论文部分内容阅读
燃气轮机静叶片和转动部件等高温下使用陶瓷的主要困难是它的耐冲击性相当差。过去曾提出过,用加固纤维和形成表面挤压层两种方法提高它的耐冲击性。但是,迄今为止,这两种方法的研究还未获得显著的成效。该专利提出的第三种提高陶瓷件的耐冲击性的方法是,在氧化铝、碳化硅和氮化硅等脆性陶瓷件外层,加一层内有微细裂纹的低弹性模量的材质,做为吸收能量的表面层,以提高它的耐冲击性。
The main difficulty in using ceramics at high temperatures for gas turbine vanes and rotating parts is that its impact resistance is rather poor. It has been proposed in the past that the impact resistance is improved by both the reinforcing fiber and the surface-forming layer. However, so far, the research on these two methods has not achieved remarkable results. The third method proposed by this patent for improving the impact resistance of ceramic parts is to add a layer of a material having a low modulus of elasticity with fine cracks in the outer layers of brittle ceramic parts such as alumina, silicon carbide and silicon nitride, As a surface layer to absorb energy to improve its impact resistance.