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分别用超音速氧燃料工艺和大气等离子工艺在球墨铸铁QT-500上制备热障涂层的粘结层与陶瓷层。通过X射线衍射仪、扫描电子显微镜和Cr3+荧光光谱表征热障涂层随着高温氧化服役进行界面化合物演变规律。研究表明,热障涂层的粘结层/陶瓷层界面上层(CS层)由(Co,Ni)(Co,Al)2O4和Co3O4组成,其下层为Al2O3;用面积法分析了CS层和Al2O3层厚度的变化规律;粘结层/基底合金界面的热生长氧化物为层状和块状交替分布的形貌,其成分主要为Al2O3。1050℃+15 h高温氧化后,粘结层/陶瓷层界面残余压应力随θ-Al2O3→α-Al2O3相转变完全达最低值,然后其残余压应力略有升高,这与大量生长的Co3O4和尖晶石类氧化物有关。
The bonding layer and the ceramic layer of the thermal barrier coating were prepared on the ductile iron QT-500 by a supersonic oxygen fuel process and atmospheric plasma process respectively. The evolution of interfacial compounds was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Cr3 + fluorescence spectroscopy. The results show that the upper layer (CS layer) of the cohesion layer / ceramic layer of the thermal barrier coating consists of (Co, Ni) (Co, Al) 2O4 and Co3O4, and the lower layer is Al2O3. The results showed that the thermal growth oxides at the interface of the bonding layer and the base alloy were alternately layered and agglomerated with the composition of Al2O3.1050 ℃ + 15 h after high temperature oxidation, the bonding layer / ceramic The residual compressive stress at layer interface completely reaches the lowest value with θ-Al2O3 → α-Al2O3 phase transformation, and then the residual compressive stress slightly increases, which is related to the large amount of Co3O4 and spinel oxides.