Tungsten-cobalt alloy is also called tungsten carbide-cobalt cemented carbide. According to the cobalt content, it can be divided into three categories: high cobalt (20% ~ 30%), medium cobalt (10% ~ 15%) and low cobalt (3% ~ 8%).
This cermet can be manufactured according to the usual special ceramic batching and molding process, and it is only necessary to control the sintering atmosphere to be vacuum or reducing atmosphere according to the properties of the blank and the quality of the finished product.
Generally, it is carried out in carbon tube furnace, molybdenum wire furnace with hydrogen and high frequency vacuum furnace. Domestic brands of this kind of cemented carbide are YG2, YG3, Y3x and YG4C.
Hardness:
Hardness is the main mechanical property index of cemented carbide. With the increase of cobalt content or carbide grain size, the hardness of the alloy decreases.
For example, when the cobalt content of industrial WC-Co increases from 2% to 25%, the HRA of the alloy decreases from 93 to about 86, and the hardness of the alloy decreases by 65,438 0 degrees for every 3% increase in cobalt. Refining the grain size of tungsten carbide can effectively improve the hardness of the alloy.
Compressive strength:
The compressive strength of cemented carbide is the ability to resist compressive load. The compressive strength of WC-Co alloy decreases with the increase of cobalt content in the alloy and increases with the grain refinement of tungsten carbide phase in the alloy. Therefore, the fine-grained alloy with lower cobalt content has higher compressive strength.
Refer to the above? Baidu encyclopedia-tungsten-cobalt alloy