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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.
The (Ti, Al) N gradient coating was deposited on the surface of 1Cr11Ni2W2MoV stainless steel by arc ion plating, and its high temperature oxidation resistance was determined by scanning electron microscopy (SEM) The formation of dense and complete Al2O3 oxide layer on the (Ti, Al) N coating sample surface at 700 ℃ and the growth of a few oxide particles appear after 200h.The excellent resistance of (Ti, Al) N coating The high temperature oxidation performance is due to its unique composition and structure. (Ti, Al) N is a ceramic coating that decomposes nitrides before oxidation. The resulting oxide film not only suppresses the formation of elements such as O and Al The diffusion also inhibits the diffusion of N element, enriching N2 at the oxidation reaction interface and reducing the partial pressure of oxygen, thereby further reducing the oxidation rate. The appearance of a few large oxide particles has little effect on the high temperature oxidation resistance of the coating.