Common tall aluminous brick

Be in our country, common tall aluminous brick is to show what make with tall aluminous alumina is firing goods, go and now is the tall aluminous fireproof data with extensive application.
Make tall aluminous fireproof material with tall aluminous alumina, its technological process basically the method of brick of clay of continue to use. Firing the physics of the process - chemical reaction, basically be aluminous stone of kaolinite, water decompose and not come 2 times petrifaction process.

In agglomeration process, 2 times Molaishi converts reaction is raw material to calcine and the crucial segment that make a brick. The spare part SiO2 that kaolinite and pyrophyllite generate Molaishi and corundum react the Molaishi that form calls Molaishi 2 times each other, 2 times Molaishi changes the volume that has ％ about to expand. 2 times Molaishi changes reaction to begin at 1200 ～ 1300 ℃ , react terminative temperature depends on the condition that resultant achieves a balance. If kaolinite (pyrophyllite) stone can smash adequately and can distributing equably with water aluminium, can tend in 1400 ～ ℃ finish; Conversely, with former a to calcine, both distributing not divide evenly, cannot establish sufficient reaction condition, it is not easy that 2 times Molaishi changes a course be over, the Yi Da in making brick and use long-term hot history even is less than reaction to balance. For example, contain Al2O370 ％ ～ the goods of 75 ％ , answer by content of theoretical calculation corundum few, but real product middling contains 20 ％ ～ 30 ％ corundum, this that is to say, 2 times Molaishi changes reaction unfinished complete.
Range of mutation of index of function of tall aluminous brick is very wide, decide with use place according to products social estate. General component is tall aluminous brick 75, 65, 55 and 48 wait for content of 4 kinds of alumina, still use the special state level of tall aluminous brick without vitreous kiln at present, use commonly general GB2988-2012 of standard of tall aluminous brick.
Above index is basic function demand, press use condition, return Lv of take an examination to fight creep sex and heatproof shake sex. Fight chemical aggressivity to depend on directly Al2O3 content and porosity.
The creep rate of tall aluminous brick is higher it is its main drawback, spend formula by squirm gearshift knowable, microstructure is to basically expand element, and did not concern directly with Al2O3 content. Analyse by microstructure knowable, general tall aluminous brick is petty graininess corundum, fine columnar Molaishi and distributing to be comprised at the vitreous photograph of meantime, the opposite content of such corundum and Molaishi reachs distributinging condition to lead an impact to creep very big. Vitreous photograph distributings between graininess corundum, below high temperature thermic load, vitreous photograph bate causes slip ” of graininess corundum “ , bring about be out of shape. If by Mo Laishi column shape crystal forms solid matrix, can improve the performance that fight squirm relatively. But will always tell, general tall aluminous brick is in 1400 ℃ - the creep rate below 50h-0.2MPa condition can achieve 10 ％ ～ 20 ％ , the constant temperature time that often holds to 50h even arises very big be out of shape.
Annals of fireproof data limited company is in furnace of kiln of Zhengzhou Rong Cheng industrial dedicate oneself to the service of one's motherland, industry of service high temperature is oneself, we bear tens of year the technology is accumulated, active and before look up ground is high temperature industry will make tomorrow make brand-newly, become hard " boiler and expert of liner of furnace of hot project kiln " .