Pub Date : 2018-06-15DOI: 10.22099/IJMF.2018.26954.1093
M. Farshidi
Since tubes have numerous industrial applications, different attempts are focused on the severe plastic deformation processes of tubes. As an illustration, tube channel pressing (TCP) is an attractive process for this purpose since it can be used for processing of different sizes of tubes. However, more attempts are needed to improve the outcomes of TCP. For example, imposing of a greater strain besides reductions of the strain heterogeneity are the challenges of this process. This work is aimed to optimize the die geometry of TCP through a finite element simulation procedure verified by experiments in order to increase the imposed strain as well as to decrease the strain heterogeneity. Results show that the increase of die curvature radius causes decrease of imposed plastic strain and increase of strain heterogeneity. In addition, the minimum amount of die convex height for imposing of a reasonable strain through TCP is calculated considering the tube thickness and the channel angle. Besides this, the optimum die geometry is recommended in order to minimize the strain heterogeneity.
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Pub Date : 2013-10-01DOI: 10.2174/15734137113099990066
M. Ganjali, M. Ganjali, A. Eskandari, M. Aminzare
Article history : Nanocrystalline strontium hexaferrite (SrFe 12 O19 ) powders have been successfully synthesized using facile Co-preci pitation method. Ferrite precursors were obtained from mixtures of strontium and ferric chloride in an aqueous medium without any surfactant and soft template. The as-received powde rs were calcined at 800 and 1000 ˚C for 2 hours in air. The final powders were characterized by X-ray diffraction (XRD), scan ning electron microscopy (SEM), transmission electron microscopy (TEM), BET surface area analysis and Vibrating Sample Magnetometer (VSM). The effects of calcination temperature on phase com position, particle size and shape as well as magnetic propert ies of the products have been investigated. The results indica ted that higher calcination temperature (1000 o C) resulted in higher particle sizes (98.1 nm), maximum saturation magnetization (60.53 emu/g), remanence value (36.23 emu/g) and less surface area (12 m 2 g -1 ). The magnetocrystalline anisotropy constant, K, calc ulated from the Stoner-Wohlfarth theory, increases by increasing te mperature up to 15.1 (HA 2 /kg).
文章历史:采用易溶共沉淀法成功合成了纳米晶六铁酸锶(srfe12o19)粉末。铁氧体前驱体是由锶和氯化铁的混合物在无表面活性剂和软模板的水介质中制备的。将收到的粉末在800℃和1000℃下在空气中煅烧2小时。采用x射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、BET表面积分析和振动样品磁强计(VSM)对制备的粉末进行了表征。研究了煅烧温度对产物相位、粒度、形状及磁性能的影响。结果表明:煅烧温度越高(1000℃)，颗粒尺寸越大(98.1 nm)，最大饱和磁化强度为60.53 emu/g，剩余物值为36.23 emu/g)，比表面积越小(12 m 2 g -1)。根据Stoner-Wohlfarth理论计算的磁晶各向异性常数K随着温度的升高而增加，最高可达15.1 (HA 2 /kg)。
{"title":"Effect of Heat Treatment on Structural and Magnetic Properties of Nanocrystalline SrFe12O19 Hexaferrite Synthesized by Co-Precipitation Method","authors":"M. Ganjali, M. Ganjali, A. Eskandari, M. Aminzare","doi":"10.2174/15734137113099990066","DOIUrl":"https://doi.org/10.2174/15734137113099990066","url":null,"abstract":"Article history : Nanocrystalline strontium hexaferrite (SrFe 12 O19 ) powders have been successfully synthesized using facile Co-preci pitation method. Ferrite precursors were obtained from mixtures of strontium and ferric chloride in an aqueous medium without any surfactant and soft template. The as-received powde rs were calcined at 800 and 1000 ˚C for 2 hours in air. The final powders were characterized by X-ray diffraction (XRD), scan ning electron microscopy (SEM), transmission electron microscopy (TEM), BET surface area analysis and Vibrating Sample Magnetometer (VSM). The effects of calcination temperature on phase com position, particle size and shape as well as magnetic propert ies of the products have been investigated. The results indica ted that higher calcination temperature (1000 o C) resulted in higher particle sizes (98.1 nm), maximum saturation magnetization (60.53 emu/g), remanence value (36.23 emu/g) and less surface area (12 m 2 g -1 ). The magnetocrystalline anisotropy constant, K, calc ulated from the Stoner-Wohlfarth theory, increases by increasing te mperature up to 15.1 (HA 2 /kg).","PeriodicalId":424430,"journal":{"name":"Journal of Advanced Materials and Processing","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130607602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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