Graphite Molds Are Widely Used in The Semiconductor Industry

Graphite mold materials used in the manufacture of diamond tools are mainly graphite materials with ultra-fine particle structure, high purity, and high degree of graphitization. The average diameter of the graphite mold material is less than 15 microns, even less than 10 microns, and the average pore diameter is less than 2 microns. The graphite mold made of this carbon raw material has the advantages of small porosity, compact structure, high surface finish, strong oxidation resistance, etc., and the average service life can reach 30-40 times. The following introduces graphite molds that are widely used in the semiconductor industry:
Electron sintered graphite molds and transistor holders can be fabricated from artificial graphite materials with minimal thermal deformation. At present, they are widely used and have become indispensable materials for the development of the semiconductor industry. The electronic sintered graphite mold of the hot-pressed sintered diamond tool has dual functions of heating element and mold support in the manufacturing process of the diamond tool, and the quality of the graphite mold directly depends on the dimensional accuracy and appearance shape of the diamond tool. In addition, graphite molds are also used for cast iron, durable molds for various non-ferrous metals, steel castings, heat-resistant metals (titanium, zirconium, molybdenum, etc.) and thermite welding molds for rail welding.
Process requirements for hot-pressed sintered graphite mold: temperature is (1000±2)°C, molding pressure is 16×50MPa, holding time is 15×30min, and the environment is non-vacuum. Under such working conditions, not only electrical 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. The diamond mold has high hardness, good oxidation resistance and high processing precision. The use of high-quality graphite raw materials greatly prolongs the service life of the mold and improves the oxidation resistance of the graphite mold.