ABSTRACT The pore formation process has been studied for a high-temperature porous Mo–Si–B alloy produced by in situ reaction synthesis from elemental starting powders. The expansions, phase transformations, microstructure and pore parameters were investigated systematically as a function of the sintering temperature. For sintering temperatures of 1200°C and above, a multiphase mixture of the oxidation-resistant intermetallic compounds Mo3Si, Mo5Si3 and Mo5SiB2 was obtained. It was found that the porous alloys exhibit uniform skeletons with fine grains, high porosities and centred pore size distributions. Characterisation data obtained from samples sintered at temperatures from 1200 to 1600°C are used to deduce the processes which occur at each stage in the reaction synthesis. This helps to explain the formation mechanism for the pores and skeletons in this novel material.

中文翻译：

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原位反应合成多相多孔高温Mo-Si-B合金

摘要 研究了通过原位反应合成从元素起始粉末制备的高温多孔 Mo-Si-B 合金的孔形成过程。作为烧结温度的函数，系统地研究了膨胀、相变、微观结构和孔隙参数。对于 1200°C 及以上的烧结温度，获得了抗氧化金属间化合物 Mo3Si、Mo5Si3 和 Mo5SiB2 的多相混合物。发现多孔合金具有均匀的骨架，具有细晶粒、高孔隙率和中心孔径分布。从在 1200 至 1600°C 温度下烧结的样品获得的表征数据用于推断反应合成中每个阶段发生的过程。