摘要
利用超音速火焰喷涂(HVOF)技术制备了普通、超细纳米WC-17Co涂层。研究了喷涂粉末、涂层的微观组织结构和物相成分,测试了涂层的显微硬度、弹性模量、断裂韧性。研究表明,纳米WC-17Co涂层中形成了纳米尺度的胞状结构和长条状结构,并有网状的非晶结构生成。WC-17Co涂层表面均匀致密,3种涂层均是由熔化再结晶区、半熔化区和未熔化区等构成。涂层中条带结构不明显,明显区别于等离子涂层。纳米涂层组织结构更致密,碳化物颗粒分布更均匀。3种涂层中,WC都是主相,W2C、Co6W6C的含量很少。纳米涂层的显微硬度、弹性模量、断裂韧性最高。
Conventional, ultra-fine and nanostructured WC-Co coatings are obtained by means of the high velocity oxygen flame （HVOF） technique. The microstructure of the powders and coatings are analyzed. The phases of the powders and coatings are analyzed too. The microhardness, Young＇s modulus and fracture toughness are compared too. The results show that there forms nano-sized cell structure, lath structure and amorphous structure in nanostruc- tured WC-17Co coatings. The coating structures are dense, which are formed of the re-crystallized zone, partially mel- ted zone and non-melted zone. The lamellar structure of the coatings is not obvious which is different from the APS coatings. The nanostructured coatings are more denser and the carbide particles distribution is more even. The WC is the main phase and W2C,Co6WsC are little. The mocrohardness, Young＇s modulus, and fracture toughness are best in the three kinds of coatings.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2009年第2期47-50,56,共5页
Materials Reports
基金
西南交通大学青年教师科研起步项目(2007Q034)
成都市科技攻关项目(07GYB579GX-010)
关键词
纳米涂层
WC-17Co
弹性模量
断裂韧性
nanostructured coating, WC-17Co, Young＇s modulus, fracture toughness
