Tijolo de isolamento Mullite

Description of Mullite Insulation Brick

Mullite insulation brick is also called mullite lightweight brick, and it is a refractory material based on aluminum silicate. The alumina fluctuates between 40% and 77%, which has excellent thermal insulation performance. Mullite thermal insulation bricks contain mullite ore, which is made through high-temperature expansion treatment to cast bricks with light weight and excellent thermal insulation performance. In addition to mullite, mullite bricks with low alumina content also contain glass phase and cristobalite; those with high alumina content also contain a small amount of corundum. It can directly touch the flame, the bulk density is 0.55-1.35g/cm3, and the compressive strength is 1.2-4.5Mpa.

OBTER PREÇO

Kerui Mullite Insulation Brick Technical Data Sheet

Item/Grau	JM-23			JM-26				JM-28			JM-30
ω (Al2O3)/%	42	45	48	54	55	56	56	64	65	66	72	72
ω (Fe2O3)/%	1.2	1.0	1.0	0.9	0.8	1.0	1.0	0.75	0.65	0.65	0.55	0.55
Densidade a granel (g/cm³)	0.6	0.8	1.0	0.7	0.8	0.9	1.0	0.8	0.8	1.0	1.0	1.1
Resistência ao esmagamento a frio/MPa	1.5	2.3	3.0	2.0	2.3	2.8	3.2	2.3	2.8	3.3	3.0	3.5
Variação Linear Permanente/%	-0.55	-0.4	-0.3	-1.0	-0.65	-0.5	-0.5	-1.0	-0.8	-0.7	-0.9	-0.7
	1260℃×12h	1300℃×12h	1300℃×12h	1400℃×12h	1400℃×12h	1400℃×12h	1400℃×12h	1500℃×12h	1500℃×12h	1500℃×12h	1600℃×12h	1600℃×12h
Condutividade térmica 350℃ ≤/[W/(m-K)]	0.19	0.24	0.31	0.21	0.25	0.30	0.32	0.28	0.32	0.34	0.40	0.43

Advantages of Mullite Insulation Brick

Excelentes propriedades de isolamento

Os tijolos de isolamento de mulite são bem conhecidos pelas suas propriedades isolantes devido à sua baixa condutividade térmica que impede a perda de calor, o que os torna um material isolante ideal para fornecer isolamento a altas temperaturas.

Material leve

O desempenho dos tijolos de mulite na redução da atmosfera é muito estável. Em particular, o elemento cálcio que contém torna-o resistente à corrosão e funciona de forma estável durante muito tempo a altas temperaturas.

Resistência ao choque térmico

A excelente resistência ao choque térmico dos tijolos de isolamento de mulite permite-lhes suportar o choque térmico da rejeição. Quer se trate de um aumento ou diminuição súbita da temperatura, os tijolos de isolamento de mulite podem manter a sua própria integridade sem fissuras ou danos. Este excelente desempenho torna-o muito adequado para fornos industriais em ambientes de alta temperatura, etc.

Resistência à corrosão

Embora os tijolos de isolamento de mulite sejam leves, têm uma estrutura estável, podem suportar muita pressão e têm uma excelente resistência à compressão.

Manufacturing Process of High Alumina Insulation Brick

Prepare Raw Materials

Prepare a certain amount of high alumina bauxite and composite refractory clay containing Al2O3 as raw materials, and add additives. Such as silica fume, kaolin, aluminum silicate, etc. These additives can improve the fire resistance, stability, and thermal stability of bricks.

Molding

Grind and mix the above prepared raw materials, and put the mixed material into the mold, and shape it by pressing. At the same time, a certain amount of wet binder can be added to improve the plasticity of the brick, which can make the powder particles have a strong binding force during the molding process.

Drying

Drying is putting the formed bricks neatly in the drying equipment or kiln to remove excess moisture in the bricks. The drying process often goes through several stages, the first is initial drying, usually at a lower temperature, which can drain the moisture on the brick surface, just by natural wind. Afterward, heating and drying, as the temperature of the equipment gradually increases, promotes the evaporation of moisture inside the brick body but avoids excessive drying and damage to the rotation body. After the drying time, the device can be used to detect whether it is completely dry.

Sintering

The dried bricks are heated and calcined in a high-temperature kiln. The temperature is 1380℃. During the sintering process, the alumina in the raw materials begins to melt and react with other components. Particles bond stronger to form a complete and compact brick.

Cooling

Cooling is the last step in the production process of high alumina insulation bricks. After the calcination is completed, the temperature of the bricks is gradually lowered to room temperature.

Application of Mullite Insulation Brick