Silicon carbide brick is composed of what chemical composition of silicon carbide brick is a high-tech silicon carbide material formed by mixing high-purity silicon carbide coarse powder and high-activity silicon carbide powder, and recrystallizing it by vacuum sintering at a high temperature of 2450 after grouting molding, and its physical and chemical indexes are: MGO70 85, C l0 20, apparent porosity 3, bulk density 287g cm3, compressive strength 40 50MPa, 1400 flexural strength L0 15MPa. Silicon carbide brick, refractory temperature 1650, thermal conductivity (room temperature) grade, low temperature bending, elongation at break, flexural strength, compressive strength, tensile strength, tear strength, tear strength, core material shape Product features: wear-resistant, corrosion-resistant, good thermal stability, high strength, high thermal conductivity, etc., can be used for aluminum electrolytic cell lining, molten aluminum conduit and ceramic kiln furniture, large and medium-sized blast furnace lower part, furnace waist and belly, aluminum refining furnace lining, zinc distillation tank lining, etc. Silicon carbide brick is made of SiC as the main raw material, containing SiC72 99. It is divided into clay-bonded, Si3N4-bonded, Sialon-bonded, -sic-bonded, Si2on2-bonded and recrystallized silica bricks. Silicon carbide brick is a high-tech silicon carbide material formed by mixing high-purity silicon carbide coarse powder and high-activity silicon carbide powder, and then vacuum sintering at a high temperature of 2450 to recrystallize it after grouting molding. Due to the high purity of its material (SiC99.).5%), so it has good high-temperature mechanical properties, and the high service temperature can reach 1700 meters.
Recrystallized silicon carbide material is suitable for use as kiln furniture, kiln accessories in ceramics, refractories, electric porcelain, electronics and other industries, its significant characteristics are its dimensional stability and high temperature bearing capacity, and has a good energy-saving effect. It can be made into sticks, hollow beams, shed boards and special-shaped parts and other products. RSIC material also has good erosion resistance, high hardness and wear resistance, and can be made into structural components used in metallurgy, machinery, chemical industry and other fields. Key points of silicon carbide brick masonry of blast furnace cooling wall The masonry above the belly of the modern blast furnace has been more used to replace the smooth cooling wall with cooling wall inlaid bricks, (the cooling wall material is mostly cast iron, and the furnace belly has a copper cooling wall) or only in the upper part of the furnace body with 3 4 sections of brick-inlaid cooling wall, the brick wall is integrated, and the brick lining bricks are no longer built, which greatly shortens the construction period of the furnace. Although the quality requirements such as the size tolerance and flatness of the dovetail groove during the production of the cooling wall are higher, the quality of the brick-inlaid masonry is more than the best brick-inlaid material is mostly silicon carbide bricks combined with silicon nitride bricks, which are built with silicon carbide mud. The key points of cooling wall silicon carbide brick masonry are: (1) Before the cooling wall leaves the factory, it should be inspected, accepted and handed over one by one. The key contents of the furnace construction inspection are: the external dimensions and surface flatness of the cooling wall, the shape, size and smoothness of the dovetail groove, whether the inlet and outlet pipes are covered, and the plastic cap. (2) After the cooling wall enters the site, it is flipped with a crane or crane with the bricklaying side facing up. The copper cooling wall is inlaid with bricks on a special operating frame, and it is strictly forbidden for the cooling wall inlet and outlet pipes to directly touch the ground. The cast iron cooling wall does not need a special operating frame, but it should also be flattened and stabilized after being flipped. (3) The surface burrs, floating rust and dirt on the surface of the "dovetail groove" of the cooling wall should be cleaned. (4) Stir the masonry mud in strict accordance with the instruction manual, and the amount of mixing should not be too much each time, and the mud on duty should be used up on duty. The mud should have a certain bonding strength at room temperature, otherwise it should be baked after masonry to avoid loosening and falling off when it is flipped and transported again. (5) The masonry of silicon carbide bricks of the cooling wall is generally carried out row by row from one side to the other, and the thickness of the brick joints is adjusted within the allowable range to ensure that the two sides of the masonry are flush with the end face of the cooling wall. The surface of the masonry should be carefully hooked. (6) During the construction of the silicon carbide brick on the cooling wall, it is strictly forbidden to step on and knock on the cooling water pipe. (7) After the completion of the silicon carbide brick, it should be inspected and accepted one by one and handed over. (8) After the silicon carbide brick, it should generally stand for 48h before it can be reversed and shipped. When flipping and transporting, pay attention to the protection of the inlet and outlet pipes to prevent collisions.