Dwysedd Powdwr Graffit

(Dwysedd Powdwr Graffit)

Mae dwysedd powdr graffit yn bwysig i weithgynhyrchwyr batri wybod oherwydd ei fod yn effeithio ar brosesu a thrin deunyddiau. Mae'n arbennig o bwysig ar gyfer cydlyniad powdrau, which can cause aggregates in the final slurry and result in defective anodes.

Several methods are available to measure the true density of a bulk sample of a porous material, such as helium or mercury, to exclude voids and spaces between the particles. Yn dibynnu ar y cais, the density may also be measured in a vacuum to remove ambient gas.

A simple method for determining the apparent density of a powder is presented in figure 2. This method relies on a thick glass cylinder with a known weight placed between two pistons which enable the pressure gradient to be induced within the sample during compression.

The apparent density is then presented against the height h of the sample in the compression chamber. As shown in figure 2, the apparent density of graphite A (graphite B is only used as an example) increases significantly as the height h is increased, due to the pressure gradient in the compressed sample.

The treatment according to the invention consists of mechanically abrading the irregularly shaped graphite particles with a suitable energy dose until their Scott density and/or tamped density have increased to a considerable extent. The effect is primarily due to the abrasion, but also includes a change in the other properties, megis maint y gronynnau.

(Dwysedd Powdwr Graffit)