静电复印用感光材料的研究进展

综述了感光材料的基本要求及其研究发展过程,重点介绍了OPC感光材料和α-Si光导材料,但α-Si光导材料的生产工艺和成本问题有待解决.研究开发这两种材料是今后的方向.     

β-Si_3N_4含量对Y_2O_3-MgO-α-Si_3N_4陶瓷性能的影响

利用扫描电子显微分析等手段,研究了棒状β-Si3N4含量对Y2O3-MgO-α-Si3N4陶瓷致密度、力学性能和显微结构的影响,确定了β-Si3N4和α-Si3N4的适宜配比。结果显示:随着β-Si3N4含量的增加,Y2O3-MgO-α-Si3N4陶瓷材料致密度和力学性能均先增加后降低,当β-Si3N4含量达到40%时,陶瓷致密度和力学性能同时达到最大,此时致密度为93%,横向断裂强度为583.4 MPa,断裂韧性为5.42 MPa.m1/2。     

金属/a-Si:H(Y)结构的整流特性

在掺稀土元素钇(Y)制备的室温电阻率约为7 Ω·cm 的 n 型非晶硅,即α-Si∶H(Y)薄膜上,蒸发一层面积为3 mm~2的 Au 或 Al 膜,从而形成一种金属/α-Si∶H(Y)结构。测量该结构的电流—电压特性,结果观察到明显的Schottky 势垒整流效应。但与通常情况不同,当加偏压使金属为负时出现电流的导通态,而加偏压使金属为正时出现电流的截止态。这是由于α-Si∶H(Y)表面反型。     

光子晶体光纤PBG导光原理

光子晶体光纤可以通过两种导光机制传播光，即内全反射导光和光子带隙（photonic bandgap，PBG）效应导光。后者在导光特性、色散特性等方面较之传统光纤乃至内全反射光子晶体光纤都有较大的优点。时域有限差分法（FDTD）为研究其导光原理提供了研究方法。     

缩聚型聚酰亚胺结构改性与应用进展

综述了缩聚型聚酰亚胺结构性性的各种途径,介绍了缩聚型聚酰亚胺在膜分离材料、感光材料、耐高温涂料等方面的应用进展,讨论了光活性基团封端改性聚酰亚胺应用于紫外光固化耐高温涂料体系的优越性及可行性。     

α-Si TFT驱动的薄膜电致发光显示

薄膜电致发光(TFEL)显示的突出优点是响应时间短、视角宽、寿命长、易于实现高分辨率、功耗低。但是由于找不到具有极好亮度的红色和蓝色材料,因而阻碍了全彩色EL显示的实现。为了做出全彩色EL,日本正研制用α-Si TFT驱动的有源矩阵EL显示。     

SiCl4/H2为气源低温沉积多晶硅薄膜光电特性的研究

采用PECVD技术,通过改变射频功率制备了晶化率不同的多晶硅薄膜.对多晶硅材料光照稳定性的研究表明,晶化率较低的多晶硅稳定性好于普通非晶硅材料,但仍然存在着光衰减;晶化率较高的多晶硅材料显示出稳恒光电导效应,不存在光衰退现象;光照时多晶硅材料的电导率增加,光注入后因光生载流子对缺陷态的填充使费米能级上移,激活能减小.     

高强高导铜合金研究热点及发展趋势

介绍了高强高导钢合金研究领域的几个热点问题，即：快速冷凝法制备高强高导铜合金，内氧化法和溶胶-凝胶法制备弥散强化铜合金，铜基原位复合材料的制备，铜合金引线框架材料的开发以及稀土在高强高导铜合金中的应用等，综述了高强高导铜合金的研究现状，分析指出：沉淀强化和多元复合微合金化是提高高强高导铜合金性能的有效途径；材料复合化是高强高导铜合金的发展方向；在更多考虑提高合金综合性能的同时还应注重其产业化前景和可持续发展。     

矿用高亮度白光LED灯串封装技术研究

分析了半导体照明高功率白光LED灯串采用InGaN(蓝)/YAG荧光粉将芯片倒装结构,以提高发光效率和散热效果,从白光LED灯串的材料构成,电流/温度/光通量关系得出在倒装芯片的蓝宝石衬底部分(Sapphire)与环氧树脂导光结合面上加上一层硅胶材料以改善芯片出光的折射率。经过光学封装技术的改善,可以大幅度地提高大功率LED灯串的出光率(光通量)。     

Bi元素的添加对Al-Cu-Si三元共晶合金双峰结构转变的影响

为了揭示Bi元素对共晶合金中的凝固组织的影响和作用机理,使用重力凝固法制备了Al-Cu-Si-xBi(x=0%、0.01%、0.03%、0.05%、0.07%)三元共晶合金,分析了不同添加量Bi对Al-Cu-Si三元共晶合金凝固的组织特征、相的生长形态特征及相组成等的影响。结果表明：Al-Cu-Si三元共晶合金具有α-Al/θ-Al2Cu二元共晶和α-Al/θ-Al2Cu/β-Si三元共晶的混合双峰共晶结构。未添加Bi时,α-Al/θ-Al2Cu二元共晶呈现典型的辐射状菊花集群形态,α-Al/θ-Al2Cu/β-Si三元共晶中的Si相呈现长针状形态,双峰共晶结构较不均匀。随着Bi的添加,α-Al/θ-Al2Cu二元共晶呈现均匀细小的短片层结构,Si相变为点针状。双峰共晶结构的层片间距的差值也逐渐缩小,当Bi的添加量为0.05%时,变质效果最好,双峰共晶结构最为均匀细小,合金硬度亦最好。     

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     

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     

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     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。