焦耳处理对Fe73．5CulNb3Sil3．5B9合金丝巨磁阻抗效应影响的研究

研究了焦耳处理对Fe73.5Cu1Nb3Si13.5B9非晶丝巨磁阻抗(GMI)效应的影响. 结果表明, Fe73.5Cu1Nb13.5Si3B9非晶丝的GMI效应对处理工艺很敏感, 淬态样品在340 Mpa拉应力下, 经53 A·mm-2的直流电流处理后, 其阻抗相对变化率达到68%, 灵敏度达0.86%/A·m-1. 优异的软磁性能和环型各向异性是获得巨磁阻抗效应的关键因素.     

焦耳处理和等温退火对Fe_(73.5)Cu_1Nb_3Si_(13.5)B_9非晶丝巨应力阻抗效应的影响

研究了焦耳退火和等温退火对Fe73.5Cu1 Nb3Si1 3.5B9非晶丝巨应力阻抗效应的影响。实验结果表明 ,非晶合金丝经电流密度为2 6A·mm- 2 的焦耳处理后 ,其阻抗最大变化率达到 2 5 % ,灵敏度为 1 71%·MPa- 1 ;淬态样品在 5 80℃等温退火 0 5h后 ,其阻抗最大变化率达到 67% ,灵敏度为 0 85 %·MPa- 1 。这两种退火方法都可以明显改善Fe73.5Cu1 Nb3Si1 3.5B9非晶合金丝的巨应力阻抗效应 ,阻抗的最大变化率与退火过程中晶化导致的平均各向异性的改变有关 ,而灵敏度的差异是由退火方法导致材料机械性能的差异带来的     

焦耳处理和等温退火对Fe73.5Cu1Nb3Si13.5B9非晶丝巨应力阻抗效应的影响

研究了焦耳退火和等温退火对Fe73.5Cu1Nb3Si13.5B9非晶丝巨应力阻抗效应的影响. 实验结果表明, 非晶合金丝经电流密度为 26 A*mm-2的焦耳处理后, 其阻抗最大变化率达到25%, 灵敏度为1.71%*MPa-1; 淬态样品在580 ℃等温退火0.5 h后, 其阻抗最大变化率达到67%, 灵敏度为0.85%*MPa-1. 这两种退火方法都可以明显改善Fe73.5Cu1Nb3Si13.5B9非晶合金丝的巨应力阻抗效应, 阻抗的最大变化率与退火过程中晶化导致的平均各向异性的改变有关, 而灵敏度的差异是由退火方法导致材料机械性能的差异带来的.     

直流焦耳处理对Co718Fe49Nb08Si75B15玻璃包覆非晶丝非对称巨磁阻抗效应的影响

 研究了Co718Fe49Nb08Si75B15玻璃包覆非晶丝经直流焦耳处理后的非对称巨磁阻抗效应。结果表明，随着处理电流的增加，阻抗最大变化率随之增大，并在处理电流为70 mA时达到最大值。在15 MHz的驱动电流下，阻抗最大变化率为335%，线性区域的灵敏度达1%/(A·m-1)。进一步提高处理电流，导致阻抗最大变化率减小。对钴基玻璃包覆非晶丝的AGMI性能特征用表面阻抗张量进行了讨论。     

Fe-Cu-Nb-Si-B薄带的淬态纳米化与巨磁阻抗效应

使用较低的快淬速度(V =2 2m·s- 1 ) ,可以使Fe Cu Nb Si B薄带实现淬态纳米晶化。Fe Cu Nb Si B薄带析出αFe(Si)纳米相,其晶粒尺寸在淬态薄带Fe73Cu1 .5Nb3Si1 3.5B9中约为15nm ,在Fe71 .5Cu3Nb3Si1 3.5B9中约为10nm。添加Cu元素可以细化淬态薄带的晶粒。实验发现磁阻抗ΔZ/Z0 ,磁电阻ΔR/R0 ,磁电抗ΔX/X0 三条曲线交叉于一点,通过推导发现此现象具有必然性。淬态薄带Fe74 .5-xCuxNb3Si1 3.5B9的磁阻抗显示了较强的Cu含量依赖性。在快淬速度v =2 2m·s- 1 下,在x =1.5和x =3左右观察到磁阻抗峰值现象。     

两段式焦耳处理对Co71.8Fe4.9Nb0.8Si7.5B15非晶薄带巨磁阻抗效应的影响

研究了两段式焦耳处理对Co71.8Fe4.9Nb0.8Si7.5B15非晶薄带巨磁阻抗效应的影响.实验结果表明:经第1段电流密度为15 A/mm2、第2段电流密度为35 A/mm2的复合处理后,样品获得了最大的GMI效应.在8MHz的交变电流频率下,最大磁阻抗比为305%,灵敏度为0.575%/(A·m-1).两段式焦耳处理是提高材料GMI效应的一种新的而且十分有效的方法.     

基于Fe73.5Cu1Nb3Si13.5B9非晶/纳米晶粉的压磁复合材料研究

研究了基于Fe73.5Cu1Nb3Si13.5B9非晶/纳米晶粉的柔性压磁复合材料制备技术及其性能, 讨论了橡胶种类, 磁粉粒径、含量及工艺因素等对Fe73.5Cu1Nb3Si13.5B9/橡胶复合材料压磁性能的影响. 结果表明: 采用粒径为45 μm, 用量约15%的Fe73.5Cu1Nb3Si13.5B9非晶/纳米晶粉与高温硫化有规共聚硅氧烷在171 ℃, 15 Mpa条件下, 硫化45 min制备的、厚度约150 μm的压磁复合材料薄膜具有较好的应力敏感特性和压磁稳定性能, 有望作为新一代柔性、薄型接触应力传感器的敏感元件材料.     

Co基非晶丝退火处理及对巨磁阻抗效应

 采用熔体抽拉法制备了直径59μm 的Co68.25Fe4.5Si12.25B15非晶丝,并在400℃、500℃进行了不同工艺的退火处理,分析了退火前后丝的巨磁阻抗（GMI）效应。结果表明,400℃退火处理降低了丝的各向异性场,提高GMI效应以及双峰出现频率,并大幅提高了磁场响应灵敏度。400℃保温20min退火样品双峰出现频率提高至13MHz。400℃保温80min退火样品低频GMI效应最强,最大阻抗变化率△Z/Z达到468.6%,5MHz时磁场响应灵敏度为57.9%/Oe。 500℃退火,由于晶化析出导致GMI效应降低,双峰出现频率降至3MHz。实验表明经适当退火处理的Co基熔体抽拉丝可用以制备高灵敏度磁传感器的磁敏材料。     

直流焦耳处理对Co71.8Fe4.9Nb0.8Si7.5B15玻璃包覆非晶丝非对称巨磁阻抗效应的影响

研究了Co71.8Fe4.9Nb0.8Si7.5B15玻璃包覆非晶丝经直流焦耳处理后的非对称巨磁阻抗效应.结果表明,随着处理电流的增加,阻抗最大变化率随之增大,并在处理电流为70 mA时达到最大值.在15 MHz的驱动电流下,阻抗最大变化率为335%,线性区域的灵敏度达1%/(A·m-1).进一步提高处理电流,导致阻抗最大变化率减小.对钴基玻璃包覆非晶丝的AGMI性能特征用表面阻抗张量进行了讨论.     

Fe73.5 Cu1 Nb3 Si13.5 B9非晶合金的激光晶化

用CO2连续激光在不同功率、相同的速度条件下辐照Fe73.5Cu1Nb3Si13.5B9非晶带，然后用穆斯堡尔谱详细研究材料的微观结构。研究发现当扫描速度和散文斑直径一定的情况下，适当选择激光功率，Fe73.5Cu1Nb3Si13.5B9可以实现微量晶化。     

熔炼次数对M17返回料合金成分、组织和性能的影响

实验结果表明,M17铸造高温合金(%:0.16C、8.79Cr、5.79A1、4.93Ti、3.29Mo、15.20Co、0.78V、0.015B、0.073Zr、0.002S、0.001P、0.001 1O、0.001 0N)经25 kg真空感应炉返回重熔后,Si含量随重熔次数的增加而略有增加,合金中主要元素和其它杂质元素S、P、H的含量变化不大,而氧、氮略有增加;合金中初生碳化物由新合金中的草书体逐渐向返回合金块状转变,初生碳化物的遗传性堵塞合金凝固时的补缩通道,使返回料合金的疏松倾向增大,高温塑性下降较大。     

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.