The invention provides a novel composite copper-based alloy material for a high speed railway and a preparation method of the novel composite copper-based alloy material The novel composite copper-based alloy material for the high speed railway comprises the following components: nanoscale silicon carbide accounting for 8-15% of the total volume and copper alloy ZCuSn10Pb1 accounting for 85-92% of the total volume The novel composite copper-based alloy material for the high speed railway has the advantages that a nano silicon carbide material is uniformly distributed in the existing alloy material by adopting a certain technical means, and performance of the alloy material is further improved by utilizing high hardness, high wear resistance, good self-lubricating property and strong high temperature strength of the nanoscale silicon carbide The obtained novel composite copper-based alloy material for the high speed railway has high strength, hardness and wear resistance, so that the service lives of parts such as a corresponding shaft sleeve for the high speed railway are prolonged, and the cost is reduced

Novel composite copper-based alloy material for high speed railway and preparation method of novel composite copper-based alloy material

A pantograph slide composite material and a preparation method thereof relate to a copper-based pantograph slide composite material and a preparation method thereof The invention solves the problems of poor interfacial wettability and low interfacial bonding strength between a ceramic reinforced phase and coppor in existing copper-based pantograph slide composite materials The composite material of the invention is prepared by copper powder and ceramic particles, wherein the surface of the ceramic particle has a chemical copper plate layer A mixed material is obtained by mixing the ceramic particles with chemical copper plate layers on the surfaces and the copper powder, and then the mixed material is processed by a hot-pressing sintering process or a combined process of hot-pressing sintering and hot extrusion The Ti3AlC2 ceramic particles inside the composite material have uniform distribution, high structure density, good interfacial bonding performance, and good mechanical properties; the density is up to 9986%-10079%; the hardness is up to 923-933 HB; the tensile strength is up to 230-300 MPa; and the friction coefficient is 015-04

Pantograph slide composite material and preparation method thereof

The invention discloses a copper-based graphite self-lubricating composite material and a preparing method thereof. The copper-based graphite self-lubricating composite material is prepared from copper alloy and a three-dimensional graphite framework, wherein the copper alloy comprises the ingredients of Cu, MoS2 and SiC. In the preparing process, a three-dimensional graphite framework blank is prepared through a selectivity laser sintering molding technology, and thus the three-dimensional graphite framework is obtained after graphitization is carried out; after the surface is plated with copper, the three-dimensional graphite framework is assembled into a sand mold cast cavity; and finally, the copper alloy and the three-dimensional graphite framework are combined through a casting manner, and the needed copper-based graphite self-lubricating composite material is obtained. By means of the method, the distribution range of graphite is controllable, the consecutiveness of a copper alloy matrix is ensured, and thus the copper-based graphite self-lubricating composite material has the good electric conductivity, heat conductivity, impact resistance and self-lubricating performance. The copper-based graphite self-lubricating composite material is used for preparing electric brushes, electrodes, pantograph pans, self-lubricating bearings and the like, and has wide application prospects.

Copper-based graphite self-lubricating composite material and preparing method thereof

The invention relates to a preparation method of a high heat-conducting diamond/copper-based composite material which consists of matrix copper, diamond powder and a molybdenum coating, wherein the volume fraction of molybdenum is 1-2%, the balance of diamond particles and copper. In diamond and copper, the volume fraction of the diamond powder is 15-50%. The preparation method provided by the invention can solve the problem that in methods of infiltration, powder metallurgy and the like, diamond powder and copper are non-wetting to lead to sintering densification. The preparation method comprises the following steps: I, plating molybdenum on the surfaces of the diamond particles by adopting a magnetron sputtering method to prepare molybdenum-coated diamond powder; II, plating copper on the surface of the molybdenum-coated diamond powder by a chemical plating method to prepare copper and molybdenum-coated diamond powder; III, mixing the composite powder obtained in step II and pure copper powder in a certain proportion by a mechanical mixing manner; and IV, hot pressing and sintering the mixed powder prepared in step III in vacuum to obtain the diamond/copper-based composite material. The material has a good interface bonding condition, high density and heat conductivity.

Preparation method of high heat-conducting diamond/copper-based composite material

The invention discloses an aluminum alloy material and a preparation method thereof. The aluminum alloy material is prepared from the following components in parts by weight: 0.12-0.16 part of oxide, 0.08-0.14 part of magnesium, 0.07-0.12 part of nickel foam, 0.05-0.08 part of silicon nitride, 0.02-0.08 part of graphene, 0.02-0.32 part of copper and 98.5-99.4 parts of aluminum. The invention also provides a preparation method of the aluminum alloy material. The preparation method comprises the following steps: (1) weighing 0.12-0.16 part by weight of oxide and 98.5-99.4 parts by weight of aluminum, heating to 660-690 DEG C in an inert atmosphere, and mixing evenly; (2) adding 0.02-0.08 part by weight of fully milled graphene in the inert atmosphere to the product obtained in the step 1, and heating to 700-710 DEG C; and (3) sequentially adding 0.08-0.14 part by weight of magnesium, 0.02-0.32 part by weight of copper, 0.07-0.12 part by weight of nickel, 0-0.09 part by weight of a crystal whisker and 0.05-0.08 part by weight of silicon nitride in the inert atmosphere, carrying out heat preservation for 0.5-2 hours, removing residues, and degassing, so as to obtain the aluminum alloy material. The aluminum alloy material prepared by the method can be used as a ground lead, an electric wire and a cable, and can be applied to the field of power.

Aluminum alloy material and preparation method thereof

The invention provides a copper coated graphite and nano-silicon carbide mixed reinforced copper-based composite material and a preparation method thereof, relates to a copper coated graphite and nano-silicon carbide mixed reinforced copper-based composite material prepared by a powder metallurgy method and the preparation method thereof, and solves the problems that the mechanical performance, electricity conducting performance and heat conducting performance cannot be considered at the same time in the conventional copper-based composite material. The material comprises 82 to 92 percent of pure copper powder or copper alloy powder, 5 to 15 percent of copper coated graphite particles, and 3 percent of nano-silicon carbide particles in volume percentage, and the method comprises the following steps: 1, pretreating of graphite particles before chemical copper plating; 2, chemical copper plating on the graphite particles; 3, mixing; 4, cold molding and hot-press sintering in vacuum; and5, hot extruding and deforming. Therefore, the prepared copper coated graphite and nano-silicon carbide mixed reinforced copper-based composite material has high mechanical performance and electric conducting performance, and can be widely applied to industrial production, such as pantograph pans, sliding contact and resistance welding electrode and the like, as excellent electric conducting and heat conducting functional materials.

Preparation method of copper coated graphite and nano-silicon carbide mixed reinforced copper-based composite material

The invention discloses a preparation method for a diamond/copper composite material with high heat conductivity and low heat expansion coefficient, which relates to a preparation method for a diamond/copper composite material, to solve the technical problem of low heat conductivity of the traditional composite material prepared by directly compositing the diamond and pure copper by adopting a powder metallurgy or infiltration method. The preparation method comprises the following steps of: (1) plating copper on the surface of diamond powder by adopting a chemical copper plating method to prepare copper plated diamond powder; (2) mixing the copper plated diamond powder in the step (1) with copper powder by adopting a mechanical powder mixing mode to form mixed powder; and (3) performing cold pressing and molding on the mixed powder prepared in the step (2), and compounding the mixed powder with copper through vacuum hot pressing and sintering to obtain the diamond/copper composite material with high heat conductivity and low heat expansion coefficient. After sintering, the interface bonding of the composite material is better, and the density is higher; and the heat conductivity of the composite material reaches 500W/m.K, and the heat expansion coefficient is reduced to 7.8*10 /K. The preparation method is applied to the field of preparation of diamond/copper composite materials.

Preparation method for diamond/copper composite material with high heat conductivity and low thermal expansion coefficient

The invention relates to a high-strength wear-resisting self-lubricating copper-base composite material in the field of new materials, which solves the problem of poor abrasion resistance and the like in the conventional copper materials. The composite material is prepared by mixing the following components in percentage by volume: 3 percent of silicon carbide, 5 to 15 percent of graphite powder, 82 to 92 percent of copper powder, and the prepared copper-base composite material has the high-strength wear-resisting and self-lubricating functions, has the excellent comprehensive performance, and is suitable for pantograph pans serving as critical components of power transmission systems of electrical locomotives with electrification and high-speed development of railways.

High-strength wear-resisting self-lubricating copper-base composite material

The invention discloses a copper-plating titanium diboride particle enhanced copper-based composite material and a preparation method thereof, belonging to the field of copper-based composite materials and solving the problems that a densified TiB2/Cu composite material is difficult to prepare with the traditional process due to poor wettability of copper to titanium diboride, and the cracks are easy to generate in the cooling process because titanium diboride particles and the copper have large difference in the thermal expansion coefficient and the elastic modulus. The composite material is prepared from 70-99 percent by volume of base phase and 1-30 percent by volume of copper-plating titanium diboride particles, wherein the base phase is pure copper powder or copper alloy powder. The preparation method comprises the steps of mixing and sintering. The copper-based composite material has the advantages of uniform titanium diboride particle distribution, favorable interface combination performance, favorable mechanical property and electrical conductivity, high strength, high wear resistance, high conductivity, high heat conductivity, integrated structural fucntion and wide application field.

Copper-plating titanium diboride particle enhanced copper-based composite material and preparation method thereof

The invention discloses a preparation method of a mixed reinforced three-dimensional quasi-continuous net-shaped aluminum-based composite, and relates to a preparation method of an aluminum-based composite. The invention aims at solving the problems of low plasticity and poor toughness of the conventional discontinuous reinforced aluminum-based composite. The preparation method comprises the following steps: 1, carrying out low-energy ball milling and blending by using zirconium oxide powder and aluminum alloy powder as raw materials to obtain mixed powder; 2, placing the mixed powder into a graphite mould to carry out cold press forming by adopting a cold press forming technology; and 3, sintering at a certain vacuum degree and temperature and mechanical pressurization, cooling to room temperature, and withdrawing the mould to obtain the mixed reinforced three-dimensional quasi-continuous net-shaped aluminum-based composite. The preparation method has the advantages that the tensile intensity is 180-240 MPa, the elongation is 1-2%, in comparison with the conventional discontinuous reinforced aluminum-based composite, the tensile intensity is improved for 50-100%, and elongation is improved for 100-300%. The preparation method, provided by the invention, is used for preparing the mixed reinforced three-dimensional quasi-continuous net-shaped aluminum-based composite.

Preparation method of mixed reinforced three-dimensional quasi-continuous net-shaped aluminum-based composite

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