The mass of cemented carbide per unit volume generally includes the volume of voids in the material, usually expressed in g/cm3. The theoretical density of the alloy can be calculated by the following companies:
d0=100/x/da+y/db+z/dc
Among them, da, db, and dc represent the theoretical densities of the A, B, and C components, respectively, and x, y, and z represent the mass fractions of the components A, B, and C, respectively. The formula for calculating the porosity in the alloy is:
P=(1-d/d0)×100%
Among them, P is the porosity in the alloy, % (volume fraction); d is the actual density of the alloy, and d0 is the theoretical density of the alloy.
ISO "Method for Determination of Density of Dense Sintered Metal Materials and Cemented Carbide" stipulates that when weighing a sample within 10g, the inductance of the balance should be 0.1mg, and the inductance of a sample above 10g should be 0.001% of the weight; the size of the container The selection of the liquid should be appropriate. If the sample larger than 10cm3 is put into the liquid, the rise of the liquid level is not more than 2.5mm, and the liquid is distilled water or deionized degassed water.
Density is an important product quality index of cemented carbide. Under certain conditions of composition, the density reflects the structure of the alloy. When the porosity in the alloy is large or free carbon exists, the density is low. When the η phase appears in the alloy, the density is high. The main factors affecting the porosity and density of the alloy are: insufficient wet grinding time, low density of green compacts, insufficient degassing, insufficient sintering temperature and time, mixing of impurities, etc.
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