Al2O3和SiO2惰性填料对填充胶结制备B改性硅化物涂层组织演变及高温抗氧化性能的影响

THE Coatings Pub Date : 2021-06-11 DOI:10.3390/COATINGS11060700

L. Su, Guanqun Zhuo, Ha-young Song, Jianyong Yang, Kaiyong Jiang

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引用次数: 1

摘要

本研究以Al2O3或SiO2惰性填料为填料，采用填充胶结技术在Nb-Si基合金上制备了B改性硅化物涂层。这两种涂层主要由(Nb,X)Si2和(Nb,X)B2 + (Nb,X)Si2外层组成。在1250℃氧化100 h后，由于形成致密的二氧化硅，涂层表现出良好的抗氧化性。Al2O3惰性填料制备的涂层氧化产物由SiO2、TiO2和Cr2O3组成，而SiO2惰性填料制备的涂层氧化产物由SiO2、TiO2、Cr2O3和HfO2组成。氧化产物的不同可能是由于两种样品在初始氧化阶段的氧化过程不同所致。

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Effect of Al2O3 and SiO2 Inert-Fillers on the Microstructural Evolution and High Temperature Oxidation Resistance of B Modified Silicides Coatings Prepared by Pack Cementation Technology

In this study, B modified silicide coatings were prepared on Nb-Si based alloy with Al2O3 or SiO2 inert-filler by pack cementation technology. Both coatings primarily consisted of a (Nb,X)Si2 with a (Nb,X)B2 + (Nb,X)Si2 outer layer. After oxidation at 1250 °C for 100 h, the coatings showed good oxidation resistance due to the formation of a dense silica. The oxidation products of the coating prepared with Al2O3 inert-filler consisted of SiO2, TiO2 and Cr2O3, while that of the coating prepared with SiO2 inert-filler consisted of SiO2, TiO2, Cr2O3, and HfO2. The different oxidation products may be due to the different oxidation process of these two sample at initial oxidation stage.

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THE Coatings

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