A study on the influence of the silicate composition on the self-healing ability of a promising environmental barrier coating (EBC) material is reported. The EBC material consists of silicon carbide particles dispersed in a ytterbium silicate matrix. The composition of the silicate was varied from pure monosilicate to pure disilicate including a mixture of 50 vol-% of both phases. Pre-cracked specimens were mechanically tested before and after thermal annealing in air at 1400 °C accompanied by microstructural investigations. It is shown, that the self-healing mechanism is based on the application of compressive surface stresses due to graded oxidation of the SiC particles. With increasing amount of disilicate strength and self-healing ability increase.

报道了关于硅酸盐组成对有前途的环境屏障涂料（EBC）材料的自愈能力的影响的研究。EBC材料由分散在硅酸y基质中的碳化硅颗粒组成。硅酸盐的组成从纯单硅酸盐变为纯二硅酸盐，包括两相的50体积％的混合物。在1400°C的空气中进行热退火之前和之后，对预开裂的样品进行机械测试，并进行微观结构研究。结果表明，自修复机制是基于SiC颗粒逐渐氧化而产生的压缩表面应力。随着二硅酸盐量的增加，强度和自愈能力增加。