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Investigation of Wear Behavior of Borided Materials Produced by the Powder Metallurgy Method in Different Compositions
Protection of Metals and Physical Chemistry of Surfaces  (IF1.194),  Pub Date : 2021-09-10, DOI: 10.1134/s2070205121040122
Yusuf Kayalı, Ahmet Yönetken

Abstract

Powder metallurgy (P/M) technology, which is a method of mixing, pressing and sintering stages, has many advantages (complex designs, low cost) as well as disadvantages (porosity, low surface hardness). Nowadays, surface coating methods are preferred to eliminate the disadvantage of powder metallurgy methods. In this study, samples of 96.4Fe–Mn, 89.25Fe–7.24Cr–Mn, 82.12Fe–14.39Cr–Mn, 75.08Fe–21.45Cr–Mn and 68.13Fe–28.42Cr–Mn were produced in volumetrically varying compositions. In order to increase the lifetime of ceramic-metal composites produced by the powder metallurgy method, pack boriding process was applied in 950°C for 4 h. The morphology of the boride layers formed on the surfaces of the produced samples was examined with SEM microscope. Hardness values of uncoated samples ranged from 47.5 to 240.6 HV0.05 according to their composition, and hardness values of borided samples increased from 1641 to 1950 HV0.05. Wear tests were carried out using a ball-disc wear method at a slip speed of 0.3 m/s under a load of 5 N under a load of 250 m in dry environment. Adhesion properties of the boride layer were examined by the Daimler-Benz Rockwell-C indentation test. With the boriding process, the friction coefficient has decreased and the low wear resistance has increased.