有机海泡石/环氧树脂复合材料的研究

以环氧树脂为基体,酚醛胺(T31)为固化剂,有机改性后的海泡石为增强剂,制备了有机海泡石/环氧树脂复合材料.通过X射线衍射(XRD)分析、傅里叶变换红外(FTIR)分析、热重分析(TG)、拉伸试验研究了复合材料的结构、力学性能、耐热性能.结果表明,环氧树脂可插层进入有机海泡石中;随着有机海泡石加入量的增加,环氧树脂的力学性能和耐热性能逐渐增强,有机海泡石含量为1％时,其拉伸剪切强度比纯环氧树脂提高了69.5％;有机海泡石含量为2％时,热分解温度提高了31℃.     

云南胶磷矿正浮选捕收剂合成与浮选机理研究

通过三乙醇胺对油酸进行酯化改性,获得油酸酯化改性捕收剂,经红外光谱分析表明,具有明显特征吸收峰。通过浮选机理研究,在试验用量范围内,胶磷矿纯矿物与改性捕收剂作用后接触角可达87.23°(此时上浮回收率达97.87%)；油酸改性捕收剂引入亲水基团,CMC提高19.58倍,在水中溶解性增加；同时改性后的捕收剂分子截面积由7.27 ?²增大至9.51 ?²,分子截面积提高了30.81%。药剂作用机理的研究,对与纯矿物来自同一矿山的低品位磷矿石浮选具有较强理论指导意义。     

环氧树脂/改性硅藻土复合材料性能实验研究

改性硅藻土与环氧树脂复合,加入固化剂,制得环氧树脂/硅藻土复合材料。测试了环氧树脂/硅藻土复合材料的固化性能及粘接性能。结果表明,硅藻土添加量为环氧树脂质量的6%时,固化过程的热焓最大,9%时复合材料的耐热性最好,1%时复合材料的拉伸剪切强度提高最多,但添加硅藻土对固化温度的影响不大。     

Cu含量对T6及T8态时效超高强铝锂合金时效析出相和强度的不同影响

采用透射电子显微镜和室温拉伸性能测试,研究了Cu含量对Mg、Ag、Zn复合微合金化的新型超高强铝锂合金Al-xCu-1.2Li-X（x=4.2、4.5）冷轧薄板的时效析出相和强度的影响。结果表明：T6（165 ℃/24 h）及T8态时效时,不同Cu含量的超高强铝锂合金的析出相包括大量的T₁相、较多的θ′相、部分GP区和δ′/GP/δ′复合相以及少量的S′相;T6态时效时,高Cu含量更有利于合金中GP区及θ′相的析出而导致T₁相的数密度减少,因而强度较低、伸长率相对较高;T8时效时,高Cu含量则有利于T₁相和θ′相的同时析出,导致其数密度大幅度增加,同时S′相和GP区的析出受到抑制,因此随着Cu含量增加,合金强度增加、伸长率小幅度下降;T8态时效后,高Cu含量新型超高强铝锂合金的抗拉强度达661.7 MPa、伸长率约为6%。     

ZIF-8衍生柔性多孔炭材料的制备及其电容性能研究

随着柔性可穿戴电子器件的迅速发展,柔性储能电极材料引起众多学者们的广泛关注。金属有机框架结构（MOFs）衍生物具有优异的储能性能,但其本征无柔性的物理特性亟需解决。采用静电纺丝技术将ZIF-8结构单元嵌入纤维结构中,获得高电容性能柔性多孔炭纤维。同时,探究了ZIF-8的嵌入量（CF-ZIF-8-1.2）对柔性多孔炭纤维结构及电容性能的影响。实验结果表明：柔性多孔炭纤维CF-ZIF-8-1.2的比电容可以达到425.5 F?g^-1（电流密度为1 A?g^-1）,并呈现出较小的电荷转移电阻（R_s=0.06 Ω）和接触电阻（R_ct=2.31 Ω）,这主要归因于CF-ZIF-8-1.2具有较大的比表面积（212.83 m²?g^-1）、相对丰富的孔隙结构和丰富的N和O原子共掺杂。随后,进一步将其组装成对称柔性超级电容器（CF-ZIF-8-1.2//CF-ZIF-8-1.2）,其能量密度高达7.6 Wh?kg^-1（功率密度为250 W?kg^-1）,在不同弯曲角度和扭曲下呈现出优异的电容保持率（97%以上）,说明柔性多孔炭纤维电极材料具有优异的柔性和稳定性。因此,CF-ZIF-8-1.2柔性多孔炭纤维材料具有潜在应用前景。     

应变速率对马氏体相变非晶复合材料力学行为的影响

金属玻璃具有较高的硬度、高断裂强度和良好的耐腐蚀性能,但室温塑性较差而限制了广泛应用,因此在金属玻璃中引入晶体以提升金属玻璃的力学性能。通过分子动力学模拟研究非晶/晶体双相复合材料,有助于深入理解非晶/晶体双相复合材料的性能和变形机制。采用分子动力学模拟方法研究了不同应变速率对金属玻璃复合材料力学性能的影响,同时在300 K环境温度下对块状B2-CuZr晶体/Cu₅₀Zr₅₀非晶复合材料进行压缩实验。结果表明：随着压缩应变速率增加材料的整体强度提高,与应变速率为2×10⁸s^-1和2×10⁹ s^-1的样品相比,压缩应变速率为2×10¹⁰ s^-1时样品的屈服强度最高达7.8 GPa;随着压缩速率的增加,材料中晶体原子发生相变的数量也增多,样品中块状晶体没有发生明显的偏转,剪切带扩展路径受到阻碍;样品应力应变曲线上出现独特的二次硬化曲线,与另外两种应变速率下样品相比,压缩应变速率为2×10¹⁰ s^-1时样品的强度和塑性均有增加。该研究结果对于设计和制备高性能的金属玻璃材料有参考价值。     

亚氧化钛块体电极的电化学特性及其对几种工业有机废水的降解效能研究

亚氧化钛电极Ti_nO_2n-1(4≤n≤10) 具有环境友好、导电性好、耐强酸强碱、析氧电位高等优异性能,在电催化氧化处理难降解有机废水领域中极具应用潜力。采用自制的亚氧化钛块体电极,研究该电极的电化学特性及其对多种难降解工业有机废水的降解效能,并表征该电极的组成和表面形貌。结果表明：该块体电极为表面多孔结构,电极表层的主相为Ti₄O₇,电极的粗糙系数约为500,能为电化学反应提供较大的活性比表面积;同时,其电化学电位稳定窗口可高达3.6 V,电化学交换电流密度为4.606×10^-2 mA?cm^-2,均高于DSA电极（2.3 V和1.861×10^-2 mA?cm^-2）;此外,该块体电极及DSA电极的电化学氧化降解亚甲基蓝（MB）的过程均符合准一级反应动力学方程,且反应动力学常数k_亚氧化钛=2.0 k_DSA。利用亚氧化钛块体电极对多种工业废水,如垃圾渗滤液、金属冶炼厂的残余液等样本进行了降解处理,上述废液的化学需氧量（COD_Cr）去除率均能达到90%以上,表明该电极装置能有效地处理难降解工业废水。     

硅锰渣人造骨料的制备工艺及性能研究

硅锰渣是铁合金产业的工业废渣之一。本研究采用冷黏结法制备硅锰渣人造骨料,通过探究造粒机倾角、频率和成球时间对硅锰渣骨料性能及粒径分布的影响,确定出最佳造粒工艺条件倾角为50°、频率为15 Hz和成球时间为70 min,在此基础上研究了固体和液体碱激发剂加入量、养护温度和两种硅锰渣类型(TYGM、BLGM)对骨料性能的影响,采用抗压强度试验机测试骨料单球和筒压强度,并按照其它标准测试骨料的堆积密度、颗粒密度和吸水率。结果表明,当液体激发剂、固体激发剂加入量分别为16.2%、20%,养护温度为室温时,制备出的骨料性能最优,其堆积密度分别为1397.5、1422.7 kg/m3^,7 d吸水率分别为5.3%、5.4%,7 d筒压强度分别为17.6、8.9 MPa。由TYGM制备的骨料单球强度优于BLGM,TYGM在112 d时骨料强度达到最大为18.88 MPa,而BLGM在119 d时骨料强度达到最大为13.31 MPa。     

一种新型超高强铝锂合金的力学性能与微观组织演化

铝锂合金作为一种轻质高强的结构材料,广泛应用于航空航天制造领域。为进一步提高铝锂合金强度,制备了一种含Cu为4.68%（质量分数）、Li为1.36%（质量分数）的Mg+Ag+Zn多元微合金化的新型超高强铝锂合金,并且系统地研究了该合金冷轧薄板（厚2 mm）的T6时效态（170 ℃）及T8时效态（4%预变形/150 ℃）的微观组织和力学性能。研究结果表明：该新型超高强铝锂合金,其T6时效态抗拉强度最高达637 MPa、T8时效态抗拉强度最高达685 MPa,强度达到峰值后伸长率随时效时间的继续延长从8%缓慢下降;该合金主要强化相为T1相（Al₂CuLi）和θ′相（Al₂Cu）,T8时效态加速了T1相析出,从而加快了时效响应速度,同时增加了T1相数密度,提高了合金强度。说明,通过调整铝锂合金的时效状态可影响强化相总量及各析出相体积分数,从而获得更高强度的铝锂合金。     

改性煤系高岭土对丁苯橡胶性能补强研究

本试验主要研究煤系高岭土有机改性及其对橡胶的补强性能。将经过表面改性的煤系高岭土部分替代白炭黑填充到丁苯橡胶(SBR)基体中,利用熔融共混法制备出改性高岭土/SBR复合材料,并进行硫化性能及力学性能分析。结果表明,改性煤系高岭土的替代量为60%时,t10(焦烧时间)和t90(正硫化时间)达到最小值,300%定伸应力达到8.0 MPa,拉伸强度达到20.0 MPa,撕裂强度达到60 kN/m,SBR复合材料的硫化加工性能与力学性能均明显改善。     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

2014 second batch of rare earth quota released

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矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586