Basic knowledge for Abrasive Industry

This article is a simple manual for abrasives industry. It contains notes about the basic terminology of abrasives and some of the experience for reference.

Chemical Analyses

The chemical composition plays a decisive role in the physical properities of abrasives.Even small changes in chemical composition can make a big difference in their properities, so there are strict regulations on the chemical composition of various abrasives.The follow chemical symbol frequently be referenced in abrasive industry .

Physical Properties:

Hardness: Under high temperature,there are some deformations at the tip of the abrasivegrain-plastic deformation. Hardness is the resistant ability of abrasive grains when a compressiveforce is applied. Chemica composition and shape of abrasive particles are the main factors affecting the hardness

Toughness Resistant ability to fracture when grinding. Different abrasive and different chemical component with different crumbliness.

Particle Density: Without open pores, the content of abrasive grain in a unit volume. It is animportant index reflecting crystallinity and purity of abrasive grains.

Bulk Density:The mass of abrasive grains in a unit volume in the case of natural accumulation. The unit is g/cm3 It has great influence on the forming strength and grinding performance.

Hydrophilicity: The property of abrasive grains to be wetted by water,also known as capillaryphenomenon. It affects the combination of abrasive grains and bond.

Cleanliness:Amount of fine dust on abrasive grains. Abrasive grains with unqualified cleanliness put into production will reduce bonding strength of abrasive grains and bonding agent.

Magnetic: General term of magnetizer in abrasive grains. It is mainly due to abrasive grains aremixed with iron mixture in smelting. For abrasives, iron is harmful. In abrasive standard , there arestrict provisions on the content of magnetic materials.

Particle size: The size of abrasive grains.Used for bonded abrasives,particle size starts withF, including 37 sizes. Used for coated abrasives, particle size starts with P, including 28 sizes

Shape: The shape is one of important properties of abrasive grains, which affects the particlestrength and bulk density. It has three shapes: Cubic (Barmac), Angular (Ball Milled) and Sharp（Pair Rolled) .