Laser fabrication nanocrystalline coatings using simultaneous powders/wire feed

作者：Li, Jianing^*; Zhai, Tongguang; Zhang, Yuanbin; Shan, Feihu; Liu, Peng; Ren, Guocheng

来源：Physica E: Low-Dimensional Systems and Nanostructures , 2016, 81: 44-48.

DOI：10.1016/j.physe.2016.02.014

• Metal-matrix composites (MMCs)
• Surface properties
• Nanocrystalline materials
• Lasers

Laser melting deposition (LMD) fabrication is used to investigate feasibilty of simultaneously feeding TC17 wire and the Stellite 20-Si3N4-TiC-Sb mixed powders in order to increase the utilization ratio of materials and also quality of LMD composite coatings on the TA1 substrate. SEM images indicated that such LMD coating with metallurgical joint to substrate was formed free of the obvious defects. Lots of the ultrafine nanocrystals (UNs) were produced, which distributed uniformly in some coating matrix location, retarding growth of the ceramics in a certain extent; UNs were intertwined with amorphous, leading the yarn-shape materials to be produced. Compared with substrate, an improvement of wear resistance was achieved for such LMD coating.

• 出版日期2016-7
• 单位中国航空工业集团公司北京航空制造工程研究所; 山东建筑大学