Adhesion strength of Cu coating on substrate at different temperatures

Abstract

Flattening of an individual particle on the substrate is a unit cell for the coating formation in plasma spraying. In this study, individual Cu splats and coatings were collected on the AISI304 substrates at different temperatures by plasma spraying. Microstructures of the splats and coatings were observed by scanning electron microscope, and the adhesion strength of each coating was measured by tensile test. The coating hardness was also evaluated. The splats collected on the unheated substrate performed as splash shape, while most of the splats collected on the substrate at high temperatures exhibited as regular disc type. In particular, less nanopores could be found at the bottom surface of the disc shaped splats. The coating adhesion strength increased dramatically from 22 to 63 MPa with the increase in substrate temperature; the coating hardness also increased with the increase in substrate temperature. Accordingly, the coating performance has a close relation with the splats flattening behaviour on the substrates surface.

A critical review of copper electroless deposition on glass substrates for microsystems packaging applications

“…Electroless nickel has phosphorus since it uses sodium hypophosphite as a reducing agent, making it amorphous [155]. During annealing, notable changes occur in the properties and the crystal structure of the seed layer [156-161]. A crystalline structure appears as the grain boundaries disappear, improving adhesion.…”

Effect of 60Coγ ray irradiation on adhesion of LIE coatings

“…As it is evident, the data in Figure 3 suggests that the adhesion increases by increasing the irradiation dose up to 50 kGy. In general, according to chemical bonding mechanism of the adhesion in substrate and coating systems [19,20], large numbers of Si-O-Fe chemical bonds obtained during cross-linking of the irradiated silicate binder are the bonding improvement mechanism of the adhesion between the coating and the substrate. When the silicate binder is irradiated by 60 Coγ ray (1.25 eV).…”

Influence of processing conditions on the mechanical, tribological and fatigue performance of cold spray coating: a review

“…This process has lots of advantages such as wrought-like microstructures, high deposition rate, low oxidation, no bulk powder particle melting, no grit blast and no fuel gases needed to melt the power particle. Except these benefits, CS is portable, enables thicker coatings, ultra-thick coatings (5-50 mm) can be developed, and it can be utilized to spray temperature-sensitive materials (polymers, glass) and softer as well as oxygen-sensitive materials (Ti, Al, Cu) to produce protective coatings [6][7][8][9]. Due to these attractive properties, cold spray is widely used in turbine industries, aeronautical, defense, marine, offshore, automotive, biomedical, thermal and nuclear power plant, Comparison of cold spray process with other thermal spray processes in terms of particle velocity, carrier gas temperature and temperature of substrate material [6].…”

“…Due to these attractive properties, cold spray is widely used in turbine industries, aeronautical, defense, marine, offshore, automotive, biomedical, thermal and nuclear power plant, etc. [8-12]. Yet, there are still some disadvantages of cold spray processes.…”