CN107747070B - High-temperature wear-resistant composite material and preparation method thereof - Google Patents
High-temperature wear-resistant composite material and preparation method thereof Download PDFInfo
- Publication number
- CN107747070B CN107747070B CN201711192609.3A CN201711192609A CN107747070B CN 107747070 B CN107747070 B CN 107747070B CN 201711192609 A CN201711192609 A CN 201711192609A CN 107747070 B CN107747070 B CN 107747070B
- Authority
- CN
- China
- Prior art keywords
- powder
- composite material
- temperature
- copper
- carbon fiber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C49/00—Alloys containing metallic or non-metallic fibres or filaments
- C22C49/14—Alloys containing metallic or non-metallic fibres or filaments characterised by the fibres or filaments
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C47/00—Making alloys containing metallic or non-metallic fibres or filaments
- C22C47/14—Making alloys containing metallic or non-metallic fibres or filaments by powder metallurgy, i.e. by processing mixtures of metal powder and fibres or filaments
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
Abstract
The invention relates to a high-temperature wear-resistant composite material and a preparation method thereof. The raw materials comprise the following components in percentage by mass: 1.0-3.0% of short carbon fiber; 0.5-1.0% of fine ceramic particles; 1.5 to 10.0 percent of coarse ceramic particles; 6.0-15.0% of graphite powder; the balance being copper powder. The preparation method comprises the following steps: firstly, respectively preparing composite prealloy powder I and spherical composite prealloy powder II by high-energy ball milling and annealing processes with appropriate ball milling parameters; then, uniformly mixing coarse ceramic particles, graphite powder, copper powder, composite pre-alloy powder I and spherical composite pre-alloy powder II according to the design group distribution to obtain mixed powder; pressing and sintering to obtain the high-performance finished product. The copper-based composite material designed and prepared by the invention has the advantages of excellent mechanical property, high temperature resistance and wear resistance, high conductivity and simple preparation process.
Description
Technical Field
The invention relates to a copper-based composite material, in particular to a high-temperature wear-resistant composite material and a preparation method thereof.
Background
Copper has excellent electric conductivity, thermal conductivity and corrosion resistance, and is easy to process, but under the high temperature condition, the electric conductivity and the strength of the copper alloy are difficult to be considered, so in order to meet the use requirements of high-new technologies such as spaceflight, aviation, microelectronics and the like on the comprehensive performance, the development of the high-strength, high-conductivity, wear-resistant and high-temperature-resistant copper-based composite material which has excellent electric conductivity, high strength, excellent high-temperature performance and antifriction performance is urgent. Graphite and carbon fiber modified copper-based composite materials have a series of advantages of good electrical conductivity, thermal conductivity, excellent mechanical property, wear resistance, high temperature resistance, arc ablation resistance, good self-lubricating property and the like, and are widely applied to the fields of machine manufacturing, aerospace and the like as metal-based composite materials. In particular to be used for manufacturing high current density electric brushes, sliders, railway traffic pantograph slide plates, brake pads and the like.
However, with the increase of the working temperature, the copper matrix undergoes obvious high-temperature creep deformation, the high-temperature strength is obviously reduced, the fixing effect on internal friction components such as friction components is reduced, the mechanical property, the wear resistance and the like of the material are greatly reduced, and the application of the material in industry is limited. For example, the maximum instantaneous temperature generated by the brake pad for the high-speed train during braking can reach 600-1000 ℃, the requirements on the temperature resistance of the brake material and the friction and wear performance at high temperature are very strict, and the traditional cast iron and copper-based composite material cannot meet the braking requirements of the high-speed train.
at present, the method for improving the high-temperature strength of the copper-based composite material mainly comprises particle dispersion strengthening and fiber composite strengthening. The fiber composite reinforced copper-based composite material can not only realize the reinforcement of a metal composite body, but also obviously improve the toughness of the material by adding the second-phase fibers. The dispersion strengthening copper-based material has a softening point close to the melting point of Cu by adding the high-temperature resistant fine ceramic particle phase, and the dispersion strengthening can play a synergistic effect of the matrix and the strengthening material, can not obviously reduce the conductivity of the copper matrix, can also obviously improve the room temperature and high temperature performance of the matrix, and is a main strengthening means for obtaining the high-strength high-conductivity copper-based composite material.
Chinese patent CN 102978434A discloses a short fiber and particle synergistically reinforced copper-based composite material and a preparation method thereof, wherein short fibers such as carbon nano tubes, nano carbon fibers, ceramic short fibers and the like are adopted, and alumina, zirconia, magnesia, titanium dioxide, silicon carbide, titanium carbide, tungsten carbide, silicon nitride, aluminum nitride, titanium diboride, Ti3SiC2isoparticulate synergistically enhanced copper-based composites. Short fibers and particles are used as a reinforcing phase, the content of the short fibers is 0.1-2 wt.%, and the content of the reinforcing body particles is 0.1-10 wt.%. Compared with pure copper, the room temperature and high temperature strength of the composite material are improved by more than 3 times through mixing, forming, sintering and processing, the electrical conductivity reaches more than 80% of the pure copper, the thermal conductivity is more than 70% of the pure copper, the friction coefficient is reduced by 70%, and the wear rate is reduced by 50%. Chinese patent CN 105734461A discloses a carbon fiber reinforced copper-based composite material and a preparation method thereof, wherein the composite material comprises the following components in percentage by mass: 4-12% of carbon fiber, 1-2% of lead powder, 1-8% of titanium boride, 1-2% of niobium powder, 3-7% of silver sulfide, 6-10% of hydroxyapatite, 20-30% of sodium peroxide, 4-10% of disodium hydrogen phosphate, 5-9% of silicon carbide, 10-15% of hydroxymethyl cellulose and the balance of copper powder. The preparation method comprises the following steps: mixing copper components, and passing through 200 deg.Csieving with a sieve, and drying; pressing and forming under the pressure of 600-700 MPa; sintering; cooling to 15-30 ℃. The expansion coefficient of the invention is 6-7 x 10-6 DEG C-1the thermal conductivity is 203-206W/(m.K), the thermal conductivity and the expansion coefficient are relatively high, and the heat conduction and electric conduction effects are obviously improved by adding the hydroxyapatite. Chinese patent CN105256349A discloses a preparation process of carbon fiber reinforced copper-based composite material, which is to remove glue from carbon fiber, and then to copper-plate the surface of the carbon fiber, so as to improve the bonding strength of the plating layer and the carbon fiber, and comprises the following steps: carbon fiber heating degumming, alkaline degreasing, cleaning, card loading, primary copper plating, secondary copper plating, cleaning, passivation, card unloading and preparation completion. The heating temperature for removing the carbon fiber glue is 300-400 ℃, the heating time is 5-10 min, the alkaline oil removal is 10% NaOH solution, and the temperature is 40-50 ℃. The copper plating comprises 30-40 g/L of copper sulfate and 60-80 g/L of potassium nitrate, the temperature of the solution is 45-55 ℃, the PH value is 9.0-9.5, the time of each electroplating is 60-80 s, and the current is 0.4-0.6A. The thickness of the electroplated layer on the surface of the carbon fiber is uniform, the mechanical property of the carbon fiber is not damaged, and the conductivity of the carbon fiber is greatly improved.
The carbon nano tube reinforced copper-based composite material is prepared by the powder metallurgy method of Wangsen and the like, the abrasion performance of a matrix is obviously improved by adding the carbon nano tube, when 3 vol.% of the carbon nano tube is added, the specific abrasion rate of the composite material is the minimum and is only 1/4-1/3 of that of pure copper, the optimal preparation process of the carbon nano tube reinforced copper-based composite material is determined, and the density of a sample averagely reaches 97% [ Wangson, Master thesis, Lanzhou university, 2009 ]]. The aged Yuan is prepared from Cu, Ni and Y2O3、MoS2The Graphite mixed powder is used as a matrix, and the nano Al is prepared by adopting a powder metallurgy method2O3reinforcing novel copper-based self-lubricating composite material. The nano Al in the accompanying copper alloy powder is found2O3The particle content is increased, the density of the composite material is reduced, the hardness and the crushing strength are increased firstly and then reduced, and Al2O3When the content is 2%, the hardness reaches HV 35.1, and the crushing strength reaches 276 MPa. The mixed solid self-lubricating material consisting of graphite and MoS2 has a small and stable coefficient of friction (about 0.12), with 2 wt.% Al added2O3the composite material has the least abrasion loss and is not added with Al2O31/7 to 1/8 of (1/7). Copper matrix is processed by nickel and nano Al2O3When dispersed particles are strengthened and solid lubricating phase graphite and MoS2 are added, the obtained material has certain self-lubricating performance [ Chen Yuan, Liu Yi Jie, Liu Chang, Su Gui Fang, composite material academic newspaper, 2009, 26 (6): 109-115]. Zhangwenli et al respectively adopt a hot-pressing sintering method and a powder metallurgy method to prepare the short carbon fiber reinforced Cu-Ti3SiC2Composite material, study CfThe influence of the surface copper electroplating treatment on the density, the hardness and the resistivity of the composite material. The optimal process conditions for preparing the composite material by hot pressing are determined as follows: vTSCWhen 10%, CfThe optimal content is 8%; vTSCWhen 15%, Cfthe optimal content is 10 percent; the optimal hot-pressing sintering temperature is 800-850 ℃, the pressure is 30MPa, and the heat preservation is 90min (Zhang Wenli, Master thesis, Wuhan theory university, 2006)]。
The copper-based composite material designed and prepared by the method has the defects of low strength at room temperature and high temperature, poor toughness, incapability of cold press molding and the like. So far, no high-performance copper-based composite material prepared by cold press molding is seen.
disclosure of Invention
the invention provides a high-temperature wear-resistant composite material and a preparation method thereof, aiming at the problems of low room-temperature and high-temperature strength, poor toughness and the like of the existing copper-based composite material, namely the copper-based composite material reinforced by short carbon fibers, oxide and carbide particles in a synergistic manner is adopted, and the problems of poor strengthening and toughening and high-temperature resistant effects, difficult forming and the like caused by uneven dispersion of the short carbon fibers and micron-sized oxide particles in a matrix are solved through a high-energy ball milling combined heat treatment process, so that the copper-based composite material with high strength, high toughness, high temperature resistance and good wear resistance is obtained.
The invention relates to a high-temperature wear-resistant composite material, which comprises the following raw materials in percentage by mass:
1.0 to 3.0% of short carbon fiber, preferably 1.0 to 2.0%, and more preferably 1.0 to 1.5%;
0.5 to 1.0% of fine ceramic particles, preferably 0.5 to 0.8%, and more preferably 0.5 to 0.6%;
1.5 to 10.0% of coarse ceramic particles, preferably 5 to 10%, and more preferably 8 to 10%;
6.0-15.0 wt% of graphite powder, preferably 8-12%, and more preferably 9-11%;
The balance of copper powder;
The particle size of the fine ceramic particles is 1-5 microns, and the particle size of the coarse ceramic particles is 20-200 microns; the particle size of the graphite powder is 80-150 microns.
the high-temperature wear-resistant composite material is characterized in that the short carbon fibers have the diameter of 7-10 mu m and the length of 1-4 mm; the copper powder is electrolytic copper powder with the granularity of 30-80 mu m.
The invention relates to a high-temperature wear-resistant composite material, wherein the fine ceramic particles are alumina powder and/or zirconia powder, and the coarse ceramic particles are selected from at least one of alumina, zirconia, silicon carbide and silicon dioxide; the graphite powder is flake graphite powder. According to the invention, the short carbon fibers and the fine ceramic particles are used as a reinforcing and toughening phase and a high-temperature resistant phase, the coarse ceramic particles and the short carbon fibers are used as a wear-resistant phase, and the graphite is used as a lubricating phase.
The invention relates to a preparation method of a high-temperature wear-resistant composite material; the method comprises the following steps:
Step one
Preparing composite prealloying powder I and composite prealloying powder II;
the preparation of the composite pre-alloyed powder I comprises the following steps:
The following raw materials are prepared according to mass percentage;
94-98% of electrolytic copper powder;
2-6% of short carbon fiber;
the granularity of the electrolytic copper powder is 30-80 mu m;
The short carbon fiber is degummed short carbon fiber; the diameter is 7-10 μm, and the length is 1-4 mm;
carrying out high-energy ball milling on the prepared raw materials to obtain composite pre-alloyed powder I uniformly embedded with short carbon fibers; annealing the composite pre-alloy powder I to obtain standby composite pre-alloy powder I; the rotating speed of the high-energy ball mill is 220-300 r/min, and the ball milling time is 6-14 h; the annealing temperature is 300-400 ℃, the time is more than or equal to 30min, and the annealing atmosphere is hydrogen atmosphere;
the preparation of the composite pre-alloyed powder II comprises the following steps:
The following raw materials are prepared according to mass percentage;
95-98% of electrolytic copper powder;
2-5% of fine ceramic particle alumina and/or zirconia;
the granularity of the electrolytic copper powder is 30-80 mu m;
the particle size of the fine ceramic particles is 1-5 mu m; the fine ceramic particles are alumina and/or zirconia;
Carrying out high-energy ball milling on the prepared transported materials to obtain spherical composite pre-alloyed powder II uniformly embedded with oxide particles; annealing the spherical composite pre-alloy powder II to obtain standby composite pre-alloy powder II; the rotating speed of the high-energy ball mill is 220-300 r/min, and the time is 6-14 h; the annealing temperature is 300-400 ℃, the time is more than or equal to 30min, and the annealing atmosphere is hydrogen atmosphere;
step two
Taking coarse ceramic particles, graphite powder, copper powder, composite pre-alloy powder I and spherical composite pre-alloy powder II according to the design group distribution, and uniformly mixing to obtain mixed powder;
Step three
pressing and forming the mixed powder obtained in the step two to obtain a pressed blank;
step four
pressurizing and sintering the pressed compact obtained in the step three under the protective atmosphere to obtain a high-temperature wear-resistant composite material; the pressure sintering temperature is 850-950 ℃, and the pressure is 2-6 MPa.
The invention relates to a preparation method of a high-temperature wear-resistant composite material; the short carbon fiber is degummed short carbon fiber after annealing and degumming. Annealing to remove the glue, or buying to remove the glue, otherwise the embedding rate is very low. In the invention, the length of the short carbon fiber of the raw material is strictly controlled and the short carbon fiber must be a degummed product, and the aim is to realize the degummed short carbon fiber; the ball milling rotating speed of the invention can well realize the embedding of the carbon fiber in the copper particles.
the invention relates to a preparation method of a high-temperature wear-resistant composite material; the content of the short carbon fibers in the composite pre-alloyed powder I is 2-6 times of that in the mixed powder obtained in the step two.
the invention relates to a preparation method of a high-temperature wear-resistant composite material; the content of the fine ceramic particles in the composite pre-alloyed powder II is 2-10 times of that in the mixed powder obtained in the step two.
The invention relates to a preparation method of a high-temperature wear-resistant composite material; when the composite pre-alloy powder I is prepared, the annealing time is controlled to be 30-90 min;
and when preparing the spherical composite prealloying powder II, controlling the annealing time to be 30-90 min.
The invention relates to a preparation method of a high-temperature wear-resistant composite material; in the second step, during material mixing, stirring the materials uniformly by a V-shaped mixer; the stirring speed of the V-shaped mixer is 80-150 r/min.
the invention relates to a preparation method of a high-temperature wear-resistant composite material; in the third step, the compression molding mode comprises cold press molding; the pressure of the cold press molding is 250-450 MPa, and the pressure maintaining time is 20-30 min.
the invention relates to a preparation method of a high-temperature wear-resistant composite material; step four, the pressed compact obtained in the step three is subjected to pressure sintering in a protective atmosphere, then pressure relief is carried out, and cooling is carried out, so that the high-temperature wear-resistant composite material is obtained; the protective atmosphere is hydrogen atmosphere or nitrogen atmosphere; and during sintering, controlling the temperature to be 850-950 ℃, the time to be 1-4 h and the pressure to be 2-6 MPa.
the copper-based composite material designed and prepared by the invention has the advantages of excellent mechanical property, high temperature resistance and wear resistance, high conductivity and simple preparation process.
according to the preparation method of the high-temperature wear-resistant composite material, the prepared high-temperature wear-resistant composite material basically keeps the electric conductivity and the thermal conductivity of a copper matrix, the room-temperature strength and the high-temperature strength are more than 3 times of those of pure copper, and the friction coefficient is greatly reduced. The copper-based composite material designed and prepared by the invention has the advantages of excellent mechanical property, high temperature resistance and wear resistance, high conductivity and simple preparation process.
the invention firstly tries to prepare composite prealloy powder I and spherical composite prealloy powder II respectively by high-energy ball milling and annealing processes with proper ball milling parameters; then, uniformly mixing coarse ceramic particles, graphite powder, copper powder, composite pre-alloy powder I and spherical composite pre-alloy powder II according to the design group distribution to obtain mixed powder; pressing and sintering to obtain the high-performance finished product.
The density of the finished product obtained by the invention is more than or equal to 98 percent, and the friction coefficient is less than or equal to 0.05.
Principle and advantages:
(1) The wettability between carbon fiber and copper is extremely poor, the interface between a copper matrix and the carbon fiber needs to be modified in order to prepare a composite material with excellent comprehensive performance, and the main approaches at present are the alloying of the matrix and the surface treatment of the carbon fiber. However, the alloy elements for improving wettability are easy to react with carbon or mutually dissolve with carbon, and form brittle compounds and even brittle interface layers in the interface reaction, which is not favorable for improving the interface structure and the performance of the carbon-copper composite material, and the alloying of the matrix not only can reduce the conductivity of the copper alloy, but also has no obvious effect on improving the high-temperature strength of the material. The prior successful fiber surface treatment method is chemical vapor deposition, chemical plating or electroplating copper plating on the surface of the carbon fiber, which is a successful method for improving the interface bonding strength of the composite material at present, but the relative process is more complex.
the high-temperature wear-resistant composite material disclosed by the invention firstly tries to solve the problem that short carbon fibers are unevenly dispersed in a copper matrix under the conventional mixing process by adopting high-energy ball milling, realizes the embedding of the short carbon fibers in copper particles, and realizes the metallurgical bonding of a micro-area at the surface joint of copper and carbon fibers under the high-energy ball milling process, thereby improving the interface bonding strength between the copper particles and the carbon fibers. The morphology of the powder obtained by directly mixing copper powder and short carbon fibers in a V-shaped blender is shown in FIG. 8, and the carbon fiber-embedded copper powder prepared by the high-energy ball milling method is shown in FIG. 9. As can be seen from FIG. 8, the carbon fibers are not crushed and broken and are not embedded in the copper powder when the conventional V-shaped mixer is used for mixing materials, and the morphology of the copper powder is basically unchanged. As can be seen from fig. 9, after the high energy ball milling treatment, the copper powder is significantly deformed, the original short carbon fiber bundle is broken, and a large amount of copper powder particles are significantly embedded. The conventional mixed materials can not solve the dispersion problem of the short carbon fibers, the length of the carbon fibers is not changed (the length of the carbon fibers still keeps a millimeter level), and the overlong fibers can not fully exert the fiber reinforcing and toughening effects through pressing, but can easily become crack sources for the fracture of the composite material. The high-energy ball milling process is adopted to realize the embedding of the short carbon fiber, which plays a decisive role in the dispersion of the carbon fiber in the matrix in the later period, and the length of the carbon fiber is obviously shortened to hundreds of microns through the process, so that the short carbon fiber can fully exert the advantages of the short carbon fiber.
Because the copper powder inlaid with the carbon fibers after the high-energy ball milling has serious work hardening and difficult forming, and the work hardening becomes more obvious along with the prolonging of the ball milling time, the plasticity of the copper powder inlaid with the carbon fibers is improved by controlling the high-energy ball milling time and combining with a subsequent heat treatment annealing process, and the pressing performance of the powder is improved.
after the copper powder is added into the short carbon fiber in an embedded form, the short carbon fiber is mixed with other raw materials according to the raw material proportion, so that the problem of easy agglomeration caused by direct mixing of the conventional short carbon fiber in a raw material form can be solved, the short carbon fiber is uniformly distributed in a matrix, the short carbon fiber reinforced copper-based composite material with high toughness and uniform performance is obtained, the preparation process is simple, and the powder can be formed under the cold pressing condition.
(2) Although the high-temperature ceramic particles such as alumina or zirconia can obviously improve the room-temperature and high-temperature strength of the copper alloy, the high-temperature ceramic particles with excessively large particle size or uneven mixing can easily become crack sources of the alloy, so that the plasticity of the material is greatly reduced. Therefore, the ceramic particles with micron-sized particle sizes are combined with a special mixing process, and the high-strength and high-temperature-resistant effects of the ceramic particles can be fully exerted.
the high-temperature wear-resistant composite material disclosed by the invention firstly tries to solve the problems that micron-sized particles are easy to agglomerate and disperse unevenly in a copper matrix under the conventional mixing process by adopting high-energy ball milling, so that the embedding of oxide ceramic particles in the copper particles is realized, and the nearly spherical composite pre-alloy powder with very good fluidity is obtained by controlling the technological parameters of the high-energy ball milling, wherein the copper powder embedded in the oxide ceramic particles is shown in figure 11. The morphology of the resulting powder obtained by directly passing copper powder and oxide particles through a V-blender for mixing is shown in fig. 10. As can be seen from FIG. 10, the materials are mixed by a conventional V-shaped mixer, alumina is randomly dispersed, only a small amount of alumina is adhered to the dendritic crystal of the copper powder, the alumina is not embedded into the same particle, and the morphology of the copper powder is basically unchanged. As can be seen from fig. 11, after the high energy ball milling treatment, the copper powder was significantly agglomerated and spheroidized, and the oxide particles were uniformly embedded in and on the copper particles. Moreover, since the composite copper powder embedded in the oxide ceramic particles after the high-energy ball milling has serious work hardening and difficult forming, the plasticity of the copper powder embedded in the oxide ceramic particles needs to be improved and the pressing performance of the powder needs to be improved by controlling the high-energy ball milling time and combining with a subsequent heat treatment annealing process.
(3) although graphite can be used as a lubricating component to reduce the wear rate of the copper-based composite material, the graphite needs to have proper particle size and good dispersion degree in a matrix. However, continuous graphite can cause the electrical conductivity and strength of copper to be greatly reduced, the graphite surface is smooth, and reinforcing components and friction components near the bulk graphite are easy to fall off in the friction process, so that the friction performance of the material is reduced. The invention selects short carbon fiber to replace part of graphite, can be used as a lubricating component to reduce the consumption of graphite, plays a certain role in lubricating while improving the toughness of the copper-based alloy, reduces the wear rate of the material and prevents wear duality.
(4) Coarse ceramic particles of 20-200 microns of alumina, zirconia, silicon carbide, silicon dioxide and the like and short carbon fibers are selected as friction components, so that stable friction coefficient is provided and the braking torque required by braking is met. Because of the reinforcing mechanism of the short fiber and the particles to the copper-based composite material, the force born by the short fiber is transmitted by the base material through the interface, and the reinforcing body particles are combined, so that the 'holding' effect of the base body to the short fiber is enhanced, the reinforcing effect at room temperature and high temperature is obviously improved, the 'clamping' effect to a friction component is also obviously enhanced, and the falling phenomenon can not occur even in high-temperature friction, thereby improving the friction and wear performance of the material and reducing the wear rate of the material.
in a word, the invention has the advantages of simple preparation process (only cold pressing forming and pressure sintering), low cost, excellent and uniform performance of the obtained composite material and good market prospect.
Drawings
FIG. 1 is a flow chart of the preparation of composite pre-alloyed powder I or composite pre-alloyed powder II in the high-temperature wear-resistant composite material provided by the invention;
FIG. 2 is a flow chart of the preparation of the high-temperature wear-resistant composite material provided by the invention;
FIG. 3 is a high temperature abrasion resistant composite pressed according to comparative example 1;
FIG. 4 is a high temperature abrasion resistant composite pressed according to comparative example 2;
FIG. 5 is a high temperature abrasion resistant composite pressed according to comparative example 3;
FIG. 6 is a high temperature abrasion resistant composite material pressed according to example 2;
FIG. 7 is a high temperature abrasion resistant composite pressed according to example 3;
FIG. 8 is an SEM image of the powder mixture of copper powder and short carbon fibers in a V-shaped blender;
FIG. 9 is an SEM topography of the composite prealloyed powder I prepared in the present invention, i.e., the copper powder embedded in the carbon fibers;
FIG. 10 is a powder SEM image of copper powder and oxide powder mixed in a V-blender;
FIG. 11 is an SEM topography of the composite prealloyed powder II prepared in accordance with the present invention, i.e., copper powder embedded with oxide ceramic particles;
fig. 1 shows the preparation process of the composite pre-alloyed powders I and II in the high-temperature wear-resistant composite material, which is specifically as follows: firstly, respectively carrying out high-energy ball milling on short carbon fibers or oxide ceramic particles and electrolytic copper powder according to a certain proportion, and then carrying out annealing treatment on mixed powder obtained by the high-energy ball milling under the protection of atmosphere so as to eliminate the internal stress and crystal defects of the powder, improve the plasticity and formability of the powder and obtain composite pre-alloy powder I and composite pre-alloy powder II embedded with the carbon fibers or the oxide particles.
fig. 2 shows a preparation process of the high-temperature wear-resistant composite material designed by the scheme of the invention, which specifically comprises the following steps: firstly, wet mixing the composite pre-alloyed powder I or II, electrolytic copper powder, coarse ceramic particles and crystalline flake graphite according to a certain proportion, drying, pressing the mixed powder into a blank, and then sintering under pressure under the protection of atmosphere to obtain the high-temperature wear-resistant composite material.
as can be seen from fig. 3 to 5, neither the mixed powder obtained by directly mixing the short carbon fiber with the copper powder, alumina, and graphite powder, nor the powder subjected to annealing heat treatment after the high-energy ball milling treatment of the short carbon fiber or oxide particle ceramic with the copper powder can be directly cold-pressed and formed. The carbon fiber in the directly mixed powder is too long and is seriously agglomerated, so the powder is difficult to form. And the powder after the high-energy ball milling has serious work hardening and poor formability.
As can be seen from fig. 6 to 7, the short carbon fibers or the oxide particle ceramics and the copper powder can be directly cold-pressed and formed after being subjected to high-energy ball milling treatment and annealing heat treatment.
As can be seen from FIG. 8, when the conventional V-shaped mixer is used for mixing materials, the carbon fibers are not crushed and broken, and are not embedded into the copper powder, and the morphology of the copper powder is basically unchanged.
As can be seen from fig. 9, after the high energy ball milling treatment, the copper powder is significantly deformed, the original short carbon fiber bundles are broken, and a large amount of copper powder particles are embedded.
As can be seen from FIG. 10, when the conventional V-shaped mixer is used for mixing materials, the aluminum oxide is randomly dispersed, only a small amount of aluminum oxide is adhered to the dendritic crystal of the copper powder, the aluminum oxide is not embedded into the same particle, and the morphology of the copper powder is basically unchanged.
As can be seen from fig. 11, after the high energy ball milling treatment, the copper powder was significantly agglomerated and spheroidized, and the oxide particles were uniformly embedded in and on the copper particles.
Detailed Description
Comparative example 1
The high-temperature wear-resistant composite material prepared in the comparative example 1 comprises the following components in percentage by mass:
73% of electrolytic copper powder, 2.0% of short carbon fiber, 15.0% of flake graphite powder and 10.0% of alumina powder. The particle size of the electrolytic copper powder is 45 μm, the diameter of the short carbon fiber is 9 μm, the length is 2mm, the particle size of the flake graphite powder is 50 μm, and the particle size of the alumina powder is 150 μm.
And (3) adding the prepared raw material powder into a V-shaped mixer, adding 1 wt% of kerosene according to the total mass, mixing for 6 hours, and drying to obtain mixed powder. And then cold pressing the mixed powder at room temperature, wherein the pressing pressure is 300MPa, and the pressure maintaining time is 20 s. Because the copper powder and the short carbon fiber are directly mixed and pressed, the short carbon fiber is seriously agglomerated, and the mixed powder cannot be formed.
comparative example 2
The high-temperature wear-resistant composite material prepared in the comparative example 2 comprises the following components in percentage by mass:
76% of electrolytic copper powder, 2.0% of short carbon fiber, 12.0% of flake graphite powder, 8.0% of alumina powder and 2.0% of silicon carbide powder. The particle size of the electrolytic copper powder is 40 μm, the diameter of the short carbon fiber is 7 μm, the length is 2mm, the particle size of the flake graphite powder is 50 μm, the particle size of the alumina powder is 100 μm, and the particle size of the silicon carbide powder is 50 μm.
Firstly, preparing composite prealloy powder I of short carbon fiber and copper powder, which comprises the following components in percentage by mass: 95% of electrolytic copper powder and 5.0% of short carbon fiber. Carrying out high-energy ball milling treatment on the electrolytic copper powder and the short carbon fiber, wherein the ball milling rotation speed is 250 revolutions per minute, and the ball milling time is 10 hours; obtaining the composite pre-alloyed powder I with the short carbon fibers uniformly embedded.
Adding the mixed materials of electrolytic copper powder, composite pre-alloyed powder I, crystalline flake graphite powder, alumina powder and silicon carbide powder according to the raw material ratio, adding 1 wt% of kerosene according to the total mass, mechanically stirring for 4 hours until the mixed materials are uniformly mixed, and then placing the mixed materials in an oven for drying at the drying temperature of 80 ℃ to obtain mixed powder. And then, carrying out cold press molding on the mixed powder at room temperature, wherein the pressing pressure is 350MPa, and the pressure maintaining time is 20 s. The composite prealloy powder I of the high-energy ball-milling short carbon fiber and the copper powder is seriously hardened, so that cold-pressing forming cannot be carried out, and an obvious layering phenomenon appears.
Comparative example 3
the high-temperature wear-resistant composite material prepared in the comparative example 3 comprises the following components in percentage by mass:
81% of electrolytic copper powder, 9.0% of flake graphite powder, 1.0% of fine zirconia powder, 8.0% of coarse alumina powder and 1.0% of silica powder. The granularity of the electrolytic copper powder is 60 microns, the granularity of the crystalline flake graphite powder is 40 microns, the granularity of the fine zirconia powder is 2 microns, the granularity of the coarse alumina powder is 120 microns, and the granularity of the silica powder is 50 microns.
Firstly, preparing composite prealloying powder II of oxide particles and copper powder, which comprises the following components in percentage by mass: 97% of electrolytic copper powder and 3.0% of fine zirconia powder. Carrying out high-energy ball milling treatment on the electrolytic copper powder and the zirconia powder, wherein the ball milling rotation speed is 250 revolutions per minute, and the ball milling time is 10 hours; to obtain the composite prealloy powder II evenly embedded with the zirconia particles.
Adding the mixture of electrolytic copper powder, composite pre-alloyed powder II, flake graphite powder, alumina powder and silicon carbide powder according to the raw material ratio, adding 1 wt% of kerosene according to the total mass, mechanically stirring for 4 hours until the mixture is uniformly mixed, and then placing the mixture in an oven for drying at the drying temperature of 80 ℃ to obtain mixed powder. And then, carrying out cold press molding on the mixed powder at room temperature, wherein the pressing pressure is 350MPa, and the pressure maintaining time is 20 s. The composite prealloy powder II of the high-energy ball-milled zirconia particles and the copper powder is seriously hardened, so that cold-pressing forming cannot be carried out, and an obvious layering phenomenon also occurs.
example 1
The high-temperature wear-resistant composite material prepared in the embodiment 1 comprises the following components in percentage by mass:
72% of electrolytic copper powder, 2.0% of short carbon fiber, 15.0% of flake graphite powder, 1.0% of fine alumina powder and 10.0% of coarse alumina powder. The particle size of the electrolytic copper powder is 45 mu m, the diameter of the short carbon fiber is 7 mu m, the length is 2mm, the particle size of the crystalline flake graphite powder is 50 mu m, the particle size of the coarse alumina powder is 150 mu m, and the particle size of the fine alumina powder is 3 mu m.
firstly, preparing composite prealloy powder I of short carbon fiber and copper powder, which comprises the following components in percentage by mass: 96% of electrolytic copper powder and 4.0% of short carbon fiber. Carrying out high-energy ball milling treatment on the electrolytic copper powder and the short carbon fiber, wherein the ball milling rotation speed is 260 revolutions per minute, and the ball milling time is 8 hours; and finally, carrying out annealing heat treatment under the protection of hydrogen atmosphere, wherein the annealing temperature is 350 ℃, and the heat preservation time is 30min, so as to obtain the composite pre-alloyed powder I uniformly inlaid with the short carbon fibers.
Then preparing composite prealloying powder II of oxide particles and copper powder, wherein the composite prealloying powder II comprises the following components in percentage by mass: 96% of electrolytic copper powder and 3.0% of fine alumina powder. Carrying out high-energy ball milling treatment on the electrolytic copper powder and the short alumina powder, wherein the ball milling rotation speed is 250 revolutions per minute, and the ball milling time is 10 hours; and finally, carrying out annealing heat treatment under the protection of hydrogen atmosphere, wherein the annealing temperature is 400 ℃, and the heat preservation time is 70min, thus obtaining the composite pre-alloy powder II uniformly embedded with the alumina particles.
adding 1 wt% kerosene of the total mass into electrolytic copper powder, composite pre-alloy powder I, composite pre-alloy powder II, coarse alumina, graphite powder and the like which are prepared according to a certain proportion in a V-shaped mixer, mixing for 6 hours, and drying to obtain mixed powder. And then cold pressing the mixed powder at room temperature, wherein the pressing pressure is 400MPa, the pressure maintaining time is 20s, the prepared copper-based composite material pressed blank is subjected to pressure sintering under the protection of hydrogen atmosphere, the pressed blank is sintered for 2h at 920 ℃, the heating rate and the cooling rate of a furnace are both 10-15 ℃/min, and the properties of the sample piece obtained in the embodiment 1 are as follows: density 98.5%, hardness 98N/mm2Conductivity 5.4X 107Ω-1·m-1The thermal conductivity was 217W/mk, and the coefficient of friction was 0.03. The strength of the product is superior to that of the existing product.
Example 2
The high-temperature wear-resistant composite material prepared in this example 2 includes the following components in percentage by mass:
81% of electrolytic copper powder, 9.0% of flake graphite powder, 1.0% of fine zirconia powder, 8.0% of coarse alumina powder, 1.0% of silica powder and 2.5% of short carbon fiber. The granularity of the electrolytic copper powder is 60 mu m, the granularity of the crystalline flake graphite powder is 40 mu m, the granularity of the fine zirconia powder is 2 mu m, the granularity of the coarse alumina powder is 120 mu m, the granularity of the silica powder is 50 mu m, the diameter of the short carbon fiber is 8 mu m, and the length of the short carbon fiber is 2 mm.
Firstly, preparing composite prealloy powder I of short carbon fiber and copper powder, which comprises the following components in percentage by mass: 95% of electrolytic copper powder and 5.0% of short carbon fiber. Carrying out high-energy ball milling treatment on the electrolytic copper powder and the short carbon fiber, wherein the ball milling rotation speed is 250 revolutions per minute, and the ball milling time is 10 hours; and finally, carrying out annealing heat treatment under the protection of hydrogen atmosphere, wherein the annealing temperature is 350 ℃, and the heat preservation time is 50min, so as to obtain the composite pre-alloyed powder I uniformly inlaid with the short carbon fibers.
then preparing composite prealloying powder II of oxide particles and copper powder, wherein the composite prealloying powder II comprises the following components in percentage by mass: 97% of electrolytic copper powder and 3.0% of fine zirconia powder. Carrying out high-energy ball milling treatment on the electrolytic copper powder and the zirconia powder, wherein the ball milling rotation speed is 250 revolutions per minute, and the ball milling time is 10 hours; and finally, carrying out annealing heat treatment under the protection of hydrogen atmosphere, wherein the annealing temperature is 400 ℃, and the heat preservation time is 60min, so as to obtain the composite prealloy powder II uniformly embedded with the zirconia particles.
adding the mixture of electrolytic copper powder, composite pre-alloy powder I, composite pre-alloy powder II, crystalline graphite powder, alumina powder and silicon carbide powder according to the raw material ratio, adding 1 wt% of kerosene according to the total mass, mechanically stirring for 4 hours until the mixture is uniformly mixed, and then placing the mixture in an oven for drying at the drying temperature of 80 ℃ to obtain the mixed powder. And then cold pressing the mixed powder at room temperature, wherein the pressing pressure is 450MPa, the pressure maintaining time is 20s, the prepared copper-based composite material pressed blank is subjected to pressure sintering under the protection of hydrogen atmosphere, the pressed blank is sintered for 1h at 950 ℃, the heating rate and the cooling rate of a furnace are both 10-15 ℃/min, and the properties of the sample piece obtained in the embodiment 2 are as follows: density 98.9%, hardness 92N/mm2Conductivity 5.2X 107Ω-1·m-1the thermal conductivity was 215W/mk, and the coefficient of friction was 0.05. The strength of the product is superior to that of the existing product.
example 3
the high-temperature wear-resistant composite material prepared in this embodiment 3 includes the following components in percentage by mass:
77.5% of electrolytic copper powder, 9.0% of flake graphite powder, 2% of short carbon fiber, 1.5% of fine alumina powder, 9.0% of coarse alumina powder and 1.0% of silicon carbide powder. The granularity of the electrolytic copper powder is 50 microns, the granularity of the crystalline flake graphite powder is 45 microns, the granularity of the fine alumina powder is 1 micron, the granularity of the coarse alumina powder is 80 microns, and the granularity of the silicon carbide powder is 50 microns.
firstly, preparing composite prealloy powder I of short carbon fiber and copper powder, which comprises the following components in percentage by mass: 96% of electrolytic copper powder and 4.0% of short carbon fiber. Carrying out high-energy ball milling treatment on the electrolytic copper powder and the short carbon fiber, wherein the ball milling rotation speed is 250 revolutions per minute, and the ball milling time is 8 hours; and finally, carrying out annealing heat treatment under the protection of hydrogen atmosphere, wherein the annealing temperature is 300 ℃, and the heat preservation time is 80min, so as to obtain the composite pre-alloyed powder I uniformly inlaid with the short carbon fibers.
Then preparing composite prealloying powder II of oxide particles and copper powder, wherein the composite prealloying powder II comprises the following components in percentage by mass: 96% of electrolytic copper powder and 4.0% of fine alumina powder. Carrying out high-energy ball milling treatment on the electrolytic copper powder and the short alumina powder, wherein the ball milling rotation speed is 250 revolutions per minute, and the ball milling time is 12 hours; and finally, carrying out annealing heat treatment under the protection of hydrogen atmosphere, wherein the annealing temperature is 400 ℃, and the heat preservation time is 60min, thus obtaining the composite pre-alloy powder II uniformly embedded with the alumina particles.
Adding the electrolytic copper powder, the composite pre-alloy powder I, the composite pre-alloy powder II, the graphite powder and the like which are prepared according to a certain proportion into a V-shaped mixer, adding 1 wt% of kerosene according to the total mass, mixing for 6 hours, and drying to obtain mixed powder. And then cold pressing the mixed powder at room temperature, wherein the pressing pressure is 450MPa, the pressure maintaining time is 20s, the prepared copper-based composite material pressed blank is subjected to pressure sintering under the protection of hydrogen atmosphere, the pressed blank is sintered for 2h at 950 ℃, the heating rate and the cooling rate of a furnace are both 10-15 ℃/min, and the properties of the sample piece obtained in the embodiment 3 are as follows: density 98.2%, hardness 93N/mm2Conductivity 5.3X 107Ω-1·m-1The thermal conductivity was 220W/mk, and the coefficient of friction was 0.04. The strength of the product is superior to that of the existing product.
the data show that the copper-based composite material prepared by the material disclosed by the invention is excellent in strength, electric conductivity, heat conductivity and wear resistance and low in friction coefficient.
Claims (6)
1. a high-temperature wear-resistant composite material is characterized in that: the high-temperature wear-resistant composite material comprises the following raw materials in percentage by mass:
1.0-3.0% of short carbon fiber;
0.5-1.0% of fine ceramic particles;
1.5 to 10.0 percent of coarse ceramic particles;
6.0-15.0% of graphite powder;
the balance of copper powder;
the particle size of the fine ceramic particles is 1-5 microns, and the particle size of the coarse ceramic particles is 20-200 microns; the particle size of the graphite powder is 80-150 microns;
The high-temperature wear-resistant composite material is prepared by the following steps:
step one
Preparing composite prealloying powder I and composite prealloying powder II;
The preparation of the composite pre-alloyed powder I comprises the following steps:
The following raw materials are prepared according to mass percentage;
94-98% of electrolytic copper powder;
2-6% of short carbon fiber;
The granularity of the electrolytic copper powder is 30-80 mu m;
The short carbon fiber is degummed short carbon fiber; the diameter is 7-10 μm, and the length is 1-4 mm;
Carrying out high-energy ball milling on the prepared raw materials to obtain composite pre-alloyed powder I uniformly embedded with short carbon fibers; annealing the composite pre-alloy powder I to obtain standby composite pre-alloy powder I; the rotating speed of the high-energy ball mill is 220-300 r/min, and the ball milling time is 6-14 h; the annealing temperature is 300-400 ℃, the time is more than or equal to 30min, and the annealing atmosphere is hydrogen atmosphere;
the preparation of the composite pre-alloyed powder II comprises the following steps:
The following raw materials are prepared according to mass percentage;
95-98% of electrolytic copper powder;
2-5% of fine ceramic particle alumina and/or zirconia;
the granularity of the electrolytic copper powder is 30-80 mu m;
Carrying out high-energy ball milling on the prepared raw materials to obtain spherical composite pre-alloy powder II uniformly embedded with oxide particles; annealing the spherical composite pre-alloy powder II to obtain standby composite pre-alloy powder II; the rotating speed of the high-energy ball mill is 220-300 r/min, and the time is 6-14 h; the annealing temperature is 300-400 ℃, the time is more than or equal to 30min, and the annealing atmosphere is hydrogen atmosphere;
Step two
taking coarse ceramic particles, graphite powder, copper powder, composite pre-alloy powder I and spherical composite pre-alloy powder II according to the design group distribution, and uniformly mixing to obtain mixed powder;
Step three
pressing and forming the mixed powder obtained in the step two to obtain a pressed blank;
Step four
Pressurizing and sintering the pressed compact obtained in the step three under the protective atmosphere to obtain a high-temperature wear-resistant composite material; the pressure sintering temperature is 850-950 ℃, and the pressure is 2-6 MPa;
The coarse ceramic particles are selected from at least one of alumina, zirconia, silicon carbide and silicon dioxide; the graphite powder is flake graphite powder.
2. A high temperature, wear resistant composite material according to claim 1; the method is characterized in that: the short carbon fiber is degummed short carbon fiber after annealing and degumming.
3. A high temperature, wear resistant composite material according to claim 1; the method is characterized in that:
When the composite pre-alloy powder I is prepared, the annealing time is controlled to be 30-90 min;
and when preparing the spherical composite prealloying powder II, controlling the annealing time to be 30-90 min.
4. A high temperature, wear resistant composite material according to claim 1; the method is characterized in that: in the second step, during material mixing, stirring the materials uniformly by a V-shaped mixer; the stirring speed of the V-shaped mixer is 80-120 r/min.
5. A high temperature, wear resistant composite material according to claim 1; the method is characterized in that: in the third step, the compression molding mode comprises cold pressing; the pressure of cold pressing is 250-450 MPa, and the pressure maintaining time is 20-30 min.
6. a high temperature, wear resistant composite material according to claim 1; the method is characterized in that: step four, the pressed compact obtained in the step three is subjected to pressure sintering in a protective atmosphere, then pressure relief is carried out, and cooling is carried out, so that the high-temperature wear-resistant composite material is obtained; the protective atmosphere is hydrogen atmosphere or nitrogen atmosphere; and during sintering, controlling the temperature to be 850-950 ℃, the time to be 1-4 h and the pressure to be 2-6 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711192609.3A CN107747070B (en) | 2017-11-24 | 2017-11-24 | High-temperature wear-resistant composite material and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711192609.3A CN107747070B (en) | 2017-11-24 | 2017-11-24 | High-temperature wear-resistant composite material and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107747070A CN107747070A (en) | 2018-03-02 |
| CN107747070B true CN107747070B (en) | 2019-12-13 |
Family
ID=61251721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711192609.3A Active CN107747070B (en) | 2017-11-24 | 2017-11-24 | High-temperature wear-resistant composite material and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107747070B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109570493B (en) * | 2019-01-15 | 2021-04-27 | 中南大学 | Composite powder of metal-metal carbide coated carbon particles and preparation method thereof |
| CN109675707B (en) * | 2019-01-15 | 2021-04-27 | 中南大学 | Application of soft metal in preparation of superfine carbon powder |
| CN109695007B (en) * | 2019-01-15 | 2020-01-21 | 中南大学 | Preparation method of metal-carbon composite material |
| CN109852830B (en) * | 2019-01-15 | 2020-06-09 | 中南大学 | Superfine carbide particle reinforced metal matrix composite material and preparation method thereof |
| CN109702211B (en) * | 2019-01-15 | 2021-03-12 | 中南大学 | Preparation method and application of superfine carbon powder |
| CN110343899B (en) * | 2019-07-31 | 2020-10-02 | 长春工业大学 | Double-size hard particle reinforced copper-based composite material and preparation method thereof |
| CN110372391A (en) * | 2019-08-14 | 2019-10-25 | 中国科学院上海硅酸盐研究所 | A kind of SiC/ graphite composite material and its preparation method and application |
| CN110453076B (en) * | 2019-08-26 | 2021-09-21 | 华南理工大学 | Method for preparing reclaimed copper alloy by recycling metal concentrate of waste circuit board |
| CN110434158B (en) * | 2019-08-26 | 2022-03-29 | 华南理工大学 | Process for preparing copper alloy powder by treating waste circuit board through mechanical and physical method |
| CN111299481B (en) * | 2019-11-19 | 2021-12-07 | 湖北坚丰科技股份有限公司 | Closed forging and pressing forming process for gear shaft of new energy automobile engine |
| CN117966053A (en) * | 2024-04-01 | 2024-05-03 | 成都工业学院 | Particle reinforced copper-based composite material and preparation method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1403863A (en) * | 1971-07-23 | 1975-08-28 | Atomic Energy Authority Uk | Metal powder suspensions |
| CN102978434A (en) * | 2012-12-13 | 2013-03-20 | 北京科技大学 | Short fiber-particle synergetically-reinforced copper-based composite material and preparation method thereof |
| CN105420643A (en) * | 2015-11-30 | 2016-03-23 | 成都众恒智合信息技术有限公司 | Preparing technology for copper base alloy material for bearing |
| CN105734461A (en) * | 2016-03-18 | 2016-07-06 | 苏州莱特复合材料有限公司 | Carbon fiber reinforced copper-based composite material and preparation method thereof |
| CN105778406A (en) * | 2016-03-18 | 2016-07-20 | 华南理工大学 | Automotive copper-based powder metallurgy composite friction material and manfuacturing method thereof |
| CN106048470A (en) * | 2016-08-12 | 2016-10-26 | 浙江新昌皮尔机械配件有限公司 | Preparation method for copper-based alloy material used for bearing |
-
2017
- 2017-11-24 CN CN201711192609.3A patent/CN107747070B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1403863A (en) * | 1971-07-23 | 1975-08-28 | Atomic Energy Authority Uk | Metal powder suspensions |
| CN102978434A (en) * | 2012-12-13 | 2013-03-20 | 北京科技大学 | Short fiber-particle synergetically-reinforced copper-based composite material and preparation method thereof |
| CN105420643A (en) * | 2015-11-30 | 2016-03-23 | 成都众恒智合信息技术有限公司 | Preparing technology for copper base alloy material for bearing |
| CN105734461A (en) * | 2016-03-18 | 2016-07-06 | 苏州莱特复合材料有限公司 | Carbon fiber reinforced copper-based composite material and preparation method thereof |
| CN105778406A (en) * | 2016-03-18 | 2016-07-20 | 华南理工大学 | Automotive copper-based powder metallurgy composite friction material and manfuacturing method thereof |
| CN106048470A (en) * | 2016-08-12 | 2016-10-26 | 浙江新昌皮尔机械配件有限公司 | Preparation method for copper-based alloy material used for bearing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107747070A (en) | 2018-03-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107747070B (en) | High-temperature wear-resistant composite material and preparation method thereof | |
| JP7164906B2 (en) | METHOD FOR PREPARATION OF METAL MATERIAL OR METAL COMPOSITE MATERIAL | |
| CN102011043B (en) | Preparation method of powder metallurgy material for train brake pad | |
| CN108018506B (en) | A kind of modified height of short carbon fiber rubs composite material and preparation method and application | |
| CN105803236B (en) | A kind of aluminum matrix composite of non-crystaline amorphous metal enhancing and preparation method thereof | |
| CN110923498B (en) | Copper-based powder metallurgy friction material containing metal carbide and metal oxide composite ceramic friction component and preparation method thereof | |
| CN107723500A (en) | A kind of graphene aluminum oxide mixing enhancement copper-base composite material and preparation method thereof | |
| CN104525949B (en) | A kind of copper-based composite friction material of high abrasion and preparation method thereof | |
| CN107488852B (en) | A kind of Laser Cladding in-situ synthesis ceramic phase enhances the preparation method of copper-based cladding layer | |
| CN103668012B (en) | A kind of enhancement type Cu-base composites and its preparation method and application | |
| CN111575524B (en) | Copper-based powder metallurgy brake pad friction block and preparation method thereof | |
| CN113564406A (en) | High-melting-point alloy reinforced copper-based powder metallurgy friction material and preparation method thereof | |
| CN113122840A (en) | Tough wear-resistant strengthening layer and preparation method thereof | |
| Cheng et al. | Influence mechanism of AlCoCrFeNi content on the wide temperature domain tribological properties of WC-based cemented carbides | |
| CN110257738A (en) | A kind of preparation method of ultra-fine carbon particle enhancing metal-base composites | |
| CN110695364B (en) | Motor train unit brake pad material and method for manufacturing same | |
| CN110893466B (en) | Graphene-titanium-aluminum-carbon composite wear-resistant material | |
| CN112342427A (en) | Molybdenum-aluminum-boron ceramic particle reinforced copper-based composite material, preparation method thereof and pantograph slide plate | |
| CN108823444B (en) | Short-process preparation method of copper-carbon composite material | |
| CN115386786B (en) | Method for enhancing bonding strength of ceramic particles and matrix | |
| CN114672712B (en) | Lamellar Mo2TiAlC2 toughened molybdenum-silicon-boron alloy and preparation method thereof | |
| CN110981489A (en) | TiNx-Ti3SiC2Composite material and preparation method thereof | |
| CN102430756B (en) | Method for manufacturing IMC (Intermetallic Compound) silicon nitride ceramic-based composite brake pad | |
| CN112760539B (en) | Modified titanium aluminum carbide composite material, preparation method and application | |
| CN103639404B (en) | A kind of Brake pad material for high-power wind turbine generator and preparation technology thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |