1. Coke formed by small spheres with a porous structure like sponges and coke formed by large spheres with a dense structure like fibres or needles are of superior quality to sponge coke. In the quality index, the true density roughly represents this performance, and high true density indicates good crystallinity.
2. Consider the relative content of powdered coke and lumpy granular coke contained in the reactive coke, and the relative content of available coke.
3,The content of sulphur and ash etc. in the coke. High sulphur coke will lead to gas expansion of the product during graphitising, causing cracks in the carbon product. High ash will hinder the crystallisation of the structure and affect the usability of the carbon products.
4, the rupture resistance of the coke products when subjected to the thermal shock of sudden rise to high temperature or sharp cooling from high temperature.
You can judge the quality of metal silicon powder by the above aspects, of course, when determining the metal silicon powder, you should also consider the oil content, transparency, colour, gloss, thickness, elasticity, chemical solvents, media resistance, impact resistance, scratch resistance, abrasion resistance and so on.
