Process Development of D–Gun Sprayed NiCrAl Coating for Dimensional Build-Up
WANG Bo1,2, LIU Yang3, SHAO Jianwei1，2, PENG Xin4, YUAN Fuhe2
1. Beihang University, Beijing 100191, China;
2. AECC Shenyang Liming Aero-Engine Co., Ltd., Shenyang 110043, China;
3. Luxun Academy of Fine Arts, Shenyang 110004, China;
4. Shenyang Area 2nd Military Representative Room of Air Force Equipment Department, Shenyang 110042, China
Based on the orthogonal experiment, effects of power particle size, oxygen-fuel ratio, flow rate of carrier N2 and spray distance on microscopic structure and mechanical properties of D–gun sprayed NiCrAl coatings were investigated. The characterizations of microstructure of as-sprayed coatings were analyzed by SEM. The influence of four factors on the coating properties was studied by testing the porosity, microhardness and tensile bonding strength of the coating. The optimized process parameters of the D–gun sprayed NiCrAl coatings were particle size 13–45 μm, oxygenfuel ratio 1.25, flow rate of carrier N2 20 L/min and spray distance 170 mm. An NiCrAl coating for dimensional build-up application with uniform, dense microstructure, high hardness and adhesive strength was achieved through the D–gun spray process optimization.
2023, 
