Manufacturing process of cemented carbide

The main raw materials used in cemented carbide production include tungsten trioxide, tungsten powder, titanium dioxide, tantalum (niobium) powder or tantalum (niobium) pentoxide, cobalt oxide (or cobalt powder), carbon black, etc. During the production process, raw materials such as tungsten carbide, titanium carbide, tantalum carbide, niobium carbide, and metallic cobalt powder are typically required.  

Production Process Flow:  

Raw material mixing → Carburization → Ball milling → Wet milling → Filtration → Drying → Sieving → Blending → Drying → Grinding → Wire drawing → Pressing → Drying → Machining → Semi-inspection → Loading → Sintering → Sandblasting → Final inspection → Packaging

In the above process, sintering is one of the crucial steps in the production of powder metallurgy products. Its purpose is to strengthen the product to achieve the final required physical and mechanical properties. The sintering of cemented carbide is a typical liquid-phase sintering process, which can be divided into three stages:  

1. Below 1000°C.  

2. 1000°C to sintering temperature** – the most critical stage.  

3. Cooling stage.