TiN/ZrN抗冲蚀多层膜制备及其性能研究

采用多靶位真空阴极电弧离子镀技术在1 Cr17 Ni2不锈钢表面沉积抗冲蚀 TiN/ZrN 多层膜,利用扫描电镜、显微硬度计、划痕仪、冲刷试验机和中性盐雾试验机等对多层膜的结构及性能进行研究.结果表明：所制备的TiN/ZrN多层膜厚度为5.24μm,膜层与基体结合力为55 N,显微硬度为HK2026.6;多层膜对不锈钢基体起到了良好的防护作用,耐90°攻角冲刷砂量为50 g,耐中性盐雾腐蚀96 h 无腐蚀,336 h抗腐蚀性能大于9级.     

钛合金表面渗钼涂层的组织和性能研究

采用固体粉末包埋法在钛合金表面制备了渗钼涂层, 用金相显微镜、扫描电子显微镜(SEM)、能谱(EDS)仪以及X射线衍射(XRD)仪, 对不同热处理制度下涂层的形貌、组织结构、元素分布进行了分析。在900 ℃以上加热时, 得到了渗Mo涂层, 涂层由沉积层和扩散层组成, 涂层厚度随温度的提高而增加, 在1 050 ℃/6 h处理时, 其中扩散层厚度达到了370 μm, 涂层和基体界面间的裂痕被消除。涂层由外往里的相组成依次为Mo、β(Ti)、α″(Ti)、α′(Ti), 改变了原钛合金表面的相结构。涂层显微硬度最大值达到HV0.25 1 400 以上, 达到了提高钛合金涂层硬度的目的。     

石墨烯增强钛基复合材料的热等静压研究

以TC4钛合金球形粉和石墨烯纳米片为原料,通过低温高能球磨使石墨烯均匀分散于钛合金粉末基体上,采用热等静压工艺使复合材料烧结致密.研究了热等静压温度对复合材料显微组织、力学性能和热导率的影响.结果表明:随着热等静压温度的升高,材料的拉伸强度降低,而塑性提高,900℃热等静压时热导率取得最大值;与未添加石墨烯的纯钛合金相比,复合材料强度和热导率提高而塑性大幅度下降.     

低温回火对低碳马氏体超高强钢组织及力学性能的影响

研究了低温回火对经过正火+淬火处理的Q1100超高强钢显微组织与力学性能的影响。结果表明，经正火(890℃×40 min)+淬火(890℃×30 min)+回火(185～320℃×90 min)处理的实验钢主要获得回火马氏体组织。不同温度回火后，实验钢抗拉强度均大于1 360 MPa、屈服强度均大于1 200 MPa、硬度均大于400HV3、延伸率均大于13%、-40℃冲击功均大于35.0 J。随着回火温度升高，实验钢抗拉强度逐渐下降，屈服强度先上升后下降，硬度逐渐降低，断后延伸率先略微下降后逐渐上升，-40℃冲击功先下降后上升。回火温度230℃时，实验钢抗拉强度(1 445 MPa)、屈服强度(1 238 MPa)、硬度(429HV3)、塑性(13.8%)和-40℃冲击韧性(47.5 J)均表现优异，大幅超过Q1100级工程机械用超高强钢的服役标准。     

回火温度对高强度截齿钢组织和性能的影响

研究了35SiMnMo截齿钢900℃正火后不同的回火温度对其组织及性能的影响。实验结果表明,35SiMnMo钢900℃正火250℃回火强度出现最高值,回火温度在200～300℃时硬度值最高,不同温度回火,冲击韧度在300℃回火出现峰值,400℃出现了回火脆性,超过400℃回火冲击韧度升高。900℃正火、250℃回火试验材料可获得超高强度和一定的冲击韧度,900℃正火+600℃高温回火试验材料可获得高强度和高的冲击韧度。     

时效处理对Co基合金堆焊重熔层组织和性能的影响

通过金相、扫描电镜显微组织分析, 显微硬度测定, 高温磨损试验, 对经不同工艺参数时效处理的Co基合金堆焊重熔层进行了分析研究。结果表明, 堆焊重熔层组织主要是细小的等轴状枝晶γ-Co及其间分布的共晶组织; 经时效处理后, 主要是γ-Co基体上弥散分布着合金碳化物和骨架状的共晶组织。在时效处理时, 随着时效温度的不断提高, 堆焊重熔层表面硬度随之升高, 在900 ℃时硬度达到最大值, 然后急剧下降; 相比较, 经长时(12 h)时效处理的堆焊重熔层硬度高于经短时(6 h)时效处理。经时效处理的堆焊重熔层高温耐磨性均优于未经时效处理的堆焊重熔层, 并且经短时(6 h)时效处理的堆焊重熔层的高温耐磨性好于经长时(12 h)时效处理。     

超音速火焰喷涂WC-17Co涂层氧化行为研究

WC-17Co涂层由于其优异的耐磨性能,被广泛用于工件的摩擦防护,但其在较高温度下服役存在过早氧化失效的问题。采用超音速火焰喷涂在45#钢表面制备WC-17Co致密涂层,将其置于400、500、600和700 ℃的温度下进行恒温热暴露,研究超温服役氧化行为对其结构及性能的影响。采用X射线衍射、扫描电镜和显微硬度计等手段表征喷涂态及不同氧化温度下涂层的物相和微观结构的演变,对其物相和性能变化进行讨论。研究结果表明：喷涂过程中WC的分解及过冷使喷涂态WC-17Co涂层形成少量的Co基非晶;400 ℃热暴露后,涂层物相和结构无明显变化,当热暴露温度提高到500 ℃以上时,涂层表面CoWO₄、WO₃和Co₃O₄等氧化相开始生成,在700 ℃氧化处理2 h后,氧化物生长层增厚到10 μm;氧化促使涂层内部的Co元素向表面扩散,导致涂层内部WC硬质相的浓度提高,故内部涂层的显微硬度也大幅提高,在距离表面50 μm深度涂层显微硬度增加到1400 HV_0.3以上;表层显微硬度升高则主要是由于氧化相的生成。高温氧化后,由于Co粘结相的减少使涂层断裂韧性降低,涂层在高速摩擦环境下,疏松的氧化物层易粉化失效,故WC-17Co涂层的服役温度应保持在500 ℃以下。     

时效对Cu-Cr-Zr-Y合金显微硬度及导电率的影响

探讨时效温度及变形量对Cu-0.40Cr-0.67Zr-0.021Y合金显微硬度及导电率的影响。结果表明,合金经950℃×1h固溶处理后在480℃时效+40%变形×0.25h,可达到较好的硬度和导电率,分别为133HV和82.83%IACS。     

预热对K360耐磨钢堆焊层组织与性能的影响

利用药芯焊丝对已磨损的K360 耐磨钢板进行CO 2 气体保护堆焊修复,在焊前进行不同温度的预热处理,并对不同预热处理的堆焊层进行了显微组织、XRD、硬度、冲击韧度及抗磨料磨损性能试验。结果表明,不同预热温度处理的堆焊层的组织均为马氏体+碳化物+少量残余奥氏体;经150,200 ℃预热处理,堆焊层硬度较高,韧性较高,耐磨性也较好,耐磨性分别可达到母材的1.583倍和1.494倍;预热温度250 ℃时,堆焊层的韧性较低,耐磨性也出现大幅下降,仅为母材耐磨性的1.148倍。     

镍钴双阳极对电铸合金铸层性能的影响

采用镍钴双阳极电铸工艺制备镍钴合金铸层，研究不同钴阳极面积及电流密度对铸层钴含量和显微硬度的影响。结果表明：随着钴阳极面积的增加，电铸液中钴离子的浓度升高，铸层的钴含量和显微硬度逐渐增加。随着钴阳极电流密度的增加，铸层的钴含量和显微硬度先下降后升高，钴阳极电流密度3A/dm2时对铸层钴含量和显微硬度影响最显著。在镍阳极电流密度3A/dm2,钴阳极电流密度1A/dm2，镍钴双阳极面积相等时，铸层的钴含量最多，显微硬度最高，为523.5HV。     

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