Porous acicular mullite obtained by controlled oxidation of waste molybdenum disilicide
Porous acicular mullite obtained by controlled oxidation of waste molybdenum disilicide
复制标题
DOI：
10.1016/j.materresbull.2013.10.044
复制
发表时间：
2014-02
影响因子：
5.4
通讯作者：
D. Bučevac;Aleksandra Dapčević;V. Maksimović
中科院分区：
文献类型：
--
作者：
D. Bučevac;Aleksandra Dapčević;V. Maksimović
利用废mosi2加热元件和Al2O3制备多孔针状莫来石。仔细煅烧粉碎的加热元件导致形成moo3和无定形SiO2的混合物。该混合物被用作sio2前驱体和孔隙形成剂。研究了mosi2的氧化和莫来石的形成。研究了制备温度对烧结莫来石的相组成、孔隙率、晶粒形貌和抗压强度的影响。在低至1300℃的温度下，获得了孔隙率超过60%、抗压强度为~ 20 MPa的纯莫来石。其微观结构由细长的、矩形的、棱柱状的颗粒组成，这些颗粒在柴油发动机废气的过滤中是有效的。烧结温度的升高引起了晶粒形貌的变化和抗压强度的降低。
Porous acicular mullite was fabricated by using waste MoSi2heating element and Al2O3. Careful calcination of the pulverized heating element led to the formation of a mixture of MoO3and amorphous SiO2. This mixture was employed as both SiO2precursor and pore former. The oxidation of MoSi2and mullite formation were studied. The effect of fabrication temperature on phase composition, porosity, grain morphology, and compressive strength of sintered mullite was examined. Pure mullite with porosity of more than 60% and compressive strength of ∼20 MPa was obtained at temperature as low as 1300 °C. The microstructure consisted of elongated, rectangular, prism-like grains which are known to be effective in filtration of diesel engine exhaust. The increase in sintering temperature caused the change of grain morphology and reduction in compressive strength.