Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1573923 | Materials Science and Engineering: A | 2015 | 6 Pages |
Abstract
Crack-healing behavior and strength recovery of ZrO2(Y2O3)-Al2O3-MoSi2 (TZ3Y20A-MoSi2) ceramics have been investigated. Heat treatment in air enhances distinctly the flexural strength of TZ3Y20A-MoSi2 ceramics. Si-O oxide and ZrSiO4 are found after heat treatment, in which the former heals the cracks and recovers the strength, however, the latter is one kind of brittle materials that reduces mechanical performance of ceramics. The TZ3Y20A-10Â vol% MoSi2 ceramic has a complete crack-healing effect and strength recovery by suitable heat treatment at 1373Â K for 3Â h in air, however, the strength does not recover completely under other heat treatment conditions. With further increasing the MoSi2 contents to 20Â vol%, the flexural strength of as heat-treated TZ3Y20A-MoSi2 ceramics is higher than that of pre-cracked specimens, but remains lower than that of smooth specimens. Crack closure and rebonding of the crack walls are due to the formation of Si-O glassy phase by oxidation reaction.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Xiu-Ping Zhang, Jia-Hu Ouyang, Zhan-Guo Liu, Yu-Jin Wang, Ya-Ming Wang,