Relation between change of porosity and parameters of grains during annealing of the superconducting ceramics YBa2Cu3O7-x

被引：1

作者：

Imayev, M. F. ^{[1
]}

Kabirova, D. B. ^{[1
]}

Sagitov, R. I. ^{[2
]}

Churbaeva, Kh A. ^{[2
]}

机构：

[1] Russian Acad Sci, Inst Met Superplast Problems, Ufa 450001, Russia

[2] Ufa State Aviat Tech Univ, Ufa, Russia

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2012年 / 32卷 / 06期

关键词：

Oxide superconductors; Grain growth; Grain size; Platelets; Porosity; LIQUID-PHASE; GROWTH; DENSIFICATION; MICROSTRUCTURE;

D O I：

10.1016/j.jeurceramsoc.2011.10.046

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The correlation between changes of porosity and the parameters of grains was studied during the annealing of fine-grained ceramics Y123 with various amounts of phase Y211 in the temperature range 900-990 degrees C with the aim of revealing the mechanism of pore healing. Y123 grains retain their larnellar shape within the temperature range of annealing. Authenticated cases of growth of grains towards pores via local bulging of a plane surface have not been revealed. Healing of pores is observed only in the temperature range 900-975 degrees C. The most complete pore healing takes place when secondary recrystallization occurs in the sample with the resulting formation of the microstructure possessing wide distributions of grain sizes and grain aspect ratios. 2D simulations have shown that Y123 behaves like a free-flowing body. During the growth of a microstructure with a large variety of grain sizes and aspect ratios, the grains better fit each other, and pores decrease. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：1261 / 1268

页数：8

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