Cemented Carbide with Iron and Nickel As Binder

Cemented carbide is known as industrial teeth. Its main component is tungsten carbide (WC). Because cobalt powder has good wettability to tungsten, cobalt is generally used as bonding phase. The conventional proportion is 2-10%. Over the past year, the price of cobalt has been rising, which has seriously affected the production cost of cemented carbides. Experts and scholars around the world are studying new resources of new cemented carbide materials. Tesla is trying to replace cobalt with iron and nickel as new materials for batteries. In the cemented carbide industry, some enterprises use iron and nickel instead of cobalt.

Ferro-nickel deposits are abundant and cheap. Some scholars put forward a special excellent performance of low-cost cemented carbide materials, which can ensure the compaction forming performance of cemented carbide. At the same time, when sintering cemented carbide mixtures, argon is used as carrier gas to dewax and recover paraffin, which greatly improves the quality of products. The production process of cemented carbide with iron-nickel binder includes the following steps:

Step 1: Mixed grinding of raw materials: WC, Fe-Ni composite powder, Co powder and chromium carbide are mixed in a wet grinder with a weight ratio of 60-80::10-20:1:0.35-0.7, and grinding rods are added for grinding.

Step 2: Addition of grinding medium and forming agent: The forming agent is paraffin, specifically refining paraffin at 58 C. After heating and melting, it is added to the wet mill 24 hours before the end of wet grinding or 5 hours after the start of wet grinding.

Step 3: Filtration, screening and drying: The wet abrasive slurry after step 2 is filtered, screened and dried.

Step 4: Compression forming: the material particles through screen scrubbing are compacted and formed to obtain semi-finished products;

Step 5: Sintering: The pressed semi-finished products are sintered in the sintering furnace, and then the finished products are obtained after cooling.

The method mentioned above can ensure the properties of compaction forming of cemented carbide and the special excellent properties of low-cost cemented carbide materials. At the same time, when sintering cemented carbide mixture, argon is used as carrier gas to dewax and recover paraffin, which greatly improves the quality of products, reduces pollution and reduces the potential safety hazards.

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