As Coated Compounding of Intermetallics from Feedstock of High and Low Melting Points by Cold Spraying

• DOI: 10.31399/asm.cp.itsc2012p0329
• Publication Date: 2023-01-09T08:38:55Z
• Authors: K. H. Ko; J. O. Choi; H. Lee
• Keywords: Particle (ecology)

Abstract It is well known that the inlet temperature of spray gas influences impact velocity particles which, in turn, affects mechanical and chemical properties final coating. From cold high- and-low-melting-point feedstock such as Cu-Sn, it was found those effects can vary with changes particle shape size. Copper powder feedstocks different shapes, dendritic (under 25 μm), were selected for analysis. For spherical 10 μm) powders Cu6Sn5, an intermetallic compound (IMC) Cu-Sn formed as-coated state at above temperatures 100 °C. A least 300 °C needed Cu powders. As increase, another IMC, Cu3Sn, also formed. The onset formation additional IMC 450 both shapes. Below °C, Sn solid thermodynamic driving forces drawn from energy. Therefore, had more stored energy (strains) than to initiate formation.