348results about How to "Improve high temperature mechanical properties" patented technology

A high-temp self-lubricating non-Pb Cu-base composition has a chemical formula: Ni+C+Sn+Zn+MX+Fe+Cu, where MX is chosen from BN, Si3N4, SiC, Al2O3, TiN, TiC and Cr3 C2 and C is graphite and carbon fibres. It has anti-oxidizing, anti-corrosion and high-temp anti-wear characteristics.

The invention discloses directional TiAl-based alloy and a preparation method thereof. According to the atomic percentage, TiAl alloy components are expressed as Ti-(40-50)Al-aNb-bCr-cMo-dV-eMn, wherein in the formula, a, b, c, d, e are atomic percentages, a+b+c+d+e is less than or equal to 10, and the balance is Ti. The method for preparing the columnar crystal TiAl-based alloy includes the following steps that mother alloy is smelted through vacuum induction suspension, and a mother alloy cast rod is prepared through vacuum suction casting; an optical floating zone crystal growth system is adopted, argon is used as protection gas, the flow speed is 3-3.6L/min, the width of a regional heating zone is 6-6.7mm, heat treatment is performed on the TiAl-based alloy cast rod, the heating temperature is controlled to be 1250-1350 DEG C, the drawing speed is in the range of 3-13 micrometers per second, and the columnar crystal TiAl-based alloy is prepared. Compared with a directional solidification technology, in the preparation method, peritectic reaction is omitted, and therefore peritectic segregation is avoided; the problem that refractory metal and alloy, such as tungsten and molybdenum, with direction tissue cannot be prepared through the direction solidification technology can also be solved.

The invention discloses high-strength nodular cast iron QT900-6 which consists of the following elements in percentage by weight: 3.2-3.7% of C, 2.4-2.8% of Si, less than or equal to 0.2% of Mn, less than or equal to 0.03% of P, 0.005-0.02% of S, 0.8-1.4% of Cu and the balance of Fe and unavoidable trace elements. The high-strength nodular cast iron QT900-6 has high compressive strength, high yield strength and excellent mechanical property.

The invention discloses a method for manufacturing high-dispersion ultrafine molybdenum-based powder, and belongs to the technical field of rare-earth refractory metal materials. A technological process includes acquiring precursor powder comprising molybdenum oxide, rare-earth oxide (one or two of Y<2>O<3> and La<2>O<3>) or copper oxide which are mixed uniformly by low-temperature combustion synthesis; and reducing the precursor powder in flowing hydrogen atmosphere. The molybdenum oxide and the copper oxide which are easy to reduce are reduced into metal molybdenum and copper, rare-earth oxide particles which cannot be reduced remain, and accordingly high-dispersion ultrafine Mo and rare-earth oxide powder or high-dispersion ultrafine Mo-Cu composite powder is obtained. The weight percent of the rare-earth oxide in the Mo and rare-earth oxide powder ranges from 0.5% to 30%, and the weight percent of the Cu in the Mo-Cu composite powder ranges from 5% to 40%. The method has the advantages that the powder particles are small in diameter and high in surface activity, a dispersion path in a sintering procedure is shortened, and the method is beneficial to acquiring high-density ultrafine-grain/nano-grain molybdenum-based alloy with uniform tissue distribution.

A method of continuously founding the titanium alloy to be close to an single crystal ingot with a magnetic field belongs to a method of making the titanium alloy to be close to the single crystal ingot. The method solves the problem that the container material is easy to pollute the alloy and thus affect the physical and mechanical performances of the single crystal alloy during preparation of single crystal in the current directional solidification methods. The procedures of the invention are as follows: 1. vacuum pumping is conducted in a furnace (4), and then argon is re-charged. 2. induction coils (3) are arranged out of a water-cooled copper crucible (2), and spread on the outer surface of the water-cooled copper crucible (2). 3. a material rod (3) enters into the induction coils (3), the titanium alloy charge enters into the cavity of the water-cooled copper crucible (2), and the diameter of the upper part of the charge is small. 4. After heating, pulling is conducted, the feeding speed must strictly match with the pulling action; a rod enters into a crystallizer (9); the material rod forms close single crystal after pulling, and obtains the single crystal ingot after processing the outer layer. The invention realizes high-grade, high-efficiency, safety, special and low-cost single crystal preparation method for the titanium alloy material.

The invention belongs to a new high performance and high polymer material synthesis field, in particular to a method for preparing a novel high glass-transition temperature crystal type polyethylene-ketone-ketone resin material in a such way that a monomer solutions of diphenyl ether and aromatic acyl chloride are dropwise added in a system, and a Friedel-Crafts low temperature solution electrophilic substitution polymerization is carried out. The viscosity of the resin materials synthesized by the method can be precisely controlled within 0.50-1.10+/-0.10 dL/g, the glass-transition temperature can be controlled between 168 DEG C and 175 DEG C, and the melting temperature can be controlled between 310 DEG C and 360 DEG C. Compared with the FC of the same kind of already commercialized products, under the condition that the materials maintain excellent melting processing performance, the polymer has the glass-transition temperature 15 DEG C higher than that of the products, so that the invention has excellent heatproof performance.

The invention relates to a micro alloyed oxide dispersion-strengthening ferrite steel, wherein the chemical formula of the steel is Fe-(14-16)Cr-(1-3)W-(0.3-1.0)Ti-(0.3-0.6)Y2O3-(0.5-3)Cu. The preparation method of the steel comprises the following steps of: thermosetting and moulding after mixing and ball milling Fe-Cr-W, Ti, Y2O3 and Cu in proportion, or thermosetting and moulding after mixing ball milling powder and Fe-Cr-W alloy powder in the ratio of 1: (2-4), and then carrying out solution treatment or solution and ageing treatment, thus micro Cu alloyed oxide dispersion-strengthening ferrite steel is obtained. In the invention, Cu is introduced into a matrix lattice by mechanical alloying; nano-scale copper-rich second phase is precipitated from a matrix in the thermosetting, moulding and heat treatment process; and the strength and high-temperature creep resistance of alloy are greatly improved. The invention has the advantages of simple preparation process, short preparation period, low preparation cost and low impurity content, and is easy to operate. The prepared alloy has good room-temperature and high-temperature mechanical properties and is applicable to industrial production.

The invention discloses magnesium-aluminum spinel casting sand prepared by sintering bauxite raw material and industrial magnesium oxide and a preparation process of the magnesium-aluminum spinel casting sand. The magnesium-aluminum spinel casting sand comprises the following main raw materials: 72.9% of bauxite raw material, 98% of magnesium oxide and the like. The preparation process comprises the following steps: weighing bauxite and industrial magnesium oxide powder according to a stoichiometric ratio, adding an appropriate amount of binders, mixing the materials, performing wet grinding, drying, pelletizing in a pelletizing machine, finally putting into a silicon molybdenum rod box type furnace for sintering and performing heat preservation at 1,550 DEG C for 5 h, cooling with the furnace, and then screening to obtain the magnesium-aluminum spinel casting sand. The novel spherical sand prepared by the preparation process disclosed by the invention has the characteristics of high temperature resistance, high strength, low thermal expansion rate, good anti-sticking sand performance, good recycling performance, low production cost and environmental friendliness; in the application aspect, the magnesium-aluminum spinel casting sand is suitable for molding methods of water glass, resin, bentonite and the like, and is suitable for precision casting, expendable pattern casting, V process casting and polishing treatment of nonferrous metals.

The continual casting directional solidification method for TiAl-base alloy plate comprises, putting TiAl alloy material bar 3 and dummy ingot 4 with rectangular intersection into the electromagnetic induction range of coil 6, galvanizing to coil 6 with single-phase alternating current with power of 75~100kW from electrical power for 20~25min; the alloy bar 3 and ingot 4 move downward with velocity of 0.01-0.05mm/min and get into the bottom crystallizer 8. This invention overcomes the limit to rectangular intersection blank and fits to press for high performance material in economy, science and national defense industry.

The invention discloses a mineral high-strength wear-resistant material which is prepared from the following raw materials in percentage by weight: 0.30-0.50% of C, 0.10-0.65% of Si, less than or equal to 1.0% of Mn, 1.0-4.5% of Cr, 0.05-3% of Ni, 0.15-1.5% of Mo, 0.05-0.5% of V, 0.010-0.5% of Nb, 0.01-0.5% of Al, less than or equal to 0.025% of P, less than or equal to 0.015% of S and the balanceof Fe. A chain wheel manufactured from the mineral high-strength wear-resistant material is excellent in alloy element proportion, is pure in steel, is uniform in structure, has excellent comprehensive performance, is high in chain gear hardness, is uniform in hardness and is good in wear resistance; and meanwhile, a base body part has good impact toughness and strength. The defects that a commonChinese chain wheel is poor in comprehensive performance and is low in coal passing amount are solved. The mineral high-strength wear-resistant material greatly improves the coal passing amount of the chain wheel, reduces chain wheel use cost, and improves economic benefits.

The invention discloses a high-entropy high-temperature alloy and a preparation method thereof, and belongs to the field of high-entropy alloys. The alloy comprises the following chemical components of, in percentage by atom, 35%-40% of Ni, 30%-35% of Co, 10%-13% of Al, 5%-10% of Cr, 5%-8.5% of Fe, 1%-2.5% of Ti, 1%-3% of Ta, 0.01%-1% of Mo, 0.01%-1% of W, 0-1% of Re, 0.02%-0.12 % of C, 0.002%-0.015% of B, 0.005%-0.12% of Hf, and 0.05%-0.15% of RE, wherein Al+Ti+Ta is greater than or equal to 14% and less than or equal to 16%, and RE is any one rare earth element of Ce, La and Y. The preparation process of the alloy comprises the following steps of weighing and matching alloy elements according to the molar ratio, putting the alloy elements into a smelting furnace for smelting, carrying out high-temperature refining and casting to obtain an alloy ingot, preparing a (001) oriented single crystal high-entropy high-temperature alloy bar by adopting a high-speed solidification Bridgeman method, and then performing solution treatment and secondary aging treatment on the alloy bar. The prepared alloy bar has good high-temperature strength and thermal corrosion resistance, and is a candidate material of a hot-end part of an aero-engine and an industrial gas turbine.

The invention discloses an oxide dispersion reinforced platinum-based alloy, which comprises a platinum alloy base material and a dispersion reinforcing phase dispersed in the platinum alloy base material, wherein the dispersion reinforcing phase consists of an oxide of boron, an oxide of erbium and an oxide of at least one of lanthanum and zirconium; and elements except oxygen in the dispersion reinforcing phase accounts for 0.015 to 0.8 percent of the total weight of the oxide dispersion reinforced platinum-based alloy, wherein at least 85 weight percent of dispersion reinforcing phase is dispersed in the platinum alloy matrix in a nano granule state. The invention also discloses a preparation method for the platinum alloy material. The platinum alloy material has the characteristics of excellent high-temperature mechanical property, short production period and the like, and is particularly suitable for manufacturing a porous dense large-sized glass fiber leakage plate (3,200 to 8,000 holes) and other required platinum-based high-temperature alloy structural materials.

A high-strength refractory Al alloy with high strength, size stability and resistance to high temp (350-400 deg.C) and wearing contains proportionally Si, Cu, Ni, Mn, Mg, Ti, B, Zr, Cd, P and Al. It features that it contains the uniformly distributed Al3X particles with LI2 crystal structure and TiB2 particles with hcc crystal structure.

The high strength connecting process for TiAl base alloy charging turbine and steel shaft includes the following steps: A. machining outer thread in the TiAl base alloy charging turbine and machining inner thread sleeve in the steel shaft and axial technological through hole; B. painting AgCuNiLi brazing paste to the inner wall of the inner thread sleeve; C. assembling the TiAl base alloy charging turbine and the steel shaft together; and D. brazing the assembled TiAl base alloy charging turbine and steel shaft. The present invention has high connection strength.

The invention belongs to the field of metal materials, relating to an aluminum-zirconium-phosphorus master alloy used for refining eutectic and primary silicon in hypereutectic Al-siliceous ferroalloy and a preparation method thereof. In a master alloy system, P exists in a mode of a ZrP compound which contains the following components by weight percent 78.0 percent to 94.0 percent of aluminum, 3.0 percent to 20.0 percent of zirconium and 1.0 percent to 6.0 percent of phosphorus. The preparation method comprises the following steps: preparing industrial pure aluminum, aluminum-phosphorus master alloy, sponge zirconium or potassium fluorozirconate according to the ratio; melting the industrial pure aluminum to 900 DEG C to 1300 DEG C in a melting furnace; firstly adding the aluminum-phosphorus master alloy to mix for 10 to 20 min; and then adding the sponge zirconium or the potassium fluorozirconate to fully react and uniformly mix, and directly casting the mixture to form a ingot or prepare a wire. The aluminum-zirconium-phosphorus master alloy has favorable refining effect, and can remarkably improve the high temperature mechanical properties of the alloy.

The invention belongs to the field of heat resistant stainless steel and relates to high-strength high-corrosion-resistance double-phase heat resistant steel. The high-strength high-corrosion-resistance double-phase heat resistant steel comprises 0-0.1% of C, 0.1-1.0% of Si, 0-0.5% of Mn, 12-25% of Cr, 15-22% of Ni, 0-4.0% of Mo, 1.0-6.0% of Al, 0.1-1.0% of Nb, 0-0.05% of B, not larger than 0.03% of P, not larger than 0.02% of S and the balance Fe. A preparation method is characterized in that the vacuum degree is strictly controlled to be smaller than or equal to 5 Pa in the smelting process, so that adverse influences of N and Al chemical compounds are avoided; a hammer forging manner is adopted, and the strain rate is controlled to be not smaller than 1s-1in the hot rolling process; and the reduction in a single pass is not smaller than 35%, and the second-phase size is controlled through rapid cooling. The high-strength high-corrosion-resistance double-phase heat resistant steel enables high-temperature corrosion resistance and high strength to be matched, and the comprehensive performance of the high-strength high-corrosion-resistance double-phase heat resistant steel is obviously higher than that of existing double-phase heat resistant steel when the high-strength high-corrosion-resistance double-phase heat resistant steel is used in a high-temperature corrosive environment.

The invention discloses a swash plate of an automobile air-condition compressor. The swash plate is prepared from an aluminium alloy comprising the following components in percentage by weight: 13-15% of Si, 4-5% of Cu, 0.2-0.3% of Mg, 0.8-1.5% of Ni, 0-0.1% of Mn, 0-0.5% of Fe, 0-0.1% of Zn, 0-0.2% of Ti, 0.1-0.3% of C, 0.1-0.3% of RE and the balance of Al. The invention further provides a production method of the swash plate of the automobile air-condition compressor. According to the production method provided by the invention, the high-temperature strength and the high-temperature hardness of the swash plate are improved, the cutting properties and the plasticity are improved, and low-cost production is realized by choosing and controlling elements in the aluminium alloy for the swash plate, and then replacing casting by forging, optimizing the pre-treatment and the post-treatment of the forging, and optimizing process parameters during the various treatment processes.

A water cooled electromagnetic directional solidifying method for Ti-based alloy features that the furnace containing crucible is vacuumized, and after the single-phase AC is applied to the coil for 4-16 min, the upper material rod and bottom material are moved downward to make the bottom material come in crystallier, resulting in uniform cooling speed and high mechanical performance of product.

The invention relates to hydrogen induced cracking (HIC)-resistant heat resistant steel in an iron element system and a preparation process thereof. The steel comprises the following components in percentage by weight: 0.1 to 0.15 percent of C, 0.2 to 0.5 percent of Si, 0.3 to 0.6 percent of Mn, 2.0 to 2.5 percent of Cr, 0.9 to 1.1 percent of Mo, less than or equal to 0.003 percent of S, less than or equal to 0.010 percent of P and the balance of iron and impurities. The preparation process comprises a heating process, a hot rolling process and a heat treatment process sequentially, wherein the heat treatment process comprises a normalizing process and a tempering process. The steel has a high comprehensive mechanical property, a high low-temperature impact property, high HIC resistance and relatively low tempering tendering sensitivity; and the preparation process is simple, easy to operate, low in cost, high in yield and wide in thickness specification ranges, and a small number of alloys with a few varieties are added.

The invention belongs to the technical field of inorganic nonmetallic materials and discloses a silicon oxide bonded silicon carbide material. The silicon oxide bonded silicon carbide material is prepared from, by mass, 60-75% of silicon carbide particles, 18-30% of silicon carbide fine powder, 3-8% of silicon carbide micro powder, 1-3% of silica powder, and 0.3-1.5% of nano-silica, and the total mass percentage of the raw materials is 100%. Liquid phenolic resin serving as a binding agent is also added to the silicon oxide bonded silicon carbide material. The raw materials for preparing the silicon oxide bonded silicon carbide material are evenly mixed with liquid phenolic resin to generate pug, the pug is molded, dried and then sintered in a high-temperature kiln with the highest sintering temperature being 1350-1500 DEG C, then the product is cooled together with the kiln to be indoor temperature so that the silicon oxide bonded silicon carbide material can be obtained. The silicon oxide bonded silicon carbide material has the advantages of being high in purity, excellent in high-temperature performance and high in comprehensive performance.