Preparation method of high-density silicon carbide composite
A composite material and silicon carbide technology, which is applied in the field of composite material processing, can solve the problems of material uniformity, low repeatability index of weibull modulus, reduced machinability and application reliability, and low room temperature strength of SiC ceramics, etc., to achieve improvement Effects of quality stability and strength, increased raw material cost, and shortened degreasing cycle
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Embodiment 1
[0029] In this embodiment, the preparation method of the high-density silicon carbide composite material includes the following steps:
[0030] 1), the main material is passed through a 70-mesh sieve after primary ball milling in water accounting for 22% of the total main material (add 0.3 parts by weight of a dispersant and perform secondary ball milling) to obtain a finished slurry, wherein the main material includes 50 parts by weight of SiC pellets and 0.4 parts by weight B 4 C pellets, B 4 C pellets are used as sintering aids, the particle size of SiC pellets is 0.8μm, B4 The size of the C pellets was 3.0 μm.
[0031] 2), add auxiliary materials to the finished slurry product obtained in step 1) to prepare the slurry before casting (add methylenebisacrylamide first, then adjust the pH of the slurry to 10-11 with tetramethylammonium hydroxide, and then Add ammonium polyacrylate), keep stirring when adding, wherein the auxiliary materials include acrylamide, methylenebisa...
Embodiment 2
[0037] In this embodiment, the preparation method of the high-density silicon carbide composite material includes the following steps:
[0038] 1), the main ingredient is passed through a 65-mesh sieve after primary ball milling in water accounting for 23% of the total amount of the main ingredient (add 0.3 parts by weight of a dispersant and perform secondary ball milling) to obtain a finished slurry, wherein the main ingredient includes 48 parts by weight of SiC pellets and 0.4 parts by weight B 4 C pellets, B 4 C pellets are used as sintering aids, the particle size of SiC pellets is 0.7μm, B 4 The size of the C pellets was 3.1 μm.
[0039] 2), add auxiliary materials to the finished slurry product obtained in step 1) to prepare the slurry before casting (add methylenebisacrylamide first, then adjust the pH of the slurry to 10-11 with tetramethylammonium hydroxide, and then Add ammonium polyacrylate), keep stirring when adding, wherein the auxiliary materials include acr...
Embodiment 3
[0044] In this embodiment, the preparation method of the high-density silicon carbide composite material includes the following steps:
[0045] 1), the main ingredient is passed through a 75-mesh sieve after a ball mill in water accounting for 24% of the total amount of the main ingredient (add 0.1-0.4 parts by weight of a dispersant and carry out secondary ball milling) to obtain a finished slurry, wherein the main ingredient includes 52 wt. Parts of SiC pellets and 0.6 parts by weight of B 4 C pellets, B 4 C pellets are used as sintering aids, the particle size of SiC pellets is 0.75 μm, B 4 The size of the C pellets was 2.9 μm.
[0046] 2), add auxiliary materials to the finished slurry product obtained in step 1) to prepare the slurry before casting (add methylenebisacrylamide first, then adjust the pH of the slurry to 10-11 with tetramethylammonium hydroxide, and then Add ammonium polyacrylate), keep stirring when adding, wherein the auxiliary materials include acrylam...
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