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Synthesis of β-SiAlON Powder by Carbothermal Reduction-Nitridation of Zeolite

机译：沸石碳热还原-氮化法合成β-SiAlON粉末

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摘要

β-SiAlON ceramics have high strength, high hardness, high oxidation and corrosion resistance. It has been fabricated by sintering of Si_3N_4-AlN-SiO_2-Al_2O_3 powder mixture or β-SiAlON powder. Many researchers have synthesized the β-SiAlON powder by Carbothermal reduction-nitridation of SiO_2-Al_2O_3 system or minerals, such as clay. Zeolite is composed of Si, Al and O, and has high specific surface area and very small pore. The purpose of this study is to fabricate β-SiAlON powder by Carbothermal reduction-nitridation of zeolite. Y-type zeolite and carbon powders were mixed in ethanol for 60min. After the slurry was dried, the mixed powder was fired at 1000 to 1450℃ for 0 to 120min in 0.5l/min N_2 flow, followed by heat-treatment at the temperature of 700℃ for 120min in air in order to remove residual carbon. As a result, it was confirmed that the main phase of synthesized powder fired at 1450℃ for 120min was β-SiAlON and the powder was composed of ultra fine particles with 25m~2/g of BET surface area and 70nm of mean particle size. Consequently, zeolite was concluded to be very useful raw material to synthesis very fine β-SiAlON powder.
机译：β-SiAlON陶瓷具有高强度，高硬度，高抗氧化性和耐腐蚀性。它是通过烧结Si_3N_4-AlN-SiO_2-Al_2O_3粉末混合物或β-SiAlON粉末而制成的。许多研究人员已经通过SiO_2-Al_2O_3系统或矿物（例如粘土）的碳热还原-氮化合成了β-SiAlON粉末。沸石由Si，Al和O组成，具有高的比表面积和非常小的孔隙。这项研究的目的是通过碳热还原-氮化制备沸石的β-SiAlON粉末。将Y型沸石和碳粉在乙醇中混合60分钟。将浆料干燥后，将混合的粉末在0.5l / min的N_2流中于1000至1450℃下焙烧0至120分钟，然后在空气中于700℃的温度下热处理120分钟以除去残留的碳。结果证实，在1450℃焙烧120min的合成粉末的主要相为β-SiAlON，该粉末由BET表面积为25m〜2 / g，平均粒径为70nm的超细颗粒组成。因此，认为沸石是合成非常细的β-SiAlON粉末的非常有用的原料。

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