tungsten carbide is also called tungsten carbide-cobalt cemented carbide. According to the content of cobalt, it can be divided into three categories: high cobalt, medium cobalt and low cobalt. tungsten carbides are usually manufactured in accordance with special ceramic ingredients and molding processes, which are generally carried out in carbon tube electric furnaces, hydrogen molybdenum wire electric furnaces and high-frequency vacuum furnaces. This article is about the magnetic saturation and coercivity of tungsten carbides.
Magnetic saturation
In the impact field of the tungsten carbide sample, with the increase of the external magnetic field, the magnetic induction intensity of the tungsten carbide also increases. When the magnetic field intensity reaches a certain value, the magnetic induction intensity no longer increases, that is, the tungsten carbide has reached magnetic saturation. The magnetic saturation value of tungsten carbide is only related to its cobalt content, and has nothing to do with the grain size of the tungsten carbide phase in the tungsten carbide. Therefore, magnetic saturation can be used for non-destructive composition inspection of tungsten carbides, or to identify the presence of non-magnetic ηl phases in alloys of known composition.
Coercive force
The coercive force of tungsten carbides Because the binder phase in the cemented carbide is a ferromagnetic substance, the tungsten carbide has a certain degree of magnetism. The coercive force can be used to control the structure of tungsten carbides. It is produced by cemented carbide manufacturers. An internal control finger. The coercivity of tungsten carbide is mainly related to the content of cobalt and its dispersion, and it increases with the decrease of cobalt content. When the amount of cobalt is constant, since the degree of dispersion of the cobalt phase increases as the tungsten carbide grains become finer, the coercive force also increases. On the contrary, the coercivity decreases.
Therefore, under the same other conditions, the coercivity can be used as an indirect parameter to measure the size of the tungsten carbide grains in the alloy. In an alloy with a normal structure, as the carbon content decreases, the tungsten content in the drill phase increases. The cobalt phase is greatly strengthened, and the coercive force will increase accordingly. Therefore, the greater the cooling rate during sintering, the greater the coercive force.
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