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首页> 外文期刊>Powder Technology: An International Journal on the Science and Technology of Wet and Dry Particulate Systems >Powder metallurgy magnesium composite with magnesium silicide in using rice husk silica particles
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Powder metallurgy magnesium composite with magnesium silicide in using rice husk silica particles

机译：稻壳二氧化硅颗粒的硅镁粉末冶金镁复合材料。

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By using the solid-state reaction of rice husk silica particles with magnesium powder,P/M magnesium based composites dispersed with the magnesium silicide(Mg2Si)and magnesium oxide(MgO)were fabricated.High-purity silica particles were originated from rice husks,one of the major agricultural wastes,via the citric acid leaching treatment and combustion in air.The effects of the silica particle characteristics such as size,crystalline and porous structures,on the reactivity of silica and magnesium to synthesize Mg2Si intermetallics were discussed.As the results by DTA and XRD analysis,finer silica particles were more effective for the solid-state reaction at low temperature due to the increase of their surface area contacted with magnesium powder.Amorphous silica was also more useful for this reaction than the crystalline one.The reactivity of rice husk silica was superior to that of the conventional mineral silica particles not only because of its amorphous structure but also the larger specific surface area due to their pore structures.In the case of the green compact of the elemental mixture of silica particles and Mg powder,the silica particle size was not effective on the reactivity because the coarse particles were fractured into fine ones by cold compaction.The distribution of Mg2Si intermetallics of magnesium powder composites consolidated by SPS process was investigated by XRD and SEM-EDS analysis.When the sintering temperature was over the exothermic temperature of the mixture in the DTA profile,the synthesis of Mg2Si completely occurred during sintering.The sinterability of the elemental mixture powder was improved when employing the amorphous rice husk silica particles.The density and hardness of their composites sintered over the ignition temperature of the DTA profile were remarkably high because of the good densification by the high reactivity and the distribution of Mg2Si hard compounds,
机译：通过稻壳二氧化硅颗粒与镁粉的固相反应，制备了分散有硅化镁（Mg2Si）和氧化镁（MgO）的P / M镁基复合材料。高纯度二氧化硅颗粒来源于稻壳，通过柠檬酸浸出处理和在空气中燃烧，将其作为主要的农业废弃物之一。探讨了二氧化硅颗粒特性（如大小，晶体和多孔结构）对二氧化硅和镁的反应活性，以合成Mg2Si金属间化合物。根据DTA和XRD分析的结果，由于与镁粉接触的表面积增加，细二氧化硅颗粒在低温下对固态反应更有效。无定形二氧化硅也比结晶二氧化硅更有效。稻壳二氧化硅的反应性优于常规矿物二氧化硅颗粒，这不仅是因为其无定形结构，而且还具有更大的对于二氧化硅颗粒和Mg粉末的元素混合物的生压坯，二氧化硅颗粒的大小对反应活性没有影响，因为通过冷压将粗颗粒破碎成细颗粒。通过XRD和SEM-EDS分析研究了SPS固结镁粉复合材料中Mg2Si金属间化合物的分布。当烧结温度超过DTA曲线中混合物的放热温度时，Mg2Si的合成完全在烧结过程中发生。使用无定形稻壳二氧化硅颗粒可改善元素混合物粉末的烧结性。由于高反应性和Mg2Si的分布良好，致密性良好，因此在DTA型材的着火温度下烧结的复合材料的密度和硬度非常高。硬质化合物

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