Abrasive

In the grinding process from the cutting action in hard material in general, mainly for the manufacture of abrasive. Abrasive is sharp, hard material, for grinding the

surface of softer material. There are natural and artificial abrasives abrasives abrasives two categories. Classification according to the hardness superhard abrasive

and general

Through extravagant abrasive two categories. A wide range of abrasive, from softer household detergents, precious hard abrasive material into the diamond. Each is a

precision abrasive product manufacturing essential materials. Many natural abrasives, has been replaced by artificial abrasives. In addition to the diamond outside

Natural abrasive properties are not very stable, but still has its value in use.
Abrasive - summary
Abrasive is sharp, hard material, for grinding the surface of softer material. There are natural and artificial abrasives abrasives abrasives two categories.

Classification according to the hardness and the general extravagant super abrasive abrasive two categories. A wide range of abrasive, from softer household

detergents, abrasives to gem

Diamond the hardest material. Each is a precision abrasive product manufacturing essential materials. Many natural abrasives, has been replaced by artificial

abrasives. In addition to diamonds, the natural abrasive properties are not very stable, but still has its value in use. Hardness Diamond is the most

High abrasive, origin in South Africa, accounting for 95% of world production, and the rest of Brazil, Australia, Guyana and Venezuela and other places. Industrial

diamonds ranging from white to black, crushed can be prepared by grinding wheel, abrasive, polishing and grinding powder.

Abrasives - Body
The grinding, lapping and polishing in the particulate material from the cutting action. Mainly for the manufacture of abrasive grinding tools, can be directly used in

certain grinding and polishing work.
Abrasive grinding should have the following basic properties: ① high hardness, should generally be higher than the material to be processed; ② appropriate strength, but also

a sharp cutting edge in the grain can withstand cutting forces without fragmentation, when cut to a certain grinding obtuse degree of partial fragmentation when

exposed new sharp edge;

③ high temperature stability, in the grinding temperature can maintain its inherent hardness and strength; ④ chemical inertness, and being easy to produce a chemical

reaction processing of materials. These properties and the chemical composition of the abrasive, mineral composition, crystal morphology and integrity of the crystal

and so on.
The thickness of the abrasive particles in said particle. Graded by sieving particles, the particle size is usually sieved through the sieve of the finest mesh

representation. If appropriate side through a 20-per-inch mesh screen and pass under the adjacent sieve One, known as the 20th granularity. Grain

Graduation is larger, finer particles. The abrasive particle size less than 63 microns is called powder, generally based on water or air classification sedimentation

method. Abrasive grains are usually composed of many of the "swarm" of products, each level of granularity to which the swarm particle size range of basic

That if the size number 28/20 powder, referring to the primary particle size of 28 to 20 microns. Thickness of the abrasive particle size, the surface quality of the

workpiece by grinding and processing efficiency are greatly affected. When the workpiece machining allowance, demanding to improve processing efficiency without

requiring high table

Surface quality, the choice of coarse granularity; contrary, should be used in relatively fine-grained.
A brief history of early Paleolithic people began using sand grinding bone tools. China in the 16th century BC on the use of natural abrasives polished bronze and

jade. In 1891, the United States EG Acheson made out of silicon carbide in an electric furnace, created the first artificial abrasives.

In 1897, the successful development of artificial corundum. In 1934, the advent of boron carbide abrasive. Before and after the 1950s, monocrystalline corundum,

microcrystalline corundum, chromium corundum and zirconium corundum and other products have appeared in the U.S.. Especially synthetic diamond and cubic boron nitride

manufacturing success, marking the mill

Material development has reached a new stage. The emergence of artificial abrasives, grinding technology to promote the development, but also expanded the scope of

application of the abrasive.
Kind commonly used abrasives are mostly hard non-metallic materials, there are natural and man-made two categories. (See pictures)
Abrasive
Natural abrasives ore through direct use of natural selection, crushing, grading, or other abrasive made after processing. There are natural emery, natural corundum,

natural garnet and diamond and so on. Table 1 describes the characteristics of this type of abrasive and main uses. Due to natural abrasives

Resources affected by natural conditions, it is difficult to artificially control, so compared with artificial abrasives has been relegated to a secondary position.
Abrasive
 
Abrasive
Artificial abrasive artificially refining or synthetic abrasives. Wider application of corundum, silicon carbide, boron carbide, synthetic diamond and cubic boron

nitride. Table 2 lists their main purpose. Diamond and cubic boron nitride is often called the super abrasive or hard

Material, and corundum, silicon carbide, then it is called ordinary abrasive. Additionally, in some grinding and polishing, as well as with the so-called "soft

abrasives," such as chromium oxide, iron oxide and cerium oxide. Artificial corundum and silicon carbide abrasive due to wear, corrosion, or in the optical,

electrical, thermal, etc.

Have different characteristics, in addition to used as an abrasive, there are many other uses, such as for advanced refractory, electric materials, high temperature

semiconductor materials and engineering structural materials.