氮化硅陶瓷中压注塑成型技术(MPIM)研究及进展  

Research and Development of Medium Pressure Injection Molding Technology(MPIM)of Silicon Nitride Porcelain

作　　者：李镔[1] 张伟儒 韦中华[1] 王子诚[2] 陈波 LI Bin;ZHANG Weiru;WEI Zhonghua;WANG Zicheng;CHEN Bo(Beijing Sinoma Synthetic Crystals Co.,Ltd,Beijing 100018,China;Sinoma Advanced Nitride Ceramics Co.,Ltd,Zibo 255000,Shandong,China;Sinoma Advanced Materials Co.,Ltd,Beijing 100102,China)

机构地区：[1]北京中材人工晶体研究院有限公司,北京100018 [2]中材高新氮化物陶瓷有限公司,山东淄博255000 [3]中材高新材料股份有限公司,北京100102

出　　处：《中国陶瓷工业》2021年第1期27-37,共11页China Ceramic Industry

摘　　要：首次采用中压注塑成型技术(MPIM)制得性能优良的氮化硅轴承球。研究了粘结剂配方、注塑成型、低缺陷排胶、气氛压力烧结等工艺参数对氮化硅轴承球致密度、力学性能、表面与微观形貌的影响。结果表明,喂料固含量55.51%、注塑速率5 cm/s、注塑温度90℃、注塑实际压力75 bar、超临界CO2萃取+热脱脂两步法排胶等工艺过程有效控制了氮化硅坯体的缺陷,制得了生坯致密度58.7%、烧结密度3.26 g/cm3、烧结致密度99.4%、抗弯强度843 MPa、无缺陷的氮化硅轴承球。MPIM是未来注塑成型技术发展的重点方向,具有广泛的应用前景。The medium-pressure injection molding technology(MPIM)was applied to produce silicon nitride bearing balls with excellent performance for the first time.The effects of binder recipe,injection molding,low-defect debinding,and gas pressure sintering on the compactness,mechanical properties,surface and micro-morphology of Silicon Nitride bearing balls were studied.The results show while the solid content of the feedstock is 55.51%,the injection rate is 5 cm/s,the injection temperature is 90℃,the actual injection pressure is 75 bar,and the debinding process is two-step debinding of supercritical CO2 extraction+thermal debinding,the defects of Silicon Nitride balls are effectively controlled.Defect-free Silicon nitride bearing balls with 58.7%green body compactness,3.26 g/cm3 sintering density,99.4%sintering compactness,843 MPa flexure strength are produced.MPIM,holding widespread prospect of application,is an important direction of injection molding technology development in the future.

关 键 词：中压注塑成型技术 氮化硅轴承球 低缺陷排胶 致密度 力学性能 

分 类 号：TQ174.75[化学工程—陶瓷工业]