MoSi2-硼硅玻璃鳞片状高发射率耐高温涂层

MoSi2-Borosilicate glass high emissivity coating with scaly structure and high temperature resistance

摘要:

为了从本质上改变传统高辐射率耐高温涂层刚度大、脆性明显的问题,受自然界中蛇皮结构的启发,本文将浆料法与溶胶-凝胶法相结合,采用硅溶胶作为溶剂,MoSi₂作为发射剂,硼硅玻璃作为高温粘结剂,成功制备出具有鳞片状结构的柔性高发射率耐高温涂层。与相同组成、面密度以及烧结制度的致密涂层相比,鳞片状涂层在保障其高的发射剂含量与发射率的同时,具备了非常高的柔韧性,包括抗接触损伤、抗热震以及弯曲强度在内的多个力学性能均得到了不同程度幅度的提升。

Abstract:

The traditional high temperature resistant coating with high emissivity have the characteristics of large rigidity and obvious brittleness. In order to change these properties in essence, we successfully have produced a kind of scaly and flexible coating with high emissivity and high temperature resistance inspired by structure of the snakeskin in nature. We combine slurry method with sol-gel method, and use silica sol as solvent, MoSi₂ as emittance agent and borosilicate glass as high temperature binder. Compared with the dense coating with the same composition, surface density and sintering process, the scaly coating have high flexibility while ensuring high emittance agent content and emissivity. The mechanical properties, including contact damage resistance, thermal shock resistance and bending strength, have been improved in varying degrees.