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多孔铝基陶瓷型芯的制备及其性能 被引量:11

Fabrication and Properties of Porous Alumina-based Ceramic Core
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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. 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.
出处 《无机材料学报》 SCIE EI CAS CSCD 北大核心 2012年第3期239-244,共6页 Journal of Inorganic Materials
基金 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)~~
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 porous alumina-based ceramic core shrinkage bending strength porosity bulk-density
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