The refractoriness and uses of sintered mullite are as follows:

I. Fire resistance

The fire resistance of sintered mullite is usually above 1750℃. According to different brands, its fire resistance will be different. For example, the fire resistance of sintered mullite of M45 grade is about 1750℃, while that of M70 grade can reach 1850℃. The theoretical melting point of mullite is 1870℃, so sintered mullite can withstand extremely high temperature in practical application, showing good high temperature stability.

II. Uses

Sintered mullite is widely used in many fields because of its excellent properties:

(1) Metallurgical industry

Blast furnace and hot blast stove: Sintered mullite brick can be used in tuyere of blast furnace, vault of hot blast stove and middle and upper part of combustion chamber, with good thermal shock resistance and erosion resistance.

Ladle and tundish: sintered mullite-corundum castable can be used for permanent lining of ladle, tundish and other parts, with high strength and thermal shock resistance.

(2) Ceramic industry

Kiln furniture and furnace lining: sintered mullite can be used to make kiln furniture and furnace lining bricks, etc., with good thermal shock resistance and erosion resistance.

Ceramic mold: The high hardness and low porosity of sintered mullite make it an ideal material for making ceramic molds.

(3) Glass industry

Glass melting furnace: Sintered mullite brick can be used in the crown, pool wall and other parts of glass melting furnace, which can resist the erosion of high-temperature molten glass.

Forming stage: mullite brick is the key refractory for building the float glass kiln in the forming stage.

(4) Other fields

Electronic packaging: sintered mullite can be used to make electronic packaging materials because of its good high temperature stability and corrosion resistance.

Aerospace: Sintered mullite can be used for high-temperature components such as combustion chambers of aerospace engines, and has extremely high fire resistance and thermal shock resistance.

Petrochemical and electric power: sintered mullite can be used in petrochemical liquid catalytic converters and high-temperature equipment in electric power industry.

The high refractoriness and excellent physical and chemical properties of sintered mullite make it have an irreplaceable position in high temperature industry.