Insulation materials are divided into organic, inorganic, and composite materials. The density of lightweight fire-resistant insulation castables is 0.8-1.2, the density of insulation bricks is 0.6-1.0, and the density of insulation cotton that can withstand high temperatures above 1600 ℃ is 0.13-0.16g/m ³
Refractory insulation materials refer to all materials used to prevent heat transfer and reduce energy loss. Because this type of material is often used primarily to prevent heat transfer, it is also commonly referred to as insulation materials. When used under high temperature conditions (greater than 1000 ℃), it is often referred to as lightweight refractory materials. Insulation materials can be used not only for thermal insulation purposes, but also for cold insulation purposes.
Organic insulation materials have advantages such as high density, light weight, easy processing, and outstanding insulation effects, which are widely used in fields such as construction and chemical engineering. However, organic insulation materials also have their own disadvantages, such as easy deformation, weak aging resistance, poor performance and stability, and easy combustion, which is not conducive to the protection of the ecological environment.
The bulk density of inorganic insulation materials is relatively large, and the insulation effect is relatively low. However, they have many advantages, such as not easy to deform and age, stable overall performance, fire resistance and flame retardancy, stable structure, good performance, long life cycle, easy construction, low overall cost, ecological protection, and recyclability.
Composite materials refer to waste materials that can be treated harmless, have insulation properties, and can be recycled using radiation resistant and heat absorbing materials, rock wool, and even processed crop orange stalks. They are also hollow materials developed through foaming technology and other means, with ideal insulation and heat preservation effects.
Refractory insulation materials generally have the characteristics of small volume density, high porosity, and low thermal conductivity. The bulk density of zirconium insulation cotton is only 128-160kg/m3, with a porosity of over 95% and a thermal conductivity of only about 0.035W/(m&middle; ℃), which is 1/1000 of graphite bricks, 1/500 of silicon carbide bricks, and 1/100 of ordinary clay bricks.
Refractory insulation materials can be divided into:
(1) Low temperature insulation material, used at temperatures below 900 ℃. The main products are diatomite brick, foam asbestos, expanded vermiculite, slag wool, rock wool, glass wool, light mullite brick and other products. In recent years, new varieties such as foam glass and magnesium silicate insulation coating have appeared.
(2) Medium temperature insulation materials are used at temperatures ranging from 900 to 1200 ℃. There are mainly diatomaceous earth bricks, expanded perlite, lightweight clay bricks, ordinary aluminum silicate fibers, and hard calcium silicate products.
(3) High temperature insulation material, with a usage temperature greater than 1200 ℃. The main products include lightweight high alumina bricks, lightweight corundum bricks, lightweight magnesium bricks, hollow ball products, floating bead products, high-purity aluminum silicate fibers, etc.
(4) Room temperature insulation and cold insulation materials, used at or below room temperature. The main varieties are aerated concrete, gypsum products, foamed plastics and other organic heat insulation materials.
What are the insulation materials that can withstand high temperatures above 1600 ℃?
1. Aluminum oxide hollow ball casting material has high re softening temperature, high strength, and good thermal insulation performance. Its usage temperature is generally between 1600 ℃ and 1700 ℃. It is made by melting and blowing industrial alumina in an electric furnace, with a crystal form of a-Al2O3 microcrystals. Using alumina hollow balls as the main body, various shaped products can be made,
2. Aluminum oxide hollow ball brick, used at a temperature of 1680-1800 degrees, with a density of 1.4-1.7g/m ³ Using alumina hollow balls as the main raw material, high-performance micro powder as additives, and organic materials as temporary binders, it is fired at high temperature in a shuttle kiln. The product contains a large number of closed pores, which have the characteristics of light weight, high temperature resistance, good insulation performance, small shrinkage during heavy burning, and excellent thermal shock resistance. It also has strong resistance to corrosive gases and slag.
3. High alumina lightweight brick, with a fire resistance of 1700 degrees and a usage temperature below 1350 ° C, has the function of insulation and energy conservation to reduce energy consumption. High fire resistance; The high aluminum content maintains good performance in a reducing atmosphere.
4. Lightweight mullite bricks are divided into JM23, JM26, JM28, and JM30 according to their grades. They are mainly divided into 1350 mullite bricks, 1450 mullite bricks, 1550 mullite bricks, etc. according to their different usage temperatures. The performance and application of lightweight mullite bricks: high fire resistance, up to 1790 ℃ or above.
5. Containing zirconium insulation blankets, felt, and cotton, with a fire resistance greater than 1600 degrees, a usage temperature of 1410 degrees, a bulk density of only 128-160kg/m3, a porosity of over 95%, and a very low thermal conductivity.