摘要
使用有机锆前驱体(POZ)和聚碳硅烷(PCS)作为前驱体,通过前驱体浸渍-裂解工艺(PIP)制备了C/C-ZrC-SiC复合材料。采用热重分析仪、X射线衍射、扫描电子显微镜等手段研究了Zr-Si混合前驱体的裂解过程中的热失重行为、物相转化过程及显微组织,并详细分析了复合材料的微观结构和烧蚀行为。结果表明:将Zr-Si混合前驱体从室温加热至1 200℃时,ZrC首先转化为无机态的ZrO_2,当裂解温度升高至1 600℃时,ZrO_2通过碳热还原反应生成ZrC陶瓷;SiC晶体的转变温度为1 200～2 000℃。对C/C-ZrC-SiC复合材料烧蚀后的显微组织观察表明,所制备的复合材料具有良好的耐烧蚀性能。
C/C-ZrC-SiC composites were prepared by precursor infiltration and pyrolysis using poly-meric organic zirconium precursor(POZ)and polycarbosilane(PCS)as precursor.Thermogravimetric behavior,phase conversion and microstructure of Zr-Si mixed precursors during pyrolysis were studied by thermal gravimetric analyzer,X-ray diffraction and scanning electron microscope,and the microstructure and ablation behavior of the composites were analyzed in detail.The results indicate that when Zr-Si mixed precursors is heated from room temperature to 1 200℃,ZrC precursor transforms to inorganic ZrO2.When the pyrolysis temperature rises to 1 600℃,ZrO2 can be reduced to ZrC ceramics by carbothermal reduction reaction.The transition temperature of the SiC crystal is 1 200~2 000℃.The microstructure of the C/C-ZrC-SiC composites after ablation shows that the prepared composites exhibit good ablation resistance.
作者
刘春轩
曹柳絮
黄启忠
LIU Chun-xuan;CAO Liu-xu;HUANG Qi-zhong(Hunan Xiangtou Goldsky Science and Technology Group Co.,Ltd.,Changsha 410205,China;Powder Metallurgy Reseach Institute,Central South University,Changsha 410083,China)
出处
《稀有金属与硬质合金》
CAS
CSCD
北大核心
2019年第2期22-29,62,共9页
Rare Metals and Cemented Carbides
作者简介
通讯作者:刘春轩(1983-),博士,中级工程师,研究方向为轻金属基复合材料、碳陶复合材料等,E-mail:liuchunxuan315@126.com.
