Green silicon carbide range of applications and key raw materials smelting

Green silicon carbide range of applications is gradually changing, and it is constantly rising trend in walking , silicon carbide main types of black and green , in today's high-tech refractory materials , silicon carbide is the most widely used products . Can be called emery or refractory sand .
Where: Green silicon carbide is petroleum coke and quality silica as the main raw material, add salt as an additive in electric arc furnace smelting . Green , high hardness and cutting ability, chemical stability , good thermal conductivity . High purity , brittle , microhardness 3280-3400 kg / mm2. It is made of abrasive, suitable for processing high hardness, brittleness of the material , its hardness between corundum and diamond , the mechanical strength is higher than corundum . Mainly used for grinding hard gold-bearing instruments . Green silicon carbide containing SiC99% or more, good self-sharpening , mostly used for machining tungsten carbide, titanium and optical glass , also used for grinding cylinder liners and grinding high-speed steel cutting tools.
Green Silicon Carbide Applications:
Do bonded and coated abrasives , and polishing and so on. Suitable for machining cast iron , tungsten carbide , titanium , high-speed steel. Can grind glass, ceramics, stone , agate and jade and other non-metallic materials, fine jewelry , heating elements and thermal elements . Such as carbide , optical glass, glass and ceramics brittle ma non-metallic materials , can also be used to manufacture high-grade refractory , electric components and electrical component products. There is also cubic silicon carbide, which is based on a special process to take the yellow-green crystals, suitable for the production of abrasive bearing super finishing , make the surface roughness Ra32 ~ 0.16 microns from primary processing to Ra0.04 ~ 0.02 microns.
The physical properties of green silicon carbide is better, in the major industries in the area has a significant role , is very important .

Green silicon carbide powder raw material selection

Green SiC is a high-tech refractory , has been in use in various industries , more and more , and it has many excellent performance in a high-performance products , silicon carbide, green silicon carbide and black can be divided into carbonization silicon , here to introduce you to a green silicon carbide powder of raw material selection , I hope for your help .
Green silicon carbide is quartz sand and coke for raw materials as a good thermal conductivity , high hardness of man-made materials . Silicon carbide powder is widely used in refractory, wear-resistant flooring , ceramic foam , specialty coatings, corrosion-resistant paint, flow separation and environmental protection industries , green silicon carbide even at high temperatures also have high strength , elastic modulus at the temperature reaches its 1600 ℃ , began attenuation. At a temperature of 2815 ° C begin to separate , but it does not melt at atmospheric pressure . Green silicon carbide grain of sand can quartz sand and coke as raw materials, manufacture green silicon carbide powder with a grain of sand , and you can choose as raw materials of sand . Green silicon carbide powder raw materials first look at the color , the second depends on the hardness , the third depends on the content .

Green silicon carbide on the performance and introduces the main purposes

Presumably there are many people in the choice of green silicon carbide does not know when its purpose and performance is what? Hope to explain below, we will further green silicon carbide silica fume for mastery.
At least 70 kinds of green silicon carbide crystal patterns. α-SiC is the most common form of allomorphic matter, in temperatures above 2000 ° C to form, with a hexagonal crystal structure (like wurtzite). β-silicon carbide, cubic crystal structure, and diamonds are similar, below 2000 ° C generated. Although the heterogeneous catalyst carrier body applications, because of its higher than α type of unit surface area and compelling, but until now, there has not been this type of commercial applications.
And a high proportion of its 3.2 sublimation temperature (about 2700 ° C), silicon carbide is suitable as raw materials for high-temperature furnace bearing or objects. Can be achieved at any pressure, it will not melt, and has a relatively low chemical activity. Because of its high thermal conductivity, high breakdown electric field strength and high maximum current density, the recent high-power semiconductor devices in applications, many people try to use it to replace silicon.
Pure silicon carbide abrasive is a colorless, while the industrial production of brown to black iron is due to the impurities. Crystal rainbow sheen is generated on the surface of the silicon dioxide because of its protective layer due.
Green silicon carbide for compound semiconductor materials, lightning, circuit elements, high-temperature applications, UV detectors, structural materials, astronomy, disc brakes, clutch, diesel particulate filter, filament pyrometer, ceramic films, cutting tools , heating elements, nuclear fuel, jewelery, steel, protective gear, catalyst carrier body and other fields.
Through the above and on the performance of green silicon carbide main purpose of introduction, I hope to bring you help.

Corundum brief analysis of the composition and uses

Corundum based on industrial alumina powder as raw material in the arc by melting temperatures above 2000 degrees made. Corundum main chemical ingredient is AL2O3, the content of a 98.65% -99.37 % , and the other a small amount of Fe, Si, Ti and so on. Corundum behalf # "WA" on internationally accepted standards, national standards, most for export, there is a certain amount of supply domestic users . Prominent feature is the small crystal size impact resistance, due to a self- processing mill crushed particles are mostly spherical particles , dry surface cleaning, easy binding agent combination .
Corundum is high-quality aluminum oxide powder as raw material , through the fused corundum sand refining crystal, high purity, good self-sharpening , acid corrosion , high temperature, thermal properties and stability. Slightly higher than corundum corundum hardness , toughness slightly lower , high purity, good self-sharpening , grinding ability , heat a small , high efficiency, acid and alkali resistance , high temperature resistance and good thermal stability . Made with corundum abrasive sand , suitable for grinding high carbon steel , high speed steel and stainless steel fine-grained abrasive . Corundum of sand can also be used for precision casting and high-grade refractory .

What are the methods of making corundum

Corundum structure is very special, and general usage of corundum is different, following a brief introduction about the purpose of corundum .
Corundum high quality bauxite as raw material, anthracite , iron Xiao , in the arc melting temperatures above 2000 degrees by made ??by shaping from the mill grinding , magnetic separation to iron , sieving into a variety of particle size , its dense texture , hardness high formation of spherical particles , for the manufacture of ceramic , resin high abrasive and grinding, polishing , sandblasting, precision casting , etc., can also be used to manufacture advanced refractories .
Corundum with high purity, good crystalline liquidity, low coefficient of linear expansion , corrosion-resistant characteristics. After dozens of proven refractory manufacturer , the product in the application process has not detonate , not powder, not crack characteristics. In particular, its price is much higher than conventional corundum , and more to become the best corundum refractory aggregate and filler.
Particle size in accordance with international standards and national standards of production, processing granularity according to user requirements . General size number of F4 ~ F320, depending on its chemical composition and different particle sizes . Prominent feature is the small crystal size , impact resistance, due to a self- processing mill broken particles are mostly spherical particles , corundum with high purity, dense texture , bulk density, self-sharpening strength , good toughness, magnetic material Features ultra-low levels , with its made of abrasive grinding sharp , low fever , grinding ratio .

Good or bad way to distinguish quality corundum

Corundum as one of the common resistant material , often involved in the manufacture of wear-resistant products . Especially the production of wear-resistant castable . Castable kind of common ways of its production is to corundum powder and bauxite with a certain proportion of the mixer is made in accordance with certain resistant castable . The material can be used as a variety of high-temperature furnace masonry materials can also be made using prefabricated parts or unfired brick . Corundum in industrial applications , there are many , then how to distinguish corundum and the bad?
Corundum is made ??of carbon , Alumina Oxide , iron three kinds of raw material refining , because the color of iron should be presented so that high-quality brown corundum , corundum observed color is a way to distinguish . Three brown fused alumina is the composition of substances. Three alumina content is directly related to how much good or bad quality corundum . Corundum is divided into three , one of the best is a corundum , followed by two and three , corundum quality standards is mainly to see where AL2O3 content , content of more than 95% of a corundum, that is, we often say that the 95 corundum . Two and three corundum corundum content progressively reduced , the quality decreases. You can see the color purity corundum to distinguish , as corundum containing Fe (iron ) elements , Fe element is reddish-brown , tan it rendered as corundum , you can see by looking at the color to identify the level and quality of corundum .

Corundum refractories used in

Brown fused alumina is a high-grade synthetic material. Is the use of high-quality bauxite as main raw material, coke, iron and other auxiliary materials, high-temperature smelting in electric arc furnace purified from.
Generally were brown corundum, Al2O3 ≥ 94.5%, SiO2 ≤ 2.5%, TiO2 ≤ 3.5%, Fe2O3 ≤ 1%, mineral composition to α-Al2o3 main center of the diamond-shaped crystal, slab type and with crack particles have more peripheral silicon oxide, calcium Melt Crystallization, elongated plate, the coarse crystal grains become skeletal-like sheet. Corundum hue is largely dependent on the remnants of the titanium oxide.
Corundum is mainly used as an abrasive. Refractory materials have been widely used in recent years, such as hooks castable, no blisters mud, corundum brick, precast, air brick, ladle brick, magnesia carbon bricks.
Brown fused alumina for refractory aggregate and powder is generally used to do, it has the advantage of high refractoriness, wear resistance, erosion, corrosion, bulk density, high alumina content, mainly for aluminum lines and alumina. When do products have a high load softening temperature and high temperature volume stability. But corundum impurities in the products in the course of life. Since smelting impurities not removed completely, so corundum also contains six calcium aluminate, calcium plagioclase, spinel, rutile and other times crystalline phase and glass phase, ferro alloys and solid solutions. In a large sense, corundum smelting process and smelting time determines the performance and quality of its products.

Corundum and corundum abrasives

By fused corundum sand to produce high-quality bauxite corundum, and used to produce high-quality aluminate powder corundum and corundum. Their natural crystal structure of its high hardness, fast cutting performance. And they are often used as bonded abrasives and coated abrasives raw materials.
Corundum can be recycled many times, cycle times and material grade and the specific processes related to most standard abrasive blasting equipment can be used.
Corundum (aluminum oxide) for a variety of wet and dry treatment process, the workpiece can be any rough surface fine polished, is one of the most affordable abrasive. Such a sharp abrasive synthetic water chestnut has a hardness second only to diamond, iron particularly suitable for use when there are strict requirements pollution. It is used for the rough cutting can also be made to precise dimensions pebble-shaped workpiece is processed to achieve a very low roughness. Due to its high density, sharpness, water chestnut structure, so it is currently one of the fastest cutting abrasive.
Applicable to industrial range: aerospace, automotive, consumer products, casting / die casting, OEM distributors, semiconductor industry and other different fields.
Applicable range of technology: surface plating, painting, glazing and coating Teflon pretreatment; aluminum and alloy products deburring, go to boiler scale; mold cleaning; Metal Blast pretreatment; dry and wet ; precision optical refraction; minerals, metals, glass and crystal grinding; glass sculpture and paint additives.

The use of alumina , alumina is mainly used in what areas

Alumina is a white amorphous powder , commonly known as bauxite , density 3.9-4.0g/cm3, melting point 2050 ℃, boiling point 2980 ℃, insoluble in water, aluminum oxide mainly two kinds of α -and γ variants industrially from bauxite is extracted .
Now a lot of aluminum products such as : aluminum hydroxide, alumina, calcined alumina high temperature alumina purity alumina industrial grade white aluminum hydroxide aluminum hydroxide, aluminum hydroxide toothpaste grade agate grade aluminum hydroxide filler grade aluminum hydroxide and so on. Wide range of applications regardless of alumina products economic development or life has its existence, it has played an unparalleled role.
Specialty alumina refractory varieties: Advanced ceramic refractory products fiber products as well as lightweight insulation products unshaped products , with its main application areas are:
( 1 ) ultra-high temperature kiln lining structural materials.
( 2 ) high purity metal alloys with rare metals smelting crucible purification .
( 3 ) high-temperature tube furnace thermocouple tube heat insulation.
( 4 ) high-temperature kiln sticks and briquetting pressure washers , etc.
( 5 ) Petroleum and Chemical Industrial temperature corrosion-resistant lining material .
( 6 ) do transparent alumina ceramic high-temperature high-pressure sodium viewing glass tube microwave hood .
( 7 ) in the electronics industry to make the circuit substrate voltage ceramic shell and tube seat tube radome spark plugs and so on.
( 8 ) grinding tools and abrasives such as grinding wheel cutting disc Dies La Sita round nozzles textile porcelain pieces and a variety of high-temperature resistant bearing props .
( 9 ) Chemical Industrial Piston Pump Parts sealing ring.
( 10 ) ferrous metallurgy industry molten metal pipe.
( 11 ) in various industrial sectors such as high-temperature energy-efficient materials like alumina hollow ball alumina whiskers, alumina fiber and products .