高速电弧喷涂层的弹性模量  

Measuring of Young’s modulus of coatings by high velocity arc spraying

作　　者：徐连勇[1] 荆洪阳[1] 霍立兴[1] 张玉凤[1] 马崇[2] 

机构地区：[1]天津大学材料科学与工程学院,天津300072 [2]天津电力科学研究院,天津300072

出　　处：《焊接学报》2005年第4期13-15,20,共4页Transactions of The China Welding Institution

基　　金：霍英东青年教师科研基金资助项目(81045);国家自然科学基金资助项目(50275107)

摘　　要：介绍了利用复合梁理论测量高速电弧喷涂层弹性模量的方法。通过三点弯曲试验,对高速电弧喷涂FeCrAl层和NiCr层的弹性模量进行了测量,分析认为涂层的固有特性是造成涂层弹性模量远远小于所用丝材的原因。这是因为涂层中气孔等缺陷的存在导致涂层实际体积小于涂层的宏观体积。此外,由于FeCrAl涂层的孔隙率和晶粒尺寸比NiCr层大,故其弹性模量小于NiCr层的弹性模量。An effective three-point bending test based on compound beam theory is introduced. The Young's moduli of FeCrAl coatings and NiCr coatings by high velocity arc spraying are measured through three-point bending test. The results show Young's modulus of coatings are much less than that of corresponding spraying wire. The analysis indicates that the lower Young's modulus is induced by inherent characters of coatings. The flaws, such as pores in the coatings, result in that the actual bulk of coating is less than macroscopical bulk of coating. The reason that Young's modulus of FeCrAl coatings is less than that of NiCr coatings is that the porosity and metal particle size of FeCrAl coatings are larger than those of NiCr coatings.

关 键 词：高速电弧喷涂层 弹性模量 复合梁 三点弯曲 孔隙率 

分 类 号：TG174.442[金属学及工艺—金属表面处理]