石英含量对刚玉基陶瓷型芯材料性能的影响.pdfVIP

学兔兔 铸 造 May2011 · 486· F0UNDRY VoI．60 N0。5 石英含量对刚玉基陶瓷型芯材料性能的影响 余建波·，王宝全t，曾宇平z，张英伟 ，邓 康 ，任忠鸣 (1．上海大学材料科学与工程学院上海市钢铁冶金新技术应用开发重点实验室，上海2130072； 2．中国科学院上海硅酸盐研究所，上海200050) 摘要：研究了石英含量对刚玉基陶瓷型芯强度、收缩率、气孔率和体积密度的影响。试验结果表明：在相同的烧结温 度下，随着石英含量的增加，型芯的抗弯强度、收缩率不断增大；相同siO 含量，型芯的抗弯强度、收缩率随烧结温 度的升高而增大；在相同的烧结温度下，随着SiO 含量的增多，样品的显气孔率先增加后减小，存在极值；同一成分 含量，当SiO 含量≤15％，随烧结温度的升高，样品的显性气孔率增加，而当SiO 为2O％，1 450℃烧结时型芯的显性气 孔率最大。SEM、XRD、EDS分析结果表明，玻璃相的生成和消耗关系是影响型芯显气孔率的重要因素。 关键词：钢玉基型芯；石英；抗弯强度；收缩率；气孑L率；体积密度 中图分类号：TG221 ．1；TQ174．75 文献标识码：A 文章编号：1001—4977(2ol1)05—0486—04 Effect of SiO2 on Property of Alumina-·Based Ceramic Core YU Jian—be’，WANG Bao-quan’，ZENG Yu-ping2,ZHANG Ying-wei’，DENG Kang’，REN Zhong-ming (1．Shanghai Enhanced Laboratory of Ferro—Metallurgy，Shanghai University,Shanghai 200072，China； 2．Shanghai Institute of Ceramics Chinese Academy of Sciences，Shanghai 200050，China) Abstract： The effect of Si02 content on the prope~y of alumina—based ceramic core was jnvestigated．The results show that the bending strength and shrinkage ratio of the core jncreased with the increase of Si0，content at the same sintering temperature or increased with the jncrease of sintering temperature at the same content of SiO2．The apparent porosity of the samples increased first，and then decreased with the inclease of Si02 content at the same sintering temperature．For the same content of SiO2，when the content of SiO2 iS no more than 1 5％，the apparent porosity of the samples increased with the increase of sintering temperature；when the content of Si02 iS 20％， the apparent porosity of the samples sintered at 1 4