Microstructure and mechanical properties of Y2O3 stabilized tetragonal zirconia based nanocomposites incorporating metal dispersions

被引：0

作者：

Nawa, Masahiro ^{[1
]}

Yamazaki, Keiichi ^{[1
]}

Sekino, Tohru ^{[1
]}

Niihara, Koichi ^{[1
]}

机构：

[1] Matsushita Electric Works, Ltd, Kadoma, Japan

来源：

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy | 1994年 / 41卷 / 10期

关键词：

Composition effects - Crystal microstructure - Dispersions - Fracture toughness - Granular materials - Hot pressing - Molybdenum - Particles (particulate matter) - Polycrystals - Yttrium compounds - Zirconia;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Yttria stabilized tetragonal zirconia polycrystal (Y-TZP)/0-100 vol% molybdenum (Mo) composites were fabricated by hot-pressing a mixture of Y-TZP powder containing 3 mol% yttria and a fine Mo powder in vacuum. This composite system possessed a novel microstructural feature composed of a mutual intragranular nanostructure, in which either nanometer sized Mo particles or equivalent sized zirconia particles were located within the zirconia grains or Mo grains, respectively. Both fracture strength and toughness increased with increasing Mo content. They achieved a simultaneous improvement in strength and toughness that overcame the strength-toughness tradeoff relation. A maximum fracture strength of 2100 MPa was obtained at 70 vol% Mo content. Moreover, a fracture toughness increased dramatically with increasing Mo content above 40 vol% and exhibited 18.0 MPa&middotm1/2 at above 50 vol% Mo content. The relation between microstructure and mechanical properties will be discussed.

引用

页码：1220 / 1225