低温沉积法金刚石－金属化学键合工艺研究

采用低温沉积工艺在金刚石表面镀复钨合金，通过键合处理，钨可和金刚石表面碳原子形成稳定的碳化钨层。键合层的存在有利于保护金刚石的强度性能，大幅度提高了金刚石与胎体的粘结强度、锯片与钻头的使用性能。金相检测证实了金刚石表面键合层的存在，并反映出键合层有质地均匀、分布连续、涂复率高的特点。     

等离子体刻蚀处理对 金刚石膜结合性能影响的研究

研究了一种特殊的前处理工艺,即原位氩－氢等离子体刻蚀,对金刚石膜与硬质合金基体结合性能的影响．结果表明,氩－氢等离子体刻蚀能明显地粗化基体表面,改变表面的化学成分,并形成一层纯钨层．当这层纯钨层在后续的工艺中被再次碳化后,金刚石膜与基体的结合强度得到明显提高     

等离子体刻蚀处理对金刚石膜结石性能影响的研究

研究了一种特殊的前处理工艺,即原位氩－氢等离子体制蚀,对金刚石膜与硬质合金基体结构性能的影响,结果表明江 氩－氢等离子体刻馒有明显地粗化基本表面,改变表面的化学成分,并形成一层纯钨层。当这层纯钨层在后续的工艺中被再次碳化后,金刚石膜与与基体的结合结构得到明显提高。     

直流等离子射流CVD法合成金刚石膜的研究

采用直流等离子CVD法,以甲烷作碳源,在钼、硅、钨和石英等基体上合成了高质量的金刚石膜。其生长速率达60μm/h。合成的金刚石膜呈半透明状,膜的表面形貌随着沉积条件的变化而变化。X射线衍射结果表明,在钼、钨和硅基片上合成的金刚石膜与基体之间有一层碳化物的过渡层。     

提高人造金刚石钻头质量的有效途径

采用真空气相沉积法在金刚石表面镀覆强碳化物金属或合金薄膜。该薄膜一方面与金刚石表面形成化学键合,另一方面大大提高与金属胎体的浸润性,从而明显增强金刚石在金属胎体中的结合强度,提高金刚石钻头性能和使用寿命。     

金刚石焊接机理的实验研究

分析了目前国内金刚石制品中金刚石在胎体中的存在形式、金刚石的焊接机理和改善金刚石表面性质的方法，研究了采用金属添加剂使金刚石表面形成金属碳化物界面层的工艺方法。通过生产工艺试验，实现了在常规制造工艺条件下，金刚石与胎体金属的焊接，从而提高了制品的性能、生产效率、使用寿命，降低了产品成本。     

钨锰矿(010)表面电子结构及性质第一性原理计算

用基于密度泛函理论的DMol3计算了钨锰矿不同(010)断裂键解理面的结构弛豫、Mulliken电荷布居和表面能,考察不同断裂键方式对表面能及表面电子结构性能的影响。锰钨矿单晶胞中Mn—O键比W—O键离子性强,平均键长更长,键能更小,沿Mn—O键断裂所形成的(010)解理面具有更小表面能,性质更稳定,是钨锰矿的理想(010)解理面。理想钨锰矿(010)解理面电荷密度差和态密度分析结果表明,Mn原子是表面活性原子,由于表面相中Mn—O原子相互作用较体相中增强,表面Mn原子活性降低。第一性原理计算结果能为实际矿石浮选的深入理论研究提供指导和参考。     

微粒黑钨矿选择性絮凝—浮选研究

本文介绍了作者对微粒黑钨矿选择性絮凝—浮选进行的研究工作。研究结果表明:选择性絮凝—浮选工艺处理微粒黑钨矿是十分有效的,对黑钨矿与石英人工混合矿进行分离,获得了钨精矿品位(wo_3)57%、回收率75%的指标,与常规浮选相比,钨精矿品位(wo_3)提高9%,回收率提高20%。运用各种测试手段,对絮凝剂在黑钨矿表面的键合形式、絮凝剂与捕收剂在黑钨矿表面及溶溶液中的相互作用、絮凝—浮选过程中黑钨矿的粒度变化进行了研究。根据各种测试结果,提出了絮凝剂与捕收剂在黑钨矿表面的吸附模型。     

不同金属/氢终端金刚石（100）界面结构的第一性原理研究

金刚石薄膜/金属的接触界面结构直接影响到其在微电子器件领域的应用。良好的欧姆接触和较强的结合力是决定金刚石薄膜电子器件性能的关键。通过基于密度泛函理论的第一性原理方法构建了不同金属(金、钛、铜、铝、钨)/氢终端金刚石(100)基底的界面模型,研究了其结合性能。结果表明,虽然所有金属/金刚石界面均呈现稳定的界面结构,但是金、铜、铝三种金属与氢终端金刚石基底的结合能较低,金属层驰豫较小,电荷在吸附表面并没有明显转移,结合能力较差。相比之下,钨、钛与氢终端金刚石基底具有较好的结合力,结合能较高,金属层呈现明显驰豫现象,呈现较强的界面结合力。     

用价电子理论分析Y对Mg—Al合金力学性能的影响

基于EET理论,计算Y元素加入Mg-Al合金后形成的Mg-Al-Y固溶体、第二相Al2Y的价电子结构,研究价电子结构与合金固溶强化、第二相强化、高温稳定性的关系.Mg-Al-Y最强键共价电子对数nA值和共价电子密度pvc值均大于a-Mg的nA值和pvc值,表明Y元素的固溶有利于基体强度的提高.第二相Al2Y的最强键(nA=0.39704)的键合强度远大于基体a-Mg(nA=0.11199)的键合强度.因此,Al2Y极大的阻碍了位错的运动.提高了合金的强度.Al2Y的单位体积成键能力FvAl2Y值为103.81,与y-Mg17Alt2(Fvy-Mg17A112=44.22)相比较,Al2Y的高温稳定性更好.其存在有利于改善Mg-Al合金的高温性能.     

China rare earth market review

正November 1~10,2014Chinese rare earth market was still inactive.Demand for rare earth products was weak.Consumers took a wait-and-see attitude for lower price.As it was an off season for rare earth products,it was expected that prices of rare earth could continue turbulence at the bottom in short terms.Due to a sharp drop,demand for rare earth from downstream recovered.Affected by new energy vehicles,wind powder and energy-efficient appliances,production of rare earth permanent     

China rare earth market review

正August 1~10,2014 There was some good news in rare earth industry recently.Restructuring plans of rare earth groups led by Baotou IronSteel Group and Xiamen Tungsten Group respectively have been approved by MIIT.And rare earth storage policy,which had been expected for a very long time,has been launched officially.Pushed by the good news,rare earth price started to rebound since August 5.Price of didymium oxide and dysprosium oxide rose about 1% to 2%,averagely.About 10% of     

China rare earth market review

正July 1~10,2014Due to weak demand from downstream industry and slow transactions,rare earth market remained weak and price of rare earth products continued to decline.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,     

New energy vehicle:an opportunity for rare earth magnets

<正>Extracted from Securities Guide 1.Popularity of new energy vehicles—an irresistible market trend1.1 Progress of new energy vehicles Chinese Premier Li Keqiang said recently on a visit to Xi'an BYD Autos that new energy vehicles,especially new energy bus,can lessen environment and noise pollution.He encouraged the use of new     

注浆加固技术在十三矿-685 m进风大巷中的应用

针对煤矿开采深度不断向深部延伸,掘进巷道受深部高应力的影响越来越大,巷道围岩整体稳定性差,矿山压力显现越剧烈现象,一般锚网喷加锚索支护无法从根本上控制巷道的变形。总结了平煤股份十三矿-685 m进风大巷注浆加固技术,依据对巷道掘进之后变形监测数据的采集,对巷道变形机理进行分析研究,并对注浆时段进行了合理选择,在对巷道的注浆工艺进行了充分论证的基础上,对巷道进行了注浆。注浆后效果表明:巷道滞后注浆时间段的选择非常重要,巷道在恰当的时间内进行注浆加固施工,能有效控制巷道的变形,巷道注浆后变形量明显减小,岩体的稳定性明显增强,减少了巷道日常维修工作,降低了矿井的生产成本,保障了矿井的安全生产。     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel