铁纳米线阵列组织结构对其吸波性能的影响

利用阳极氧化铝膜模板组装磁性铁纳米线阵列,具有优异的宽频微波吸收性能。制备不同组织结构的铁纳米线阵列,通过数码相机、场发射扫描电镜及微波吸收测试等手段,分析研究了铁纳米线阵列组织结构对其吸波性能的影响。结果表明:对铝基板进行表面喷砂处理,可以获得取向各异的金属铁纳米线,纳米线垂直于氧化膜表面生长;铁纳米线的取向各异使得其微波吸收性能有很大改善;在4～18GHz频带范围内微波吸收率提高,且吸波频带展宽。     

硫酸浓度对多孔氧化铝膜的影响

在H2SO4电解液中对高纯铝箔进行阳极氧化,考察分析了电解液浓度对多孔阳极氧化铝膜的影响,结果表明:随硫酸电解液浓度的增加,纳米孔孔径逐渐增大,孔密度降低,孔的有序性先提高后降低;采用23 V直流电压进行阳极氧化,电解液浓度为0.6~1.0 mol/L时制得的氧化铝膜孔径均匀性及有序度均较好,尤其以0.8 mol/L H2SO4最佳;阳极氧化铝膜的厚度随电解液浓度的提高而增大;电解液浓度过高易于将铝箔快速击穿。     

热浸铝材料表面电化学氧化工艺研究

镀铝钢因具有优良的性能已经在国民经济多种领域中得到广泛应用。为了提高镀铝层的耐腐蚀性能,本文重点研究了采取硫酸阳极氧化工艺获得铝的氧化膜工艺条件,考察了硫酸浓度对铝氧化膜形成及其耐蚀性能的影响,通过氧化膜SEM形貌观察,氧化膜XRD分析,极化曲线测量,电化学交流阻抗分析等氧化膜电化学腐蚀研究方法,确定了热浸镀铝层硫酸阳极氧化最佳工艺参数。     

铝对HP40合金高温抗氧化性能的影响

 采用增重法研究了w(Al)=5%~10%的HP40合金在1 200 ℃×30 h空气中的抗氧化性能。结果表明，铝可显著提高合金的高温抗氧化性能，而且合金的高温抗氧化性能随铝含量增加而提高。1 200 ℃时，合金氧化增重与氧化时间的关系呈抛物线规律，氧化速率随氧化时间延长而逐渐下降。加入铝，改变了合金氧化膜层的物相组成和致密度，含铝合金的氧化层中含有Al2O3，而且Al2O3量随铝加入量增加而增多。     

纳米级多孔氧化铝膜的制备

首先选用磷酸和丙三醇对铝基片进行电化学抛光,之后以草酸为电解液,利用电化学阳极氧化法制备多孔有序阳极氧化铝阵列模板,用高倍扫描电镜对其形貌进行表征．研究了电解电流、电解液浓度、温度等条件对氧化铝膜结构的影响．结果表明：用丙三醇与磷酸（体积比为9：1）作为电化学抛光液对铝基片进行抛光,抛光效果明显,铝基片的表面洁净;说明了电流、浓度、温度等对氧化铝膜的影响．     

阳极氧化工艺对冷热循环冲击后2A12铝合金耐腐蚀性能的影响

利用扫描电镜、裂纹密度测试以及电化学工作站研究了不同的阳极氧化工艺对冷热循环冲击之后2A12铝合金耐腐蚀性能的影响.结果表明:阳极氧化时间越长或电解液浓度越高,冷热循环冲击之后膜层表面的开裂现象越严重,氧化膜的耐腐蚀性能变差.当阳极氧化电压过低时,虽然冷热循环冲击之后膜层表面无裂纹产生,但所制备的阳极氧化膜偏薄,达不到...     

8407钢渗铝氧化处理形成的氧化膜组织与结构

对渗铝后的8407钢试样进行常温硬质阳极氧化处理,使其表面形成氧化膜。通过金相显微镜观察氧化膜横截面组织,并探讨了氧化膜的形成机制;采用扫描电镜观察氧化膜表面形貌,并检测氧化膜沿厚度方向的化学成分及其分布;利用X射线衍射仪对氧化膜相组成进行分析。结果表明,渗铝8407钢经过常温硬质阳极氧化后,试样表面分为3层,从基体向外侧依次为基体、渗层、氧化膜。氧化膜连续致密,厚度均匀,与基体结合紧密,其主要成分为O、Al和Fe,且各元素分布均匀,主要相组成为Fe3O4和Al2O3。     

稀土铝合金在草酸溶液中的阳极氧化及膜层性能的研究

在草酸溶液中对添加稀土的工业纯铝进行了阳极氧化,较系统地研究了电流密度、电解液浓度、温度、合金成份对氧化膜厚度的影响,并对膜层的物理性能、耐蚀性能进行了研究。结果表明:添加稀士后生成的氧化膜厚,膜层分布均匀、致密且具有较好的物理性能和耐腐蚀性能等,稀土铝合金中的稀土含量以0.20～0.29wt％为宜。     

导电浆料用铜粉的表面改性及其性能

将铜粉在甲醇-油酸混合溶液中进行油酸预包覆,然后以异丙醇为分散介质、TEOS和A酸为原料,采用溶胶-凝胶法对油酸预包覆的铜粉进行S iO2-A1系薄膜的包覆.对改性后铜粉的膜层进行了微观分析,对改性铜粉的高温抗氧化性能、烧结性能和导电性能进行了研究,并探讨了正硅酸乙脂、A酸、水、氨水用量和反应温度对其高温抗氧化性能的影响.研究结果表明:采用该法可在铜粉表面包覆一层连续的S iO2-A1系薄膜,包覆的S iO2、A1膜能显著降低其烧结温度。升高温度、增加TEOS用量以及加入微量的A酸均能明显地提高铜粉的高温抗氧化性。在试剂摩尔比为n(TEOS)∶n(A)∶n(Cu)=0.0455∶0.0227∶1,n(H2O)∶n(NH3)∶n(TEOS+A)=25∶7∶1,温度为70℃的条件下改性的铜粉开始氧化的温度为310℃,和铜粉原样相比提高了110℃。铜粉原料按一定的配方制成导电薄膜后,其电阻率为2.12×10-4Ω.cm,而该改性铜粉按照同样配方制成的导电薄膜的电阻率为6.25×10-4Ω.cm,这保证了它在用于MLCC端电极材料时仍具有良好的导电性.     

铝工业生产节能途径

本文分析了氧化铝厂和电解铝厂的能耗情况。对氧化铝厂提出了提高溶出温度、取消脱硅工序、利用种分精液加热种分母液、采用二段闪蒸流程、实现窑外分解和回转窑焙烧改为流态焙烧等节能技术措施,预计的节能效果为3×10~6kcal/t氧化铝;对电解铝厂提出了降低铝电解槽电压降、改进阴极和阳极质量及其结构,应用电子计算机控制电解生产过程,以及对电解铝厂进行技术改造等节能措施。     

Chinalco Signed Framework Agreement for Strategic Cooperation with Harbin Municipal Government

正Last month,Chinalco signed framework agreement for strategic cooperation with Harbin Municipal Government in Harbin Xiong Weiping,Chairman of Chinalco,said that based on the strategic deployment to build world top-class mining company with the highest growth potential,Chinalco was now concentrating all efforts on making strategic transition and structural adjustment,strategic cooperation with the local governments where     

Jiangxi Promotes Jiangxi Copper Corporation To Become The World's Most Competitive Mining Company

<正>According to the latest info from Jiangxi Province State-owned Assets Supervision and Administration Commission,Jiangxi Copper Corporation was approved to become the first pilot enterprise for deepening reform.Contents of the pilot work is"Three Self"(self expansion,self decision-making,self     

Journal of Rare Earths Contents List of Vol.32(2014)

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Contributions to Baosteel Technical Research wanted

正Baosteel Technical Research,a quarterly journal,which is issued domestically and abroad,is run and sponsored by Baosteel Group Corporation.Baosteel Technical Research mainly reports the achievements in technological innovation,academic research,new product development and industrial equipment improvement by Baosteel.It will continue to follow up on hot topics and serve the company’s technological development and progress.Its readers include experts in     

Ministry of Industry and Information Technology: No Short Term Solution For Our Country’s Excess Nonferrous Metal Smelting Capacity

【正】According to the Ministry of Industry and Information Technology,the Ministry has released the 2013 Operation Report on China’s Industrial Communication Indu...     

Chinalco Signed Framework Agreement for Strategic Cooperation with Gansu Province

正Recently,Chinalco and Gansu Provincial People’s Government signed"Framework Agreement for Strategic Cooperation on Reform,Restructuring and Transition Development of Chinalco’s Electrolytic Aluminum Enterprises in Gansu",signifying that the strategic cooperation between Chinalco and Gansu Province had made new substantive progress.     

Unavoidable Economic Cycle:30% Of Nonferrous Metal Companies Were Involved In Restructuring

正Owing to continual downturn in real estate and bulk commodity markets,a number of traditional industries in China suffered unfavorable impact in performance.With the progressive disclosure of third quarter report,the no-pleasant-surprise performance of     

Baotou Rare Earth Became the World's Biggest High Performance Magnetic Material Base

正The High Performance Magnetic Material Phase II Project,an industry upgrading project implemented by Inner Mongolia Baotou IronSteel Rare Earth(Group)Hi-tech Co.,Ltd,recently basically finished equipment commissioning,signifying that the enterprise had developed the production capacity of15000 t/a Nd-Fe-B strip casting alloy and 5000t/a Nd-Fe-B magnet,thus becoming the world’s     

Introducing Two Central Enterprises to Integrate Rare Earth Industry,Shandong Rare Earth Group Breaks Surface

正With the signing of"Letter of intention for Propelling Integration of Shandong Rare Earth Enterprises"between Shandong Province Commission Of Economy and Informatization,China IronSteel Research Institute Group("China Steel Institute"),and China Rare MetalsRare Earth Co.,Ltd("China Rare Earth"),the"Shandong Rare Earth Group"jointly set up by the 3 units thus broke surface.On August 9,reporters of the China Economic Herald learned from Shandong Province     

Aluminium Production by Province or City in 2014

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