Morphology control of needle-like magnesium hydroxide nanoparticles;
针状纳米氢氧化镁的形貌控制
Production and application of needle-like nano-CaCO_3;
针状纳米级碳酸钙的工业生产与应用
Production of needle-like nano-CaCO_3 by non-refrigerating carbonization;
非冷冻碳化法工业化生产针状纳米碳酸钙
A new type of needle α-Fe2O3 coated titania composite particles were prepared via the colloidal method and characterized by XRD,TEM,and EDS methods respectively.
采用溶胶法制备了针状α-Fe2O3包覆二氧化钛的复合纳米颗粒,并通过透射电镜(TEM)、X射线衍射(XRD)、能谱元素分析(EDS)对产物形貌和晶相组成进行了表征,对其形成机理进行了初步分析。
Experimental results showed that: the period of reaction was greatly shorted under microwave radiaton ; beside , while the molar ratio of FeCl_3 and NaH_2PO_4 were 200 and 250 , we obtained uniform spheral and acicular nanometer particles respectively ; The diameter of particles were about 20nm .
采用微波辅助法由FeCl3溶液在晶体助长剂NaH2PO4的存在下制备出了针状和球状的α-Fe2O3纳米粒子。
Acicular barium ferrite, which was prepared by topotactic reaction between barium carbonate, aciculargoethite with the aspect ratio of 14 and the average length of 500nm and some doping ions, were characterized byXRD, TEM and TG-DTA.
采用α-FeOOH(平均长度为50nm,平均轴比为14)和BaCO_3 及添加离子经局部规整反应制备针状钡铁氧体。
By observing microstructures , we find they may form spheroidal A,acicular A and feathery A .
组织观察发现,除形成球状A、针状A外,还形成羽毛状A。
The optimum conditions of preparing needle like nano CaCO 3 were discussed, which were concent.
采用鼓泡碳化法 ,以无机酸A为添加剂 ,通过对反应温度、反应物浓度、气体流量和气体分布板孔径大小等各影响因素的控制 ,得到制备针状纳米碳酸钙的优化工艺条件 ,最终制得了平均粒径为 2 0nm ,长径比约为 18,且分散性能良好的纳米碳酸钙 ,并用TEM和XRD对产物粒子进行了表征。
Ultra fine needle like calcium carbonate particles were successfully synthesized by high gravity reactive precipitation in a rotating packed bed (RPB).
采用超重力反应结晶法 ,在旋转填充床 (RPB)反应器中 ,以Ca(OH) 2 /CO2 为反应物系 ,MgCl2 作为晶形控制剂 ,在较短时间 (约 1h)内合成出了平均短轴为 80～ 2 0 0nm、长径比为 12～ 2 0且短轴及长径比分布较窄的微细针状碳酸钙 ;利用TEM、电子衍射、XRD、TG DTA等手段对产品进行了表征。
This paper presents the production status in quo of asphalt needle coke,analyses and compares the existing production process and products,putting forth improvement measures on domestic needle coke production, which will have directing significance for the construction of 300,000-t cooke tar project in Laiwu Steel Group.
介绍了国内外沥青针状焦的生产现状,并对现有的生产工艺和产品进行分析对比。
The composite material prepared by the needle coke coated phenol formaldhyde resin was used as cathode for lithium ion battery.
以针状焦作为核心,外层包覆酚醛树脂的复合材料作为锂离子电池的负极材料,通过对比不同包覆量的复合材料的表面形貌、结构及其电化学性能的研究,得出结论:树脂对于针状焦具有较好的包覆作用,有利于锂离子的嵌入/脱出,改善了电化学性能。
For the sake of getting needle coke from oil,carbonization behavior of aromatics-rich fraction in catalytic cracking slurry(FCCRF)and the co-carbonization behavior of FCCRF with ethylene tar were studied by means of FTIR,1H NMR and polarized light microscopy.
5MPa、400～420℃下炭化17～20h,可得到广域流线型结构的中间相沥青,进而可制备出针状焦。
Element Mo, Cu were added into grey iron liquid, the type and content of inoculants, pouring time, cooling time, shake out time were adjusted to get acicular structure.
通过向灰铸铁中加入一定量的Mo、Cu等合金元素,并调整孕育剂的类型及其在铁液中的含量,同时调整浇注温度、冷却时间、落砂时间等工艺措施来控制针状组织铸铁的生成。
The results show that some defects such as metallic inclusion,unmerited heat treatment process and so on,conduce the existence of bulky acicular silicon and herringbone(α+Si) two-phase eutectic structure,which reduces the mechanical properties.
结果表明,轮辋材质成分夹杂、热处理工艺不当等缺陷造成组织中存在大量的粗针状硅和鱼骨状(α+Si)两相共晶组织,该组织降低其力学性能是造成轮辋脆性断裂失效的主要原因。