Self-Bonding Effect Development for Plasma Spraying of Stainless Steel Coating Through Using Mo-Clad Stainless Steel Pow
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https://doi.org/10.1007/s11837-020-04395-y Ó 2020 The Minerals, Metals & Materials Society
SURFACE ENGINEERING: APPLICATIONS FOR ADVANCED MANUFACTURING
Self-Bonding Effect Development for Plasma Spraying of Stainless Steel Coating Through Using Mo-Clad Stainless Steel Powders XIAN-JIN LIAO,1,2 LI ZHANG,1 XIN-YUAN DONG,1 XU CHEN,1 XIAO-TAO LUO,1 and CHANG-JIU LI1,3 1.—State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi Province, People’s Republic of China. 2.—Jiangxi Key Laboratory of Advanced Copper and Tungsten Materials, Jiangxi Academy of Sciences, Nanchang 330029, Jiangxi Province, People’s Republic of China. 3.—e-mail: [email protected]
The limited inter-lamellar bonding in the conventional thermal-sprayed 304SS coating usually leads to much lower corrosion and wear resistance than their bulk counterparts. In this study, Mo-clad stainless steel 304SS-17Mo powders prepared by mechanical alloying were used for plasma spraying to generate ultra-high-tempertature droplets to deposit the coatings with enhanced inter-lamellar bonding. The temperature at the interface between the molten splats and the stainless steel was calculated by numerical simulation, and the surface temperature of in-flight particles was measured by a commercial thermal spray particle diagnostic system. The microstructures of the coatings after etching were characterized to reveal inter-lamellar bonding. The adhesive and cohesive strengthes of the coatings were estimated by tensile and scratch tests. The measurement of the in-flight particle temperature reveals the possibility of creating a self-bonding effect, which is confirmed by microstructure examination, high adhesion over 66 MPa, and cohesion of 221 MPa.
INTRODUCTION Austenite stainless steel of 304SS is widely used in the fields of automobile parts, acid resistance equipment, ship parts, aerospace instruments, and so on for its excellent corrosion resistance, plasticity, toughness, work-hardening property, and wear resistance. Due to its excellent performance of corrosion resistance and wear resistance, a plasma-sprayed 304SS coating is also used in those environments. However, a traditional plasmasprayed coating with a layer structure and limited lamellar bonding makes it difficult to play the role of a protective coating such as bulk stainless steel.1–4 The traditional plasma-sprayed coating with a lamellar structure includes two kinds of interfaces. One is the interface between the first layer of the coating and the substrate, and the other is the intersplat interfaces within the coating. These determine (Received June 24, 2020; accepted September 16, 2020)
the microstructure, the adhesive and cohesive strengths of the coating, and subsequently its corrosion and wear resistance in service.5–7 The coating adhesion and cohesion depend on the bonding nature, including chemical bonding and physical contacts at the interfaces. It is generally considered that chemical or metallurgi
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