Cemented carbide (Tungsten Carbide/Cemented Carbide) is based on one or more refractory metal carbide powders (such as tungsten carbide, titanium carbide, tantalum carbide particles, niobium carbide, etc.), with cobalt, nickel and other metal powders as the base. Binder, an alloy material produced by the powder metallurgy process, has excellent thermal, mechanical, magnetic, and chemical properties, mainly used to make cutting tools, rock drilling tools, mining tools, drilling tools, measuring tools, resistance Grinding parts, and other products.
Carbide tool
As one of the important factors in the quality control of cemented carbide, coercive force, also known as a coercive force, can reflect the size and distribution of alloy grains. The magnitude by which the remanence is zero, expressed in HCJ, in A/m or kA/m. Its value mainly depends on the irreversible displacement of the magnetic domain wall and the irreversible rotation of the magnetic domain.
Hysteresis loop
Formation mechanism of the coercive force of tungsten-cobalt cemented carbide: If the influence of lattice defects and internal elastic stress is ignored, the irreversible displacement of the magnetic domain wall and the irreversible rotation of magnetic distortion are mainly affected by the tungsten carbide/metal cobalt interface. Therefore, for a certain grade of tungsten-cobalt-based cemented carbide, when the cobalt content is constant, as the particle size of tungsten carbide decreases, the thickness of the cobalt phase also decreases, that is, the magnetic domain of the ferromagnetic material in the alloy decreases, and the total carbon domain decreases. When the number increases, the contact area between the carbon domains and the tungsten carbide increases, and its hindering effect on the irreversible displacement of the magnetic domain wall and the irreversible rotation of the magnetic domain increases, that is, the coercive force of the alloy increases.
Generally speaking, when the cobalt content and other factors are the same, the coercive force of cemented carbide increases with the decrease of the particle size of cemented carbide such as tungsten carbide. After reaching a maximum value, it increases with the grain size. decrease and decrease. The coercive force of cemented carbide decreases with the increase of cobalt content when the particle size of cemented carbide such as tungsten carbide and other factors are constant. When the temperature rises to overfire, the tungsten carbide grains will grow, resulting in a decrease in the coercivity of the alloy.
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