Alumina composite ceramic containing core-shell structure composite toughening phase and preparation method thereof: Fid-Bau Portal

Alumina composite ceramic containing core-shell structure composite toughening phase and preparation method thereof

ZHANG ZHIXIAO / SHI YINGJIE / ZHANG XIAORONG / LI WEIXING

The invention relates to aluminum oxide composite ceramic containing a core-shell structure composite toughening phase and a preparation method of the aluminum oxide composite ceramic. According to the composite ceramic, aluminum oxide (Al2O3) is used as a matrix phase, a titanium boride-coated boron carbide (B4C-coated TiB2) core-shell structure unit is used as a composite toughening phase, the matrix phase accounts for 80%-95% by weight, and the composite toughening phase accounts for 5%-20% by weight. The preparation method of the composite ceramic comprises the following steps: preparing B4C-coated TiB2 composite powder with a core-shell structure from B4C and TiH2 as raw materials through a molten salt method, mixing the B4C-coated TiB2 composite powder with Al2O3 powder, and carrying out a pressure-assisted rapid sintering technology to obtain the composite ceramic. According to the composite ceramic, a high-hardness B4C-coated TiB2 core-shell structure unit is used as a composite toughening phase, and the limitation that the existing Al2O3 composite ceramic takes an independent phase as a toughening phase is broken through, so that the fracture toughness of the Al2O3 composite ceramic is greatly improved while the hardness of Al2O3 is improved.

本发明涉及一种含有核壳结构复合增韧相的氧化铝复合陶瓷及其制备方法。该复合陶瓷以氧化铝(Al2O3)为基体相，硼化钛包裹碳化硼(B4C@TiB2)核壳结构单元作为复合增韧相，按重量百分比计，基体相占比80％～95％，复合增韧相占比5％～20％。该复合陶瓷先以B4C和TiH2为原料通过熔盐法制备出具有核壳结构的B4C@TiB2复合粉体，再将该B4C@TiB2复合粉体与Al2O3粉体混合，由压力辅助快速烧结技术制备而得。该复合陶瓷用高硬度的B4C@TiB2核壳结构单元作为复合增韧相，突破了目前Al2O3复合陶瓷以独立物相作为增韧相的局限性，从而在提升Al2O3硬度的同时大幅度提高其断裂韧性。

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