原材料特性对SiC-TiB₂复合陶瓷性能的影响

来源期刊：中南大学学报(自然科学版)1998年第2期

论文作者：凌兴珠 徐振民

文章页码：47 - 50

关键词：SiC-TiB₂复合陶瓷;烧结助剂; TiB₂-SiC复合粉

Key words：SiC-TiB₂ composite ceramic; sintering aid; TiB₂-SiC composite powder

摘    要：以微米级α-SiC粉为原料,用常压烧结法制备SiC-15%TiB₂(体积分数)复合陶瓷.研究了原材料特性如烧结助剂种类、增韧相类型和原料SiC粉粒度对材料性能和显微组织的影响.结果表明,Al-B-C是SiC-TiB₂复合陶瓷的有效烧结助剂.用它为助剂制备的陶瓷其相对密度和抗弯强度高于以B-C,Al-C和Si-C为助剂的SiC陶瓷.与纯TiB₂粉末相比,以TiB₂-SiC复合粉为增韧相的复合陶瓷性能改善,且抗氧化性较好.SiC原料粉末的粒度是影响SiC可烧结性最重要的因素.粒度愈细,SiC陶瓷的相对密度和抗弯强度愈高.

Abstract: Pressurelessly sintered SiC-15%TiB₂ (volume fraction) composite ceramics were fabricated by using micrometer grade SiC raw powder.Effects of raw material characteristics such as kinds of sintering aids, type of toughening phase and particle size of SiC powder on properties and microstructure of the composite ceramics were investigated in this paper.The results indicate that Al-B-C addition is an effective sintering aid of SiC-TiB₂ composite ceramics.The relative density and flexural strength of ceramics fabricated with added Al-B-C aid are higher than those of ceramics with added B-C,Al-C and Si-C aid respectively.The properties of composite ceramic made from TiB₂-SiC composite powder as a toughening phase were improved as compared with pure TiB₂ powder.Particle size of SiC raw powder is the most important factor to sintering ability of SiC ceramics.The finer SiC powder,the higher the relative density and flexural strength of ceramics.