HVOF sprayed Ni3Ti and Ni3Ti+(Cr3C2+20NiCr) coatings: Microstructure, microhardness and oxidation behaviour

被引：38
作者：
Reddy, Nagaraja C. [1 ]
Kumar, B. S. Ajay [1 ]
Reddappa, H. N. [1 ]
Ramesh, M. R. [2 ]
Koppad, Praveennath G. [3 ]
Kord, S. [4 ,5 ]
机构：
[1] Bangalore Inst Technol, Dept Mech Engn, Bengaluru 560004, India
[2] Natl Inst Technol, Dept Mech Engn, Surathkal 575025, India
[3] Rapsri Engn Prod Co Ltd, Res & Dev, Harohalli 562112, India
[4] Pasteur Inst Iran, Dept Biomat, Tehran, Iran
[5] KN Toosi Univ Technol, Fac Mat Sci & Engn, Tehran, Iran
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2018年 / 736卷
关键词：
High velocity oxy-fuel process; X-ray diffraction; Hardness; Oxidation; Electron microscopy; HIGH-TEMPERATURE OXIDATION; MECHANICAL-PROPERTIES; NICRALY COATINGS; CORROSION BEHAVIOR; CYCLIC OXIDATION; RESISTANCE; ALLOY; NI-20CR;
D O I：
10.1016/j.jallcom.2017.11.131
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
This paper reports the development of Ni3Ti and Ni3Ti+(Cr3C2+20NiCr) coatings on AISI 420 stainless steel (MDN-420) and titanium alloy ASTM B265 (Ti-15) by HVOF technique. Microstructure, microhardness and high temperature oxidation behaviour of coatings were investigated. Microstructure of coatings was dense and displayed layers depicting lamellar structure. The microhardness of coatings was significantly higher than that of substrate owing to higher density and cohesive strength between individual splats of coating materials. Cyclic oxidation studies conducted on Ni3Ti and Ni3Ti+(Cr3C2+20NiCr) coatings showed oxide scale was composed of various oxides like NiO, NiCr2O4 and Cr2O3 phases. The formation of compact and protective NiO phase in case of Ni3Ti coatings; NiO and Cr2O3 phases in Ni3Ti+(Cr3C2+20NiCr) coatings stabilised the weight gain exhibited slow oxidation rate at higher temperatures. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码：236 / 245
页数：10
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