Series of corundum mullite brick

Corundum mullite brick is compounded with corundum and mullite as the main mineral phases. It is produced by taking high-purity alumina raw materials and bauxite clinker as main materials, through proportioning, mould pressing and high-temperature sinter

Al₂O₃ : 80

Bulk density : 2.85g/cm³

Apparent porosity : 18 %

Cold crushing strength : 100 MPa


   PRODUCT DESCRIPTION

Introduction

Corundum mullite brick is compounded with corundum and mullite as the main mineral phases.

It is produced by taking high-purity alumina raw materials and bauxite clinker as main materials, through proportioning, mould pressing and high-temperature sintering. Its alumina content is generally between 65% and 90%.

Combining the merits of corundum and mullite, it overcomes the poor thermal shock resistance of pure corundum bricks and the insufficient high-temperature strength of ordinary mullite bricks, belonging to a premium refractory material widely used in medium and ultra-high temperature industrial furnaces.

 

Features

High temperature performance stable: High refractoriness and load softening temperature, low high-temperature creep, stable structure under long-term high-temperature load.

Excellent thermal shock resistance: Resists frequent cold and hot alternation, not easy to crack or peel under temperature fluctuation.

Strong corrosion and abrasion resistance: Dense structure resists flue gas scouring, dust abrasion and weak acid & alkali slag erosion.

Good stability and compatibility: Superior high-temperature volume stability, neutral property adapts to most furnace working atmospheres.

 

Application

Iron & Steel industry: Middle and lower sections of hot blast stoves, heating furnaces, tundish and refining furnace linings.

Non-ferrous metallurgy: Lining for aluminum, copper and zinc smelting furnaces and holding furnaces.

Building materials industry: High-temperature zones of glass furnaces, ceramic tunnel kilns and roller kilns.

General thermal equipment: Industrial boilers, incinerators and petrochemical high-temperature furnaces.


   TECHNIQUE DATA


Index  Corundum-mullite bricks (GM-80)
  Standard Typical 
Al2O3, %8083.75
SiC, %
Fe2O3, %0.80.53
Apparent porosity ,%1815.8
Bulk density ,g/cm32.853.02
Cold crushing strength ,MPa100125
0.2MPa refractoriness under load0.2MPa ℃17001720
Linear change after reheating (1500∘C×2h), %0~+0.5+0.1
Refractoriness ,℃1790>1790
MOR ,MPa1216.3
Thermal expansion coefficient (1000∘C), %0~+0.70.65
Thermal conductivity (940∘C), W/m·k2.82.2
Thermal shock resistance (1100∘C water cooling, times)20>30
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