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利用METCO 6P-Ⅱ火焰喷涂制备NiCrFeAl/h-BN.SiO2可磨耗封严涂层,采用SiO2对NiCrFeAl/h-BN进行改性,改善涂层的可磨耗性。采用不同氧气/乙炔流量比(氧燃比)制备可磨耗封严涂层,并对涂层抗冲刷性能进行评价。结果显示:NiCrFeAl在喷涂过程中熔化并包覆h-BN和SiO2粒子;随氧燃比的升高,金属相熔化更加充分,h-BN和SiO2粒子在涂层中分布的均匀性提高,涂层表面洛氏硬度由50.8 HR15Y提高到70.3 HR15Y,结合强度升高;涂层冲刷后形貌表现出粘着磨损和磨粒磨损特征,冲刷表面粗糙度随氧燃比升高而降低,金属相对非金属相的充分包裹提高了涂层的内聚力,涂层质量损失降低,抗冲刷性能提高。 相似文献
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A new method has been studied to obtainTiN-Ti(C,N)composite film by laser-induced re-action in order to modify the surface properties ofsubstrate.An apparatus for this new technology hasbeen developed.The main reaction,the influence ofmain processing parameters on the formation,composition,microstructure and properties of thefilm have been researched.The average hardness ofthe film is up to HK 2700-2800.The wear resist-ance of the film is higher than that of the substrateby a factor of 9-11;and the film has good adhesivestrength with the substrate. 相似文献
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在解剖国外钎焊料BNi-A的基础上,采用"预制母合金+超声气体雾化"工艺技术以及对国产BNi-B及国外BNi-A钎焊料粉末的化学成分、金相组织、粒度分布及固-液相线温度区间对比分析,成功实现相关制粉技术突破与材料国产化,研制出满足技术要求的合金钎焊料粉末。 相似文献