A combined binder for preparing silicon carbide powder sintered porous body and its application method
A silicon carbide powder and binder technology, applied in the chemical field, can solve the problems of high strength, high temperature resistance, and low bonding strength of silicon carbide porous bodies, and achieve easy removal at low temperature, good high temperature resistance, and high The effect of intensity
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Embodiment 1
[0012] Dissolve aluminum hydroxide powder in 85% concentrated phosphoric acid at 140°C to obtain aluminum metaphosphate with a phosphorus-to-aluminum ratio of 23, add water and dilute to 5000 ml to obtain an aluminum metaphosphate solution with a concentration of 0.007 g / ml, add it to 7000 g In 10μm silicon carbide powder, stir evenly, dry at 200°C for 24 hours, pass through a 200 mesh sieve, add 1000 ml of polyvinyl alcohol aqueous solution with a concentration of 0.14 g / ml, grind evenly, dry at 80°C for 24 hours, and sieve (200 In order to obtain a silicon carbide porous body, it was sintered at 800° C. for 3 h after compression molding.
Embodiment 2
[0014] Dissolve aluminum hydroxide powder in 85% concentrated phosphoric acid at 140°C to obtain aluminum metaphosphate with a phosphorus-aluminum ratio of 23, add water and dilute to 5000 ml to obtain an aluminum metaphosphate solution with a concentration of 0.014 g / ml, add it to 7000 g In 10μm silicon carbide powder, stir evenly, dry at 200°C for 24 hours, pass through a 200 mesh sieve, add 1000 ml of polyvinyl alcohol aqueous solution with a concentration of 0.105 g / ml, grind evenly, dry at 80°C for 24 hours, and sieve (200 mesh), after compression molding, sintering at 800°C for 3h to obtain porous SiC
Embodiment 3
[0016] Dissolve aluminum hydroxide powder in 85% concentrated phosphoric acid at 140°C to obtain aluminum metaphosphate with a phosphorus-to-aluminum ratio of 23, add water and dilute to 5000 ml to obtain an aluminum metaphosphate solution with a concentration of 0.028 g / ml, add it to 7000 g In 10μm silicon carbide powder, stir evenly, dry at 200°C for 24 hours, pass through a 200 mesh sieve, add 1000 ml of polyvinyl alcohol aqueous solution with a concentration of 0.07 g / ml, grind evenly, dry at 80°C for 24 hours, and sieve (200 mesh), and then sintered at 800°C for 3 hours to obtain a silicon carbide porous body.
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