冷喷涂不同陶瓷含量Cu-Ti_(3)SiC_(2)复合涂层的微观组织及性能研究

Microstructure and Properties of Cold Sprayed Cu-Ti_(3)SiC_(2) Composite Coatings with Different Ceramic Contents

为获得摩擦学性能优良的金属-陶瓷复合涂层,采用冷喷涂技术在铜合金上制备了不同陶瓷含量的Cu-Ti_(3)SiC_(2)复合涂层。通过扫描电镜、纳米压痕仪、电子万能试验机、往复式摩擦试验机等对不同陶瓷含量的Cu-Ti_(3)SiC_(2)复合涂层进行了组织结构、力学性能和摩擦学性能的表征、分析。研究发现,Cu-Ti_(3)SiC_(2)复合涂层与对7075铝合金干摩擦过程中的主要磨损机制是粘着磨损,耐磨性能较好的涂层主要有两个特点:一是具备较好的力学性能,抗塑性变形能力较强;二是Ti_(3)SiC_(2)含量较高,可有效减少摩擦过程中Al的粘着。陶瓷含量过高时涂层内聚强度降低,相应力学和摩擦学性能下降。结果表明,适当增加陶瓷可有效提高涂层的致密度、结合强度,提升涂层的力学性能,增强涂层的耐磨性。

In order to obtain metal-ceramic composite coatings with excellent tribological properties,Cu-Ti_(3)SiC_(2)composite coatings with different ceramic contents were prepared on copper alloy by cold spraying technology.The microstructure,mechanical properties and tribological properties of Cu-Ti_(3)SiC_(2)composite coatings with different ceramic contents were characterized and analyzed by scanning electron microscope,nano indentation instrument,electronic universal testing machine and reciprocating friction test.The main wear mechanism between Cu-Ti_(3)SiC_(2)composite coating and 7075 Al alloy is adhesive wear during dry friction.The coating with better wear resistance has two main characteristics,as follow:first,it has better mechanical properties and stronger plastic deformation resistance;second,Ti_(3)SiC_(2)content is high,which can effectively reduce the adhesion of Al in the friction process.It is found that proper ceramic content can effectively improve the mechanical properties of the coa-ting,reduce the porosity of the coating and enhance the wear resistance of the coating.