Improvement of the Performance of Diamond Segments for Rock Sawing, Part 2: Factors Influencing the Use of Coated Diamonds

摘要

This is the second in a series of three papers concerned with the improvement of the performance of diamond-impregnated segments for the circular sawing of natural rock materials. In Part 1, the influences of segment components on the performance of segments were studied through relating segment working state with its sawing performance. This second part is devoted to study the mechanisms for the retention of coated diamond grits and the influence of diamond strength disparity. Scanning Electron Microscope and Energy Dispersive Spectrometers were employed to analyze the bonding of diamonds to an iron-based matrix at two situations where un-coated and Ti-Cr coated diamonds were used respectively. Strong metallurgical bonding was observed between the coated diamond and the metal matrix and subsequently the retention ability was increased. However, the retention effect of coating was greatly offset by the disparity of diamond strength.