Surface modified whisker reinforced copper-based composite material and preparation method thereof
A copper-based composite material and surface modification technology, which is applied in the field of surface-modified β-Si3N4 whisker-reinforced copper-based composite materials and its preparation, can solve the problem of reducing the purity of the metal matrix, reducing the functional characteristics of thermal conductivity and electrical conductivity, Obvious disadvantages and other issues
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[0037] Preparation of the composite powder (raw material powder): surface-modified β-Si 3 N 4 Whiskers and copper powder (or copper alloy powder) are mixed by ball milling for 3h-24h to obtain uniform and stable composite powder. The volume fraction of added whiskers is 1%-40%, and the volume fraction of copper powder (or copper-based alloy powder) is 60%-99%.
[0038] The matrix phase of the composite material is pure Cu or Cu alloy.
[0039] Surface Modified β-Si 3 N 4 Whiskers are the reinforcing phase of composite materials.
[0040] Preparation by hot pressing sintering The composite material is sintered at a temperature of 700°C-1000°C, a pressure of 5MPa-40MPa, and a holding time of 0.5h-4h. The atmosphere can be vacuum or an inert protective atmosphere.
[0041] The composite material is prepared by pressureless sintering, the sample is pre-pressed under a pressure of 5MPa~30MPa, and then cold isostatic pressing is carried out under a pressure of 100MPa~300MPa, an...
example 1
[0048] Configure 30ml of 50g / L glucose solution for use. Weigh AgNO 3 The mass is 2.48g, which is dissolved in 500ml of deionized water, and ammonia water is added dropwise until the solution is clear, and the silver ammonia solution is prepared. Weigh β-Si 3 N 4 3.3 g of whiskers were poured into the silver ammonia solution, placed on a magnetic stirrer and stirred to fully disperse the whiskers. , add the pre-configured glucose solution dropwise, and continue to stir the solution for 12h until the Ag ions are completely precipitated. Ag-coated β-Si was obtained by filtration 3 N 4 whiskers. Dry in an oven at 60°C and pass through a 100-mesh sieve;
[0049] Take the Ag-coated β-Si obtained above 3 N 4 Mix whiskers with 80.1g of pure copper powder with a median particle size of 15.2μm, add 40g of absolute ethanol, and ball mill for 3 hours to obtain a uniform and stable slurry. Dry at 50° C. to 80° C. for 2 hours, and sieve to obtain composite powder. Pour the powde...
example 2
[0051] Configure 60ml of 50g / L glucose solution for use. Weigh AgNO 3 The mass is 4.96g, dissolved in 1000ml of deionized water, and ammonia water is added dropwise until the solution is clear, and the silver ammonia solution is prepared. Weigh β-Si 3 N 4 3.3 g of whiskers were poured into the silver ammonia solution, placed on a magnetic stirrer and stirred to fully disperse the whiskers. , add the pre-configured glucose solution dropwise, and continue to stir the solution for 12h until the Ag ions are completely precipitated. Ag-coated β-Si was obtained by filtration 3 N 4 whiskers. Dry in an oven at 60°C and pass through a 100-mesh sieve;
[0052] Take the Ag-coated β-Si obtained above 3 N 4 Mix whiskers with 80.1g of pure copper powder with a median particle size of 15.2μm, add 40g of absolute ethanol, and ball mill for 3 hours to obtain a uniform and stable slurry. Dry at 50° C. to 80° C. for 2 hours, and sieve to obtain composite powder. Pour the powder into a...
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