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选用TiN,TiAlN,CrN和CrAlN 4种涂层材料,使用电阻炉对试样加热并保温,进行抗氧化性能实验,利用SEM、EDS和XRD获得了氧化结果。结果表明:Ti基涂层的氧化机制以O原子向涂层内部扩散为主;Cr基涂层的抗氧化机制为N原子和Cr离子向涂层表面的扩散所形成的微孔诱发的氧化;Cr基涂层比Ti基涂层具有较好的抗氧化性;Al的加入使得TiAlN与CrAlN涂层的氧化性能和高温后硬度提高,特别是CrAlN氧化后生成的致密Cr2O3和Al2O3混合氧化物使其抗氧化性能达到最优;氧化及涂层与基体的热涨失配使得几类涂层最终开裂失效;四种涂层的抗氧化能力为CrAlN>TiAlN>CrN>TiN。
TiN, TiAlN, CrN and CrAlN coating materials were selected. The samples were heated and insulated with a resistance furnace. The oxidation resistance was tested. The oxidation results were obtained by SEM, EDS and XRD. The results show that the oxidation mechanism of Ti-based coatings is dominated by the diffusion of O atoms into the coatings, and the oxidation-resistance mechanism of Cr-based coatings is micropore-induced oxidation of N atoms and Cr ions to the coating surface. Cr-based coating has better oxidation resistance than Ti-based coating. The addition of Al makes the oxidation properties of TiAlN and CrAlN coating and the hardness increase after high temperature, especially the Cr2O3 and Al2O3 mixed oxide produced by CrAlN oxidation The oxidation resistance and the thermal mismatch between the coating and the substrate caused the final cracking failure of several coatings. The anti-oxidation capacity of the four coatings was CrAlN> TiAlN> CrN> TiN.