What is corundum? What is the use of corundum?

June 06, 2022

Flap Disc

BRIEF INTRODUCTION

Henan Yuteng Grinding Material Co., Ltd. is located in Kaifeng City, Henan Province. Is a set of production, research and development, service as one of the grinding agent, grinding, polishing products professional company, specializing in the production and sales of coated grinding tools derived ancillary products: flocking sand disc, blade, all kinds of special-shaped grinding disc, sponge grinding block, steel paper disk, ring sand belt, sand ring and automotive polishing products.

Our main products are Velcro Disc,Abrasive Paper,Fiber Disc,Flap Disc,Abrasive Cloth,Abrasive Belt.

Relying on the advantages of the industrial base, the company has advanced production equipment and strong technical force, complete testing equipment to ensure that the products are sharp, wear-resistant and high strength, and the product quality reaches the advanced level of similar international products.

Our products can be used for all kinds of metal watches and stainless steel, alloy steel, non-alloy steel, non-ferrous metals, titanium alloy and other grinding and wire drawing, polishing and so on; Wood, high-medium fiberboard, flower board, composite board, glass, rubber and other table grinding and polishing. Widely used in automobile, steel, building materials, shipping, aviation, wood, plastic, leather and other industries.

We provide customers with the best surface treatment program, according to the actual needs of customers "tailored" a variety of specifications of sand pan, sand belt, sand carbon and emery cloth ring polishing products.

The company's flexible operating mechanism and all customer-centric concept, we in addition to provide you standardized, serialized products, but also according to your special requirements, for you to manufacture high-quality, personalized non-standard coated with abrasive products.

Corundum overview:

Corundum, whose name originates from India, is a mineralogical name. There are three main variants of the homogeneous anomaly of corundum Al2O3, which are α- Al2O3、 β- Al2O3、 γ- Al2O3。 In gemology, those with gem conditions are called Ruby and sapphire. Myanmar, Sri Lanka, Thailand, Vietnam and Cambodia are the most important suppliers of high-quality Ruby and sapphire in the world. Other producing countries include China, Australia, the United States, Tanzania, etc. The hardness of corundum is second only to diamond.

Main uses of corundum:

Corundum has been widely used in metallurgy, machinery, chemical industry, electronics, aviation, national defense and many other industrial fields because of its excellent high-temperature properties and mechanical strength. Its main uses are as follows.

1. Due to its high temperature resistance, corrosion resistance, high strength and other properties, it is used as a crucible and vessel for pouring steel sliding nozzle, smelting rare and precious metals, special alloys, high-purity metals, glass drawing, and making laser glass; Various high-temperature furnaces, such as refractory, ceramics, lining (walls and tubes) of iron making blast furnaces; Physical and chemical utensils, spark plugs, heat-resistant and anti-oxidation coatings. Low silicon sintered corundum brick with SiO2 less than 0.5% is a special lining for carbon black, boron chemical industry, chemical fertilizer, synthetic ammonia reaction furnace and vaporization furnace.

2. Due to its high hardness, good wear resistance and high strength, it is used as a component of various reaction vessels, pipelines and chemical pumps in chemical systems; For mechanical parts, various molds, such as wire drawing die, pencil lead extrusion die nozzle, etc; It is used as cutting tool, abrasive, bulletproof material, human joint, sealing grinding ring, etc.

3. Due to its high-temperature insulation, it is used as the threading tube and protective tube of thermocouple. The insulation used in atomic reactor is still excellent. In addition, the loss is small, and the dielectric constant is small. It is widely used in the electronic industry for solid integrated electric furnace base plate tube holder, shell, ceramic frame, thin window, missile radar antenna protective cover, etc.

4. Al2O3 is an ionic crystal with stable structure. When used under high frequency, high voltage and high temperature, its insulation is still excellent. In addition, its loss and dielectric constant are not large. It is widely used in the electronic industry for solid extruded circuit substrate tube base, shell, porcelain frame, micro glass window, missile radar antenna protective cover, etc.

5. Corundum products have good air tightness and are airtight even at high temperature. Therefore, they are widely used in electric vacuum, such as making various large electronic tube shells and double in-line packaging shells in solid microcircuits with corundum.

6. Corundum thermal insulation materials, such as corundum light bricks, corundum hollow balls and fiber products, are widely used in furnace walls and roofs of various high-temperature furnaces, which are both high-temperature resistant and thermal insulation.

7. Transparent corundum products can be used to make lamp tubes and microwave fairing. In addition, na-b-al2o3 products are electrolyte materials for manufacturing sodium sulfur batteries.

Special purpose

Corundum, as a kind of abrasive, is widely used in abrasive tools. There are many kinds of corundum, and different kinds of corundum are used for different purposes. This column will introduce you to the types, characteristics and specific uses of corundum.

1. brown corundum

The appearance of brown corundum is brown, and the content is 94.5%--97%. It has the characteristics of high hardness, high toughness, sharp particles and relatively low price. It is suitable for grinding metals with high tensile strength. In the absence of other abrasives, it can generally be replaced by it.

It is widely used for rough grinding of common steel, such as carbon steel, general alloy steel, malleable cast iron, hard bronze, etc. The secondary abrasive of brown corundum is often used as rice grinding wheel and resin cutting wheel. Sand tile, sand cloth, sand paper, etc.

2. white corundum

The hardness of white corundum is slightly higher than that of brown corundum, but the toughness is slightly poor. It is easy to cut into the workpiece during grinding. It has good self sharpening property, small heat generation, strong grinding ability, high efficiency and higher price than brown corundum.

Suitable for grinding high hardness steel, such as high speed steel, high carbon steel, quenched steel, alloy steel, etc.

3. black corundum

Black corundum is a derivative of brown corundum, and its appearance is black. Low hardness but good toughness.

It is mainly used for free grinding, such as grinding or rough grinding before electroplating, and also for making coated abrasive tools, resin cutting pieces, polishing blocks, etc.

4. single crystal corundum

The grain of single crystal corundum abrasive is composed of single crystal, and has good multi edge cutting edge, high hardness and toughness, strong grinding ability, and less grinding heat. The disadvantage is that the production cost is high, waste gas and waste water are generated in production, and the output is low.

It can be used for grinding hard and tough metal materials, such as stainless steel, high vanadium high-speed steel, heat-resistant alloy steel and workpieces that are easy to deform and burn. Considering that single crystal corundum abrasive is limited by production conditions, it is generally recommended to be used for grinding heat-resistant alloy and hard to wear metal materials.

5. microcrystalline corundum

Microcrystalline corundum is a derivative of brown corundum. Its appearance, color and chemical composition are similar to those of brown corundum. It is characterized by small crystal size (50-280 μ m) , with good toughness, high strength and self sharpening.

It is suitable for grinding stainless steel, carbon steel, ball milled cast iron, etc. in terms of grinding methods, it is suitable for forming grinding, cut in grinding, fine grinding and heavy load grinding.

6. zirconium corundum

It is characterized by low hardness, high toughness, high strength, fine crystal size and good wear resistance.

Zirconium corundum abrasives abroad are mainly used for heavy load grinding, suitable for grinding heat-resistant alloy steel, titanium alloy and austenitic stainless steel.

7. chrome corundum

Chrome corundum is a derivative of white corundum, with rose appearance, similar hardness to white corundum, slightly higher toughness than white corundum, high strength, good grinding performance and high grinding precision. The abrasive tool made of this abrasive has good shape retention.

The scope of application is similar to that of white corundum, especially suitable for fine grinding and forming grinding of various cutting tools, measuring tools and instrument parts. Generally, chrome corundum has better grinding performance than white corundum.

8. sintered corundum

Sintered corundum is sintered from fine bauxite or alumina powder. It is characterized by good toughness and can be made into abrasive particles of various special shapes and sizes.

It is mainly used for heavily loaded steel ingot grinding wheel, and is suitable for raw grinding of stainless steel ingots.

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