Basic principle:

The infiltration process belongs to the liquid-phase method. Molten metals (such as copper and aluminum) are infiltrated into the pores of the green compact under pressure or capillary action, and after cooling, a dense diamond composite material blank is formed.

Key steps:

1. Green compact preparation: Obtain a fully densified green compact through cold isostatic pressing.

2. Infiltration: Place the green compact in a vacuum chamber, with metal powder placed above. Heat it to a temperature above the melting point of the metal under vacuum or a protective atmosphere, and apply a certain pressure (atmospheric pressure or mechanical pressure) to force the molten metal to infiltrate into the green compact.

3. Cooling process: After cooling, remove the mold and proceed with subsequent finishing processes.

Core advantages:

High density (>98%), high thermal conductivity (up to 550–900 W/(m·K))

High volume fraction and uniform distribution of diamond, with a low thermal expansion coefficient (6–8ppm K⁻¹)

It can achieve rapid and high-quality molding, suitable for large-sized and complex structural components.