摘要
将高纯度的C,BN机械混合粉末预涂在TC4钛合金表面,采用5 kW横流CO2激光器进行激光熔覆,原位生成高硬度复合涂层。利用光学显微镜(OM)、扫描电镜(SEM)和能量弥散X射线探测器(EDXs)等观察和分析熔覆层的微观组织和成分,测试了熔覆层的硬度。结果表明,以C,BN机械混合粉末为原料,利用激光熔覆原位生成技术生成了树枝晶状的复合熔覆层,熔覆层与基体冶金结合。熔覆层显微硬度值最高可达1454 HV0.5,显著地提高了TC4合金的硬度。
The mechanical mixed C＋BN powders were cladded on the surface of TC4 alloys by transverse flow CO2 laser,and hard composite coating was in-situ formatted.The microstructure of clad layers were observed and analyzed by Optical Microscope（OM）,Scanning Electronic Microscope（SEM）and Energy Dispersive X-ray spectroscope（EDXs）.The microhardness of clad layers was measured.The results show that clad layers with fine interdendritic crystal are in-situ formed successfully by laser cladding with the precursor mixture of carbon,boron nitride（C＋BN）powders.The metallurgical combining interface between the clad layer and substrate is achieved and the highest microhardness of clad layers is reached to 1454 HV0.5,leading to remarkable surface hardness enhancement of the TC4 alloy.
出处
《激光与红外》
CAS
CSCD
北大核心
2010年第5期459-462,共4页
Laser & Infrared
基金
湖南省自然科学基金项目(No.05JJ30092)
湖南省高等学校科学研究项目(No.09C856)资助
关键词
激光熔覆
TC4钛合金
原位生成
复合涂层
laser cladding
TC4 titanium alloys
in-situ formation
composite coating
