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Effect of different contents of zirconia and yttrium oxide on microstructure and properties of high alumina ceramics
Author(s) -
Huang Bensheng,
Fu Sheng,
Zhang Shunshun,
Lin Anna,
Guan Zhongyi
Publication year - 2019
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13444
Subject(s) - materials science , yttrium , cubic zirconia , microstructure , ceramic , flexural strength , yttria stabilized zirconia , oxide , indentation hardness , composite material , metallurgy
The effects of zirconia and yttrium oxide addition on microstructure, bulk density, microhardness, flexural strength, and wear resistance of high alumina ceramics (>97 wt% Al 2 O 3 , MSA ceramics) composed of MgO–SiO 2 –Al 2 O 3 system have been investigated. The results show that the addition of zirconia makes the mechanical properties and wear properties of ceramics composed of MgO–SiO 2 –Al 2 O 3 –ZrO 2 (MSAZ ceramics) system have been greatly improved compared with MSA ceramics. In addition, the ceramics composed of MgO–SiO 2 –Al 2 O 3 –ZrO 2 –Y 2 O 3 (MSAZY ceramics) system have better mechanical properties and wear properties than MSAZ ceramics. With the contents of zirconia and yttrium oxide increase, the bulk density, microhardness, and flexural strength of MSAZ and MSAZY ceramics increased at first and then decreased. However, the wear rate shows the opposite. When 0.4 wt% ZrO 2 and 0.6 wt% Y 2 O 3 were added to the matrix, the wear rate of MSAZY ceramics reached a minimum of 0.042%, and the wear resistance was improved by about 73.8% compared with MSA ceramics with a wear rate of 0.16%. In addition, the optimum additions of zirconia and yttria are 0.4% and 0.6%, respectively.