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Black Aluminum Oxide Abrasive 70 Grit In China

In the smelting furnace, the white fused alumina crystals develop the following rules: the crystal size gradually decreases from the surface layer of the furnace core, and a few millimeters of crystals can be seen near the surface of the furnace core, while the crystal size of the outer layer (amorphous matter) is observed. The development of pink aluminum oxide crystals in different parts is uneven. 


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Not more than tens of microns. The closer to the core, the more "chain-like" the crystals are. The white aluminum oxide crystals are radially connected to form a clear radial chain. These chains are combined near the surface of the furnace core. Closer. In the "chain" structure, the crystal direction is constant, the hexagonal piece of the crystal is always along the chain direction, perpendicular to the axial direction of the furnace, and the C axis of the silicon carbide abrasive crystal is perpendicular to the chain direction.


The upper and side brown aluminium oxide crystals of the furnace core are larger than the lower part, and the lower part tends to obtain fine crystals and amorphous substances, which is extremely obvious when smelting green silicon carbide. In the silicon carbide layer close to the furnace core, a cavity sometimes occurs, and the cavity generally leads from the lower portion of the furnace to the side portion and the upper portion, so that the inner surface of the fused aluminium oxide crystal cylinder is uneven.


Salt is mainly used in green silicon carbide furnaces. The inner surface of the cavity is in a "melted" state, sometimes with large crystals. Silicon carbide products can be classified according to SIC content, type of binder and amount of addition. The properties of the material depend to a large extent on the bonding between SiC particles in the material. Therefore, according to the arc fused alumina type of bonding agent, silicon carbide products are classified into the following types. :


Oxidized bonded silicon carbide: Al2O3-SiO2 series silicate is used as the binding phase, including brown fused aluminum oxide, clay bonding, mullite bonding and SiO2 bonding SiC. Nitride-bound SiC: a covalent bond compound such as a phase of Si3N4Si2N2O. Self-bonding SiC: including β-SiC bonded SiC and recrystallized SiC. Silicon infiltration reaction SiC: A SiC engineering ceramic material composed of SiC and free silicon. Further, a fused alumina refractory product having a SiC content of 50% or less is generally referred to as a semi-SiC product.


The outer crystals have no orientation and no chain structure. The smelting white aluminium oxide batching list is the most important one in the process documentation, which stipulates the range of the furnace material layout and formulation. Due to the large side effects of salt, the general principle of its addition is to minimize the increase in the production of green silicon carbide. If there are more impurities in the pink fused alumina raw materials, 2%~3% salt can also be added to increase the output of the first grade.


The upper part should be added more, and the lower part should be added less. The black aluminum oxide melting point of salt is 800 'C. Most of the movement direction in the furnace flows from top to bottom. Only a small amount of salt gas moves from bottom to top and moves from the inside to the outside. There is a certain amount of salt in the roasting material. Therefore, it should be added less than the new material method. Smelting black silicon carbide generally does not add salt.


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