A successful sol-gel process to encapsulate molybdenum di-silicide MoSi₂ particles with a closed and thermally stable Al₂O₃ layer using aluminium tri-sec-butoxide as a precursor is presented. The processing conditions such as precursor selection and temperature were optimized through analysing the interaction of the MoSi₂ particles with the sol. The application of the sol-gel based coating was followed by calcining the coated particles at temperatures between 900 and 1200 °C in Ar. The shell composition and the mechanical stability of the microcapsule were analysed by means of X-ray diffraction, scanning electron microscopy and thermogravimetric analysis. Upon calcining at 1200 °C in Ar, the MoSi₂ core remains intact as it is, covered by an α - alumina shell with a thickness of about 0.6 μm. The stability tests proved that the encapsulate particles are about five times more oxidation resistant than the uncoated MoSi₂ particles.

提出了一种成功的溶胶-凝胶工艺，该工艺使用三仲丁醇铝作为前体封装了具有封闭且热稳定的Al ₂ O ₃层的二硅化钼MoSi ₂钼颗粒。通过分析MoSi ₂颗粒与溶胶的相互作用，优化了工艺条件，例如前驱体选择和温度。溶胶-凝胶基涂层的应用后，在900至1200°C的温度下于Ar中煅烧涂覆的颗粒。通过X射线衍射，扫描电子显微镜和热重分析来分析微胶囊的壳组成和机械稳定性。在1200°C的Ar中煅烧后，MoSi ₂核保持原样，并被厚度约0.6μm的α-氧化铝壳覆盖。稳定性测试证明，包封的颗粒的抗氧化性是未涂覆的MoSi ₂颗粒的约五倍。