沈阳市真空应用研究所简介

沈阳市真空应用研究所简介沈阳市真空应用研究所是沈阳市科协科技实业总公司所属的年轻企业。本所有较雄厚的技术力量及生产能力。能根据用户的特殊要求研制和生产各种真空感应熔铸炉，真空电阻烧结炉，真空感应烧结炉，真空钎焊炉等设备。本所为中科院沈阳金属研究所设计...     

上海皓越高温设备有限公司

上海皓越高温设备有限公司是一家集研发、生产、销售电炉为一体的高新技术企业。公司主要经营真空及非真空热处理设备。产品有真空烧结炉,真空热压炉,真空油淬气冷炉,高压高流率气淬炉,真空退火炉,真空回火炉,真空冶炼炉,箱式烧结炉,管式烧结炉,气氛烧结炉等。上海皓越高温设备有限公司所提供的产品技术先进,质量可靠,品种齐全。     

沈阳真空技术研究所三项科技成果通过市级鉴定

20 0 3年 4月 5日 ,由沈阳市科技局主持 ,对沈阳真空技术研究所与沈阳真研真空科技有限责任公司共同开发的 RVS- 5 5 4 2高温电阻真空烧结炉、VQS- 5 0高温感应真空烧结炉以及沈阳真研真空科技有限责任公司自主开发的 VG- 2压力真空计三个研发项目通过了科技成果鉴定。鉴定委员会认为此三项成果均为国内领先水平 ,推广使用价值较大。RVS- 5 5 4 2高温电阻真空烧结炉是目前国内容量最大的高温电阻真空烧结炉 ,可用于大尺寸细长杆件等陶瓷材料的反应烧结和金属材料的真空烧结。 VQS- 5 0高温感应真空烧结炉可广泛应用于高级粉末制品、金…     

铝镍钴高温真空烧结炉的研制

本文详细介绍了真空技术研究所研制的用于烧结铝镍钴磁钢真空烧结炉的性能、结构及真空烧结铝镍钴磁钢的优点及该烧结炉的发展前景。     

新一代RVS系列高真空正压烧结炉的研究

本文提出了一种可替代同期进口设备的新一代ＲＶＳ系列高真空下压烧结炉,介绍了该产品的结构特点,特别是其先进的加热系统,真空系统和冷却系统,给出了该系统高真空正压烧结炉的性能和实际测试指标。     

真空脱蜡烧结炉中差压式载气脱蜡原理的应用

针对真空脱蜡烧结炉中的脱蜡过程和脱蜡要求,借用差压式载气脱蜡原理,对真空脱蜡烧结炉的脱蜡气流通道进行了设计,并分析了设计思路与适用范围。     

真粉烧结炉漏气率对TiB2—Ni金属陶瓷性能的影响

研究了真空烧结炉的不同漏气率对ＴｉＢ２－Ｎｉ金属陶瓷的机械性能的影响。结果表明：低漏气率真空烧结炉烧出的ＴｉＢ２－Ｎｉ试样性能比高温气率炉烧出的试样得多。     

真空烧结炉漏气率对TiB_2-Ni金属陶瓷性能的影响

研究了真空烧结炉的不同漏气率对ＴｉＢ２Ｎｉ金属陶瓷的机械性能的影响。结果表明：低漏气率真空烧结炉烧出的ＴｉＢ２Ｎｉ试样性能比高漏气率炉烧出的试样性能优异得多。     

锦州真空设备制造总厂简介

我厂是国家制造各种真空镀膜机和真空电炉的重点厂 ,属技术密集型企业。几十年来 ,独立设计和研制的真空设备多次获国家经委、机械工业部、辽宁省的科技进步奖。产品遍布全国各省、市、自治区。并远销十几个国家和地区。我厂系列产品如下 :高真空镀膜机、卷绕式真空镀膜机、热反射玻璃与制镜镀膜机、阻容电子元件镀膜机。真空干燥和包装设备。真空感应熔炼炉、真空感应烧结炉、真空热压炉、高真空电阻炉、真空炭管炉、金属雾化沉积炉、真空钎焊炉、真空感应单晶炉、真空感应细晶炉、真空检测仪表以及各种真空泵和真空阀门等。2 0 0 0年 3月…     

诺巴迪材料科技有限公司

正专业的热工技术设备制造商河南诺巴迪材料科技有限公司是一家集研发生产销售热处理设备的专业公司。主要从事材料学科:气相沉积、纳米制备、金属追火、高温烧结和义齿加工领域烧结设备,产品有:真空管式炉、高温箱式炉、晶体退火炉、荧光粉烧结炉、氧化锆牙冠烧结炉、真空烤瓷炉等加热设备,产品内销全国高校、科研院所、工矿企业;外销欧美和中东一些国家,曾获得国家多项专利。完美的外形设计、精湛的内在质量、完善的售后服务体系得到了国内、国际用户的赞誉。     

Hydrogen Reduction and Microstructural Changes of ISF Sinter

The reduction rate and microstructural changes of imperial smelting furnace (ISF) sinter have been investigated by means of thermogravimetric analysis, X-ray difFraction (XRD), scanning electron microscope (SEM ), energy dispersive analysis of X-ray (EDAX) and optical microscope.It is demonstrated that the overall reaction rate of the reduction is influenced by temperature and hydrogen partial pressure in H2 /N2 gas mixtures. There are two distinct zones observed in the partially reduced sinter. The reduction of zincite proceeds predominantly in a narrow range between the two zones, while the reduction of tead oxide and silicate takes place throughout the sinter. The differences between zincite and lead oxide or silicate in reducibility are analysed by thermodynamlcs. The phase transformations and microstructural changes occurring during the reduction process are discussed     

Fabrication of A1/A12O3 Composites and FGM

［1］L.C.Chhabildas: In “Bulletin of the 1995 APS Topic Conference“ on Shock Compress of Condensed Mater,Scatter, Washington, 1995. ［2］L.C.Chhabildas, L.N.Kmetyk and W.D.Reihart: Inter. J. Impact Eng., 1995, 17, 183. ［3］Huaping XIONG, Lianmeng ZHANG, Junguo LI and Runzhang YUAN: J. Mater. Sci.Technol., 1999,15(3), 229. ［4］Huaping XIONG, Lianmeng ZHANG, Qiang SHEN and Runzhang YUAN: Trans. Nonferrous Met. Soc.China., 1999, 9(3), 582. ［5］Qiang SHEN, Lianmeng ZHANG, Huaping XIONG,Jinsong HUA and Hua TAN: Chinese Science Bulletin,2000, 45(8), 878. (in Chinese) ［6］Huaping XIONG, Lianmeng ZHANG, Qiang SHEN,Junguo LI and Runzhang YUAN: Acta Metall. Sin.,1999, 35(10), 1053. (in Chinese) ［7］C.J.Deng, H.Tao, L.M.Zhang and R.Z.Yuan: 6th International Symposium on Functionally Graded Materials, Sept. 10-14,2000, Colorado, U.S.A.     

Characterisation of binary mixtures of pellets and sinter for DEM simulations

To study the distribution of ferrous burden (which is a mixture of pellets and sinter) in the blast furnace, the burden must be characterised in terms of input parameters which can be used in discrete element method (DEM) simulations. A methodology is presented to determine these parameters which can help represent the ferrous burden mixture. First, angle of repose experiments are performed and determined for pellet, sinter and their mixtures at different proportions. Using this experimental data, the DEM parameters individually for pellets and sinter using previously determined experimental values and DEM calibration approach are chosen and they are represented accurately. From these, the values of DEM parameters for pellet-sinter contact are taken as the average of their individual counterparts. Using all determined parameters for intra-material as well as inter-material particle contacts, simulations of angle of repose for mixtures at varying proportions are done and a good match is found between experimental and simulation values at all proportions. In this way, binary mixtures are characterised while maintaining the constituents as individual species.     

Simulation of the pressure drop across granulated mixtures using a coupled DEM – CFD model

The sinter process converts mixtures of iron ore, iron ore fines and fluxes into a fused aggregate (sinter) that is used as burden material in the blast furnace. The rate of this process is predicted by measuring the pressure drop across the green granulated mixture before ignition. A lower pressure drop corresponds with a higher permeability resulting in a higher sinter rate. The addition of fine material, such as concentrate or concentrate agglomerated into micropellets, to the sinter mixture affects the pressure drop. This study numerically predicts the pressure drop over several granulated mixtures in order to reduce the number of experimental measurements. The pressure drop was studied both experimentally using a pot grate and by coupled DEM (Discrete Element Method) – CFD (Computational Fluid Dynamics) simulations. The validation of the model was performed by comparing the measured and numerical values of the pressure drop across glass beads 3 and 6?mm in diameter respectively. The simulation of the pressure drop was extended to granulated mixtures that contain 0–40% concentrate or micropellets. DEM was also used to numerically simulate iron ore granules and relate their mechanical behaviour to particle size distribution, shape, friction coefficient, Young’s modulus and adhesion force.     

高温气冷堆控制棒B4C芯块的研制

阐述了用电弧炉碳热还原法制备核级B4C粉末、经热压烧结制备高温气冷堆控制棒B4C芯块的研制过程，研究了添加剂对制备B4C芯块的影响。     

Fabrication of Al/Al2O3 composites and FGM

Al/Al2O3 composites of different ratios were hot-press sintered at 575 similar to 640℃ under a pressure of 30 MPa for 2 h in a vacuum furnace. It was found that the relative density of the Al/Al2O3 composites could be increased evidently with the rise of sinter temperature. No reaction occurred between Al and Al2O3 at the sinter temperatures. Under 640℃-30 MPa-2 h experimental condition, Al/Al2O3 system FGM was successfully fabricated, and its density range changed quasi-continuously from 2.887x10(3) kg/m(3) to 3.1909x10(3) kg/m3 within the middle 1.0 mm thickness range.     

Site-specific health risk assessment of dioxins and furans in an industrial region with numerous emission sources

While the sources of releasing dioxins have received much attention, the health risks of incinerators are studied considerably more than those of other sources, such as metallurgical industry. Furthermore, risk assessments focus primarily on the effects of single sources; few have addressed the aggregate risks from multiple sources in a region. When many sources of dioxins exist in an area, such as the Industrial Park located in the densely populated district—Siaogang District in southern Taiwan where 17 primary known PCDD/F stationary emission sources are clustered, is the aggregate exposure to these sources imposing high risks even though individual sources comply with emission standards? The study combined the multimedia and multiple pathway exposure modeling and site-specific exposure scenario to assess dioxin risks contributed by the 17 emission sources in the District, including municipal waste incinerators, medical waste incinerators, sinter plants, electric arc furnace, secondary aluminum smelters, cement kilns, etc. The average cancer risk of a resident living in the District was found to be 3.43E−04 under the site-specific exposure scenario. The top emission source is the sinter plant, followed by the electric arc furnace. The information has driven the local government to conduct more complete assessment and at the same time to consider enforcing a stricter local standard of dioxin emissions in the Siaogang District.     

LIGGGHTS and EDEM application on charging system of ironmaking blast furnace

Chemical reactions between gas and raw material are determined by burden distribution, especially radial distribution of pellet/sinter and coke in blast furnace. An appropriate control of burden distribution is required to yield a smooth operation with effective performance and an appropriate gas flow at the wall. This paper studies two different DEM packages application for charing system of ironmaking blast furnace. The simulations (EDEM 2.2.1 and LIGGGHTS 3.4.0) based on the discrete element method (DEM), are validated using mass fraction distribution in the trajectory of pellet flow and burden distributions of pellet on a horizontal plane. The results show that good agreements are found among EDEM, experiment and LIGGGHTS. Furthermore, reducing shear modulus of material can increase calculation speed of DEM.     

A case study on the fracture of sinter machine pallet axles

A sinter machine produces sinter at 1200–1400 °C to supply raw materials for blast furnace ironmaking. The sinter machine is composed of a series of pallet cars which are constrained on rails. Each pallet car has four axles which connect the pallet car and four running rollers. In sinter production, the pallet axles experience periodic thermal expansion and periodic load changes under high temperature, high moisture, corrosive atmosphere and heavy dust. After serving for about seven years, pallet axles of one of ArcelorMittal sinter machines started breaking, causing unscheduled production delay. The fracture of the axles is in the orientation of top and bottom, and the cracks are deeper in upper portions than in lower portions of axle cross sections. The axles have been studied through chemical analysis, strength analysis, stress analysis, lifetime analysis via deterministic mechanics and lifetime distribution analysis. It has been found that the axles are breaking in fatigue-crack mechanism. The fatigue cracks are resulted from effect of thermal expansion on net tensile stress of the axles. Considering harsh working environment and dynamic loading, lifetime analysis, using deterministic mechanics, indicates that originally installed pallet axles are approaching the end of their lifetime. Weibull distribution function can very well describe lifetime distribution of pallet axles. Accordingly, about 50% of originally installed axles will be gone before next two and half years, and more than 90% of them will break before next six and half years. An intelligent replacement strategy is recommended. In a scheduled maintenance time, carefully inspect all axles using ultrasonic crack detectors, and replace those axles whose expected lifetime is shorter than next scheduled maintenance date. To replace steel SAE 1045 with steel SAE 4040 for fabricating new pallet axles may significantly increase lifetime of the new pallet axles.     

YZL—1型真空中频热压连续炉

ＺＹＬ－１型真空中频热压连续烧结炉是新研制出来的一种新型的真空热压烧结设备。主要用于粉末冶金及特种陶瓷工业,它设计新颖,原理先进、结构合理、测控精确度与自动化程度高。在真空热压烧结设备领域里,创造性解决了由间歇式烧结到连续烧结这一技术难关。明显地提高了真空热压制品的生产效率。介绍了烧结工艺,存在的问题及解决方法。