摘要
本研究通过喷涂工艺试验确定了超音速火焰喷涂Ni Cr Al Y粘结层和等离子喷涂双层热障涂层的工艺参数。粘结层拉伸结合强度和显微硬度较高,涂层致密,且具有利于提高陶瓷层结合强度的粗糙表面。内层为8YSZ氧化锆层、外层为单相La2Ce2O7层的双层热障涂层体系具有较好的抗热震性能和弯曲性能。在室温到1200℃的温度范围内,DCL涂层的热导率均小于8YSZ热障涂层。两种热障涂层的热导率值均在室温下最大,随着温度的升高而降低,但到800℃以后则随温度增加而有小幅升高。
Spray parameters were established for a thermal barrier coating system with a plasma sprayed double ceramic layer (DCL) and a HVOF sprayed NiCrAlYbondcoat. The bondcoat was characterized with high tensile bond strength and microhardness, a dense microstructure, and a rough surface desirable for the adhesion of the double ceramic layer to the bondcoat.This thermal barrier system has a satisfactory heat shock resistance and bending property, with its DCL topcoat composed of an internal 8YSZ layer and an outer single-phased La2Ce2O7 layer.The DCL thermal conductivity is less than that of the 8YSZ over a temperature range of a room temperature -1200℃. Both of their conductivities exhibited maximum values at room temperature, which decreased with an increase in temperature up to 800℃ , subsequently moderate rises in the ceramic conductivities with temperature were observed till 1200℃.
出处
《热喷涂技术》
2017年第4期44-49,共6页
Thermal Spray Technology
关键词
等离子喷涂
超音速火焰喷涂
热障涂层
氧化
热腐蚀
Air plasma spray
High velocity oxygen fuel spray
Thermal barrier coating
Property