Hits:

Indexed by:期刊论文

Date of Publication:2010-12-01

Journal:4th Asian Thermal Spray Conference (ATSC)

Included Journals:SCIE、EI、CPCI-S、Scopus

Volume:19

Issue:6

Page Number:1155-1162

ISSN No.:1059-9630

Key Words:bow shock; cold gas dynamic spray; impact velocity; numerical simulation; substrate angle; Three-dimensional model

Abstract:Numerical study was conducted to investigate the effect of substrate angle on particle impact velocity and normal velocity component in cold gas dynamic spraying by using three-dimensional models based on computational fluid dynamics. It was found that the substrate angle has significant effect on particle impact velocity and normal velocity component. With increasing the substrate angle, the bow shock strength becomes increasingly weak, which results in a gradual rise in particle impact velocity. The distribution of the impact velocity presents a linearly increase along the substrate centerline due to the existence of the substrate angle and the growth rate rises gradually with increasing the substrate angle. Furthermore, the normal velocity component reduces steeply with the increase in substrate angle, which may result in a sharp decrease in deposition efficiency. In addition, the study on the influence of procedure parameters showed that gas pressure, temperature, type, and particle size also play an important role in particle acceleration.