Wear Resistance of Bronze-Matrix Samples of Diamond Tubular Drills with Ultrafine Diamond and Molybdenum Powder Reinforcement

• Published in: Powder metallurgy and metal ceramics 2020, Vol.58 (9-10), p.608-612
• Main Authors: Umansky, V.P., Brodnikovsky, N.P., Bashchenko, O.A., Kulakov, A.S.
• Format: Article
• Language: English
• Subjects: Abrasive wear; Abrasive wheels; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Diamond drills; Diamond tools; Glass; Hardness; Materials Science; Mechanical properties; Metallic Materials; Molybdenum; Natural Materials; Porosity; Powder Metallurgy Industry and Managerial Economics; Powders; Silicon compounds; Tin; Tin bronzes; Ultrafines; Wear rate; Wear resistance
• ISSN: 1068-1302; 1573-9066
• DOI: 10.1007/s11106-020-00114-z

The paper examines the abrasive wear rate of samples produced by vacuum impregnation of ultrafine diamond (ASM 1/0) and molybdenum powders with tin bronze. The tests were performed using a SiC-based abrasive wheel in the presence of cooling water. The introduction of and increase in the ultrafine diamond powder in the samples substantially decrease their wear rate (by a factor of 78). The hardness of the samples first increases when diamond powder content rises to 5 wt.% and then decreases when ASM 1/0 content further rises to 11 wt.% because of small porosity that appears in the samples. The use of a bronze matrix containing more than 15 wt.% Sn does not decrease the wear rate of the test samples and, hence, of the associated diamond tools, in spite of increase in their hardness.