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无机材料学报

无机材料学报 ›› 2012, Vol. 27 ›› Issue (3): 239-244.DOI: 10.3724/SP.J.1077.2012.00239 CSTR: 32189.14.SP.J.1077.2012.00239

• 研究论文 • 上一篇    下一篇

多孔铝基陶瓷型芯的制备及其性能

王宝全1,2, 余建波1, 任忠鸣1, 曾宇平2   

  1. (1. 上海大学 材料科学与工程学院, 上海市现代冶金和材料制备重点实验室, 上海200072; 2. 中国科学院 上海硅酸盐研究所, 高性能陶瓷和超微结构国家重点实验室, 上海200050)
  • 收稿日期:2011-03-16 修回日期:2011-07-15 出版日期:2012-03-20 网络出版日期:2012-02-16
  • 作者简介:王宝全(1987-), 男, 硕士研究生. E-mail: baoquan902@163.com
  • 基金资助:

    国家自然科学基金重点项目(50872142/ E0207, 50902140); 上海市重大专项课题(08DZ1130100)

Fabrication and Properties of Porous Alumina-based Ceramic Core

WANG Bao-Quan1,2, YU Jian-Bo1, REN Zhong-Ming1, ZENG Yu-Ping2   

  1. (1. Department of Material Science and Engineering, Shanghai University Key Lab of Modern Metallurgy and Processing of Materials, Shanghai 200072, China; 2. State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China)
  • Received:2011-03-16 Revised:2011-07-15 Published:2012-03-20 Online:2012-02-16
  • About author:WANG Bao-Quan. E-mail: baoquan902@163.com
  • Supported by:

    National Natural Science Foundation of China (50872142/E0207, 50902140); Shanghai Postdoctoral Sustentation Fund, China (08DZ1130100)

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摘要： 为了解决铝基陶瓷型芯难于烧结和不易脱芯的难题, 在样品中加入了一定量的SiO2. 利用干压法制备了多孔氧化铝基陶瓷型芯样品, 研究了不同SiO2的添加量、烧结温度和保温时间对样品性能的影响. 研究结果表明: 经1500℃烧结保温2 h和1600℃烧结降温2 h的样品, 其线收缩率变化不大. 经1700℃烧结保温2 h的样品, 由于SiO2的挥发导致样品的气孔率升高, 抗弯强度明显降低. 经1500℃烧结保温2 h的样品综合性能最好, 当SiO2添加量为10wt%时, 样品的线收缩率为1.1%, 抗弯强度为63 MPa, 气孔率为35.5%, 体积密度为2.29 g/cm3; 当保温时间≥4 h时, 其线收缩率、抗弯强度、气孔率和体积密度变化不大, 有望成为高温型芯的候选材料.

关键词: 多孔, 铝基陶瓷型芯, 线收缩率, 抗弯强度, 显气孔率, 体积密度

Abstract: Considering the difficulty of sintering and leachability of alumina-based ceramic core, different contents of silica were added to the specimens. The porous alumina-based ceramic core was prepared using the dry pressing processes. The effect of different contents of silica, sintering temperature and sintering time on the properties of the alumina-based ceramic core were investigated. The results indicated that the linear shrinkages of the specimens sintered at 1500℃ and 1600℃ for 2 h were nearly the same. When the sample was sintered at 1700℃ for 2 h, the bending strength was decreased and the porosity was increased due to the evaporation of SiO2. The shrinkage, bending strength, porosity and bulk-density of the specimens sintered at 1500℃ were invariable when the holding time exceeded 4 h. The sample sintered at 1500℃ for 2 h had linear shrinkage of 1.1%, bending strength of 63 MPa, the porosity of 35.5% and bulk-density of 2.29 g/cm3, which was hopeful to be the core candidate materials in high temperature application.

Key words: porous, alumina-based ceramic core, shrinkage, bending strength, porosity, bulk-density

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