Ladrillo aislante de mullita

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.

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Kerui Mullite Insulation Brick Technical Data Sheet

Artículo/Grado	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
Densidad aparente (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
Resistencia al aplastamiento en frío/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
Cambio lineal 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
Conductividad 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 propiedades aislantes

Los ladrillos aislantes de mullita son muy conocidos por sus propiedades aislantes debido a su baja conductividad térmica, que impide que se pierda calor, lo que lo convierte en un material aislante ideal para aislar a altas temperaturas.

Material ligero

El rendimiento de los ladrillos de mullita en la reducción de la atmósfera es muy estable. En particular, el elemento de calcio que contiene lo hace resistente a la corrosión y funciona de forma estable durante mucho tiempo a altas temperaturas.

Resistencia al choque térmico

La excelente resistencia al choque térmico de los Ladrillos Aislantes Mullite les permite soportar el choque térmico del rechazo. Tanto si se trata de un aumento como de una disminución repentina de la temperatura, los Ladrillos Aislantes Mullite pueden mantener su propia integridad sin agrietarse ni dañarse. Este excelente rendimiento lo hace muy adecuado para hornos industriales en entornos de alta temperatura, etc.

Resistencia a la corrosión

Aunque los ladrillos aislantes de mullita son ligeros, tienen una estructura estable, soportan mucha presión y tienen una excelente resistencia a la compresión.

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