共查询到20条相似文献，搜索用时 640 毫秒
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对甘肃敦煌西土沟遗址7个地点的18个炉渣、9个矿石、27个金属颗粒共计54个样品进行了扫描电镜观测。认定大部分炉渣是氧化矿石直接冶炼红铜的,少量炉渣是冶炼含砷合金的;仅检测到含有少量硫化矿物的铜氧化矿石和绿松石;金属颗粒则具有红铜、砷铜、锡铜、锑铜(砷)、铅锡铜、锡铅铜(砷)、锡铅(铜)等多种成分组合。在一个炉渣样品中发现有砷酸钙,在一个金属颗粒中发现有砷氧化物。金属颗粒多次发现有银、铋、锑及锡氧化物。基于上述发现,对西土沟遗址的冶炼技术进行了推断,认为该遗址主要使用铜氧化矿石冶炼红铜,再配以含砷、锡等合金元素的矿料进一步冶炼获得各种合金。在第2地点与炉渣共出的木炭的碳十四年代测定结果为3470±35BP,Ox Cal v3.10校正为1890—1690BC(95.4%)。 相似文献
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锂离子二次电池用锡基负极材料具有高容量、低成本等优势,是目前高容量负极材料的研究热点之一。本文介绍了锂离子二次电池用锡基负极材料的特点及其储锂机理,综述了几种锡基材料的制备方法及性能,并讨论了它们的优缺点。 相似文献
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王文利 《深圳信息职业技术学院学报》2009,7(4):60-63
本文对电子产品无铅化后纯锡镀层使用带来的锡须问题进行了研究,重点分析了锡须形成的机理,锡须对电子产品可靠性的危害,提出了抑制锡须的措施,对预防锡须的形成、提高电子产品的可靠性具有参考意义。 相似文献
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制备盐酸甲氧氯普胺海藻酸钙凝胶微球并考察不同因素影响下的释药性.采用滴制法制备盐酸甲氧氯普胺海藻酸钙凝胶微球,海藻酸浓度为2%,氯化钙浓度为1%,载药微球在酸性环境中具有良好的缓释效果,缓释时间能持续8h.盐酸甲氧氯普胺海藻酸钙缓释凝胶微球具有良好的应用前景. 相似文献
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在以甲基磺酸锡为主盐、硫脲为电位调整剂的镀液体系中,在铜箔上制备了呈缎面光泽的均匀锡镀层.镀覆过程,用电偶电流法进行了分析;对所得镀层的显微组织结构,采用FE-SEM和XRD进行研究.结果表明,在该镀液体系中浸镀锡,镀覆过程迅速而平稳,所得锡镀层具有体心四方的晶体结构,镀层显微形貌为均匀分布的颗粒状形态. 相似文献
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湖南省茶陵邓阜仙钨、锡等多金属矿床及外围是湘东南成矿带北部的重要的成矿区,是近50年来找矿效果最好的区域,总结该区钨、锡等多金属矿床地质特征、成矿的一般规律,对指导该区进一步找矿具有重要意义． 相似文献
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刘雪华 《福建工程学院学报》2009,7(6)
以硫脲作为电位调整剂,以甲烷磺酸锡为主盐的酸性溶液作为镀液,采用浸镀法在铜基材上制备了锡镀层.采用场发射扫描电子显微术(FESEM)和X射线衍射(XRD)表征锡镀层的组织结构,根据数码相机微距照片进行宏观分析.研究表明.该镀液体系浸镀锡可以获得光滑而致密的浸锡层,无枝晶形成.该镀层主要相结构为体心四方的白锡.镀层的形成可分为锡晶粒的剧烈瞬间形核、平面层状生长和镀层致密化排列3个阶段. 相似文献
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何作庆 《蒙自师范高等专科学校学报》2008,6(1):6-9
本文从红河地方民族文化的视角出发,以云南红河彝族和个旧锡文化的关系研究为切入点,探讨了历史上锡文化在建筑门饰、铸造钱币和青铜器、近现代工业中的各种功用,红河彝族在土地资源、物资供应、劳动力、生态环境等方面对锡文化的贡献,提出了对锡文化发展的对策与建议。 相似文献
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In2O3 Ultrafine Powder Synthesis by Sol—Gel Method 总被引：1，自引：0，他引：1
The precursor of ultrafine In2O3 powder was prepared by the hydrolysis,peptization and gelation of InCl3.4H2O used as raw material.After calcination,ultrafine In2O3 powder was obtained.The particles were characterized by the methods of thermo-gravimetric and differential thermal analysis(TG-DTA),X-ray diffractometry(XRD) and transmission electron microscopy(TEM).respectively. 相似文献
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With InCl3·4H2O being used as raw materials, the precursor of nano-sized In2O3 powder was prepared by hydrolysis, peptization and gelation of InCl3·4H2O. After calcination, nano-sized In2O3 powder was obtained. The powder was characterized by thermo-gravimetric and differential thermal analysis (TG-DTA), X-ray
diffractometry (XRD) and transmission electron microscopy (TEM), respectively. Calculation revealed that the mean crystalline
size increased with increasing the calcination temperature, but crystal lattice distortion rate decreased with the increasing
in the average crystalline size. This indicated that the smaller the particle size, the bigger the crystal lattice distortion,
the worse the crystal growing. The activation energies for growth of nano-sized In2O3 were calculated to be 4.75 kJ·mol−1 at the calcination temperature up to 500°C; and 66.40 kJ·mol−1 at the calcination temperature over 600°C. TEM photos revealed that the addition of the chemical additive (OP-10) greatly
influenced the morphology and size of In2O3 particles. 相似文献
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在固相反应的基础上,采用草酸根沉淀稀土粒子使其充分混合的前处理方法,合成出一种新型的硼磷酸钇钆铕荧光红粉。对样品进行了X射线衍射、红外和荧光光谱表征。与(Y,Gd,Eu)PO_4相比,产物增加了与磷元素等摩尔量的硼。硼的掺入提高了发光强度,但没有改变样品的正磷酸盐单斜晶系结构。根据样品的红外光谱,发现其吸收峰与GdPO_4的很相近,说明样品与GdPO_4同构;同时分析了不同浓度Gd~(3+)掺杂对样品发光强度的影响以及基质离子对Eu~(3+)的能量传递机理。通过对产物的分析发现其具有高的发光亮度及低的热猝灭效应,可作为一种优良的稀土三基色发光材料。最后将本实验所用方法与传统固相法对比,反应温度降低了100℃,发光强度提高了10%以上,且所得样品易粉碎、粒径小。 相似文献
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王立梅 《实验室研究与探索》2011,30(11)
TiC增强涂层以钛铁粉、铁粉、铬粉和碳的前驱体(蔗糖)等为原料,通过前驱体碳化复合技术制备了Fe-Cr-Ti-C等离子熔覆复合粉末,并通过等离子熔覆技术在Q235钢表面成功原位合成.采用SEM、XRD和EDS对涂层的相组成和显微组织结构进行了分析,并在室温干滑动磨损条件下测试了该涂层的耐磨性能.结果表明,等离子熔覆涂层由原位合成的TiC相和(Cr,Fe)7C3共晶相与奥氏体相构成,与基材完全冶金结合.涂层中碳化物TiC呈现梯度分布,并且涂层的熔合区和中部区域TiC颗粒形状大多呈现粒状,涂层的表层区域部分TiC颗粒呈现树枝状.涂层的硬度从表面到熔合区相差不大,平均显微硬度约是HV02750,是基体金属的3.2倍.涂层磨损质量约是基体金属的1/12,具有良好的耐磨性能. 相似文献
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以电合成前驱体Ti(OEt)4直接水解法和电沉积法制备Ti基纳米TiO2-碳纳米管复合膜载P(tPt/nanoTiO2-CNT)复合电极。透射电镜(TEM)和X射线衍射(XRD)测试表明,锐钛矿型纳米TiO2粒子和Pt纳米粒子(粒径约8nm)均匀地分散在碳纳米管表面。通过循环伏安法研究Pt/nanoTiO2-CNT电极对Ce3+的电催化性能,Ce3+氧化峰电位约为1.27V(vs.SCE),比Pt/nanoTiO2电极负移30mV,峰电流约高45mA·cm-2。 相似文献
18.
单模微波水热控制合成纳米硫化铜 总被引：1，自引：0，他引：1
以硝酸铜,生物小分子L-半胱氨酸为原料,在室温下生成前驱体,然后采用单模微波水热法在150℃下反应1h,制备出纳米硫化铜,考察了硝酸铜与L-半胱氨酸的物质的量比对产物形貌的影响。采用XRD和TEM对产物的结构和形貌进行了表征。结果表明,当二者物质的量的比为1：1时反应得到的纳米晶硫化铜为球形,其粒径均匀。 相似文献
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Hydrogen dielectric-barrier discharge (H2-DBD) plasma was successfully used to prepare carbon nanotubes (CNTs)-supported cobalt (Co) catalyst. The H2-DBD plasma treatment simultaneously decomposed and reduced the cobalt precursor at a lower temperature and in a shorter time than the conventional method (calcination and hydrogen reduction). It is considered that the H2-DBD plasma method can remarkably decrease the amount of energy input compared to traditional methods used to prepare the Co-based catalyst in Fischer–Tropsch synthesis (FTS). Results showed that the Co catalyst prepared by H2-DBD plasma had an equivalent catalytic performance for FTS as that prepared using the conventional method in calcination and hydrogen reduction, thereby determining that H2-DBD plasma was an effective alternative treatment for preparing the Co/CNTs catalyst for FTS. This technology will provide a new strategy for preparing catalysts in other catalysis processes. 相似文献
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Well-cubic perovskite lanthanum aluminate (LaAlO3) film on (110) silicon substrate was fabricated by sol-gel method with corresponding inorganic salts. Lanthanum acetate and aluminum acetate glacial acetic acid solutions were prepared via ligand exchange starting from lanthanum nitrate hexahydrate and aluminum nitrate hexahydrate after being refluxed. (CH3CO)2O removed nitrates and the crystallized H2O completely, acetylacetone (AcAc) was partially bidentated with metallic ion of the metallic acetates and formed La(OAc)3(x(AcAc)x, which were hydrolyzed into La(AcAc)3(x(OH)x by adding 10 ml 0.4% methyl cellulose (MCL) solution. The La(AcAc)3(x(OH)x, polymerizing and combining with MCL, formed the LaAlO3 sol precursor with heteropolymeric structure and formed film easily. The epitaxial LaAlO3 film on Si(110) substrate was crystallized after being annealed in thermal annealing furnace for 650(750 (C/30 min. The morphologies and microstructures were characterized. The refractive index of the LAO film was 1.942 to 2.007; the dielectric constant and the dissipation factors were estimated to be 23(26 and 2.1(10(4 ( 2.4(10(4 respectively. 相似文献