还原性保护气氛电弧喷涂技术研究

Study on Active Protection Arc Spray Technology

一般情况下 ,在电弧喷涂中利用空气作为雾化气体 .空气作为雾化气体将导致熔滴的氧化 ,从而影响涂层的粒子尺寸、孔隙、结合强度和硬度 .保护气氛电弧喷涂采用二次雾化的原理 ,使用还原性气体和压缩空气作为雾化气体 ,能够降低涂层中的氧化物质量分数 ,减少涂层中合金元素的烧损 .实验结果表明 ,保护气氛电弧喷涂3Cr13涂层组织致密 ,氧化物的质量分数明显减少 ,硬度和结合强度显著提高 .该技术在贵重零部件的修复领域具有广阔的应用前景 .

Traditionally,the employed atomizing gas in arc spraying is compressed air,which causes the drops of melting metal to be oxidized.Oxides can have other detrimental effects on coatings,such as particle size,porosity,bond strength and hardness.With both active gas and compressed air as atomizing gas,the active protection arc spray is performed with a double jet system.It can lower oxide content and reduce alloying element consumption.The 3Cr13 coating produced by active production arc spray has dense structure and low oxide content.The high hardness and bond strength of 3Cr13 coating have been greatly improved.This technique has attractive prospect in application to maintenance of critic and valuable parts equipments.