Fabrication of fine-grained alumina ceramics by a novel process integrating stereolithography and liquid precursor infiltration processing

被引:32
作者
Liu, Wei [1 ]
Wu, Haidong [1 ]
Zhou, Maopeng [1 ]
He, Rongxuan [1 ]
Jiang, Qiangguo [1 ]
Wu, Ziwei [1 ]
Cheng, Yanling [1 ]
Song, Xuan [2 ]
Chen, Yong [2 ]
Wu, Shanghua [1 ]
机构
[1] Guangdong Univ Technol, Sch Electromech Engn, Guangzhou 510006, Guangdong, Peoples R China
[2] Univ Southern Calif, Epstein Dept Ind & Syst Engn, Los Angeles, CA USA
基金
中国国家自然科学基金;
关键词
Infiltration; Microstructure; Mechanical properties; Al2O3; COMPOSITES;
D O I
10.1016/j.ceramint.2016.08.099
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
In this study, we report a novel approach, integrating stereolithography and liquid precursor infiltration techniques, to fabricate fine-grained alumina ceramics. The XRD patterns of the sample immersed with Zr4+ or Zr4+ (Y3+) show that the sintered body contains Al2O3 and t-ZrO2 as the major phase and minor phase, respectively. Moreover, the t-ZrO2 phase in the sample immersed with Zr4+ (Y3+) shows intense peaks compared to the composite immersed with Zr4+. On the other hand, the sample immersed with Mg2+ contained Al2O3 and MgAl2O4 as the major phase and minor phase, respectively. The microstructure of the sample immersed with Zr4+ shows that ZrO2 particles are homogeneously distributed in the Al2O3 matrix, thus inhibiting the grain growth of alumina particles. Moreover, the sample immersed with Mg2+ shows a more dense and fine-grained structure. Compared to the non-infiltrated sample, the average grain size of the alumina sample immersed with Zr4+ or Mg2+ decreased. The sample infiltrated with Zr4+ (Y3+) had the smallest alumina average grain size of 1.14 mu m. The ceramics prepared by infiltration showed a higher hardness (19.54 GPa), but a slightly lower fracture toughness (4.02 MPa m(1/2)) compared to the samples (17.2 GPa, 4.13 MPa m(1/2)) without infiltration. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
引用
收藏
页码:17736 / 17741
页数:6
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