Abstract
The abrasive wear is a very extended type of wear, which in 80-90 % causes all possible damages of machine elements operation parts. WC-NiMoCrFeCo coating was investigated as an advantageous material for wear protection and its abrasion wear resistance was tested. The tribological tests were performed in “low-stress conditions” using Dry Sand Rubber/Wheel Test in accordance with the ASTM G-65 Standard. Alumina and silica abrasive sands were chosen in three different size distributions: Al₂O₃ in grain size 75-90 µm, 212-250 µm, 600-700 µm and SiO₂ in grain size 60-90 µm, 200-300 µm, 600-700 µm. The wear tracks of WC-Hastelloy coating were examined using scanning electron microscope. WC-NiMoCrFeCo was found as a good alternative to the commonly used carbide coating. To evaluate an abrasive ability and efficiency of all abrasive mediums, the wear test of soft carbon steel and of WC-Hastelloy coating was performed by periodical using of abrasive particles.

Key words
WC-Hastelloy, abrasive wear, Al₂O₃ sand, SiO₂ sand, grain size, abrasive efficiency

Full text (850 KB)