A kind of preparation method of silicon nitride bonded silicon carbide foam ceramics
A technology of foam ceramics and silicon carbide, which is applied in the field of silicon nitride combined with silicon carbide foam ceramics, can solve the problems of continuous casting of large special steel castings, poor thermal shock resistance, and low service temperature, etc. Excellent thermal shock performance and enhanced strength
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Embodiment 1
[0010] Mix SiC, silicon micropowder, and phenolic resin in a weight ratio of 40:40:20 and add 0.1wt% hydroxypropyl methylcellulose solution 40wt% to make a ceramic slurry, and then impregnate the ceramic slurry On polyurethane foam, after drying, in a nitrogen atmosphere, slowly heat up at a temperature of 300°C~1450°C for 20 hours, keep at 1450°C for 5 hours, and then hold at a temperature of 1700°C for 20 minutes to make silicon nitride bonded silicon carbide foam ceramics.
[0011] The purity of the batching raw materials used in the experiment is industrial pure.
Embodiment 2
[0013] Mix SiC, silicon micropowder, and phenolic resin in a weight ratio of 60:25:15 and add 0.2wt% hydroxypropyl methylcellulose solution 50wt% to make a ceramic slurry, and then impregnate the ceramic slurry On polyurethane foam, after drying, in a nitrogen atmosphere, slowly heat up at a temperature of 300°C~1450°C for 60 hours, keep at 1450°C for 8 hours, and then hold at a temperature of 1730°C for 70 minutes to make silicon nitride bonded silicon carbide foam ceramics.
[0014] The purity of the batching raw materials used in the experiment is industrial pure.
Embodiment 3
[0016] Mix SiC, silicon micropowder, and phenolic resin at a weight ratio of 88:10:2 and add 0.3wt% hydroxypropyl methylcellulose solution 60wt% to make a ceramic slurry, and then impregnate the ceramic slurry On polyurethane foam, after drying, in a nitrogen atmosphere, slowly heat up at a temperature of 300°C~1450°C for 100 hours, keep at 1450°C for 10 hours, and then hold at a temperature of 1750°C for 120 minutes to make silicon nitride bonded silicon carbide foam ceramics.
[0017] The purity of the batching raw materials used in the experiment is industrial pure.
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