Graphite Hot Pressed Molds: Key Tools for Manufacturing High Strength Materials

  • Good electrical & thermal conductivity.
  • High temperature resistance, low coefficient of thermal expansion.
  • Corrosion resistance, high oxidization resistance.
  • Excellent machinablity.
Hot pressed molds are arranged in 3 rows.

Hot pressing is a process that simultaneously perform pressing and sintering on metal , plastic or other materials. Hot pressed molds are molds used in the hot pressing process. Made of graphite materials, hot pressed molds have good high temperature stability and high hardness, and can pressurize the prepared material while heating the material as a heating unit.

Generally, the heating methods used are broadly divided into two types: resistance heating and induction heating. In addition, there are other processes such as vacuum hot pressing, vibration hot pressing, equalizing hot pressing, and isostatic pressing.

Hot pressed molds have high stability, good electrical conductivity and lubricity, high thermal conductivity and heat resistance, corrosion resistance, high mechanical strength and easy processing, good plasticity, and are widely used in non-ferrous metal smelting, electronics, semiconductors, and other industries. In addition, we can also provide you with hot pressed molds for the production of boron carbide materials.

  • Hot pressed products have high density and good performance. Pressing and heating are carried out in the same procedure, and a dense sintered body can be obtained after a short time of sintering. The products have low extremely low porosity, and its density almost reaches the theoretical value. So these products have higher hardness and better wear resistance, which greatly reduce the cost.
  • It required low pressing pressure and can produce large products. When the pressing temperature reaches 1350–1450 °C, the required pressure per unit is reduced to 67–100 kgf/cm2 (1/10 of the cold pressure).
  • It can produce products with complex shapes. During hot pressing process, the powder is in a thermoplastic state with low deformation resistance, and it is easy to plastic flow and densification, so it can produce products with complex shapes.
Table 1: Specifications of Hot Pressed Molds
Model Density (g/cm3) Particle Size (μm) Specific Resistance (μΩ.m) Porosity Shore Hardness Compressive Strength (MPa) Flexural Strength (MPa) CTE (× 10-6 °C-1) Application
IS-3 (Isostatic) 1.85 10 12 13% 48 85 46 4.3 Sintering / All kinds of machining
IS-4 (Isostatic) 1.90 5 12 13% 48 85 46 4.3 Sintering / All kinds of machining
MD-1 (Molded) 1.78 25 12 20% 48 80 40 5 Sintering / All kinds of machining
  • 1 MPa = 10.2 kgf/cm2; 1 W/m.k = 0.86 kcal/cm.h.°C
  • These properties are typical values and not guaranteed.