摘要
采用DZ-1600型电火花沉积设备在不锈钢表面电火花沉积MCrAlY涂层,研究了工艺参数对沉积效率的影响以及涂层的组织结构和抗氧化性能之间的关系。结果表明,沉积效率与输出功率成正比,频率对沉积效率几乎无影响。涂层表面呈"泼溅状"形貌,整体呈现纳米级微晶堆垛结构,反映了沉积过程的快速冷凝机制。XRD分析结果显示,高温氧化后在涂层表面形成的氧化膜主要由Al2O3组成。在1000℃空气中氧化200h的结果表明,获得的MCrAlY涂层具有优异的抗高温氧化与抗剥落性能。
MCrAlY coatings were deposited on the surface of stainless steel （Fe-18Cr-8Ni） specimens with DZ-1600 electrospark deposition （ESD） device. The effect of processing parameters on depositing efficiency and the relationship between microstructure and oxidation resistance performance of the coatings were studied. The results indicate that depositing efficiency is in proportion to the output power of ESD, but no significant effect of frequency on depositing efficiency is observed. Spattered morphology was observed on the surface of the coatings by SEM. Uniform nano-grains with a stacking structure in the coatings is found. The structure reveals the mechanism of quick solidifying process during deposition. The results of XRD analysis show that the oxide film on the coatings after high temperature oxidation is mainly composed of alumina. The results of isothermal oxidation tests in air at 1000℃ for 200h indicate that the coatings possess excellent oxidation and spallation resistance.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2008年第4期143-147,共5页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金项目(50401017)
关键词
电火花沉积
MCRALY涂层
高温氧化
electrospark deposition （ESD）
MCrAlY coating
high temperature oxidation
