烧结方法对掺铈氮化铝陶瓷电气性能的影响

IF 9.1 2区 化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR
Hatim Saidi , M. Coëffe-Desvaux , N. Pradeilles , P. Marchet , M. Joinet , A. Maître
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引用次数: 0

摘要

本文通过气压烧结 (GPS) 和火花等离子体烧结 (SPS) 两种方法研究了氮化铝陶瓷的致密化问题,采用铝酸铈 (CeAlO3) 作为烧结助剂,并比较了它们与普通氧化铈 (CeO2) 的影响。虽然 CeO2 等烧结辅助材料能促进致密化,但 CeAlO3 在 SPS 和 GPS 烧结过程中的反应活性较低。氧化铈和氧化铝之间的化学反应主要涉及还原相倍半二氧化铈(Ce2O3)。在 Ce2O3-Al2O3 伪二元体系的基础上,XRD 解释并证实了烧结过程中 CeAlO3 和 CeAl11O18 等次生相的形成。补充性表征结果表明,烧结显著影响了次生相的组成和分布。通过采用特定的致密化循环,SPS 产生了更小的晶粒和更厚的次生相带,从而提高了导电性。相反,GPS 产生了更粗的微观结构,包括更大的晶粒和次生相网络,以及三相点处的一些团聚。这些变化影响了整体导电性。含有 3 wt.% CeO2 且停留时间较短的 SPSed 样品具有更高的导电性,比 GPS 所获得的导电性高出约 6 个数量级。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Influence of the sintering methods on the electrical properties of cerium-doped aluminium nitride ceramics

This article investigates the densification of AlN ceramics through both Gas Pressure Sintering (GPS) and Spark Plasma Sintering (SPS) methods, employing cerium aluminates (CeAlO3) as sintering aids and comparing their influence to that of the usual cerium oxide (CeO2). While sintering aids like CeO2 promote densification, CeAlO3 exhibited lower reactivity during both SPS and GPS sintering. Chemical reactions between cerium oxide and aluminium oxide primarily involved the reduced phase as cerium sesquioxide (Ce2O3). On the basis on the Ce2O3–Al2O3 pseudo-binary system, the formation of secondary phases, such as CeAlO3 and CeAl11O18, during sintering was explained and confirmed by XRD. From complementary characterizations, it has been shown that sintering significantly impacted secondary phase composition and distribution. By employing specific densification cycles, SPS yielded smaller grains and thicker secondary phase cordons which led to enhanced electrical conductivity. Conversely, GPS produced coarser microstructures including larger grains and a network of secondary phases and some agglomerations at the triple points. These modifications influenced the overall conductivity. SPSed samples with 3 wt.% CeO2 and short dwelling times demonstrated higher electrical conductivity, exceeding by about 6 orders of magnitude the electrical conductivity of those obtained by GPS.

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来源期刊
Progress in Solid State Chemistry
Progress in Solid State Chemistry 化学-无机化学与核化学
CiteScore
14.10
自引率
3.30%
发文量
12
期刊介绍: Progress in Solid State Chemistry offers critical reviews and specialized articles written by leading experts in the field, providing a comprehensive view of solid-state chemistry. It addresses the challenge of dispersed literature by offering up-to-date assessments of research progress and recent developments. Emphasis is placed on the relationship between physical properties and structural chemistry, particularly imperfections like vacancies and dislocations. The reviews published in Progress in Solid State Chemistry emphasize critical evaluation of the field, along with indications of current problems and future directions. Papers are not intended to be bibliographic in nature but rather to inform a broad range of readers in an inherently multidisciplinary field by providing expert treatises oriented both towards specialists in different areas of the solid state and towards nonspecialists. The authorship is international, and the subject matter will be of interest to chemists, materials scientists, physicists, metallurgists, crystallographers, ceramists, and engineers interested in the solid state.
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