High-speed Friction and Wear Performance of NiCrAlY Coating Electrospark Deposited on CrNi3MoVA Steel
YANG Junbao1, WANG Yuanchao1, QU Jiahui1, GUO Qiuping2, JIN Hao1,3, GUO Cean1, ZHANG Jian1
1 School of Equipment Engineering, Shenyang Ligong University, Shenyang 110159; 2 Department of Military Representatives in 474 Factory, Fushun 113003; 3 School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870;
Abstract: A NiCrAlY coating was electrospark deposited on surface of a CrNi3MoVA steel. The hardness, elasticity modulus and friction coefficient of the CrNi3MoVA steel and NiCrAlY coating were tested by employing the nanoindentor and the friction and wear testing machine, respectively, and then morphologies and composition were investigated before and after wearing by utilizing scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectrum (EDS). The results indicated that the NiCrAlY coating with columnar structure, composed of β-NiAl and γ-Ni, belongs to microcrystal one. The hardness of the NiCrAlY coating increased by 22% than the CrNi3MoVA steel whilst the elasticity modulus reduced by 21%; when the quenched G15 steel ball was used as the friction pair under the wear condition that the load was 10 N, the reciprocating travel was 10 millimeter and the velocity was 600 rounds per minute, the steady friction coefficient of the CrNi3MoVA steel was 0.65-0.75 while that of the NiCrAlY coa-ting was 0.45-0.55. Therefore the NiCrAlY coating electrospark deposited on the CrNi3MoVA steel has the function of antifriction and wear resistance mainly due to its higher hardness and good adherent thin surface oxide layer formed during high-speed friction; the mechanism of the CrNi3MoVA steel can be characterized as adhesive wear while that of the NiCrAlY coating is microcutting abrasive wear.
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2017, Vol. 31 
