Refractory insulation materials includes:
(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.