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Ceramic material as well as preparation method and application thereof
The invention discloses a ceramic material as well as a preparation method and application thereof. A main phase of the ceramic material comprises cubic boron nitride, hexagonal boron nitride and rare earth oxide, the volume fraction of the hexagonal boron nitride is larger than that of the cubic boron nitride, and the elastic modulus gt of the ceramic material is larger than that of the cubic boron nitride; the pressure is 15 GPa, and the nanoindentation hardness of the ceramic material is not lower than 250 MPa. The preparation method comprises the following steps: 1) mixing cubic boron nitride and rare earth oxide to obtain rare earth doped cubic boron nitride mixed powder; and 2) carrying out hot pressed sintering on the mixed powder to promote the rare earth oxide to catalyze in-situ phase transformation of cubic boron nitride to hexagonal boron nitride so as to obtain the ceramic material. The method provided by the invention can effectively improve the density and mechanical properties of the ceramic material, and the ceramic material has good stability at high temperature. The ceramic material provided by the invention has strong mechanical properties and high density, and can be applied to the field of wave-transparent ceramics.
本发明公开了一种陶瓷材料及其制备方法和用途。所述陶瓷材料的主相包括立方氮化硼、六方氮化硼和稀土氧化物，所述六方氮化硼的体积分数大于所述立方氮化硼的体积分数，所述陶瓷材料的弹性模量>15GPa，所述陶瓷材料的纳米压痕硬度不低于250MPa。所述制备方法包括：1)将立方氮化硼和稀土氧化物混合后，得到稀土掺杂立方氮化硼的混合粉体；2)对所述混合粉体进行热压烧结，促使发生稀土氧化物催化立方氮化硼向六方氮化硼的原位相转变，得到所述的陶瓷材料。本发明的方法能够有效提高陶瓷材料的致密度和机械性能，该陶瓷材料在高温下具有良好的稳定性。本发明的陶瓷材料机械性能强，致密度高，可应用于透波陶瓷领域。
Ceramic material as well as preparation method and application thereof
The invention discloses a ceramic material as well as a preparation method and application thereof. A main phase of the ceramic material comprises cubic boron nitride, hexagonal boron nitride and rare earth oxide, the volume fraction of the hexagonal boron nitride is larger than that of the cubic boron nitride, and the elastic modulus gt of the ceramic material is larger than that of the cubic boron nitride; the pressure is 15 GPa, and the nanoindentation hardness of the ceramic material is not lower than 250 MPa. The preparation method comprises the following steps: 1) mixing cubic boron nitride and rare earth oxide to obtain rare earth doped cubic boron nitride mixed powder; and 2) carrying out hot pressed sintering on the mixed powder to promote the rare earth oxide to catalyze in-situ phase transformation of cubic boron nitride to hexagonal boron nitride so as to obtain the ceramic material. The method provided by the invention can effectively improve the density and mechanical properties of the ceramic material, and the ceramic material has good stability at high temperature. The ceramic material provided by the invention has strong mechanical properties and high density, and can be applied to the field of wave-transparent ceramics.
本发明公开了一种陶瓷材料及其制备方法和用途。所述陶瓷材料的主相包括立方氮化硼、六方氮化硼和稀土氧化物，所述六方氮化硼的体积分数大于所述立方氮化硼的体积分数，所述陶瓷材料的弹性模量>15GPa，所述陶瓷材料的纳米压痕硬度不低于250MPa。所述制备方法包括：1)将立方氮化硼和稀土氧化物混合后，得到稀土掺杂立方氮化硼的混合粉体；2)对所述混合粉体进行热压烧结，促使发生稀土氧化物催化立方氮化硼向六方氮化硼的原位相转变，得到所述的陶瓷材料。本发明的方法能够有效提高陶瓷材料的致密度和机械性能，该陶瓷材料在高温下具有良好的稳定性。本发明的陶瓷材料机械性能强，致密度高，可应用于透波陶瓷领域。
Ceramic material as well as preparation method and application thereof
一种陶瓷材料及其制备方法和用途
ZHANG WEIGANG (author) / QIAO JIAHAO (author) / SUN XIAOMING (author) / YANG HAIJUN (author)
2023-12-15
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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