Industry News

- February 09, 2023

What are the advantages of graphite mold?

The graphite mold materials used for diamond tool manufacturing are mainly ultrafine particle structure, high purity, high degree of graphitization graphite materials. The average diameter of the graphite mold material is less than 15 microns, even less than 10 microns, and the average aperture is less than 2 microns. The graphite mold made of carbon raw material has the advantages of small porosity, compact structure, high surface finish and strong oxidation resistance, and its average service life can reach 30 ~ 40 times.

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

The electronic sintered graphite die of hot pressing sintered diamond tool has dual functions of heating element and mold support in the manufacturing process of diamond tool. The quality of the graphite die directly depends on the dimensional accuracy and appearance of the diamond tool.

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

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

Diamond mold has high hardness, good oxidation resistance and high processing precision. The use of high quality graphite material greatly prolongs the service life of the mold and improves the oxidation resistance of the mold.