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Surface Strengthening of Alumina‐Zirconia Composite by Addition of Molybdenum Dioxide
Author(s) -
Shin YuSeon,
Kang SukJoong L.
Publication year - 1993
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1993.tb08352.x
Subject(s) - flexural strength , materials science , cubic zirconia , composite number , volume fraction , molybdenum , composite material , volume (thermodynamics) , compressive strength , matrix (chemical analysis) , surface layer , layer (electronics) , metallurgy , ceramic , physics , quantum mechanics
MoO 2 is found to stabilize m ‐ZrO 2 Because of the addition of MoO 2 into ZrO 2 at the surface region of an Al 2 O 3 ‐15 vol% ZrO 2 composite, the volume fraction of m ‐ZrO 2 at the surface increases from 0.3 to 0.5–0.6 without changing the size of the ZrO 2 grains. This enhanced transfomation results in an increase in flexural strength of up to 30% because of compressive stresses built in at the surface. The increase in flexural strength is proportional to the difference in volume fraction of m ‐ZrO 2 between the surface layer and the bulk matrix, in agreement with a previous analysis.