Superhigh-temperature SiC-HfB2 composite ceramic and preparation method and application thereof
A composite ceramic, sic-hfb2 technology, applied in the field of ceramic materials, can solve the problems of performance evaluation, powder particle growth, composite material performance to be studied, etc., to improve high temperature performance and oxidation resistance, high purity, Excellent antioxidant effect
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Embodiment 1
[0031] 1. SiC (powder purity 99.9%, particle size 1μm), HfO 2 (powder purity 99.9%, particle size 1μm), Ta 2 o 5(powder purity 99%, particle size 1 μm) and amorphous boron powder (purity 95.6%, particle size 1 μm) as raw materials, SiC powder, HfO 2 Powder, Ta 2 o 5 The molar ratio of the powder is 39:10:1, amorphous boron powder and HfO 2 The molar ratio is 4:1, amorphous boron powder and Ta 2 o 5 The molar ratio of the mixture is 8.8:1, adding a solvent and a ball milling medium for mixing, mixing on a ball mill for 24 hours, and obtaining a mixed powder after drying.
[0032] 2. Put the molded green body of the mixed powder into a graphite crucible, raise the temperature to 1000°C at a rate of 15°C / min and keep it for 1h, and then raise the temperature to 1600°C at a rate of 10°C / min and keep it for 2h to obtain SiC- HfB 2 Powder.
[0033] 3. SiC-HfB 2 Put the powder into a graphite mold, use spark plasma sintering to heat up to 1400°C at a rate of 150°C / min, fill...
Embodiment 2
[0036] 1. SiC (powder purity 99.9%, particle size 2μm), HfO 2 (powder purity 99.9%, particle size 2μm), Ta 2 o 5 (Powder purity 99%, particle size 2μm) and amorphous boron powder (purity 95.6%, particle size 2μm) as raw materials, SiC powder, HfO 2 Powder, Ta 2 o 5 The molar ratio of powder is 39.2:10:0.8, amorphous boron powder and HfO 2 The molar ratio is 4:1, amorphous boron powder and Ta 2 o 5 The molar ratio is 8.8:1, adding solvent and ball milling medium for mixing, mixing on a ball mill for 24 hours, and obtaining mixed powder after drying.
[0037] 2. Put the molded green body of the mixed powder into a graphite crucible, raise the temperature to 1000°C at a rate of 15°C / min and keep it for 1h, and then raise the temperature to 1500°C at a rate of 10°C / min and keep it for 2h to obtain SiC- HfB 2 Powder.
[0038] 3. SiC-HfB 2 Put the powder into a graphite mold, use spark plasma sintering to heat up to 1400°C at a rate of 150°C / min, fill with a protective atm...
Embodiment 3
[0041] 1. SiC (powder purity 99.9%, particle size 1μm), HfO 2 (powder purity 99.9%, particle size 1μm), Ta 2 o 5 (powder purity 99%, particle size 1 μm) and amorphous boron powder (purity 95.6%, particle size 2 μm) as raw materials, SiC powder, HfO 2 Powder, Ta 2 o 5 The molar ratio of the powder is 38.4:10:1.6, amorphous boron powder and HfO 2 The molar ratio is 4:1, amorphous boron powder and Ta 2 o 5 The molar ratio of the mixture is 8.8:1, adding a solvent and a ball milling medium for mixing, mixing on a ball mill for 24 hours, and obtaining a mixed powder after drying.
[0042] 2. Put the molded green body of the mixed powder into a graphite crucible, raise the temperature to 1100°C at a rate of 15°C / min and keep it for 2 hours, and then raise the temperature to 1600°C at a rate of 10°C / min and keep it for 2 hours to obtain SiC- HfB 2 Powder.
[0043] 3. SiC-HfB 2 Put the powder into a graphite mold, use spark plasma sintering to heat up to 1500°C at a rate of ...
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