Graphite mold for diamond tools

The graphite mold materials used in the manufacture of diamond tools are mainly ultra-fine particle structures, high purity, and high degree of graphitization. The average diameter of the graphite mold material is less than 15 microns, or even less than 10 microns, and the average pore diameter is less than 2 microns. The graphite mold made of the carbon raw material has the advantages of small porosity, dense structure, high surface smoothness, and strong anti-oxidation ability.

Electronic sintered graphite molds and transistor holders can be manufactured from artificial graphite materials with minimal thermal distortion. At present, they are widely used and have become indispensable materials for the development of the semiconductor industry.

Electronic sintered graphite molds for hot-pressed sintered diamond tools have the dual functions of heating elements and mold support during the manufacture of diamond tools. The quality of graphite molds directly determines the dimensional accuracy and appearance of diamond tools.

In addition, graphite molds are also used in cast iron, durable molds for various non-ferrous metals, steel castings, heat-resistant metals (titanium, zirconium, molybdenum, etc.) and rail welding aluminum heat-welding molds.

Hot press sintering process requirements: The temperature is (1000 ± 2) °C, the forming pressure is 16 × 50 MPa, the holding time is 15 × 30 min, and the environment is non-vacuum. Under such working conditions, not only conductivity, high resistivity and sufficient mechanical strength are required, but also good oxidation resistance and long service life are required to ensure the dimensional accuracy and excellent performance of diamond tools.

Diamond graphite mold has high hardness, good oxidation resistance and high processing accuracy. The use of high-quality graphite raw materials greatly extends the service life of the mold and improves the oxidation resistance of the mold.