镍铝材料状态对火焰喷涂层组织结构和性能的影响

针对煤矿机械液压支柱热喷涂修复中涂层结合强度低的实际,研究了在27SiMn钢基体上火焰喷涂新研制的镍铝合金丝制备镍铝涂层,并与火焰喷涂镍包铝粉末、镍铝复合丝制备的镍铝涂层在组织结构、表面形貌、结合强度等方面进行了比较分析.结果表明,镍铝合金丝制备的涂层与基体之间主要为冶金结合,结合强度比镍包铝粉末涂层提高46.8％,比镍铝复合丝涂层提高8％,涂层组织结构致密,气孔率低、质杂少.

Effect of Nickel-Aluminium State on Constitution and Properties of Flame-sprayed Coatings

Aiming at the actual instance of low bonding strength of thermal spray coating in the restoration of hydraulic props for mining machinery,new developed nickel-aluminum alloy wire was utilized to deposite Ni-Al coating on 27SiMn steel substrate by flame spraying.The microstructure,morphology and bonding strength of the coating was compared with those of the coatings prepared with nickel coated aluminium powders and composite nickel-aluminium wire.The results show that the metallurgical bonding exists as the main bonging between the coating prepared with pre-alloyed nickel-aluminium and the substrate,and the bond strength is improved by 46.8% and 8%,respectively,compared with that of nickel coated aluminium powder and composite nickel-aluminium wire.The prepared coating is compact in constitution,with less porosity and impurity.