In aluminous aluminous grog, common impurity has TiO2, Fe2O3, K2O, CaO to wait, the effect that its produce to aluminous alumina is as follows:
1, TiO2 is the impurity with the higher content in aluminous alumina. In 2 class aluminous alumina, tiO2 basically fashions solid solution with Molaishi, enter vitreous phase little, aluminous to aluminium agglomeration is adverse, but can raise its high temperature mechanical function: Be in fancy, , in class and 3 class aluminous alumina, tiO2 enters vitreous phase more, increase fluid photograph amount, reduce fluid photograph viscosity, benefit at agglomeration, but adverse to high temperature capability.
2, Fe2O3 also is harmful impurity in aluminous aluminous grog. Every increase 1% Fe2O3, vitreous appearance content increases about 0.7% , the addition of Fe2O3 is unidentified to the influence of Molaishi and corundum content show. Fe2O3 is entered for the most part in process of aluminous aluminous agglomeration advocate brilliant photograph (corundum and Molaishi) fashion solid solution, little part enters vitreous phase, still one part and Al2O3 and TiO2 fashion solid solution (Al2O3 · TiO2, fe2O3 · TiO2) is helpful for promoting agglomeration.
3, the harmful impurity oxide that K2O is aluminous aluminous grog, every increase 1% K2O, vitreous photograph increases accordingly about 7% , mo Laishi content reduces 15%〜20% , corundum quantity increases 8%〜13% . When K2O content increases, original network structure is destroyed, the harmful impurity grow in quantity in vitreous photograph, mechanical to the high temperature of aluminous alumina function is adverse. K2O the action in process of aluminous aluminous agglomeration is block up 2 first Molaishi changes a course, it is to decompose next oneself formation Molaishi (basically be Mo Laishi) .
4, content of the CaO in grog of CaO China aluminous alumina, kind 0.2% , specific area achieves 2% above. When a few CaO exist, can form calcic feldspar, calcic feldspar - Molaishi - between scale quartz in all frit temperature is 1345 ℃ , in all frit group becomes CaO9.8% , al2O3 19.8% , siO2 70.4% . If CaO is contained,be 1% when, its generate in all frit fluid photograph is amounted to 10% , be opposite apparently the high temperature capability of aluminous aluminous grog is adverse.
Often also add a few beneficial constituent to improve the performance characteristics of aluminous alumina in aluminous aluminous grog, if add He Lajing of MgO, ZrO2 stone a group of things with common features is mineral wait.
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