专利

专利名称．TiC和TiB混杂增强Ti-AI-Sn-Zr-Mo-Si基复合材料板材的制备方法 TiC和TiB混杂增强Ti—Al—Sn—Zr—Mo—Si基复合材料板材的制备方法,它涉及钛基复合材料板材的制备方法,本发明解决现有的TiC颗粒增强Ti—Al—sn—Zr—Mo—Si基复合材料板材的拉伸性能在650℃以上急剧下降的问题。     

钕氧化物颗粒增强钛基复合材料的显微组织和性能

采用真空自耗电弧熔炼方法成功地研制了原位生成的稀土钕氧化物颗粒增强钛基复合材料.利用光学显微镜观察分析了显微组织.测试了材料的拉伸、热稳定性、持久和蠕变等力学性能.试验结果表明,稀土钕氧化物颗粒在基体上分布比较均匀,并在高温下具有良好的热稳定性.经过1030℃/0.5 h/AC 800℃/1 h/AC 700℃/2 h/AC处理后的钕氧化物颗粒增强钛基复合材料棒材具有良好的拉伸、持久、蠕变和热稳定性等力学性能.     

颗粒增强低成本钛基复合材料

采用TiC颗粒和熔铸法制备TiCp／TIMETAL62S复合材料，研究了钛基复合材料的显微组织和室温力学性能。结果表明：TiCp／TIMETAL62S复合材料的组织由针状αa相、少量β相和TiC颗粒组成；TiC颗粒改变了基体合金原有组织，促进了复合材料组织的细化；钛基复合材料具有良好的室温强度和塑性，复合效果良好。     

气固反应原位生成TiC颗粒增强钛基复合材料

以氢化脱氢钛粉为原料, 经冷等静压成型, 在一定温度下通过CH4和钛粉颗粒间的气固反应在钛粉表面原位生成均匀的TiC颗粒, 采用真空烧结技术制备得到氧含量(体积分数)低于0.2%的TiC颗粒增强钛基复合材料。研究表明, TiC颗粒体积分数比可通过气固反应温度和时间控制, 可获得较高体积分数(> 30%)的TiC颗粒增强钛基复合材料。TiC首先在钛粉颗粒表面形成, 烧结过程中, 钛粉颗粒明显阻碍TiC晶粒长大, 细化TiC晶粒; 同时, 过多的TiC颗粒也阻碍烧结过程中钛的自扩散, 降低烧结相对密度。钛粉压坯在700℃、CH4气氛下发生气固反应(30 min), 再经1300℃烧结后获得的相对密度为98.6%的烧结试样, 试样的综合力学性能较好, 抗拉强度为606 MPa, 延伸率达14.4%, 硬度为HV 442。值得注意的是, 较短时间的气固反应不能够保证压坯内外整体实现原位生成均匀TiC颗粒, 导致烧结试样内外组织的不均性。     

连续SiC纤维增强钛基复合材料横向强度分析

连续SiC纤维增强钛基复合材料(SiCf/Ti)具有良好的综合性能,但其横向性能低于钛合金基体,为了准确地预测SiCf/Ti复合材料的横向强度,提出一种基于界面脱粘强度的计算模型。采用SiCf/Ti复合材料十字拉伸试件来测试复合材料的纤维/基体界面脱粘强度,并分析了热处理工艺对界面脱粘强度影响规律,以及不同纤维之间界面脱粘强度的差别。复合材料横向拉伸试件采用箔-纤维-箔方法制备,每个试件的纤维层数为10层,纤维百分数为30%左右。在不同温度条件下测试复合材料的横向拉伸强度,拉伸温度分别为室温、300,400,550℃,通过对比实验结果和模型预测结果,模型预测的结果与实验结果的误差不超过5%。     

微波烧结原位合成(Ti_5Si_3+TiC)/TC4复合材料组织性能研究

通过Ti-SiC反应体系,选择粒径为45μm的基体TC4,5μm的增强相SiC(质量分数为5%和10%),经过低能球磨混粉后,微波烧结原位合成颗粒增强钛基复合材料。采用X射线衍射仪(XRD)、扫描电镜(SEM)和能谱仪(EDS)对制备的钛基复合材料进行组织结构分析,并对钛基复合材料的致密度、显微硬度、压缩强度、抗拉强度、耐磨性和抗氧化性进行测试研究。结果表明,钛基复合材料主要由增强相TiC,Ti_5Si_3及基体Ti_3种物相组成。TiC呈颗粒状,有明显的棱角,而Ti_5Si_3呈熔融状颗粒,但是颗粒没有明显的棱角,增强相呈准连续网状分布,随着SiC含量的增加,网状结构不清晰,部分增强相团聚在一起。复合材料的相对密度、显微硬度和压缩强度随SiC含量的增加而增加,分别达到98.76%,HV729和2058MPa,但是复合材料的室温拉伸强度随SiC含量增加而降低。引入增强相后,复合材料的抗氧化性和耐磨性均高于基体,且耐磨性和抗氧化性随SiC含量增加而增加,其室温磨损机制主要为粘着磨损。     

增强体含量对TiC/316L复合材料性能的影响

采用粉末冶金法制备增强体颗粒含量为0%、2%、5%、10%和15%的TiC/316L不锈钢复合材料。利用Zwick Roell Z202拉伸试验机测试复合材料的拉伸性能,利用MM-200型环块磨损试验机测试复合材料在干摩擦条件下的摩擦磨损性能,研究TiC颗粒含量对复合材料性能的影响。结果表明:随TiC颗粒的引入,复合材料的强度得到提高,但TiC含量过高,TiC颗粒容易在晶界聚集,导致孔隙的产生和界面连接性的恶化,使复合材料的性能下降。当TiC含量为5%时,复合材料的耐磨性能最好;当TiC含量为10%时,复合材料表现出最高的抗拉强度(655.3 MPa)。     

纳米SiC颗粒增强2024铝基复合材料的力学性能研究

采用粉末冶金法制备了1%(体积分数)纳米SiC颗粒增强2024铝基复合材料,并研究了其力学性能。实验结果表明,1%纳米SiC颗粒增强2024铝基复合材料具有优良的室温力学性能,并且在200℃时表现了较好的高温性能,在315℃时强度下降。研究表明,纳米SiC可以增加增强粒子的表面积,减小增强粒子的颗粒间距,使大量弥散分布的纳米SiC颗粒起到钉扎位错的作用,而且可以细化2024铝基体的晶粒,因而表现了良好的力学性能。     

石墨烯增强钛基复合材料制备工艺与性能研究

以多层石墨烯为增强体,通过熔炼锻造(MF)和粉末冶金(PM) 2种工艺分别制备出规格为Φ10 mm的石墨烯增强钛基复合材料棒材。石墨烯在凝固过程中以TiC枝晶形态析出,变形后呈细小颗粒,其中Ti和C原子比约为2∶1。石墨烯和球形钛粉经过机械合金化和变形加工,在基体中反应形成薄片层。MF工艺对应的棒材拉伸强度可达476 MPa,延伸率保持在28%; PM工艺对应的棒材拉伸强度可达487 MPa,延伸率保持在30%。PM工艺可形成尺寸较小的薄片状石墨烯增强体,强化作用提升,同时塑性没有显著下降。     

不同合金元素的添加对含Ti微合金高强钢组织性能的影响

利用光学显微镜、扫描电镜、透射电镜、能谱分析和拉伸试验等手段,对分别加入Mo、Cr、Nb、Cu等合金元素的含Ti微合金铁素体高强钢组织、析出相和力学性能进行分析,结果表明:铁素体基含Ti微合金高强钢以铁素体为基体,部分微合金钢组织含有极少量粒状贝氏体或珠光体;基体析出粒子尺寸差别较大,大部分尺寸小于10 nm并呈球形、簇状分布,析出物以TiC或(M、Ti)C颗粒为主;5种成分设计的铁素体基含Ti微合金钢均具有良好的室温、高温拉伸性能,550℃拉伸屈服强度均大于380 MPa,为对应室温拉伸屈服强度的63%以上,其中加少量Nb元素的含Ti微合金钢高温和室温屈服强度比最高,达到0.77,具有优异的高温力学性能。     

Acceleration of Electricity Reform Brings Benefit to Big Electricity Users,Aluminum Manufacturers Can Save Costs Up to Several Hundred Million

<正>Recently the National Commission of Development and Reform again assembled experts to solicit opinions,and discussed new electricity reform program.According to information disclosed by experts attending the meeting,in the future electricity reform will undergo top-down design,possibly a     

Qinghai's Aluminum Processing Capacity to Rise at the End of the Year

正Since the release of Implementation Opinions on Carrying out‘Guiding Opinions of the State Council on Resolving Serious Production Overcapacity Conflicts’,according to the actual situation of industry,Qinghai has focused on electrolytic aluminum,cement,ironsteel(including iron alloy and silicon carbide),     

Recent Trends in China's Copper Scrap Market-Part Ⅱ

<正>2.Tianjin Scrap Metal Market In Tianjin,we mainly visited Jinghai Ziy Town scrap market and Binhai New Area’some copper scrap enterprises and enterprise using copper scrap.In Ziya we felt the coppe scrap market was particularly deserted,mos copper scrap enterprises in the town wer closed,industry insiders said in 2012 the plac here was bustling with activity.According to     

Shanghai Clearing House to Roll out Renminbi-denominated Copper Clearing Operations in Free Trade Zone

正Clearing House Financial Markets Co.,Ltd.(Shanghai Clearing House)General Manager Xie Zhong told the media recently at the briefing of the international symposium of"Reform Deepening and Mechanism Innovation of the Post-crisis Kerb Market",Shanghai Clearing House will explore the feasibility of carrying out bond business in     

Development and Application of New Materials for Copper Processing in China

正After over 60 years of developmnt,a system for RD and production of copper processing materials has already taken shape in China.After the reform and opening-up,the application of copper processing materials has gradually expanded from the military industry to civil field.The annual output of copper     

China’s Mineral Exploration Market Downturn Causes Decline of Investment in Bauxite

<正>According to a survey report conducted recently by China Geological Survey Development Research Center,in the first half of 2014,China’s mineral exploration market continued to decline,with the investment in exploration of non-fuel minerals dropping by13.7%and drilling workload dropping by21.7%.According to statistical analysis of the Center,     

Fabricated Copper Production by Province or City in 2014

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Zinc Production by Province in 2014

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China's Aluminum Alloy Cable Market has Taken Shape

正Aluminum alloy cable is a mature product and technology that has been used for nearly fifty years in the U.S.Through six years’promotion,it has been widely recognized and accepted in the China market since 2013,which laid the foundation for the development of the aluminum alloy cable market.Aluminum alloy cable is widely applied in the fields of civil construction and industrial and mining enterprises,especially in real estate,steel and metallurgy.     

Qinghai to Build a 100 Billion Yuan Lithium Industry Base

正At 2014 China Qinghai Trade Fair for Green Development Investment,Qinghai EV Rally2014 was introduced for the first time.With electrical vehicles’eco-friendly features,Qinghai manifested its determination on green development.Introducing Qinghai EV Rally was just a signal.By leveraging its rich salt lake resources