In recent years,new research has been focused on fine grained, ultra fine grained, even nanocrystalline tungsten carbide and gradient tungsten carbide. The gradient tungsten carbide has the gradient of the composition and the gradient of the structure. In addition, it can also be used to produce the gradient tungsten carbide, such as the gradient tungsten carbide anvil.

Fine grain and ultra-fine grain tungsten carbide has also come to market, such as the fine grain YGS drawing die in drawing LMM steel wire, is 3 times the general drawing die.

Density is an important quality index of tungsten carbide. Under certain conditions, the density reflects the structure of the alloy. When the porosity is larger or the free carbon exists, the density is low. ETA phase occurred in the alloy, high density.

Density is usually used in the tungsten carbide industry to determine the accuracy of a brand. Unlike conventional understanding, the porosity of modern tungsten carbides cannot be determined by density measurements. The density of tungsten carbide (WC) is 15.7 g/cm3, and the density of cobalt is about g/cm3. So for the WC-Co brand, with increasing cobalt content, the density decreases linearly, increase of titanium carbide leads to lower density because of pure titanium carbide tungsten carbide density is only 4.9 (WCWC, also abbreviated TC) density is 15.7 g/cm3, the density of cobalt is 4.9 g/cm3.

tungsten carbide density has a great relationship with the material composition, porosity and carbon content, and the density of tungsten carbide is extremely sensitive to the composition and the porosity of the alloy under the condition of certain composition.

Firstly,What is the relationship between density and material composition? Density is closely related to the content of material composition. For example, the density of tungsten cobalt alloy decreases with the increase of cobalt content.

Secondly,what is the relationship between density and porosity?There is a close relationship between density and pore size. The existence of pores and the size of pores directly affect tungsten carbide density. Because of the existence of pores, the actual density is less than the theoretical density. tungsten carbide in the process of compaction and sintering in the carburizing, burning, dirty, bubbling, peeling, not good pressure, etc., will result in reduced density.

Thirdly, what is the relationship between density and carbon content? In the case of a constant composition, porosity, and free carbon density ETA hard alloy and tungsten carbide has a direct relationship. In a WC+ + ETA three-phase zone, with the amount of carbon reduction, phase Co and phase increase, decrease, increase of W content, the density increases. In a WC+ + ETA three-phase region, with the increase of carbon content (free carbon is called the "C" class, pore density reduction). In a phase WC+ area, with the amount of carbon reduction, a phase of the increase of W content, the density increases. In general, the carbon content of normal tissue increased from 0.1 to 0.13%, and its density decreased by 0.1g/cm3. The density of tungsten carbide (WC, also abbreviated to TC) is 15.7g/cm3, and the density of cobalt is 8.9g/cm3.

Hide Comments | Add Comment