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材料成型及控制工程论文，论文编号:JX1391 论文字数:11466.页数:26
摘 要
氧化铝陶瓷是目前世界上生产量最大、应用面最广的工业陶瓷材料，具有十分诱人的应用前景。但是,由于它具有高脆性和均匀性差等致命弱点,影响了陶瓷零部件的工作可靠性和使用安全性,因此,提高氧化铝陶瓷的韧性是亟待解决的重要问题。
本文在ZrO2陶瓷增韧Al2O3陶瓷的基础上，研究不同含量MgO、CeO2、Y2O3对ZrO2陶瓷增韧性能的影响，并在此基础上研究Y离子稳定ZrO2相变增韧Al2O3陶瓷。结果得出：添加部分MgO后陶瓷体积密度得到了提高，随着MgO添加量的增加，陶瓷的体积密度出现了先增大后减小的趋势；CeO2的添加能够有效提高ZrO2陶瓷的烧结性能，随着CeO2添加量的增加，陶瓷的体积密度逐渐增大。CeO2虽然能细化ZrO2的陶瓷晶粒大小、促进陶瓷的致密化，却不能消除陶瓷中的裂纹；添加适量的Y2O3可以有效提高ZrO2陶瓷的烧结性能，随着Y2O3含量的增加，ZrO2陶瓷的体积密度呈现先增加后减小的趋势；采用 Y2O3 作稳定剂, 且当 ZrO2 含量较小 ( <20%) , 有助于提高 ZTA 陶瓷的致密度；随着3Y-ZrO2添加量的增加，陶瓷的晶粒逐渐细化。
关键词：添加剂 氧化锆 增韧 氧化铝 陶瓷
Abstract
Alumina ceramic is the world''''s production of the largest and broadest application of industrial ceramic materials, has a very attractive prospect. However, because of its high brittleness and poor uniformity of the Achilles heel, affecting the reliability of ceramic components and the use of the work of security, therefore, to improve the toughness of alumina ceramics is an important problem demanding prompt solution.
In this paper, ceramic ZrO2 toughened Al2O3 ceramic on the basis of different contents of MgO, CeO2, Y2O3 ceramics of ZrO2 toughening performance, and based on this study the stability of Y-ion ZrO2 phase transformation toughening Al2O3 ceramics. Results: After adding some MgO ceramic bulk density has been enhanced, with the addition of MgO increases the size of the density of ceramics first appeared in the trend of increased and then decreased; CeO2 addition can effectively improve the sintering properties of ceramic ZrO2, With the addition of CeO2 increased the size of the density of ceramics increases. Although CeO2 ceramic ZrO2 refined grain size, and promote the densification of ceramic, but not the elimination of cracks in ceramics; add the appropriate amount of Y2O3 can effectively improve the sintering properties of ceramic ZrO2, Y2O3 With the increase of the content, ZrO2 ceramic volume density at first increased and then decreased trend; for the use of Y2O3 stabilizer, and smaller when the ZrO2 content (<20%), help to improve the density of ZTA ceramics; With the addition of 3Y- ZrO2 increases, ceramics gradually refined grains.
Keywords: Addition agent；Zirconia；Touqhening；Alumina；Ceramic；
目 录
中文摘要 i
英文摘要 ii
目录 iii
第一章 概述 1
1.1 氧化铝陶瓷 1
1.2 氧化铝陶瓷增韧技术 1
1.3 ZrO2陶瓷结构及增韧机理 3
1.3.1 ZrO2陶瓷的相结构与转变 3
1.3.2 ZrO2增韧机制 4
1.4 各种添加剂对ZrO2性能的影响 4
1.4.1 MgO对ZrO2性能的影响 4
1.4.2 CeO2对ZrO2性能的影响 5
1.4.3 Y2O3对ZrO2性能的影响 5
1.5 氧化锆增韧氧化铝陶瓷材料的研究进展 6
1.6 立题依据和研究内容 6
1.6.1 立题依据 6
1.6.2 研究内容 6
第二章 实验与测试过程 7
2.1 Mg-ZrO2陶瓷的配方及制备过程 8
2.2 Ce-ZrO2陶瓷的配方及制备过程 9
2.3 Y2O3-ZrO2陶瓷的配方及制备过程 9
2.4 3Y-ZrO2/Al2O3复相陶瓷的配方及制备过程 10
第三章 结果分析 12
3.1 Mg-ZrO2陶瓷的烧结性能 12
3.1.1 Mg-ZrO2陶瓷烧结后的体积密度 12
3.1.2 Mg-ZrO2陶瓷烧结后的扫描电镜 13
3.2 Ce-ZrO2陶瓷的烧结性能 15
3.2.1 Ce-ZrO2陶瓷烧结后的体积密度 15
3.2.2 Ce-ZrO2陶瓷烧结后的扫描电镜 16
3.3 Y2O3-ZrO2陶瓷的烧结性能 17
3.3.1 Y2O3-ZrO2陶瓷烧结后的体积密度 17
3.3.2 Y2O3-ZrO2陶瓷烧结后的扫描电镜 18
3.4 3Y-ZrO2/Al2O3复相陶瓷的烧结性能 18
3.4.1 3Y-ZrO2/Al2O3复相烧结后的体积密度 18
3.4.2 3Y-ZrO2/Al2O3复相烧结后的扫描电镜 19
第四章 结论 21
致谢 22
参考文献 23
