粒度对合成堇青石粉相变和烧结性能的影响研究

Influence of Particle Size on Phase Transformation and Sintering Properties of Synthetic Cordierite Powder

以菱镁矿渣、高铝粉煤灰、硅酸为原料,尿素为燃料,用低温燃烧法简便快捷地合成堇青石前驱粉。在堇青石前驱粉中加入适量的粘结剂于170 MPa下干压成片,在不同温度下烧结,获得堇青石基耐火材料。利用排水法测量烧结体的密度,分析不同粒度的粉体对低温燃烧合成堇青石粉烧结性能的影响,并通过x-射线衍射分析样品的物相,研究不同粒度的粉体对堇青石析晶性能的影响。结果表明:低温燃烧法制备堇青石基耐火材料的析晶过程为:非晶态至μ-堇青石再到α-堇青石。在同温同压的同等条件下,用粒度小的前驱粉比用粒度大的前驱粉更有利于α-堇青石晶相的获得。

Magnesite slag,high alumina fly ash and silicic acid are used as raw materials,and urea was used as fuel,and the cordierite precursor powder was simply and quickly synthesized by low-temperature combustion method.The cordierite precursor powder was added with an appropriate amount of binder,and it was dry pressed at 170 MPa into a sheet,and sintered at different temperatures to obtain a cordierite-based refractory material.The density of the sintered body was measured by the drainage method,the influence of different particle sizes of powder on the sintering performance of low-temperature combustion synthetic cordierite powder was analyzed,and the phase of the sample was analyzed by x-ray diffraction to study the effect of different particle size powder on the crystallization of cordierite performance impact.The results show that the crystallization process of cordierite-based refractories prepared by low temperature combustion is as follows:amorphous to μ-cordierite and then to α-cordierite.Under the same conditions at the same temperature and pressure,using the precursor powder with a small particle size is more favorable for obtaining the α-cordierite crystal phase than using the precursor powder with a large particle size.