Particulars of polycrystalline oxide ceramic creep at temperatures to 1600°C

被引：0

作者：

V. S. Bakunov

E. S. Lukin

É. P. Sysoev

机构：

[1] Joint Institute for High-Temperature Research,

[2] Russian Academy of Sciences,undefined

[3] D. I. Mendeleev Russian Chemical Technology University,undefined

[4] Vladimir State University,undefined

来源：

Glass and Ceramics | 2012年 / 69卷

关键词：

polycrystalline oxide ceramic; creep; brittle–plastic transition;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The results of an investigation of creep in a polycrystalline metal-oxide ceramic at temperatures to 1600°C and under high loads are presented. These temperatures lie near the transition from the brittle to plastic behavior of the ceramic. The loads are close to the ultimate strength of the materials at the given temperature. It is shown that the elementary mechanism of deformation in the entire plasticity range of the samples is diffusion-viscous (vacancy or interstitial) flow in its different forms—diffusion motion of dislocations and crystal boundaries. The data obtained are in agreement with the supposition that for a transition from brittle to plastic fracture of a ceramic a critical vacancy concentration in the ceramic is required. These vacancies are formed as a result of thermal activation and determine the deformation of the materials.

引用

页码：61 / 64

页数：3