摘要
采用放电等离子烧结法,在烧结温度为1700~2000℃,升温速率为75~150℃/min,保温3~10 min条件下制备ZrB2-MoSi2-SiC复合陶瓷(ZMS15陶瓷),研究烧结温度、升温速率和保温时间等工艺参数对材料致密度以及1200℃高温抗氧化性能的影响。结果表明:ZrB2-MoSi2-SiC复合陶瓷的致密度随烧结温度升高和升温速率增大而增大,保温时间为7 min时致密度最大。ZMS15陶瓷高温氧化时形成双层结构的氧化层,外层为玻璃态SiO2层,内层为颗粒状富ZrO2层。随烧结温度升高,材料的抗氧化性能增强。ZrB2-MoSi2-SiC复合陶瓷的最佳SPS工艺为烧结温度2000℃、升温速率125℃/min、保温时间7 min,所得陶瓷的相对密度大于98.5%,在1200℃氧化72 h后的质量增加率小于8 mg/cm^2。
ZrB2-MoSi2-SiC composite ceramics(ZMS15 ceramics)were prepared by spark plasma sintering(SPS)at the sintering temperature of 1700−2000℃,heating rate of 75−150℃/min and holding time of 3−10 min.The effects of sintering temperature,heating rate and holding time on the relative density and the oxidation resistance at 1200℃of the composite ceramics were studied.The results show that the relative density of ZrB2-MoSi2-SiC composite ceramics increases with the increase of sintering temperature and heating rate,and the relative density reaches the maximum value when the holding time is 7 min.ZMS15 ceramic forms a double-layer structure during oxidation.The outer layer is glassy SiO2 layer,and the inner layer is granular ZrO2 layer.With increasing sintering temperature,the high temperture oxidation resistance of the material increases.The optimal SPS process for ZrB2-MoSi2-SiC composite ceramics is sintering temperature of 2000℃,heating rate of 125℃/min,and holding time of 7 min.The relative density of the ceramics is greater than 98.5%,and the mass change is less than 8 mg/cm2 after oxidation at 1200℃for 72 h.
作者
张玉栋
李继文
王南南
潘昆明
张亮亮
ZHANG Yudong;LI Jiwen;WANG Nannan;PAN Kunming;ZHANG Liangliang(Material Science&Engineering School,Henan University of Science&Technology,Luoyang 471023,China;National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials,Luoyang 471003,China)
出处
《粉末冶金材料科学与工程》
EI
北大核心
2020年第6期505-512,537,共9页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金资助项目(51901069)。
