高速燃气电弧喷涂的涂层过渡特性

高速燃气电弧（HVAF-ARC）喷涂是20世纪90年代末期兴起的一种电弧喷涂技术，可用于电站锅炉“四管”表面防腐防磨工程。为此，对HVAF-ARC喷涂技术进行工艺性能研究，并分别对FeNiCr-WC和FeNiCr-Cr2G涂层过渡特性进行了比较。由于超音速活性电弧气氛对丝材有良好的雾化效果，因此两种涂层材料与基材的结合都很好，在扫描电镜观察下，均未发现有连续间隙存在。对涂层试样进行结合强度试验，结果是FeNiCr-WC涂层的结合强度比FeNiCr-Cr2C3涂层要高10％左右。最后，对两种涂层的X射线衍射结果进行了分析，发现FeNiCr-Cr2G3丝材组分Cr2C3在活性电弧气氛中会加速分解，而FeNiCr-WC丝材组分WC的分解则不明显。结论是FeNiCr-WC涂层的过渡性能优于FeNiCr-Cr2G3涂层。

Transition Characteristics of High-velocity Air-fuel Arc Spraying Coatings

High-velocity air-fuel arc(HVAF-ARC) spraying is an arc spraying technique arising in the late 1990s,and can be applied to the corrosion and abrasion preventing engineering for heating surface tubes of utility boilers.In this paper,the procedure of the technique is studied,and the transition characteristics of FeNiCr-WC and FeNiCr-Cr2C3 coatings are compared.Due to the good effect of silk material atomizing by supersonic active arc atmosphere,both the coating materials integrate well with the base material,no continuous gap found by scanning electron microscopy.The results of the bond strength test on the coating samples show that the bond strength of FeNiCr-WC coating is 10% higher than that of FeNiCr-Cr2C3 coating.The analysis of the X-ray diffraction results of the two coatings indicates that the silk material component Cr2C3 of FeNiCr-Cr2C3 decomposes faster in active arc atmosphere,while the decomposition of the silk material component WC of FeNiCr-WC is not conspicuous.It is concluded that the transition property of FeNiCr-WC coating is superior to that of FeNiCr-Cr2C3 coating.