以硅藻土、纤蛇纹石、高岭土为原料,通过压力成型和高温煅烧制备了轻质多孔的硅藻砖.继而系统研究了这种硅藻砖的容重、吸水率、显气孔率、断裂模数、吸放湿等物理性能,并采用X射线衍射和扫描电镜对硅藻砖的结构与形貌进行了表征分析.结果表明:随着纤蛇纹石含量以及煅烧温度的增加,硅藻砖的吸水率、孔隙率逐渐下降,但是断裂模数显著增加.当纤蛇纹石含量为10wt%、煅烧温度为900 ℃时,硅藻砖的断裂模数超过10 MPa,容重仅为1.18 g/cm3,显气孔率高达47.97%,具有高强、轻质、多孔特点,并兼具良好的吸放湿性能.
Lightweight porous diatoms brick was prepared through compression molding and calcination using diatomite,chrysotile and kaolin as raw materials.The systematic investigations on the bulk density,water absorption,porosity,rupture modulus and moisture absorption-desorption of the diatomite brick were carried out.The structure and morphology of the diatomite brick were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM),respectively.The results show that water absorption and porosity of the diatomite brick decrease with the increase of chrysotile content and calcination temperature.On contrary,the rupture modulus of the diatomite brick was increased significantly.The rupture modulus,bulk density and apparent porosity of the diatoms brick are 10 MPa,1.18 g/cm3 and 47.97%,respectively,when the chrysotile content and calcination temperature are 10wt% and 900 ℃.These indicate that the diatomite brick has the prominent advantage of high strength,light weight,porous and well moisture absorption-desorption properties.
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