论文部分内容阅读
采用高能微弧合金化技术(HEMAA)在K3高温合金上制备NiAl金属间化合物合金化层。通过反复试验,筛选出合适的输出功率、沉积时间、频率等工艺参数,得到均匀致密的微晶合金化层,实现了合金化层与基体之间的冶金结合。对合金化层的显微组织、常温电化学腐蚀以及高温氧化性能进行了研究。无论在酸性含氯离子还是在酸性不含氯离子溶液中,NiAl微晶合金化层的耐蚀性能较电极材料有所提高。在1000℃高温氧化性能显示,无论合金化层还是电极材料都形成连续致密的、粘附性良好的富Al2O3氧化膜,但是由于合金化层制备时产生热裂纹,在裂纹处易生成了富Ni的氧化物,使得其氧化增重比电极材料更大。
High-energy micro-arc alloying technology (HEMAA) was used to prepare NiAl intermetallic compound alloying layer on K3 superalloy. Through repeated experiments, the appropriate output power, deposition time, frequency and other process parameters were screened to obtain a uniform and dense microcrystalline alloyed layer, and metallurgical bonding between the alloyed layer and the substrate was achieved. The microstructure of the alloying layer, electrochemical corrosion at room temperature and high temperature oxidation were studied. The corrosion resistance of the NiAl microcrystalline alloy layer is higher than that of the electrode material, no matter in the acidic chloride ion or in the acidic chloride ion free solution. At 1000 ℃, the high temperature oxidation performance shows that both the alloyed layer and the electrode material form a continuous, dense and highly adherent Al2O3-rich oxide film. However, due to hot cracking during the preparation of the alloying layer, Ni Of the oxide, so that its oxidation weight gain greater than the electrode material.