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High-Temperature Strength of Liquid-Phase-Sintered SiC Ceramics with Oxynitride Glass

机译：含氮氧化物玻璃的液相烧结SiC陶瓷的高温强度

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摘要

Identification of sintering additives that simultaneously lead to high-toughness and a highly refractory, intergranular glassy film after complete densification has proved challenging. In this study, SiC ceramics sintered with AlN-Re_2O_3 (Re=Y, Yb, Er, Lu) have been prepared and their strength at 1600℃ was investigated. Microstructural features of SiC with AlN-Er_2O_3, which showed the best strength of 550 MPa at 1600℃, were investigated using transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS). The excellent 1600℃-strength of SiC ceramics with AlN-Er_2O_3 was attributed to (1) the precipitation of Er-containing phase and Fe-containing C from the composition, i.e., reduction or removal of Fe and oxygen contents from the liquid composition and (2) the introduction of Al into SiC, i.e., removal or reduction of Al from the composition, resulting in an intergranular glassy film with high refractoriness.
机译：在完全致密化之后，鉴定同时导致高韧性和高耐火性，晶间玻璃质薄膜的烧结添加剂已被证明具有挑战性。本研究制备了以AlN-Re_2O_3（Re = Y，Yb，Er，Lu）烧结的SiC陶瓷，并研究了其在1600℃的强度。利用透射电子显微镜（TEM）和能谱仪（EDS）研究了AlN-Er_2O_3碳化硅在1600℃时的最佳强度为550 MPa的组织结构。具有AlN-Er_2O_3的SiC陶瓷优异的1600℃强度归因于（1）成分中含Er相和含Fe C的析出，即减少或去除了液体成分中的Fe和氧含量； （2）将Al引入SiC，即，从组合物中除去或还原Al，得到具有高耐火度的晶间玻璃状膜。

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