Preparation method of aluminum-based composite material
An aluminum-based composite material and aluminum powder technology, which is applied in the field of electronic packaging materials, can solve the problems of affecting performance, composite material strength and large difference in expansion coefficient, etc., and achieve improved heat dissipation, strong material design, and reduced material deformation Effect
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Embodiment 1
[0033] A method for preparing an aluminum-based composite material, comprising the steps of:
[0034] (1) SiO 2 After mixing with carbon fiber at a mass ratio of 3:1, add SiO 2 and expanded graphite powder with 6% of the total mass of carbon fibers, and SiO 2 and 0.8% Al in total carbon fiber mass 2 o 3 , under an argon protective atmosphere, sintered at 1600°C for 20h to obtain a mixture of SiC particles and carbon fibers coated with SiC on the surface, which is designated as mixture 1;
[0035] (2) The mixture 1 in step (1) is sintered in air for 0.5 h, the sintering temperature is 1200° C., and the carbon fibers not covered by SiC in the mixture 1 are removed to obtain the mixture 2. The surface of the mixture 2 forms a plurality of microstructures. holes and silicon oxide layer;
[0036] (3) Mix the mixture 2 of step (2) with Si flakes at a volume ratio of 0.5:1, put them in a drum mill for 10 hours, and then sinter at 1450°C for 12 hours under an argon protective atm...
Embodiment 2
[0043] A method for preparing an aluminum-based composite material, comprising the steps of:
[0044] (1) SiO 2 After mixing with carbon fiber at a mass ratio of 3.2:1, add SiO 2 and expanded graphite powder with a total mass of carbon fibers of 6.8%, and SiO 2 and 1.5% Al in total carbon fiber mass 2 o 3 , under an argon protective atmosphere, sintered at 1720 ° C for 18 hours to obtain a mixture of SiC particles and carbon fibers coated with SiC on the surface, which is designated as mixture 1;
[0045] (2) The mixture 1 of step (1) is sintered in air for 2 hours, the sintering temperature is 1100°C, and the carbon fibers not covered by SiC in the mixture 1 are removed to obtain the mixture 2, and the surface of the mixture 2 forms a plurality of micropores and silicon oxide layer;
[0046] (3) Mix the mixture 2 of step (2) with the Si sheet at a volume ratio of 1:1, place it in a roller ball mill for 8.5 hours, and then sinter at 1460°C for 10 hours under an argon prot...
Embodiment 3
[0053] A method for preparing an aluminum-based composite material, comprising the steps of:
[0054] (1) SiO 2 After mixing with carbon fiber at a mass ratio of 3.4:1, add SiO 2 and expanded graphite powder with a total mass of carbon fibers of 7.5%, and SiO 2 and 1.4% Al in total carbon fiber mass 2 o 3 , under an argon protective atmosphere, sintered at 1850 ° C for 16 hours to obtain a mixture of SiC particles and carbon fibers coated with SiC on the surface, which is designated as mixture 1;
[0055] (2) The mixture 1 of step (1) is sintered in air for 4 hours, the sintering temperature is 950°C, and the carbon fibers not covered by SiC in the mixture 1 are removed to obtain the mixture 2, and the surface of the mixture 2 forms a plurality of micropores and silicon oxide layer;
[0056] (3) Mix the mixture 2 of step (2) with the Si sheet at a volume ratio of 1.5:1, put it in a roller ball mill for 7 hours, and then sinter at 1470°C for 8 hours under an argon protecti...
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