Coarse pore evolution in dry-pressed alumina ceramics during sintering
Coarse pore evolution in dry-pressed alumina ceramics during sintering
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DOI：
10.1016/j.apt.2016.04.009
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发表时间：
2016-05-01
影响因子：
5.2
通讯作者：
Tanaka, Satoshi
中科院分区：
文献类型：
--
作者：
Hondo, Tsuyoshi;Kato, Zenji;Tanaka, Satoshi
烧结陶瓷中的粗大气孔往往会降低其力学性能和可靠性。本文用直接观察法研究了干压氧化铝陶瓷在烧结过程中粗气孔的演化。用光学显微镜、电子显微镜和微焦点X射线计算机断层扫描(Micro-CT)对干压氧化铝粉末粉末在1300-1500℃下成型和烧结后的氧化铝压坯进行了表征，在压制和烧结后的颗粒三点处出现了颗粒填充空洞特征的粗大气孔，并伴有氧化铝颗粒的残留。粉末压坯中存在的粗大气孔在烧结过程中尺寸和数量不断增大。烧结过程中粗大的气孔生长归因于显微结构中较小的相邻气孔的合并。(C)2016年日本粉末技术学会。由Elsevier B.V.和日本粉末技术学会出版。版权所有。
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.