General purpose Due to its excellent high temperature properties and mechanical strength, corundum has been widely used in many industrial fields such as metallurgy, machinery, chemical, electronics, aviation and national defense. Its main uses are as follows. 1, due to high temperature, corrosion resistance, high strength and other properties, it is used as a steel sliding nozzle, smelting rare metals, special alloys, high-purity metals, glass drawing, making laser glass enamel and utensils; various high-temperature furnaces Such as refractory materials, ceramics, linings (walls and tubes) of ironmaking blast furnaces; physicochemical vessels, spark plugs, heat-resistant anti-oxidation coatings. Low-silicon sintered corundum bricks with SiO2 less than 0.5% are special furnace linings for carbon black, boron chemical, fertilizer, ammonia synthesis reactor and gasification furnace. 2, due to the characteristics of high hardness, good wear resistance and high strength, used in chemical systems, as various reaction vessels and pipes, parts of chemical pumps; as mechanical parts, various molds, such as wire drawing die, extrusion Pencil core mold mouth, etc.; for tools, abrasive abrasives, bulletproof materials, human joints, seal grinding rings, etc. 3. Because of the high temperature insulation, it is used as a ferrule tube and protection tube for thermocouples. The insulation used in the atomic reactor is still excellent, and the loss is not large, and the dielectric constant is not large. It is widely used in the electronics industry. It is used for solid integrated electric furnace substrate tube holder, outer casing, porcelain frame, micro-thin window, missile radar antenna protection cover, etc. 4. Al2O3 is an ionic crystal with a stable structure. Used in high frequency, high voltage and high temperature, its insulation is still excellent, and the loss is not large, the dielectric constant is not large. It is widely used in the electronics industry for solid extruded circuit board bases, casings and porcelain. Frame, micro glass window, missile radar antenna cover, etc. 5, corundum products have good air tightness, even at high temperatures, they are tightly airtight, so they are widely used in electric vacuum, such as the use of corundum to make a variety of large electronic tube shells, dual in-line package housing in solid microcircuit. 6, corundum insulation materials, such as corundum lightweight bricks, corundum hollow spheres and fiber products, widely used in various high temperature furnace kiln wall and furnace roof, both high temperature and insulation. 7. Transparent corundum products can be used to make lamps and microwave fairings. Further, the Na-b-Al 2 O 3 product is an electrolyte material for producing a sodium sulfur battery. Feature use As a kind of abrasive, corundum is widely used in abrasives. There are many types of corundum. Different types of corundum are used differently. This column will introduce you to the types and specific uses of corundum. Black corundum A derivative of brown fused alumina, the appearance is black. Low hardness but good toughness. It is mostly used for free grinding, such as grinding or rough grinding before plating, and also for coating abrasives, resin cutting sheets, polishing blocks, etc. 2. Sintered corundum Sintered with fine materials of alumina or alumina powder, characterized by good toughness and can be made into abrasive grains of various special shapes and sizes. Mainly used for heavy-duty grinding steel ingot grinding wheel, suitable for rough-stained stainless steel ingots. 3. Zirconium corundum It is characterized by a slightly lower hardness, but a higher toughness value and a higher strength. Generally, the crystal size is finer and the wear resistance is good. Foreign zirconium corundum abrasives are mainly used for heavy-duty grinding, and are suitable for grinding heat-resistant alloy steel, titanium alloy and austenitic stainless steel. 4. Chrome corundum It is a derivative of white corundum, its appearance is rosy, its hardness is similar to that of white corundum, its toughness is slightly higher than that of white corundum, its strength is high, its grinding performance is good, and its grinding precision is high. Abrasives made from such abrasives have good shape retention. The application range is similar to that of white corundum. It is especially suitable for the grinding and forming of various tools, measuring tools and instrument parts. Generally, chrome corundum has better grinding performance than white corundum. 5. Microcrystalline corundum It is a derivative of brown fused alumina, its appearance color and chemical composition are similar to brown fused alumina. It is characterized by small crystal size (50-280μm), good abrasive grain toughness, high strength and self-sharpness. Suitable for grinding stainless steel, carbon steel, ball-milled cast iron, etc., grinding method is suitable for forming grinding, cutting grinding, fine grinding and heavy-duty grinding. 6. Single crystal corundum The particles of single crystal corundum abrasive are composed of a single crystal and have a good multi-edge cutting edge, high hardness and toughness, strong grinding ability and less heat generation. The disadvantage is high production cost and exhaust gas in production. Waste water is produced with low yield. It can be used to grind hard and tough metal materials, such as stainless steel, high vanadium high speed steel, heat resistant alloy steel, and easily deformable and easily burnt parts. Considering the limitation of production conditions for single crystal corundum abrasives, generally only Recommended for grinding of heat resistant alloys and difficult to grind metal materials. 7. White corundum The hardness of white corundum is slightly higher than that of brown corundum, but it is easy to cut into the workpiece when grinding. The self-sharpness is better, the calorific value is small, the grinding ability is strong, the efficiency is high, and the price is higher than brown corundum. Suitable for high hardness steel, such as high speed steel, high carbon steel, hardened steel, alloy steel and so on. 8. Brown corundum The appearance of brown corundum is tan, with a content of 94.5%--97%. It has the characteristics of high hardness, high toughness, sharp particles and low price. It is suitable for grinding high tensile strength metals. In the absence of other abrasives, it can generally be replaced by it. Widely used in rough grinding of ordinary steel, such as: carbon steel, general alloy steel, calcinable cast iron, hard bronze and so on. The second grade abrasive of brown corundum is often used as a grinding wheel and a resin cutting wheel. 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