CAJ | 학술논문

以富硼碳化硼粉体为原料,采用放电等离子烧结(SPS)制备致密碳化硼陶瓷体,研究了SPS工艺对碳化硼陶瓷结构和性能的影响.结果表明,SPS烧结工艺可以低温快速烧结得到致密度达到99.7%的碳化硼陶瓷体,烧结温度和烧结时间对碳化硼的致密度和晶粒尺寸都有影响.烧结过程中样品晶粒表面产生玻璃相,玻璃相的存在使碳化硼断裂机制由穿晶断裂过渡为沿晶断裂,有助于提高材料断裂强度和断裂韧性.SPS制备的致密碳化硅陶瓷材料具有良好的力学性能,其中致密度达到99.6%,抗弯强度达到550.1 MPa,硬度39.52 GPa.
이부붕탄화붕분체위원료,채용방전등리자소결(SPS)제비치밀탄화붕도자체,연구료SPS공예대탄화붕도자결구화성능적영향.결과표명,SPS소결공예가이저온쾌속소결득도치밀도체도99.7%적탄화붕도자체,소결온도화소결시간대탄화붕적치밀도화정립척촌도유영향.소결과정중양품정립표면산생파리상,파리상적존재사탄화붕단렬궤제유천정단렬과도위연정단렬,유조우제고재료단렬강도화단렬인성.SPS제비적치밀탄화규도자재료구유량호적역학성능,기중치밀도체도99.6%,항만강도체도550.1 MPa,경도39.52 GPa.
Densified boron carbide ceramics were synthesized by a spark plasma sintering(SPS) process using boron-rich boron carbide powders as the raw material. The influence of SPS experimental parameters on the structure and mechanical properties of boron carbide ceramics was investigated. It showed that boron carbide having a densification of 99.7% was obtained by SPS at a relatively low temperature for a short dwell time. Sintering temperature and time affected the densification and the grain size of boron carbides. Amorphous phase formed on the grain surface during sintering, which would lead to a transition of the fracture type of boron carbides from transgranular to intergranular. As a result, amorphous phase helped an increase in fracture strength and fracture toughness. Boron carbide ceramics synthesized by SPS exhibited excellent mechanical properties, i.e., densification was 99.6%, bending strength was 550.1 MPa, and Vickers hardness was up to 39.52 GPa, respectively.