Friction and wear is an important service behavior of cemented carbide, the performance is to determine the key indicators of hard alloy applications. Usually friction and wear can be divided into two categories, the first category is the result of the mechanical action between the friction pair; The second is due to chemical reaction between the friction pair, such as oxidation, friction caused by chemical reaction.
Mechanical wear and can be divided into, adhesion, corrosion, erosion and surface fatigue wear, etc. Cemented carbide in the process of application is mainly the corrosion damage form, also known as abrasive wear. Reduce the grain size in general can help improve the wear resistance of cemented carbide. For example, the ultra-fine grain cemented carbide wear resistant performance is twice as common cemented carbide. But, depending on the friction and wear mechanism of the specific need friction for coupling the organizational structure of the carbide itself.
(Tungsten Carbide Pins Carbide Pins Carbide Tire Studs - Six Star Hardmetal)
In the diamond as a dual, plastic deformation and surface fracture is the main role; In ZrO2, SiC, SiO2 soft materials such as dual, WC grain dislodgement (tungsten carbide) and Co (cobalt) phase of wear is the main mechanism. Coarse grain in wear usually show a more brittle, and fine grained materials exhibit more plastic. However, in using fine grinding, such as 1 ~ 10 microns diamond, Al2O3, and SiC, the wear resistance of cemented carbide is decreased as the size of WC grain size reduced. The phenomenon may be related to wear of WC grain uproot, tungsten carbide WC grain size, the greater the contact area with Co, the more the greater the depth, the greater the pull out of the difficulty, and therefore the more wear-resisting.
没有评论:
发表评论