氧化锆基金属陶瓷放电等离子烧结制备与性能研究

Study on the Synthesis and Properties of Zirconia Based Metal Ceramics by Spark Plasma Sintering

氧化锆陶瓷材料的脆性限制了其在某些领域的应用。文章首创在氧化锆粉末中加入316L不锈钢粉,通过放电等离子烧结制备氧化锆基金属陶瓷。试验通过不同的成分配比和不同的烧结温度进行对比研究,采用金相分析、XRD、SEM/EDS等测试方法,对材料的微观结构和宏观性能等进行了表征与分析。并通过断口分析,讨论了Zr O2·316L金属陶瓷的增韧机理。结果表明:采用放电等离子烧结制备出的材料随相组成的成分所占比例的改变,其致密度、弯曲强度、横向断裂强度、断裂韧性都随之呈现出相应的变化规律;316L相以片状均匀分布在氧化锆基体中,在材料断裂时起到了颗粒/纤维增韧的作用。同时氧化锆部分以亚稳相t-Zr O2的形态存在,也起到了相变增韧的作用。

Because of the brittleness of zirconia ceramic material,which limits its application in some areas. Therefore,this study proposes adding 316 L stainless steel powder in zirconia powder form Zr O2·316L composite powder,and through spark plasma sintering technology. The experiment uses a different composition ratio and different sintering temperatures for comparative studies,used metallurgical analysis,XRD,SEM / EDS and other means of detection,the microstructure and macroscopic properties of the material,such as a detailed analysis. And through the fracture analysis of the material discussed toughening mechanism Zr O2·316L metal ceramics. The following conclusions： using materials prepared by spark plasma sintering had good density,SPS process highlighted a number of distinct advantages in the sintering process and unique position. Within a certain range,with increasing sintering temperature and 316 L phase content increases,density,hardness and flexural strength with the change rule. Meanwhile zirconia partly metastable phase t-Zr O2 forms exist,also played a role in the phase transformation toughening.