【摘要】 以煤沥青为碳源，h-BN、Si₃N₄和h-BN/Si₃N₄陶瓷颗粒分别为掺杂中心，经机械搅拌混合后进行半焦化处理，获得具有炭包覆陶瓷颗粒的复合压粉。复合压粉经等静压成型和高温热处理后最终制备出具有核壳结构的炭基陶瓷复合材料（CCM）。研究了陶瓷颗粒类型对CCM性能和微观组织的影响。结果表明，与传统方法制备的CCM相比，炭包覆陶瓷颗粒有利于CCM结构致密均匀，抗弯强度达到72.31 MPa、抗压强度达到168.77 MPa,并且抗氧化性能显著提升。此外，该结构还提高了h-BN/Si₃N₄在协同作用下形成的陶瓷层的高温抗氧化性，更好地抑制CCM在1 400℃下的氧化。更多还原

【Abstract】 High performance carbon-based ceramic materials（CCM） were self-sintered by using green ceramic coke with core-shell structure which was prepared from coal tar pitch as carbon source and ceramic particles(h-BN,Si₃N₄ and h-BN/Si₃N₄) as doping center by the pressure-assisted semi-carbonization method.The effect of the ceramic types on the properties and microstructure of CCM was also investigated.Results showed that, compared to conventional methods, the core-shell structure can ensure the CCM to have a dense and homogeneous structure and prominent properties such as high bending strength of 72.31 MPa, remarkable compressive strength of 168.77 MPa, and outstanding oxidation resistance.In addition, the high-temperature oxidation resistance of the ceramic layer formed under the synergistic effect of h-BN/Si₃N₄ is improved, which can better inhibit its oxidation at 1 400 ℃.更多还原