首页> 外文期刊>DVS-Berichte >Comparison of oxidation and microstructures of warm-sprayed and cold-sprayed titanium coatings
【24h】

Comparison of oxidation and microstructures of warm-sprayed and cold-sprayed titanium coatings

机译:热喷涂和冷喷涂钛涂层的氧化和微观结构比较

获取原文
获取原文并翻译 | 示例
获取外文期刊封面目录资料

摘要

Thick titanium coatings were prepared by warm spraying (WS) and cold spraying (CS) process to investigate the oxidation and microstructure of the coating layers. Prior to the coating formations, the temperature and velocity of in-flight titanium powder particle were numerically calculated. Significant oxidation occurred in WS process using higher gas temperature conditions with low nitrogen flow rate, which is mixed to the flame jet of an HVOF spray gun in order to control the temperature of the propellant gas. Oxidation, however, decreased strikingly as the nitrogen flow rate increased. In CS process using nitrogen or helium as a propellant gas, little oxidation was observed. Although most of the cross-sections of the coating layers prepared by conventional mechanical polishing looked dense, coating cross sections prepared by an ion-milling method revealed the actual microstructures containing small pores and unbounded interfaces between deposited particles. Even when scanning electron microscopy or x-ray diffraction method did not detect oxides in the coating layers by WS using high nitrogen flow rate or CS using helium, the inert gas fusion method revealed minor increase of oxygen content below 0.3 wt%.
机译:通过热喷涂(WS)和冷喷涂(CS)工艺制备了厚厚的钛涂层,以研究涂层的氧化和微观结构。在形成涂层之前,数值计算飞行中钛粉颗粒的温度和速度。在WS工艺中,使用较高的氮气温度和较低的气体温度条件会发生明显的氧化,然后将其混合到HVOF喷枪的火焰喷嘴中,以控制推进剂气体的温度。但是,随着氮气流量的增加,氧化作用显着下降。在使用氮气或氦气作为推进剂气体的CS工艺中,几乎观察不到氧化。尽管通过常规机械抛光制备的涂层的大多数横截面看起来是致密的,但是通过离子铣削方法制备的涂层的横截面显示出实际的微观结构,其包含小孔和沉积颗粒之间的无界界面。即使当通过高氮流速的WS或使用氦气的CS通过扫描电子显微镜或X射线衍射法未检测到涂层中的氧化物时,惰性气体熔融法也显示出氧含量在0.3 wt%以下的增加很小。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号