用俄歇电子能谱(AES)研究InGaAsP/InP异质结界面

AES是近十年来发展起来的一种固体表面分析方法,它的基本原理是:样品表面受到电子束轰击时,轰击点附近一定深度范围的部分原子电离;部分电离原子发生俄歇过程而发射具有特征能量的俄歇电子,被能量分析器所接收。根据俄歇电子的能量值,可     

LaNi4.7Al0.3储氢合金氧化前后吸放氢性能研究

研究了LaNi4.7Al0.3贮氢合金被微量氧气毒化前后贮氢性能的变化，测定了合金的贮氢量，吸氢动力学曲线.并采用扫描俄歇电子能谱(AES)原位研究了LaNi4.7Al0.3储氢合金中毒前后化学成分变化，结果表明：氧含量较低时，不会影响合金的初始吸氢速率，但会降低合金的贮氢容量；随着O2的剂量的逐渐增大，合金的吸氢速率变慢，合金的储氢容量大大降低。原位分析氧毒化LaNi4.7Al0.3贮氧合金表明，O2在清洁LaNi4.7Al0.3表面吸附离解后，优先与表面镧原子结合生成La的氧化物，再与部分表面镍原子结合生成Ni的氧化物氧化过程中La向表面富集，同时有金属态的Ni析出.     

铁 铬 铝合金中铬的第三组元作用

 研究了Fe 10Al、Fe 5Cr 10Al和Fe 10Cr 10Al合金在1 000 ℃的氧化行为，利用电子显微镜和俄歇电子谱分析了合金表面氧化膜的形貌及组成。讨论了三元Fe Cr Al合金形成保护性氧化膜的机理，对于不发生铝的内氧化情况提出了合金中第三组元铬的作用机制：在氧化初始阶段，铬与合金中其它两组元——铁和铝一起氧化形成各自的氧化物，铬在氧化膜内最大含量的位置处于铁和铝的最大含量位置之间；铬降低了氧化膜内的铁含量，提高了初期氧化膜的保护性，从而促进选择性氧化铝膜的形成。     

Fe-Al和Fe-Cr-Al合金在高温下的初期氧化

研究了Fe-10Al、Fe-5Cr-10Al和Fe-10Cr-10Al分别在900℃和1 000℃的初期氧化行为.利用电子显微镜(SEM)和俄歇电子谱(AES)分析了合金表面形成氧化膜的形貌与组成.Fe-Cr-Al实现铝的选择性氧化所需的时间取决于合金中铝和铬的质量分数,同时也与氧化温度有关,较高的反应温度能促进铝的选择性氧化.Fe-10Cr-10Al比Fe-5Cr-10Al更快地实现铝的选择性氧化,而Fe-5Cr-10Al在1 000℃比在900℃更快实现铝的选择性氧化.     

表面分析技术新进展

拉夫巴勒咨询公司宣称 X 射线光电子谱仪(ESCA)和俄歇扫描显微探针联合装置将促进工业方面表面分析的发展。ESCA 和俄歇电子分光计这两种仪器具有综合性的效能,能解决各种材料的表面和界面问题。这些设备的优点是它们能够确定最上面几个原子层的化学成分。在化学反应、吸     

固体表面高精度分析装置

日本科学技术厅无机材料研究所已研究成功一种高分辨率的电能损耗分光装置EELS。该装置同俄歇电子能谱仪及红外吸收仪一样,也是固体表面分析的有力手段。该装置的原理概要如下:在向固体表面照射低能电子束时,一些电子很容易散射在固体的表面原子上而失去能量。也就是说,这些照射电子的一部分能量已转换成固体表     

真空蒸发镀膜法制备金属铈薄膜的表征

采用真空蒸发镀膜法在不锈钢基体上制备金属铈薄膜,利用扫描电子显微镜(SEM)和X射线衍射仪(XRD)研究铈薄膜的形貌和物相结构,通过俄歇电子能谱仪(AES)和X射线光电子能谱仪(XPS)测量元素形态及膜层深度。分析结果表明:金属铈薄膜表面致密,与不锈钢基体紧密结合,膜层的厚度约为24μm;金属铈薄膜的表面已经被氧化,氧化膜的厚度约为340 nm,其成分主要由CeO_2组成,也含有少量的Ce_2O_3。     

氮离子注入Ti-6AI-4V合金的力学性能

德国俄斯伯格(Augsburg)大学物理研究所的研究人员利用俄歇电子光谱法、卢瑟福反向散射光谱测定法、扫描电子显微镜,能量散射X射线分析、激光扫描聚焦显微镜等各种分析技术,研究了用高能量氮离子和通量为10~(16)离子/cm~2、10~(18)离子/cm~2的离子注入Ti-6Al-4V合金的表面形态,化学成分、离子注入层深度和力学性能,RauschenbachB.研究者对25mm×25mm×1mm Ti-6Al-     

Ti-6Al-4V/σ-SiC纤维复合材界面扩散层研究

目前用于长纤维增强复合材的SiC有两种:一种是美国航空公司(AVCO)制造的,称之为SCSi(i=2,6,8,9)长纤维,另一种是英国BP公司制造的,称之为SM1240和SM1140的长纤维.研究采用SM1240长纤维,即具有钨芯和涂有碳(1.42μm厚)和TiBx(0.65μm厚)双重涂层的SiC纤维,与80～100μm厚的Ti—6Al—4V箔材在1173K下热等静压制得复合材.利用扫描电镜(SEM),透射电镜(TEM),透射电子能耗谱(EELS)以及俄歇电子谱(AES)和扫描俄歇电子显微镜(SAM)等方法,观察分析复合材界面扩散层的组织结构及元素分布等.     

用零价铁从含铀溶液中去除铀的试验研究

研究了用零价铁从模拟含铀溶液中去除铀,考察了几种因素对除铀的影响,探讨了除铀反应机制。试验结果表明:用零价铁去除溶液中的铀在技术上是可行的,在零价铁足够多且维持适宜还原性条件下,大部分UO2+2在零价铁表面还原沉淀为难以再溶解迁移的UO2,少量UO2+2吸附或共沉淀到零价铁溶蚀产物上;零价铁粒径为0.28~2.5mm、溶液pH3条件下,铀的还原沉淀容易发生。     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.