Fabrication and Mechanical Properties of Composite Structure by Warm Spraying of Zr-Base Metallic Glass

Abstract

Metallic glasses are highly attractive because of their superior strength, relatively low Young's modulus and superb corrosion resistance[S1], etc. By combining a metallic glass with different materials, synergy effect can be expected in the mechanical properties and corrosion resistance, for example. Fabricating a thick metallic glass layer on a substrate material by thermal spray process is one way to bond these materials. In such practice, however, the temperature of the sprayed metallic glass and that of the substrate must be kept relatively low in order to avoid crystallization and/or oxidation of the amorphous deposits. Warm Spray is a modified version of HVOF spraying developed by National Institute for Materials Science (NIMS) suited for spraying of heat sensitive feedstock materials. In the process, high-velocity solid particles heated to the temperatures below its melting point are projected on to the substrate. A Zr-base metallic glass powder was warm sprayed onto cylindrical substrates of 316L stainless steel to various thicknesses. Negligible crystallization and oxidation were observed in the deposited layer of the glass alloy. The linear relationship between the thickness of the glass alloy layer and the Young's modulus of the composite bar demonstrated that the mechanical property of such composite structures can be controlled.

Warm spraying—a novel coating process based on high-velocity impact of solid particles

“…The feedstock powder was amorphous, with no obvious peaks except the hallow peak at approximately [30][31][32][33][34][35][36][37][38][39][40] • . The deposit prepared by warm spraying shows very small peaks assigned to ZrO 2 .…”

Current status and future prospects of warm spray technology☆

“…Microstructure and mechanical properties of WS coatings have been investigated for materials such as titanium, copper, aluminum, metallic glass, WC-Co cermet, nanograin titanium oxide, UHMW-PE, and PEEK (Watanabe et al, 2007a,b;Chivavibul et al, 2008Chivavibul et al, , 2010Kawakita et al, 2008b;Kim et al, 2008Kim et al, , 2009aKim et al, ,b,c, 2010a. Among them, titanium and WC-Co have been most extensively studied due to their potential application importance and sensitivity to thermal degradation.…”

Development of WC-Co Coatings Deposited by Warm Spray Process

“…Compared to the cold spray deposition, this technique provides a capability to control the temperature of sprayed particles in a wide range. The success of using this technique to deposit various materials (Ref [17][18][19][20] such as titanium and metallic glass has been reported. Recently, Watanabe et al (Ref 11,18) demonstrated a capability of this technique to deposit WC-12Co coating.…”