【摘要】 利用电弧离子镀在1Cr11Ni2W2MoV不锈钢表面上沉积了(Ti,Al)N梯度涂层,通过用扫描电镜对700℃空气条件下氧化500h试样表面形貌分析来测定其抗高温氧化性能.分析表明:700℃条件下(Ti,Al)N涂层试样表面形成致密完整的Al2O3氧化物层,在200h以后出现少数氧化物颗粒的长大现象.分析认为(Ti,Al)N涂层优良的抗高温氧化性能是由于其特有的成分与结构所致.(Ti,Al)N为陶瓷涂层,氧化时先要发生氮化物的分解,而生成的Al2O3氧化膜不仅可以抑制O、Al等元素的扩散,也会抑制N元素的扩散,使N2在氧化反应界面处富集而降低氧分压,从而会进一步降低氧化速度,少数大氧化物颗粒的出现对涂层的高温氧化性影响甚微.更多还原

【Abstract】 (Ti,Al)N coating was deposited on 1Cr11Ni2W2MoV stainless steel by arc-ion plating and then annealed at 700?℃ in air for 500 h. The morphology of the coating was studied by using SEM and EDS to analyze its high temperature oxidation resistance.All coatings annealed in different hours were covered with dense oxidized layer, except some large oxidized particles appeared on the (Ti,Al)N coating which was oxidized more than 200 h. The study indicates that the excellent high temperature oxidation resistance of (Ti,Al)N coating can be attributed to its special composition and structure . (Ti, Al) N is the ceramic coating, the resolving of nitrogen thing happens first while oxidizing.The Al2O3 flins that produce oxidizing membrane can suppress O , Al ,etc. diffusion of element , will suppress N diffusion of element, make N2 oxidize and reflecting the interface office to collect and reduce oxygen partial pressure richly, thus will reduce the speed of oxidizing further, while the large oxidized particles have almost no effect on the oxidation resistance of (Ti,Al)N coating.更多还原