• Nguyen Thanh Phu Hung Yen University of Technology and Education; Ministry of Industry and Trade
  • Dinh Van Chien Hanoi University of Mining and Geology
  • Dao Duy Trung Ministry of Industry and Trade
  • Le Van Thoai Hung Yen University of Technology and Education
  • Doan Thanh Hoa Hung Yen University of Technology and Education
Keywords: Multi-responses optimization, MRWSN, WC-12Co, HVOF spray


In this study, the MRWSN (Multiple Regression-Based Weighted Signal-to-Noise Ratio) multiresponses optimization method is used to determine spray parameters for improving the WC-12Co coating quality by HVOF (High Velocity Oxygen Fuel) spraying. The hardness, adhesion, and porosity of the coating are evalueted through the influence of spray parameters including powder feed rate (A), spraying distance
(B), and the ratio of oxygen/propane (C). With the optimal spray paramters of A = 32gam/min, B = 0.35m, and C = 5, the hardness, adhesion strength and porosity of the obtained coating are 1336.2 HV, 64.7Mpa, 1.83%, respectively. Comparing with results single-response optimization method based on Taguchi method, it is shown that proerties of the coating are significantly improved. The verification experiment with optimal
spray parameters is performed; the obtained results demonstrate the reliability and high efficiency of the MRWSN method. Therefore, one can say that present MRWSN method has sucessfully applied to multiresponses optimization for spay HVOF process


Pawlowski. L,“The Science and Engineering of Thermal Spray Coatings”, India, Wiley, 2008.

Sagar, “A Review on Thermal Spray Coating Processes”, Int. J. Curr. Trends Eng. Res, vol. 2, no. 4, pp. 556–563, 2016.

Karidkar .S, “Optimization of Powder Spray Process Parameters using Taguchi Methodology”, vol. 137, pp. 71–76, 2017.

Qin.Y et al, “Optimization of the HOVF Spray Parameters by Taguchi Method for High Corrosion-Resistant Fe-Based Coatings” J. Mater. Eng. Perform, vol. 24, no. 7, pp. 2637–2644, 2015.

Praveen.A. S, Sarangan. J, Suresh.S, and Channabasappa .B. H,“Optimization and erosion wear response of NiCrSiB/WC-Co HVOF coating using Taguchi method”, Ceram. Int, vol. 42, no. 1, pp. 1094-1104, 2016.

Cho. T. Y. et al, “Surface properties and tensile bond strength of HVOF thermal spray coatings of WC-Co powder onto the surface of 420J2 steel and the bond coats of Ni, NiCr, and Ni/NiCr”, Surf. Coatings Technol, vol. 203, no. 20–21, pp. 3250-3253, 2009.

Fang. W et al, “Processing optimization, surface properties and wear behavior of HVOF spraying WC-CrC-Ni coating”, J. Mater. Process. Technol, 2009.

Murugan. K, Ragupathy .A, Balasubramanian.V, and Sridhar. K, “Optimizing HVOF spray process parameters to attain minimum porosity and maximum hardness in WC-10Co-4Cr coatings”, Surf. Coatings Technol, vol. 247, pp. 90-102, 2014.

Christel Pierlot, Lech Pawlowski, Muriel Bigan, “Design of experiments in thermal spraying: A review”, Surf. Coat. Technol, vol. 202, p. 4483-4490., 2008.

Pal.S and Gauri.S.K, “Multi-response optimization using multiple regression-based weighted signal-to-noise ratio (MRWSN)”, Qual. Eng, vol. 22, no. 4, pp. 336-350, 2010.

Gauri.S.K and Palb. S, “Optimization of multi-response dynamic systems using multiple regression-based weighted signal-to-noise ratio”, Int. J. Ind. Eng. Comput, vol. 8, no. 1, pp. 161-178, 2017.

Nguyễn Thanh Phú, Đinh Văn Chiến, Đào Duy Trung, and Đoàn Thanh Hòa,“Nghiên cứu ảnh hưởng của lưu lượng cấp bột, khoảng cách phun và tỷ lệ oxy/propan đến độ cứng lớp phủ WC-12Co”, Tạp chí Cơ khí Việt Nam, vol. 12, pp. 78–84, 2018.

Taguchi.G, Chowdhury.S, and Wu.Y,“Taguchi’s quality engineering handbook”, 2007.

TCVN-3104, “Tiêu chuẩn thép hợp kim thấp cường độ cao”, 1979.

ASTM-E384-17, “Standard test method for microindentation hardness of materials”, 2011.

JIS-H-8664, “Test methods for build-up thermal spraying”, 2004.

ASTM-B276-05, “Standard test method for apparent porosity in cemented carbides”, 2015.

Nguyễn Đăng Bình, Nguyễn Văn Dự,“Quy hoạch thực nghiệm trong kỹ thuật”. Nhà xuất bản Khoa học và Kỹ thuật, 2011.

Liao, Normand,B, “Influence of coating microstructure on the abrasive wear resistance of WC/Co cermet coatings”, Surf. Coat. Technol, vol. 2000, pp. 235-242.

Wood,“Tribology of Thermal Sprayed WC–Co Coatings”, Int. J. Refract. Met. Hard Mater, vol. 28(1), pp. 82–94, 2010.

How to Cite
Nguyen Thanh Phu, Dinh Van Chien, Dao Duy Trung, Le Van Thoai, & Doan Thanh Hoa. (2019). MULTI-RESPONSES OPTIMIZATION FOR QUALITY OF WC-12Co COATING BASED ON MRWSN METHOD. UTEHY Journal of Science and Technology, 20, 16-22. Retrieved from