等离子喷涂CNTs/Al_2O_3复合涂层力学性能研究  

Mechanical Properties of Plasma Sprayed CNTs/Al_2O_3 Composite Coatings

作　　者：周亮[1] 罗发[2] 孙志平[1] 张勇[1] 

机构地区：[1]长安大学材料科学与工程学院,西安710064 [2]西北工业大学凝固技术国家重点实验室,西安710072

出　　处：《材料导报》2014年第18期63-65,94,共4页Materials Reports

基　　金：国家自然科学基金(51302018);西北工业大学凝固技术国家重点实验室开放课题资助(SKLSP201319)

摘　　要：通过等离子喷涂工艺制备了不同碳纳米管含量的CNTs/Al2O3复合涂层,系统研究了碳纳米管含量对涂层孔隙率、洛氏硬度和断裂韧性的影响规律。实验结果表明:采用喷雾干燥工艺制备的CNTs/Al2O3颗粒为球形,CNTs均匀分布在团聚颗粒的表面;部分CNTs经等离子喷涂后保留在沉积涂层内部并且与Al2O3基体形成冶金结合,起到一定桥接作用。涂层孔隙率和洛氏硬度值均随CNTs含量的增加呈现降低的趋势。随CNTs含量从6%(质量分数)增加到12%(质量分数),CNTs增韧效果的增强和涂层孔隙率的降低导致涂层断裂韧性值从48MPa增加到90MPa。CNTs/Al2O3 composite coatings with different CNTs content were fabricated by plasma spraying technology.The influence of CNTs content on porosity,Rockwell hardness and fracture toughness of CNTs/Al2O3 coatings was investigated.The results show that the spray-dried CNTs/Al2O3 agglomerated particles were spherical shape and the CNTs were uniformly dispersed on the surface of the spray-dried particles; part CNTs are preserved in the coatings and act as bridges,creating good metallurgical bonding with Al2O3 matrix.The porosity and Rockwell hardness of the coatings decrease with the increase of CNTs content.Meanwhile,due to the enhancement of toughness and the decrease of porosity induced by the increase of CNTs content from 6％ to 10％,the fracture toughness values of the composite coating increase from 48 MPa to 90 MPa.

关 键 词：等离子喷涂 微观结构 断裂韧性 CNTs/Al2O3涂层 

分 类 号：TB332[一般工业技术—材料科学与工程]