摘要
采用激光熔注技术在Ti6Al4V表面制备了纳米团聚ZrO_2陶瓷颗粒增强ZrO_2/Ti6Al4V功能复合材料层,采用金相显微镜以及扫描电镜对激光熔注层的微观组织以及纳米结构ZrO_2陶瓷颗粒的形态演变进行了观察与分析。结果表明,在合适的工艺参数条件下,可获得成形良好的激光熔注层,ZrO_2颗粒分布于整个熔注层中并达到熔池底部。熔注层的平均深度为0.5mm。在熔注层顶部ZrO_2陶瓷颗粒基本保持原始形态。随着进入深度的增加,纳米团聚ZrO_2颗粒逐步发生离散分解。熔注层中ZrO_2陶瓷颗粒与金属基体之间形成了良好的冶金结合。
Nano-agglomerated particle reinforced ZrO2/Ti6Al4 V composites layer on the surface of Ti6Al4 V was produced by laser melt injection（LMI）. Microstructure of the LMI layer and morphological evolution of nano-structured ZrO2 particles during LMI process were analyzed by OM and SEM. The results show that a well-formed LMI layer can be obtained under appropriate process parameters condition. ZrO2 particles distributed in the whole region of the melt pool and can be injected to the bottom of the melt pool. The average thickness of LMI layers is 0.5mm. On the top of LMI layers, ZrO2 particles retain original shape basically. With the increase of the depth to which ZrO2 are injected in the LMI layer, nano-agglomerated ZrO2 particles disperse gradually. The ZrO2 particles exhibit a good metallurgical bonding with the metal matrix in LMI layers.
出处
《航天制造技术》
2017年第1期17-19,33,共4页
Aerospace Manufacturing Technology
关键词
激光熔注
纳米团聚
ZRO2
微观组织
laser melt injection
nano-agglomerated
ZrO2
microstructure
