共查询到19条相似文献,搜索用时 390 毫秒
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研究了低温条件下氧化镁于碱性溶液中水化合成片状氢氧化镁,生成的氢氧化镁颗粒直径为100~200nm。利用XRD和SEM对合成的氢氧化镁晶体的特性、颗粒大小和形貌进行了表征,同时对碱性条件下氧化镁的水化机理进行了讨论。 相似文献
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采用浓度为1∶1的盐酸浸取硼泥中的镁得到氯化镁溶液,以氢氧化钾为沉淀剂与氯化镁反应生成氢氧化镁,氢氧化镁经煅烧后制得氧化镁。研究了浸出温度、浸出时间、盐酸与硼泥比例对硼泥中镁浸出率的影响,通过DSC曲线确定了氢氧化镁的最佳煅烧温度,利用XRD和SEM对产物氧化镁进行了表征。结果表明,在浸出盐酸足量的条件下,反应温度对镁浸出率影响最大。硼泥中镁浸出的最佳工艺条件为:浸出温度85℃,浸出时间30min;盐酸体积与硼泥质量比4∶1。氢氧化镁在600℃下煅烧2.5h得到平均粒径小于100nm的氧化镁粉体。 相似文献
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《功能材料》2020,(2)
探讨了以轻烧镁粉和蒸馏水为原料,采用机械力化学法和水化法超细研磨制备六方片纳米氢氧化镁的工艺条件。研究了在氧化镁水化过程中,搅拌磨搅拌速率-研磨时间和料浆固液比对实验产品的粒度、形貌和结构的影响,并对反应机理进行了阐述。实验结果表明最优工艺参数为轻烧镁粉:蒸馏水:研磨介质配比为1∶4∶4、研磨转速为1300 r/min、反应最佳时长为180 min。在此条件下得到的产物为纳米级氢氧化镁,经测试其粒度d_(50)为1.04μm,d_(90)为2.27μm。SEM分析表明样品的表面形貌为六方片状,薄片厚度大约为5~20 nm;XRD分析表明制得的氢氧化镁粉体结晶完全,其平均晶粒尺寸为6.3 nm。 相似文献
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以苦卤和氨水为原料,硬脂酸镧为改性剂,采用常温一步直接沉淀法制备疏水性氢氧化镁纳米粒子;用扫描电子显微镜、傅里叶红外光谱、热重分析、X射线衍射、疏水性分析等手段对所得产物进行表征分析并进行疏水性测试。结果表明,在合成的过程中,硬脂酸镧通过化学反应改变了氢氧化镁的表面性质,改性后的Mg(OH)2为非极性,可漂浮在水面,表现为疏水性;硬脂酸镧并未改变Mg(OH)2的晶型,但是在X射线衍射中出现La(OH)3的杂质峰;硬脂酸根离子吸附在Mg(OH)2纳米粒子表面,使其表面有机化,同时提高了分散性和热稳定性。 相似文献
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Controlled reaction of magnesium with ethanol was found to produce morphological magnesium ethoxide. The scanning electron microscopy studies indicate that particles of magnesium ethoxide grow on the surface of magnesium granules and are detached from the surface as a result of shearing and collisions during the reaction. Particle characteristics of magnesium show influence on the kinetics of the reaction as well as morphological characteristics of magnesium ethoxide. Impact of other process parameter variations on the magnesium ethoxide particle characteristics is also studied. The reaction rate, agitation speed, and type of agitator show influence on the product characteristics, whereas no influence of change in reaction pressure is observed. 相似文献
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将硼-氮阻燃剂2,4,6-三(4-硼酸-2-噻吩)-1,3,5-三嗪(3TT-3BA)与Mg(OH)_2进行复配,然后将其添加到环氧树脂(EP)中,通过热重分析、锥形量热、极限氧指数、垂直燃烧等测试方法,研究了3TT-BA/Mg(OH)_2复配体系对EP的阻燃性能。研究发现,3TT-3BA与Mg(OH)_2具有协同阻燃作用,添加10%3TT-3BA/10%Mg(OH)_2到EP中,其极限氧指数达到了32.5%,垂直燃烧达到了UL94 V-0等级。同时,3TT-BA/Mg(OH)_2复配体系还能有效减小EP热释放速率、热释放总量和生烟总量。通过扫描电镜等手段探讨了3TT-BA/Mg(OH)_2复配体系的阻燃机理。 相似文献
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Al2O3/MgO composite powders were synthesized via a partially wet chemical method. The effects of precipitant agent on the morphology, size and chemical composition of the resultant powders were investigated. The structures of rod-like with polygonal prism surface, platelet-like and uniform spherical Mg-compound particles were successfully prepared by using ammonium hydrogen carbonate, sodium hydroxide and ammonia water as precipitant agents, respectively. Analysis results proved that using ammonium hydrogen carbonate as precipitant agent produced nesquehonite (MgCO3·3H2O) Mg-compounds but in the case of other two precipitant agents, Mg-compound particles with magnesium hydroxide (Mg(OH)2) chemical composition were obtained. The morphological features of MgO particles in Al2O3/MgO composite powders were the same as individual Mg-compound particles. Furthermore, conversion of the Al2O3/Mg-compound precursor synthesized with ammonia water to pure magnesium aluminate spinel particles was studied. The precursor converted to pure magnesium aluminate spinel phase with 220?nm particle size at 1200?°C. 相似文献