Diamond tool and method of producing the same

A method of making a diamond tool having a shank portion and a diamond chip bonded thereto, comprising:

• providing a diamond chip;
• mixing diamond granules and a carbon source material to form an ingredient layer of material containing said mixture;
• placing a portion of said ingredient layer in contacting relationship with said diamond chip;
• placing a metallic silicon powder over a surface of said ingredient layer;
• and
• heating said ingredient layer to melt said metallic silicon powder and permeate molten silicon in said ingredient layer, react said molten silicon with said carbon source material to form silicon carbide, and form a shank portion bonded to said diamond chip;
• so that a reaction-sintered silicon carbide material is formed in said shank portion having a thermal expansion coefficient, at least in the portion of said shank portion in contact with said diamond chip, close to the thermal expansion coefficient of said diamond chip.