气相SiO反应渗透制备生物形态SiC多孔陶瓷  

FABRICATION OF BIO-MORPHOLOGY SiC POROUS CERAMICS BY SiO VAPOR REACTION INFILTRATION

作　　者：李翠艳[1] 黄剑锋[1] 卢靖[1] 杨长安[1] 

机构地区：[1]陕西科技大学材料科学与工程学院,陕西西安710021

出　　处：《陕西科技大学学报（自然科学版）》2008年第2期38-41,共4页Journal of Shaanxi University of Science & Technology

基　　金：教育部博士点基金(20070708001);陕西科技大学自然科学基金(ZX07-15)

摘　　要：以毛竹为原材料,碳化后制得竹炭为模板,采用气相SiO反应渗透法制备了生物形态SiC多孔陶瓷.利用XRD、SEM和万能力学试验机等测试手段对生物形态SiC多孔陶瓷的物相组成、微观形貌及力学性能进行了分析,探讨了气相SiO渗透制备生物形态SiC多孔陶瓷的形成过程.结果表明:SiC多孔陶瓷由主晶相-βSiC和少量未反应的C组成,其微观结构遗传了竹材的孔隙结构特征.随着反应温度的升高,SiC的转化率提高,SiC多孔陶瓷的抗弯强度降低.在SiC的形成过程中,气相SiO通过SiC层的扩散是其生长的控制步骤.Bio-morphology SiC porous ceramics was fabricated by the reaction infiltration of SiO vapor with the carbonized bamboo. The phase, morphology and mechanical properties of the SiC porous ceramics were analyzed. The results show that the bio-morphology SiC porous ceramics is mainly composed by β-SIC and its morphology inherits the bamboo templates. With the elevating of the reaction temperature, the conversion ratio of SiC increase and the flexure stress decrease. The diffusion of SiO through the initial SiC layer controls the growth of the SiC.

关 键 词：竹炭 SIC多孔陶瓷 微观形貌 抗弯强度 

分 类 号：TB321[一般工业技术—材料科学与工程]