Commonly used metal powders for diamond tools and their characteristics

Depending on the use, variety, and production process of diamond tools, different powders are required, such as metals, nonmetals, alloys, compounds, etc. Let’s introduce in detail the metal powders and characteristics commonly used in diamond tools:

1. Copper powder: Electrolytic copper powder has good formability and is widely used for sintering after cold pressing.

2. Iron powder: There are reduced iron powder, electrolytic iron powder and carbonyl iron powder. The advantages of iron powder as a binder material are: low price, good wettability with diamond, and good compatibility with skeleton materials.

3. Cobalt powder: irregular sponge-like, binder material. Its advantages are: good formability and sintering properties; improved flexural strength of the matrix; strong bonding with diamond and good wettability.

4. Tin powder: The particles are drop-shaped, gray-white powder, easy to oxidize, and turn yellow after oxidation. Produced by atomization method. Its function is to improve the sinterability of the carcass (lower the melting point); it is easy to form intermetallic compounds, which can improve wear performance and deformation ability.

5. Tungsten carbide: black, no mechanical inclusions, porous sponge-like, produced by reduction method. Tungsten and tungsten carbide are mainly added to the carcass as skeleton materials to improve the wear resistance of the carcass. If the content is too high, it will easily increase the brittleness of the carcass.