Mullite Bricks and Zirconium Mullite Bricks for Glass Kiln

The main component of mullite brick is alumina (Al2O3), with a content of about 65% to 75%, mainly composed of mullite (3Al2O3·2SiO2), and may also contain a small amount of glass phase and quartz or corundum. Mullite brick has the characteristics of high melting point and creep resistance, and is mainly used in high temperature environments such as hot blast furnace top, blast furnace body and furnace bottom, glass melting furnace regenerator, and ceramic sintering furnace.
Zirconium mullite bricks are made of high-alumina bauxite through a specific formula and process. They are composed of about 72% Al2O3 and 28% SiO2, and the main crystal phases are mullite and corundum. Zirconium mullite bricks have better resistance to erosion by molten glass, low thermal expansion coefficient, and good thermal shock resistance. They are suitable for masonry of glass kiln pool walls, observation holes, wall buttresses, etc., especially on the working surface in contact with molten glass, showing better erosion resistance.

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Description

Corundum-mullite bricks are corundum-mullite refractory products composed of corundum and mullite main crystal phases. Corundum-mullite bricks refer to refractory products made of high-purity or relatively pure raw materials. The presence of low-melting-point oxide impurities will reduce its high-temperature performance.

Performance Corundum-mullite bricks have good high-temperature strength, high-temperature creep resistance, thermal shock resistance and erosion resistance. The physical and chemical properties of a typical corundum-mullite brick are: Al2O3>85%, Fe2O30.45%, apparent porosity 19%, room temperature compressive strength greater than 55MPa, load softening temperature greater than 1700℃, heating line change (1600℃, 3h) -0.1%, thermal shock resistance (1100℃ water cooling) greater than 30 times.

Products Description

Manufacturing process Synthetic mullite is usually used to make corundum-mullite bricks. Mullite particles can be used as aggregates and α-Al2O3 powder as powder, or electro-fused or sintered corundum particles can be used as aggregates and synthetic mullite powder as powder. Aggregates and powders are mixed in a certain proportion and particle size distribution, and sulfite pulp waste liquid and other materials are used as binders. The materials are added in a certain order, fully mixed and evenly kneaded, and formed with a friction brick press or a hydraulic brick press. After the bricks are dried, they are fired at 1650~1750℃.

Some corundum-mullite bricks use electro-fused or sintered corundum sand as aggregates, and bauxite or clay mixed fine powder with a high α-Al2O3 composition ratio of mullite or corundum-mullite as powder for mixing and brick making. The products made by this process have a slightly poor density, so this process is not widely used.

Key points of the process: Pure mullite raw materials synthesized from industrial alumina powder and pure clay, bauxite or silica are used, especially the content of alkali metal oxides should be as low as possible. Products made from mullite particles as aggregate have good thermal shock resistance, but slightly poor erosion resistance. Products made from corundum sand as aggregate have good corrosion resistance, but slightly poor thermal shock resistance.

Use: Corundum-mullite bricks are mainly used in high-temperature hot air furnaces, as well as in glass melting furnaces and as ceramic firing kiln tools.

Brand/ltem	Mullite brick	Burned bricks based on fused mullite	Corundum mullite brick	Corundum mullite brick	Low Porosity fused corundum brick	Zirconia	Zirconia	Zirconia-Mullite	Zirconia-Mullite
	HXM70G	HXDM75S	HXGM-80	HXGM-85	HXG95	HXZ64	HXZ65	HXAZ-20	HXAZ-18
Al₂O₃ %	≥70	≥75	≥80	≥85	≥95	≤1.0	≤1.0	≥60	≥70
Fe₂O₃ %	≤0.5	≤0.3	≤0.5	≤0.5	≤0.5	≤0.3	≤0.3	≤0.5	≤0.5
ZrO₂ %						≥64	≥65	≥20	≥18
SiO₂ %	≤28	≤24	≤19	≤14	≤2	≤34	≤33
Apparent Porosity %	≤18	≤17	≤20	≤20	≤15	≤18	≤18	≤20	≤20
Bulk Density g/cm³	≥2.55	≥2.7	≥2.65	≥2.75	≥3.25	≥3.65	≥3.75	≥3.05	≥3.20
Cold crushing strength MPa	≥90	≥90	≥90	≥90	≥80	≥90	≥90	≥80	≥80
Permanent Linear Change1500℃×2hr	±0.1	±0.1	±0.2	士0.2	±0.2	±0.1	±0.1	±0.1	±0.1
Refractoriness under Load 0.2MPa,KD ℃	≥1650	≥1700	≥1650	≥1650	≥1700	≥1650	≥1650	T2≥1650	T2≥1650
Thermal shock stability (1000℃ water cooling)	≥20	≥20	≥20	≥20	≥20			≥20	≥20
Application	Glass kiln upper structure, channel bricks, cover plates, and molding parts	Thermal furnace upper structure, E glass melting arch roof, arch brick	Glass kiln upper structure, channel bricks, cover plate, forming parts	Glass kiln upper part Structure, channel bricks, cover plate, forming parts	Regenerator magnesia bricks and silica bricks as transition bricks. Thermal kilns, high temperature areas	This series of products has good resistance to alkali steam and thermal shock, and is mainly used in the flame space of glass kilns, heat storage chambers, arch bricks and wall bricks, and upper checker bricks. It can also be used as the bottom or bottom sub-layer and the large bricks of the material channel.
Remark	The values in brackets are applicable to special-shaped products such as feeding mechanisms and handmade brick indicators

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