Coarse pore evolution in dry-pressed alumina ceramics during sintering

被引：31

作者：

Hondo, Tsuyoshi ^{[1
]}

Kato, Zenji ^{[1
]}

Yasuda, Kouichi ^{[2
]}

Wakai, Fumihiro ^{[3
]}

Tanaka, Satoshi ^{[1
]}

机构：

[1] Nagaoka Univ Technol, Dept Mat Sci & Technol, 1603-1 Kamitomioka, Nagaoka, Niigata 9402188, Japan

[2] Tokyo Inst Technol, Dept Mat Sci & Technol, Meguro Ku, 2-12-1-S7-14 Ookayama, Tokyo 1528552, Japan

[3] Tokyo Inst Technol, Lab Mat & Struct, Midori Ku, R3-23 4259 Nagatsuta, Yokohama, Kanagawa 2268503, Japan

来源：

ADVANCED POWDER TECHNOLOGY | 2016年 / 27卷 / 03期

关键词：

Granules; Pores; Sintering; Computed tomography; PROCESSING DEFECTS; INTERNAL STRUCTURE; STRENGTH; RELEVANCE; REGIONS; SIZE; CT;

D O I：

10.1016/j.apt.2016.04.009

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Coarse pores in a sintered ceramic often degrade its mechanical properties and reliability. In this paper, the evolution of coarse pores in a dry-pressed alumina ceramic during sintering is characterized by direct observation. Alumina compacts prepared by dry-pressing alumina powder granules were characterized using optical microscopy, electron microscopy, and micro-focus X-ray computed tomography (micro-CT) after forming and after sintering at temperatures 1300-1500 degrees C. Coarse pores characteristic of particle packing voids are present at granule triple points after pressing and sintering, along with remnants of the alumina granules. The coarse pores present in the powder compact grow in size and number during sintering. Coarse pore growth during sintering is attributed to the coalescence of the smaller, neighboring pores in the microstructure. (C) 2016 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.

引用

页码：1006 / 1012

页数：7

共 33 条

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