtain the remelted ZL102 ingot with a refined iron phase; an adding amount can reach 5% of total weight of the aluminum-silicon alloy and can be completely counteracted with output, the recovery rate is greatly increased, and the economic losses are avoided.

The invention relates to a pipe material used for oilfield flexible oil gathering and transporting pipe transport layers. The pipe material comprises, by mass, 5-15 parts of an ethylene-vinyl alcohol copolymer, 10-30 parts of nylon, 20-60 parts of polyphenyl ether, 5-15 parts of a compatilizer and 4-8 parts of a flexibilizer, wherein the nylon is one or a mixture of PA6 and PA66, the compatilizer is polystyrene / polyphenyl ether grafted maleic anhydride, and the flexibilizer is a polystyrene / hydrogenated styrene-butadiene-styrene copolymer grafted maleic anhydride. The material has the advantages of high high-temperture tensile strength, good oil resistance, good flexibility and excellent processing performances, and can meet oil well outlet use requirements.

The invention belongs to the field of welding, in particular to a Ti 2 The invention relates to a medium-temperature Zr-based solder special for brazing of the same material or different materials of AlNb-based alloys, a preparation method thereof, and a brazing process. In terms of weight percentage, the composition and content of the solder are: Fe 5% to 30%, Nb 1% to 15% or Cu 1% to 20%, choose one of the two, and a small amount of elements Al, B, Co, Cr , one or more of Mn, Mg, Ni, Ag and Zn≤5%, one or more of trace elements Ti, Hf, V, Ta, Mo, W, Au, Si, Sn, Pd, Ga≤ 2%, the rest is Zr element and unavoidable impurity elements. The preparation method of brazing material: 1. Weighing the raw materials; 2. Melting the master alloy of the brazing material; The brazing material of the present invention is brazed according to the brazing process of 960 DEG C to 1030 DEG C and 0 to 120 minutes. Compared with the existing solder, the brazing filler metal prepared by the invention has suitable melting point, excellent wettability and high-temperature mechanical properties, and the brazing filler metal preparation and brazing process are simple.

The invention discloses high-toughness austenite boiler steel belonging to the technical field of austenite boiler steel. The boiler steel comprises the following chemical constituents: 0.025-0.038 wt% of C, 0.20-0.40 wt% of Si, less than or equal to 2.00 wt% of Mn, less than or equal to 0.045 wt% of P, less than 0.03 wt% of S, 20-21.5 wt% of Ni, 0.15-0.20 wt% of N, 0.30-0.40 wt% of Nb, 0.0010-0.050 wt% of element B, 0.020-0.15 wt% of element V and the balance of Fe. The invention has the advantages that when the high-toughness austenite boiler steel is compared with S31042 steel, two alloy elements of B and V are added, and the ingredient range of C, Nb, N, Si, Cr, Ni and other elements is adjusted, so that the high-toughness austenite boiler steel has the characteristics of reasonable constituent design and high toughness. After long aging at 700 DEG C, compared with the S31042 steel subject to same heat treatment, the high-toughness austenite boiler steel has higher room-temperature impact toughness, and tensile strength at high temperature of 700 DEG C is comparative or slightly higher.

The invention discloses a multielement rare-earth magnesium alloy and a preparation method thereof. The multielement rare-earth magnesium alloy comprises the following components in percentage by mass: 2%-6% of Gd, 2%-3% of Y, 1%-2.5% of Nd, 0.5-1.5% of Sm, 0.4%-0.8% of Sb, less than 0.02% of total impurity elements, namely Si, Fe, Cu and Ni, and the balance of Mg. The multielement rare-earth magnesium alloy disclosed by the invention has the composition of Mg-Gd-Y-Nd-Sm-Sb, and has high high-temperature tensile strength and stable high-temperature performance as well as an abnormal temperature effect in the range from a room temperature to 250 DEG C. Compared with a commercial heat-resisting magnesium alloy WE54, the multielement rare-earth magnesium alloy has higher high-temperature tensile strength and operating temperature and has wide application prospect in fields such as aerospace, automobile industries and weaponry.

The invention discloses a method for preparing a brake servo piston material. The method comprises the steps of: preparing raw materials such as aluminum, silicon, strontium, iron, chromium, manganese, nickel, carbon, magnesium, titanium carbide, copper and graphene; designing a mixer for mixing the raw materials; carrying out ball milling treatment on the raw materials, carrying out screening, and mixing the raw materials by using the mixer; pouring the mixed raw materials into a molding mold, and carrying out high-temperature smelting and cooling discharging to obtain a piston material roughblank; and carrying out micro forging on the piston material rough blank by adopting high-frequency vibration impact force to obtain a piston material. The high-temperature tensile strength of the piston material prepared through the method reaches 98.61 MPa, and the structural strength is obviously improved; through optimization design of the structure of the mixer for mixing the raw materials,the condition that the raw materials of multiple alloying elements can be evenly mixed can be ensured, and the internal structure of the piston material is compact, uniform and stable; and micro forging is carried out on the piston material rough blank by adopting the high-frequency vibration impact force, so that the fatigue strength of the piston material can be improved.

The invention discloses a nano- and sub-micron aluminum oxide hybrid reinforced copper matrix composite material and a preparation method thereof. The metallic copper contains nano-alumina particles with a size and a volume fraction of 10-50 nm and 0.5-2.5% respectively, and the size and The volume fractions are respectively 0.1-0.9 μm and 5-10% of submicron alumina particles. The preparation method is to mix Cu-0.5wt% Al alloy powder and CuO powder, oxidize it into a prefabricated block after vacuum heating, and preheat it. After mixing the Al powder and CuO powder, they are added to the copper liquid to react in situ to form submicron alumina particles. Under vacuum and pressure, the copper liquid is infiltrated into the porous prefabricated block and formed after solidification. The strength, electrical conductivity, plasticity and other comprehensive properties of the material of the present invention are superior to traditional single-size reinforced materials, realizing near-net shape of complex shapes and large-sized parts, low cost, improved comprehensive properties of materials, and improved efficiency.

The invention provides a method for preparing aluminum-silicon alloy and aluminum-silicon alloy by using high-iron-content ZL102 infiltrated aluminum alloy, which solves the process of recovering high-iron-content ZL102 in the prior art, and the recovery rate is only 1%. Iron amount ZL102 output rate has 5%, and recovery rate is low, and the technical problem of economic loss is bigger. The method comprises the following steps: (1) remelting ZL102 infiltrated aluminum alloy with high iron content by adding manganese to obtain remelted ZL102 ingot with refined iron phase; (2) preparing aluminum-silicon alloy. In the present invention, after the ZL102 alloy with high iron content is remelted with manganese, the iron phase structure becomes shorter and thinner, and a remelted ZL102 ingot with a refined iron phase is obtained; the addition amount can reach 5% of the total weight of the aluminum-silicon alloy, which can completely And output offset, greatly improving the recovery rate, avoiding economic losses.

The invention discloses a strontium-containing composite piston material. The strontium-containing composite piston material comprises, by weight part, 11-15 parts of silicon powder, 0.5-0.8 part of magnesium powder, 0.05-0.09 part of titanium powder, 0.2-0.7 part of strontium powder, 8-12 parts of silicon carbide powder, 5-7 parts of molybdenum disulfide, 0.3-0.6 part of hafnium powder and 75-85parts of aluminum powder. The invention further discloses a preparation method of the strontium-containing composite piston material. The preparation method comprises the steps of 1, weighing raw materials; 2, conducting ball milling, sieving and mixing on the silicon powder, the magnesium powder, the titanium powder, the strontium powder, the hafnium powder and the aluminum powder; 3, conductingheating and heat preservation on the silicon carbide powder, and making the silicon carbide powder react with oxygen completely, so that silicon dioxide is formed on a surface layer; and 4, conductingheating, degassing and heat preservation on the mixed raw materials, then lowering the temperature, subsequently adding the molybdenum disulfide and silicon carbide, and conducting stirring. According to the strontium-containing composite piston material and the preparation method thereof, alloy elements which produce great influence on the high temperature performance and the wear resistance areadded according to certain ratios, and the mixing ratios are adjusted, so that the high temperature strength and wear resistance of the material are improved.

Embodiments of the invention disclose a high-strength and high-conductivity copper alloy material, comprising by mass: 1.3%-1.5% of Cr, 0.4%-0.5% of Zr, 30% of Zn, and the balance Cu as well as inevitable impurities. The material can further include one or several of Zn, Fe, Mg and Ni. The material of the invention improves the high temperature softening resistance of products, and can prevent cracking caused by reduced material strength due to temperature rise. While ensuring high high-temperature tensile strength, yield strength and hardness, the material provided in the invention can simultaneously maintain high electroconductivity and heat conductivity.

The invention discloses a method used for increasing hear resistance of ketone-anhydride type polyimide retainer tube blank, and belongs to the field of engineering plastic retainer technology. The method comprises steps of preparation of a retainer tube blank material, drying, mixing, hot press molding, and annealing treatment. According to the method, the retainer tube blank material is subjected to drying and mixing, and then is subjected to hot press molding using a programmed type thermocompressor so as to obtain ketone-anhydride type polyimide composite retainer tube blank; and then the obtained ketone-anhydride type polyimide composite retainer tube blank is subjected to annealing treatment. The obtained ketone-anhydride type polyimide composite retainer tube blank is light, and high temperature tensile strength, tribological properties, and heat resistance are improved effectively.

The invention discloses a piston of an aluminum-based composite material for a heavy-duty diesel engine and a preparation method thereof. The piston includes a piston body, and the piston body is made of an aluminum-based composite material through a gravity casting method; the aluminum-based composite material It is made by mass percentage of components: Si 13.5~14.5%, Cu 6.5~7%, Ni 4.5~5%, Mg 1.3~1.5%, Fe 0.1~0.4%, Mn 0.1~0.4%, Zr 0.01~ 0.04%, V 0.01~0.04%, TiB 2 Particles 1 to 15%, the balance is Al. The aluminum-based composite material piston prepared by the invention can be designed with an inlaid ring and a salt core internal cooling oil passage, has the characteristics of good high temperature resistance and good dimensional stability, and is suitable for various heavy-duty diesel engines.

The invention discloses hot work die steel and a preparation method thereof. The hot work die steel is composed of the following constituent elements including, by weight, 0.396%-0.397% of carbon, 0.975%-1.03% of silicon, 0. 427%-0.514% of manganese, 1.55%-1.59% of molybdenum, 4.94%-5.10% of chromium, 0.984%-1.04% of vanadium, 0.044%-0.127% of titanium and the balance iron and inevitable impurities. According to the hot work die steel, the Ti element is added on the basis of H13 steel compositions; on one hand, the effects of controlling the grain size, preventing excessive growth of grains and increasing precipitation strengthening and fine grain strengthening are achieved, and the strength and hardness of the steel are improved; and on the other hand, the titanium reacts with the carbonto generate titanium carbide, the advantages of high hardness and good thermal stability are achieved, the effect of precipitation strengthening is achieved, and micro Ti alloying is formed. The roomtemperature Rockwell hardness, room temperature tensile strength, room temperature tensile section shrinkage, the high-temperature tensile section shrinkage rate and the high-temperature tensile strength of the hot work die steel are significantly improved, and the comprehensive mechanical properties are obviously enhanced.