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Graphite Sintering Molds in Cemented Carbide Sintering
Created on 09.17
Graphite sintering molds play a pivotal role in the cemented carbide sintering process, ensuring precision and material integrity. The core workflow begins with mold pre-treatment: graphite molds are cleaned to remove impurities and preheated to 800-1000°C to eliminate moisture and volatile components. Next, cemented carbide powder (typically tungsten carbide-cobalt mixtures) is filled into the mold cavities via automated pressing, achieving a green density of 50-65%. The mold-assembly is then transferred to a vacuum sintering furnace, where it undergoes a 3-5 hour cycle: heating to 1350-1500°C at a rate of 5-10°C/min, isothermal holding for 60-90 minutes to facilitate grain growth and densification, and controlled cooling to prevent thermal cracking.
These molds offer distinct advantages: high thermal conductivity (150-200 W/m·K) ensures uniform heating, excellent chemical inertness avoids reactions with carbide alloys, and good machinability allows for complex cavity designs. Classified by structure, they include integral molds (for simple shapes like rods), split molds (for intricate parts with undercuts), and insert molds (for modular production of multi-component carbides). Their durability—with a service life of 500-1000 cycles—makes them cost-effective for high-volume cemented carbide manufacturing.
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