Ceramic liner composite tube performance introduction
Ceramic liner composite tube performance introduction
Made using self-propagating high temperature synthetic centrifugation. Corundum ceramic tube melting point of 2045 ℃, corundum layer and the steel layer due to the special structure of the process, the stress field is special. Under normal temperature, the ceramic layer is under compressive stress and the steel layer is subjected to tensile stress. The two are in opposition to each other and become a balanced body. When the temperature rises above 400 ℃, the new stress field caused by thermal expansion and the original stress field existing in the ceramic tube cancel each other out, because the thermal expansion coefficients of the two are different, and both the ceramic layer and the steel layer are in a free equilibrium state. When the temperature rises to 900 ℃ lined with ceramic wear-resistant steel pipe into the cold water, repeated soaking repeatedly, the composite layer is not cracked or cracked, showing ordinary ceramic unparalleled thermal shock resistance.
Wear-resistant ceramic lined composite tube mechanism
Ceramic-lined composite pipe and the traditional seamless steel pipe, wear-resistant alloy steel pipe, cast stone and steel, steel and other essential differences. The ceramic-lined composite pipe is composed of corundum ceramic layer, transition layer and ordinary steel pipe from the inside to the outside, respectively. The corundum ceramic layer forms dense corundum porcelain (AL2O3) at high temperature above 2200 ℃ and forms solid with the steel pipe through the transition layer Combined. The wear resistance of ceramic-lined composite pipes is mainly corundum layer a few millimeters behind the inner layer. Its Mohs hardness is 9, second only to diamond and silicon carbide, and its hardness is the highest among all the oxides.
Wear-resistant ceramic-lined composite pipe performance:
(1), physical and mechanical properties
Self-propagating technology makes ceramic composite tube has a unique organizational structure, which determines the excellent physical and mechanical properties of ceramic pipe, which not only wear resistance, corrosion resistance, high temperature, but also high hardness, strength and good resistance to mechanical shock and The overall performance of thermal shock. (2), wear resistance
Ceramic-lined composite pipe and the traditional steel pipe, wear-resistant alloy steel pipe, steel pipe and other essential differences.
The outer layer of ceramic steel pipe is steel, the inner layer is dense a-type aluminum oxide (corundum). Corundum Vickers hardness of 1100-1500 (Rockwell hardness of 90-98), equivalent to tungsten cobalt carbide. Its abrasion resistance is more than 20 times higher than that of carbon steel pipe. It is much better than ordinary bonded corundum grinding wheel. The abrasion resistance of ceramic steel pipe mainly depends on the inner corundum layer, whose Mohs hardness is 9, Diamond and silicon carbide.
(3), corrosion resistance
Ceramic tube with a type of aluminum oxide 90%, aluminum oxide is a neutral oxide, with acid, alkali, salt can not afford chemical reaction, acidity 96-98%, with high corundum porcelain acidity quite, At the same time, aluminum oxide is an inorganic substance, and there is no problem of deterioration (ie, aging) under the long-term effects of light, heat, oxygen and other natural environments. Ceramic layer can be acid, alkali and electrochemical corrosion, the measured corrosion resistance of ceramic pipe ten times higher than stainless steel.
(4), temperature resistance
As the lined a-type alumina is a single stable crystalline structure, and the corundum layer and the steel layer due to the process of structural and stress field is also special, ceramic composite tube in the 50 - 900 ℃ temperature range of long-term use.
(5) running resistance is small
Due to its smooth inner surface and never corroded, the ceramic-lined steel pipe also does not exist like the convex helical wire on the inner surface of the seamless steel pipe. The resistance unit of the water-resistance test is 0.0193. The coefficient of drag is less than that of ordinary steel pipe. Can reduce the pipeline running resistance, reduce operating costs.
(6), anti-fouling
(7), anti-mechanical impact
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