We produce the best quality graphite crucibles and dies with the best quality isostatic graphite for jewellery industry.
We offer casting crucibles, melting crucibles, and graining crucibles for all casting machines.
Beijing Great Wall Co.,Ltd.,are a manufacturer of graphite & carbon products in China and one of the competitive graphite suppliers all over the world .
GW ’s commitment is to supply high quality graphite material, carbon and graphite composites, formed graphite parts.
Please feel free to contact us via savi at bjgreatwall dot cn if you have any enquiry or questions.
Abrasives black fused aluminium oxide
Black fused alumina, also called black fused aluminium oxide, black aluminum oxide, is a black color artificial corundum for abrasives. It's made of fusion of bauxite and reducing agent in electric arc furnace. Black fused aluminium oxide has certain content of ferro oxide and silicon oxide, which make it looks black. Black fused aluminium oxde has moderate hardness, less heat during abrasives, good strength and can be used for sand blasting, polishing, grinding of stainless steel and other non-metal surfaces. It can also be used for production of grinding wheel and cutting wheels.
Production of grinding wheel, cutting wheel and other abrasive tools
Sand blasting and polishing on aluminium, stainless steel and other metal surfaces
Grinding and polishing on non-metal surfaces like ceramic, plastic, glass, wood, laminate, bamboo etc.
Rust removal, clean and polishing of mold, foundry parts, metal parts, semi-conductors etc.
Surface treatment of electric devices, telecommunication equipments, ship and vessel parts, machinery etc.
Eching, die cut of stone, ceramic, marble, glass, jewery
Pre-coating process of electroplate, coating, teflon, welding materials etc.
White fused alumina for refractories
White fused alumina is made from redused fusion of high purity alumina powder whose content is aluminium oxide(al2o3). It has very high refractory temperature, acid and alkali corrosion resistant, stable in chemical content, high true gravity/density, low porosity rate, thermal shock resistant. It's an excellent corundum aluminium oxide refractory material. White fused alumina refractory grades is an important high end material for production of shaped and unshaped refractory products.
Physical and chemical properties
True gravty: ?3.60 g /cm3
Bulk density: 1.5-2 g / cm3
Mosh hardness: 10
Color: white, light blue after heat treatment
Melting point: 2350 celcius degree
Linear expansion coefficient index: (7-9)*10^-6/k (0 - 1600)
Sizes available: 0-1mm, 1-3mm, 3-5mm, 5-8mm, 100mesh, 200mesh, 325mesh
Applications of white fused alumina refractory grades
Alumina bricks, alumina type refractory brick mullite box body, nozzle, spray gun, furnace and oven linear
Unshaped refractory materials like ladle pouring material, drainage sand, spraying and filling material, prefabricated parts
Refractory materials in steel making, metallurgical, cement, glass, ceramic, petrochemical industries
Precision casting and foundry sand
Black silicon carbide for refractories
Black silicon carbide(sic) we make has high hardness, low expansion rate, good chemical stability, good heat conductivity and is widely used in refractory bricks, unshaped refractories, special ceramic products, precision casting, foundry and metallurgical industry.
Physical and chemical properties
True gravity: ?3.15 g /cm3
Bulk density: 1.20-1.60 g / cm3
Mosh hardness: ?9
Color: black
Melting point: 2700 celcius degree
Sizes: 0-1mm, 1-3mm, 3-5mm, 5-8mm, 100mesh, 200mesh, 325mesh or according to request
Applications of refractory grade black silicon carbide
Various shaped and unshaped refractory produccts
Used as semi-conductor antioxidant
Used as deoxidizer in steel making industry to improve steel quality
\production of electric heating element silicon carbon rod
Inner coating on impeller of hydraulic turbine to improve its durability
Graphite crucible is suitable for smelting
copper¡¢aluminum¡¢gold¡¢silver¡¢lead¡¢zinc¡¢
alloys other nonferrous metals. The graphite
material chosen is isostatic graphite¡¢
high strength graphite¡¢high density graphite.
