为了解环境压强对热喷涂熔滴沉积行为及涂层性能的影响机理,采用低压等离子喷涂装置在不同压强下向不锈钢SUS304基体上喷涂Ni粉末,在基体上收集一定数量的熔滴沉积物及涂层.采用光学显微镜、扫描电镜与聚焦离子束技术等对单个熔滴沉积物的形态进行观察分析,对不同压强下制备的涂层的微观组织、氧含量及结合强度等进行表征.对不同压强下基体表面吸附质的脱附/吸附、熔滴与基体间润湿能力、热传导及界面处的初期凝固等因素对熔滴在基体表面沉积行为的影响进行探讨.结果表明:单个熔滴的沉积形态由常压下的溅射状沉积到低压下的规则盘状沉积;不同压强下均可得到致密涂层,且涂层的结合强度随环境压强降低而逐渐增加,其变化趋势与单个熔滴沉积物形貌随压强变化趋势相吻合,可见熔滴的沉积行为对涂层的性能有着重要的影响.
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