Recent Developments in Diamond Processing and Surface Modification Techniques for Tailoring Properties of Diamond Grains: A Review

The paper reviews current advancements in diamond processing and dressing techniques, highlighting the specific methods of surface modification for diamond grains to alter their properties intentionally. It discusses the scientific principles underlying the development of plastic grinding processes for brittle materials and emphasizes the relationship among specific energy, diamond tool wear, and surface roughness. Laser rough dressing effectively removes excess abrasive layers rapidly, while precision electroerosion dressing enhances profile accuracy and restores the cutting ability of the grinding wheel. The positive effects of using porous, defective diamond grains are demonstrated. The development of diamond grains with high self-sharpening properties and improved bonding within the binding material is discussed. Furthermore, the paper establishes the effectiveness of adding B₂O₃, TiO₂, and Al₂O₃ oxides to modify the surface of diamond grains, protecting against oxidation. It notes the beneficial impact of multilayer coatings containing cubic boron nitride (cBN). The addition of B₄C and V₂O₅ improves the retention of diamond grains in diamond-containing composites.