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POROUS SI3N4 AND PREPARING METHOD THEREOF WITH HIGH POROSITY AND HIGH ASPECT RATIO FOR FILTERING
POROUS SI3N4 AND PREPARING METHOD THEREOF WITH HIGH POROSITY AND HIGH ASPECT RATIO FOR FILTERING
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机译:具有高孔隙率和高纵横比的多孔SI3N4及其制备方法
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摘要
PURPOSE: Provided are a porous Si3N4 with high porosity and a high aspect ratio for filtering by using inexpensive metal silicon as starting materials, and preparing method thereof. CONSTITUTION: The porous Si3N4 is prepared by the steps of: (a) mixing Si powder with as a first sintering agent, powder of at least one compound of the rare earth element in an amount of 7.5-4.5 parts by weight, based on 100 parts by weight of Si powder calculated as the oxide to obtain mixed powder; (b) adding a binder to the mixed powder; (c) molding the mixture into a molded body; (d) heating the molded body to 300-500 deg.C in a nitrogen atmosphere to remove the binder to form a binder-free body; (e) heating the binder-free body to 1350-1500 deg.C in a nitrogen atmosphere to form a nitrided body; and (f) sintering the nitrided body at 1750-1900 deg.C under nitrogen pressure of 0.1-1 atmospheric pressure.
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机译:用途:提供一种具有高孔隙率和高纵横比的多孔Si 3 N 4,该多孔Si 3 N 4以廉价的金属硅为原料进行过滤,其制备方法。组成:多孔Si 3 N 4的制备步骤如下:(a)将硅粉与至少一种稀土元素化合物的粉末作为第一烧结剂混合,其粉末含量为7.5-4.5重量份,基于100计算为氧化物的Si粉末的重量份,得到混合粉末。 (b)在混合粉末中加入粘合剂; (c)将混合物模制成模体; (d)在氮气气氛中将成型体加热至300-500℃以除去粘合剂以形成无粘合剂的体; (e)在氮气气氛中将无粘合剂的物体加热到1350-1500℃以形成氮化的物体; (f)在氮气压力为0.1-1大气压下于1750-1900℃烧结氮化物。
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