high quality low creep high alumina bricks

Low Creep High Alumina Bricks

Low creep high alumina refractory bricks are a kind of large refractory material with a large proportion in mass. Low creep high alumina bricks are made from it, for their low creep character, it is also called low creep high alumina bricks. Normally it is used in high-temperature industrial furnaces under long-term high-temperature environments. Common low-creep refractory bricks include low-creep high alumina bricks and low-creep clay bricks.

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Introduction of Low Creep High Alumina Bricks

Low creep high alumina refractory is a kind of large refractory material with a large proportion in mass. Low-creep high alumina bricks are made from it, for their low creep character, it is also called low-creep high alumina bricks. Normally it is used in high-temperature industrial furnaces under long-term high-temperature environments. Common low-creep refractory bricks include low-creep high alumina bricks and low-creep clay bricks.

The development of high thermal shock and low creep high alumina bricks is based on the synthesis of M45 mullite fire bricks as the main raw refractory material. The matrix is added with M75 mullite fine powder. Reasonable selection of three stone raw refractory materials (kyanite, andalusite, and sillimanite), refractory soil as the binder, scientific design components, research and development Under 1100℃ water-cooling conditions, the thermal shock stability is greater than 55 times (only fine mesh patterns appear), 1350℃ * 0.2 MPa, 20 ~ 50 h creep rare < 0.2% about high thermal shock low creep high chrome bricks.

Low Creep High Alumina Bricks Characteristics

1. Good thermal shock resistance.

2. Good abrasion resistance.

3. Good corrosion resistance.

4. Good high-temperature mechanical strength.

5. Good volume stability, and low creep rate.

With the development of modern smelting technology, hot blast stoves generally adopt high air temperature technology, and the service life of hot blast stoves is required to be longer: therefore, higher requirements are put forward for the comprehensive performance of refractory materials for hot blast stoves. Damage to refractory materials used in hot blast stoves is usually caused by thermal stress, chemical attack, and mechanical loading. It is generally believed that an essential reason for the damage of the hot blast stove is that the high-temperature creep resistance of the refractory material is poor, resulting in collapse, deformation, and cracking of the refractory lining material, thus causing widespread concern for low creep bricks for hot blast stoves.

Low Creep High Alumina Bricks Applications

Although Low Creep high alumina bricks have very high refractoriness, their refractoriness under load is relatively low. Low creep high alumina bricks have higher mullite content and lower glass phase, so they have higher thermal shock resistance, lower creep rate, and higher refractoriness under load. Low creep high aluminum bricks are widely used in high-temperature industrial kilns and furnaces. For example, the inner lining of hot blast furnaces, glass melting tank that doesn’t contact with glass liquid, regenerator checkerwork, and so on.

Low Creep High Alumina Bricks Technical Index

Item	XHJLCB-70	XHJLCB-75	XHJLCB-80	XHJLCB-65	XHJLCB-55	XHJLCB-48
Al₂O₃, % ≥	70	75	80	65	55	48
Refractoriness ℃ ≥	1790	1790	1790	1790	1770	1750
Apparent porosity % ≤	20	20	19	24	24	24
Cold crushing strength MPa ≥	65	70	80	49	44.1	39.2
Reheating linear change rage % ≥	±0.1	±0.1	±0.1	+0.1~-0.4	+0.1~-0.4	+0.1~-0.4
Reheating linear change rage % ≥	1450℃*2h	1500℃*x2h				1450℃*2h
refractoriness under load (0.2Mpa) ℃ ≥	1500	1550	1650	1500	1470	1420
Creep rate % ≤	0.6	0.6	0.7	–	–	–
Creep rate % ≤	1350℃×50h	1450℃×50h	1500℃×50h	–	–	–