PHASE COMPOSITION STABILITY OF NANOSTRUCTURED COMPOSITE CERAMICS BASED ON CaO-ZrO2 UNDER HYDROTHERMAL IMPACT

被引：9

作者：

Dmitrievskiy, A. A. ^{[1
]}

Zhigacheva, D. G. ^{[1
]}

Efremova, N. Yu. ^{[1
]}

Umrikhin, A. V. ^{[1
]}

机构：

[1] Derzhavin Tambov State Univ, Tambov 392000, Russia

来源：

NANOTECHNOLOGIES IN RUSSIA | 2019年 / 14卷 / 3-4期

基金：

俄罗斯基础研究基金会;

关键词：

MECHANICAL-PROPERTIES; ZIRCONIA CERAMICS; ALUMINA; MICROSTRUCTURE; TOUGHNESS;

D O I：

10.1134/S1995078019020058

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Structure, phase composition, and mechanical properties (microhardness within indenter penetration depths of 1200 nm <= h <= 6000 nm and fracture toughness) are studied on nanostructured zirconia ceramics (CaO stabilized) hardened with corundum and SiO2 during accelerated aging under hydrothermal conditions (T-ag = 134 degrees C, P = 3 atm, H = 100%, 0 <= t(ag) <= 25 h). The use of CaO as a stabilizer of the zirconia tetragonal phase (instead of "conventional" Y2O3) promotes increasing resistance to hydrothermal effects of composite ZrO2 + Al2O3 and ZrO2 + Al2O3 + SiO2 ceramics. The reached fracture toughness (more than in 40%) via introduction of silica ( = 5 mol %) increase provides a satisfactory hardness/fracture toughness (H = 12.3 GPa, K-C = 6.66 MPa m(1/2)) ratio of the Ca-ZrO2 + Al2O3 + SiO2 composite ceramics even after its accelerated 25-h aging.

引用

页码：125 / 131

页数：7

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