研究了0Cr_(18)Ni_9Ti奥氏体不锈钢等离子渗铪以及渗铪后进行渗碳并在静态空气中的抗高温氧化行为。研究表明:渗铪合金层厚度为35μm,渗层连续致密无孔洞,与基体呈冶金结合,表面物相主要有Hf、HfC、Hf_2Fe;渗铪+渗碳层厚度为100μm,渗层弥散分布许多粒状和短棒状碳化物颗粒,尺寸在1~2μm,主要类型为MC、M_7C_3、M_(23)C_6型。1050,1100℃下氧化时渗Hf试样氧化速率约为基材的1/3、1/8,而渗Hf+渗C试样约为1/8、1/25,随着氧化温度升高时,氧化速率增大,增幅及氧化增重均为渗Hf+渗C试样<渗Hf试样<基材,且氧化增重近似符合抛物线规律;依次渗Hf和渗C后,经过高温氧化,试样表面合金元素降低、Hf含量升高,表面剥落得到改善,氧化缺陷减少、孔洞变小,Hf起到固化表面氧化物层、提高固溶强化的作用,HfC等碳化物以及HfO_2可以有效降低氧离子的扩散速率,显著提高抗高温氧化性能。 The high-temperature oxidation behavior of 0Cr_ (18) Ni_9Ti austenitic stainless steel after plasma hafnium and carburized hafnium was studied in static air. The results show that the thickness of the hafnium alloy layer is 35μm, the continuous and dense pores of the infiltrated layer are metallurgically bonded to the substrate. The surface phases of the hafnium alloy are Hf, HfC and Hf_2Fe. The thickness of hafnium and carburized layer is 100μm, Granular and short rod-shaped carbide particles, the size of 1 ~ 2μm, the main types of MC, M_7C_3, M_ (23) C_6 type. At 1050, the oxidation rate of Hf during oxidation was about 1/3, 1/8 of that of the substrate when infiltrated at 1100 ° C, while the permeation Hf + C sample was about 1/8, 1/25. As the oxidation temperature increased , The oxidation rate increases, the increase and the oxidation weight gain are the infiltration Hf + infiltration C sample