摘要
在ZrO2陶瓷涂层中加入适量的CeO2,使陶瓷涂层的抗热震性能得到提高,这主要是由于CeO2的加入,涂层的微小孔隙增加、涂层产生细微的网状裂纹,增加了微裂纹密度,从而降低了涂层的弹性模量,释放了涂层中的应力,提高了涂层的裂纹失稳扩展时的临界温差ΔTc,并可阻止裂纹沿单方向的快速扩展,使涂层的抗热震起裂性能和抗热震失效能力得到提高。其中,CeO2加入量为9%效果最佳,过量加入CeO2,会过早地促进裂纹的扩展、断裂,不利于提高涂层的抗热震性能。
The thermal shock resistance of coating was increased by adding CeO2 to the ZrO2 ceramic coating. Because the difference of thermal expansion coefficient between ZrO2 and CeO2 facilitates the formation of microcracks and increases the density of the microcracks, this effect was made. As a result, the elastic module of the coating is decreased, and the internal stress in coating is released. At the same time, the critical difference in temperature ΔTc is increased when the cracks of the coating expand unsteadily, and the unidirectional rapid expansion was held back, so the thermal shock life time before coating initiation and the life time before coating failure were increased. It can be seen from the results that the effect is good when the content of CeO2 is 9%. When excessive CeO2 added, the expansion and fracture of the cracks are facilitated and the thermal shock resistance of the coating is damaged.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2003年第2期247-249,共3页
Journal of the Chinese Society of Rare Earths
基金
黑龙江省自然科学基金
关键词
无机非金属材料
CEO2
陶瓷涂层
抗热震性
稀土
inorganic non-metallic materials
CeO_2
ceramic coating
thermal shock resistance
rare earths
