Microstructure and composition of multi-layered oxide scale evolved during isothermal exposure of ZrB2–SiC–LaB6 composite to air at 1500°C

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Philosophical Magazine Letters Pub Date : 2021-04-14 DOI:10.1080/09500839.2021.1912426

S. Kashyap, R. Mitra

引用次数: 3

Abstract

ABSTRACT The ZrB2–SiC–LaB6 composite prepared by spark plasma sintering with B4C and C as additives was isothermally exposed in air at 1500°C for 24 h and the evolved oxide scale examined by scanning and transmission electron microscopy. It was found that a glassy borosilicate (BSG) layer with a thin film of La2Si2O7 had formed on the outermost surface of oxide scale, contributing to protection against oxidation. The detailed investigation of the cross-section of the oxide scale has revealed the formation of a layered microstructure formed by growth involving partial crystallisation of BSG forming ZrSiO4 along with re-precipitation of La2Si2O7 and ZrO2 after prior dissolution of La2O3 and ZrO2 in the glassy matrix.

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ZrB2–SiC–LaB6复合材料在1500°C空气中等温暴露过程中形成的多层氧化皮的微观结构和成分

摘要:以B4C和C为添加剂，火花等离子烧结制备ZrB2-SiC-LaB6复合材料，在1500℃的空气中等温暴露24 h，通过扫描电镜和透射电镜观察氧化结垢。结果表明，氧化膜的最外层形成了一层具有La2Si2O7薄膜的硼硅酸盐(BSG)玻璃层，起到了抗氧化作用。对氧化层截面的详细研究揭示了层状微观结构的形成，这是由BSG形成ZrSiO4的部分结晶以及La2Si2O7和ZrO2在玻璃基体中预先溶解后的再沉淀形成的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Philosophical Magazine Letters 物理-物理：凝聚态物理

CiteScore

2.60

自引率

0.00%

发文量

审稿时长

2.7 months

期刊介绍： Philosophical Magazine Letters is the rapid communications part of the highly respected Philosophical Magazine, which was first published in 1798. Its Editors consider for publication short and timely contributions in the field of condensed matter describing original results, theories and concepts relating to the structure and properties of crystalline materials, ceramics, polymers, glasses, amorphous films, composites and soft matter. Articles emphasizing experimental, theoretical and modelling studies on solids, especially those that interpret behaviour on a microscopic, atomic or electronic scale, are particularly appropriate. Manuscripts are considered on the strict condition that they have been submitted only to Philosophical Magazine Letters , that they have not been published already, and that they are not under consideration for publication elsewhere.