含 MoSi2、SiC 和 B4C 添加剂的 ZrB2 陶瓷:压实动力学、相形成和抗蠕变性

O. M. Grigoriev, V. Vinokurov, L. I. Klimenko, N. Bega
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引用次数: 0

摘要

对在一氧化碳气氛中热压条件下获得的基于硼化锆的陶瓷的压实过程、结构形成和机械性能进行了研究,这些陶瓷含有硼、硅和铬碳化物以及硅化钼等烧结活化添加剂。在 ZrB2-18% (体积分数)B4C 陶瓷中,使用 B4C 添加剂可将最佳热压温度降至 1940 ℃,并加快陶瓷的压实过程。样品制备背景对高温蠕变的影响已经确定,其结果要么是材料在较宽的温度范围内发生塑性流动,要么是屈服和脆性断裂的温度阈值较高。在 ZrB2-SiC 陶瓷中,无论是在烧结过程中还是在蠕变试验中,在高温塑性变形过程中都会形成具有亚微粒成分的双分散结构,这就是高蠕变率的原因。在 ZrB2-B4C 陶瓷中没有亚微粒成分,因此具有高达 2000 °C 的抗蠕变性。在热压过程中,ZrB2-MoSi2 陶瓷的相组成发生了显著变化;它由 ZrB2 固溶体与 SiC 和 B4C 第二相组成,就抗蠕变性而言,它处于其他两种陶瓷的中间位置。关键词:超高温陶瓷、二硼化锆、硅、硼和铬碳化物、CO 大气中的热压、压实动力学、结构、抗蠕变性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
ZrB2 ceramics with MoSi2, SiC and B4C additives: compaction kinetics, phase formation and creep resistance
A study was carried out of the processes of compaction, structure formation and mechanical properties of ceramics based on zirconium boride with sintering-activating additives of boron, silicon and chromium carbides, as well as molybdenum silicide, obtained under hot pressing conditions in a CO atmosphere. In ZrB2—18% (vol.) B4C ceramics, the use of the B4C additive reduces the optimal hot pressing temperature to 1940 °C and accelerates the compaction process of the ceramics. The influence of the sample preparation background on high-temperature creep has been established, as a result of which either plastic flow of the material occurs over a wide temperature range, or a high temperature threshold for yield and brittle fracture. In ZrB2—SiC ceramics, during high-temperature plastic deformation both during sintering and in creep tests, a bidisperse structure with a submicrograined component is formed, which is responsible for high creep rates. In ZrB2—B4C ceramics there is no submicrograin component, which provides high creep resistance up to 2000 °C. The phase composition of ZrB2—MoSi2 ceramics changes dramatically during hot pressing; it is represented by a composition of a ZrB2 solid solution with the second phases of SiC and B4C, and in terms of creep resistance it occupies an intermediate position between two other ceramics. Keywords: ultra-high temperature ceramics, zirconium diboride, silicon, boron and chromium carbides, hot pressing in a CO atmosphere, compaction kinetics, structure, creep resistance.
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