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Mechanochemical Effects on Microstructure and Mechanical and Thermal Properties of Fine Ceramics

机械力化学对精细陶瓷微观结构和机械热性能的影响

基本信息

批准号：
06453090
负责人：
SAITO Fumio
金额：
$ 4.67万
依托单位：
Institute for Advanced Materials Processing
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

Grinding of mixture composing of two or three kinds of minerals was conducted in different types of mill under dry atmospheric and wet conditions. The minerals were kaolinite, gibbsite, talc and other inorganic materials, and they were mixed so as to be stoichiometric compositions of mullite, cordierite, forsterite and other fine ceramics. Subsequently, the ground mixtures were sintered to form the ceramics. Mechanochemical effects on microstructure and mechanical and thermal properties of the fine ceramics were characterized by XRD,TG-DTA,SEM-EDS analyzes, and bending strength and thermal expansion, coefficient measurements. The research results are summarized as follows :(1)Grinding operation causes structural change of the starting powders from crystalline state into amorphous one. The structural change of the powders is attributed to the dehydration of the powders.(2)Prolonged grinding enables us to reduce the sintering tempera-ture to form monophase of the fine ceramics.(3)Bulk density of the sintered bodies increases with increasing the grinding time and the sintered temperature.(4)The bending strength of the sintered bodies increases with an increase in grinding time.(5)Grinding of the starting powders gives us relatively lower thermal expansion coefficient of the sintered bodies than usual.Thus, the mechanochemical effects appeared on the starting powders play a significant role to improve the mechanical and thermal properties of the fine ceramics.

对两种或三种矿物组成的混合物在不同类型的磨机中进行了干磨和湿磨试验。矿物为高岭石、三水铝石、滑石和其它无机材料，将它们混合以使莫来石、堇青石、镁橄榄石和其它精细陶瓷的化学计量组成。随后，将研磨的混合物烧结以形成陶瓷。通过XRD、TG-DTA、SEM-EDS分析以及抗弯强度、热膨胀系数等测试手段，研究了机械力化学效应对细陶瓷微观结构、力学性能和热性能的影响。主要研究结果如下：（1）球磨过程中，原料粉末的结构由晶态转变为非晶态。粉末的结构变化归因于粉末的脱水。（2）延长研磨时间，可降低烧结温度，形成单相细陶瓷。（3）烧结体的体积密度随研磨时间和烧结温度的增加而增加。（4）烧结体的抗弯强度随着研磨时间的增加而增加。（5）原料粉末的研磨使烧结体的热膨胀系数相对较低，因此，原料粉末中出现的机械力化学效应对提高精细陶瓷的力学性能和热性能起着重要作用。