A kind of preparation method of silicon nitride, silicon carbide and titanium diboride foam ceramics
A technology of titanium diboride and foam ceramics, which is applied in the field of silicon carbide combined with titanium diboride foam ceramics and silicon nitride, can solve the problem of poor thermal shock resistance, the inability to meet the needs of continuous casting of large special steel castings, and the use temperature Low-level problems, to achieve the effect of excellent thermal shock resistance, light weight, and increased strength
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Embodiment 1
[0010] TiB 2 , silicon micropowder, and phenolic resin are mixed uniformly with a weight ratio of 40:40:20 and an additional concentration of 0.1wt% hydroxypropyl methylcellulose solution 40wt% to make a ceramic slurry, and then the ceramic slurry is impregnated in polyurethane On the foam, after drying, in a nitrogen atmosphere, slowly heat up at a temperature of 300 ° C ~ 1450 ° C for 20 hours, at a temperature of 1450 ° C for 5 hours, and then in a vacuum or argon atmosphere, at a temperature of 1700 ° C for 20 minutes to make nitriding Silicon, silicon carbide combined with titanium diboride foam ceramics.
[0011] The purity of the batching raw materials used in the experiment is industrial pure.
Embodiment 2
[0013] TiB 2 , microsilica powder, and phenolic resin are uniformly mixed with a weight ratio of 60:25:15 and an additional concentration of 0.2wt% hydroxypropyl methylcellulose solution 50wt% to make a ceramic slurry, and then the ceramic slurry is impregnated in polyurethane On the foam, after drying, slowly heat up for 60 hours at a temperature of 300°C to 1450°C in a nitrogen atmosphere, keep it at 1450°C for 8 hours, and then hold it at a temperature of 1730°C for 70 minutes in a vacuum or argon atmosphere to make nitriding Silicon, silicon carbide combined with titanium diboride foam ceramics.
[0014] The purity of the batching raw materials used in the experiment is industrial pure.
Embodiment 3
[0016] TiB 2 , silicon micropowder, and phenolic resin are uniformly mixed with a weight ratio of 88:10:2 and an additional concentration of 0.3wt% hydroxypropyl methylcellulose solution 60wt% to make a ceramic slurry, and then the ceramic slurry is impregnated in polyurethane On the foam, after drying, in a nitrogen atmosphere, slowly heat up at a temperature of 300°C~1450°C for 100 hours, keep at a temperature of 1450°C for 10 hours, and then hold at a temperature of 1750°C for 120 minutes in a vacuum or argon atmosphere to make silicon nitride , Silicon carbide combined with titanium diboride foam ceramics.
[0017] The purity of the batching raw materials used in the experiment is industrial pure.
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