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The Preparation of Soft Magnetic Composites Based on FeSi and Ferrite Fibers 基于FeSi和铁氧体纤维的软磁复合材料制备
Q4 Materials Science Pub Date : 2016-12-01 DOI: 10.1515/pmp-2016-0009
M. Streckova, M. Fáberová, Radovan Bureš, P. Kurek
Abstract The fields of soft magnetic composites and powder metallurgy technologies have a powerful potential to redesign the way of electric motor preparation, and will continue to grow for years to come. A design of the novel soft microcomposite material composed of spherical FeSi particles and Ni0.3Zn0.7Fe2O4 ferrite nanofibers is reported together with a characterization of basic mechanical and electrical properties. The needle-less electrospinning method was used for a preparation of Ni0.3Zn0.7Fe2O4 ferrite nanofibers, which has a spinel-type crystal structure as verified by XRD and TEM analysis. The dielectric coating was prepared by mixing of nanofibers with glycerol and ethanol because of safe manipulation with fumed fibers and homogeneous distribution of the coating around the FeSi particle surface. The final microcomposite samples were prepared by a combination of the traditional PM compaction technique supplemented with a conventional sintering process of the prepared green compacts. The composition and distribution of the secondary phase formed by the spinel ferrite fibers were examined by SEM. It is demonstrated that the prepared composite material has a tight arrangement without any significant porosity, which manifest itself through superior mechanical properties (high mechanical hardness, Young modulus, and transverse rupture strength) and specific electric resistivity compared to the related composite materials including resin as the organic binder.
软磁复合材料和粉末冶金技术在重新设计电机制备方式方面具有强大的潜力,并将在未来几年继续发展。本文设计了一种由球形FeSi颗粒和Ni0.3Zn0.7Fe2O4铁氧体纳米纤维组成的新型软质微复合材料,并对其基本力学性能和电学性能进行了表征。采用无针静电纺丝法制备了Ni0.3Zn0.7Fe2O4铁氧体纳米纤维,通过XRD和TEM分析证实其具有尖晶石型晶体结构。由于气相纤维的安全操作和涂层在FeSi颗粒表面的均匀分布,因此将纳米纤维与甘油和乙醇混合制备了介质涂层。最终的微复合材料样品是由传统的PM压实技术和传统的绿色压实材料烧结工艺相结合制备的。用扫描电镜分析了尖晶石铁素体纤维形成的二次相的组成和分布。结果表明,与以树脂为有机粘结剂的复合材料相比,制备的复合材料排列紧密,无明显孔隙,具有较高的力学性能(机械硬度、杨氏模量和横向断裂强度)和比电阻率。
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引用次数: 2
Sintered Structural Steels Containing Mn, Cr And Mo – The Summary of the Investigations 含锰、铬、钼烧结结构钢研究综述
Q4 Materials Science Pub Date : 2016-12-01 DOI: 10.1515/pmp-2016-0006
M. Sułowski
Abstract The paper is presented the development and method of production of modern, Ni-free sintered structural steels which contain carbide forming alloying elements (Cr) with high affinity for oxygen (Cr, Mn) and the much smaller additive of an expensive alloying element (Mo), enabling the production of structural sintered steels in commercial belt furnaces, using safe sintering atmospheres. The investigations reported deal with the analysis of microstructure and mechanical properties of these sintered structural steels produced in different processing conditions, especially modification of chemical composition of sintering atmosphere and also the connections between the microstructure of sintered material and its mechanical properties. This analysis was done to propose the appropriate chemical composition of sintered Ni-free steels with properties which are comparable or even better than those of sintered structural steels containing rich and carcinogenic nickel. The investigations of PM Mn- Cr-Mo steels were preceded by those on Mn steels.
摘要本文介绍了现代无镍烧结结构钢的发展和生产方法,这种钢含有对氧具有高亲和力的碳化物形成合金元素(Cr) (Cr, Mn)和更少的昂贵合金元素(Mo)添加剂,从而能够在商业带式炉中使用安全的烧结气氛生产结构烧结钢。本文研究了不同工艺条件下烧结结构钢的显微组织和力学性能,特别是烧结气氛的化学成分的改变,以及烧结材料的显微组织与力学性能之间的关系。这一分析是为了提出适当的无镍烧结钢的化学成分,这些钢的性能与含有丰富的致癌镍的烧结结构钢相当甚至更好。对PM Mn- Cr-Mo钢的研究先于对Mn钢的研究。
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引用次数: 0
Static Corrosion Test of Porous Iron Material with Polymer Coating 多孔铁材料聚合物涂层的静态腐蚀试验
Q4 Materials Science Pub Date : 2016-12-01 DOI: 10.1515/pmp-2016-0008
L. Markusova-Buckova, R. Oriňaková, A. Oriňak, R. Gorejová, M. Kupková, M. Hrubovčáková, M. Baláž, K. Kováľ
Abstract At present biodegradable implants received increased attention due to their use in various fields of medicine. This work is dedicated to testing of biodegradable materials which could be used as bone implants. The samples were prepared from the carbonyl iron powder by replication method and surface polymer film was produced through sol-gel process. Corrosion testing was carried out under static conditions during 12 weeks in Hank’s solution. The quantity of corrosion products increased with prolonging time of static test as it can be concluded from the results of EDX analysis. The degradation of open cell materials with polyethylene glycol coating layer was faster compared to uncoated Fe sample. Also the mass losses were higher for samples with PEG coating. The polymer coating brought about the desired increase in degradation rate of porous iron material.
目前,生物可降解植入物因其在医学各个领域的应用而受到越来越多的关注。这项工作致力于测试可用于骨植入物的可生物降解材料。以羰基铁粉为原料,采用复制法制备样品,采用溶胶-凝胶法制备表面聚合物膜。在静态条件下,在Hank的溶液中进行了12周的腐蚀测试。EDX分析结果表明,随着静态试验时间的延长,腐蚀产物的数量增加。与未包覆铁样品相比,包覆聚乙二醇的开孔材料降解速度更快。此外,聚乙二醇涂层样品的质量损失也更高。聚合物涂层使多孔铁材料的降解率得到了预期的提高。
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引用次数: 4
Micromechanisms of Fracture of Magnesium Based Composite After Superplastic Deformation 镁基复合材料超塑性变形断裂的微观机制
Q4 Materials Science Pub Date : 2016-12-01 DOI: 10.1515/pmp-2016-0010
B. Ballóková, K. Sülleiová, M. Besterci,, O. Velgosova, Song-Jeng Huang
Abstract The micromechanisms of fracture of AZ61 + 1 wt. % Al2O3 composite in the zone of superplastic deformation was analysed and quantified in this work. The specimens were tested at temperature of 200°C at different strain rates. Changing the strain rate, from 1x10-2 s-1 to 1x10-4 s-1, a significant growth of ductility was observed. At maximum value of superplasticity the fracture was transcrystalline ductile with dimples of two size categories. Based on the statistical analysis of fracture micromechanisms at the elevated temperature and strain rates of 10-0- 1x10-4 s-1 hyperbolic dependency was depicted according to Gurland - Plateau theory.
摘要:本文对AZ61 + 1 wt. % Al2O3复合材料在超塑性变形区断裂的微观机制进行了分析和量化。试样在200℃温度下以不同应变速率进行测试。当应变速率从1x10-2 s-1增加到1x10-4 s-1时,塑性显著提高。当超塑性达到最大值时,断口呈跨晶延性,有两种大小的韧窝。基于对高温断裂微观机制的统计分析,根据Gurland - Plateau理论描述了10-0- 1x10-4 s-1应变速率下的双曲关系。
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引用次数: 1
Phosphorus in Sintered Steels: Effect of Phosphorus Content and P Carrier in Sintered Steel Fe-C-P 烧结钢中的磷:烧结钢中磷含量及载磷量Fe-C-P的影响
Q4 Materials Science Pub Date : 2016-10-01 DOI: 10.1515/pmp-2016-0001
B. Üregen, C. Gierl-Mayer, H. Danninger
Abstract Phosphorus as an alloy element is quite common in powder metallurgy, the contents industrially used being markedly higher than those present in wrought steels. In this study, the influence of phosphorus addition through different P carriers was investigated. PM steels of the type Fe-0.7%C-x%P (x = 0.0 … 0.8%) were manufactured by pressing and sintering in H2. It showed that Fe3P is the best phosphorus carrier, resulting in fine and regular microstructure and in high impact energy data at 0.3 … 0.45%P while red P and also Fe2P showed a tendency to agglomeration, with resulting secondary porosity. At high P levels the mechanical properties tend to drop, for the tensile strength at P > 0.60%P while for the impact energy the threshold is 0.45%P. The dimensional behaviour of Fe-C-P can be related to PM aluminium alloys, expansion by transient liquid phase being followed by shrinkage by persistent liquid phase, at least at higher temperatures. In contrast to the dimensional behaviour, degassing and reduction is hardly affected by the phosphorus content.
摘要磷作为一种合金元素在粉末冶金中很常见,工业上使用的磷含量明显高于锻钢中的磷含量。本研究考察了不同磷载体对磷添加量的影响。采用高压烧结法制备了Fe-0.7%C-x%P (x = 0.0…0.8%)型PM钢。结果表明,Fe3P是最佳的磷载体,在0.3 ~ 0.45%P范围内,其微观结构精细、规则,冲击能数据较高,而红P和Fe2P有团聚的趋势,并产生次生孔隙。在高磷水平下,材料的力学性能有下降的趋势,抗拉强度为0.60%P,冲击能阈值为0.45%P。Fe-C-P的尺寸行为可以与PM铝合金有关,至少在较高温度下,瞬态液相膨胀随后是持久液相收缩。与尺寸行为相反,脱气和还原几乎不受磷含量的影响。
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引用次数: 4
Analytical Model of the Anisotropic Dimensional Change on Sintering of Ferrous PM Parts 铁粉末冶金零件烧结各向异性尺寸变化的解析模型
Q4 Materials Science Pub Date : 2016-10-01 DOI: 10.1515/pmp-2016-0003
I. Cristofolini, N. Corsentino, M. Larsson, A. Molinari
Abstract This work proposes an analytical model developed from experimental data to describe the anisotropic dimensional change on sintering. Axial-symmetric iron parts differing for geometry and sintering conditions have been investigated, aiming at highlighting the influence of geometry. The specimens were measured in the green and sintered state by a coordinate measuring machine (CMM). The dimensional changes of height, external diameter and internal diameter were derived from measurement results. The anisotropy of the dimensional variations has been studied with reference to the isotropic dimensional change derived from the change in volume of the parts. The influence of geometry and sintering temperature was highlighted. To properly describe the dimensional variations in the compaction plane, the dimensional change of the external diameter versus the dimensional change of the internal one has been analysed. By means of the experimental data, a reliable analytical relationship has been found, dependent on the parts geometry. An anisotropy parameter has been identified, which allows relating the dimensional change in the compaction plane and in the axial direction to the isotropic dimensional change. This parameter depends both on geometry and on sintering conditions. By means of the anisotropy parameter an analytical model for the anisotropic behaviour has been developed.
摘要本文提出了一个基于实验数据的分析模型来描述烧结过程中各向异性的尺寸变化。研究了不同几何形状和烧结条件的轴对称铸铁件,旨在突出几何形状的影响。采用三坐标测量机(CMM)对试样进行了生坯状态和烧结状态的测量。根据测量结果推导出高度、外径和内径的尺寸变化。参考由零件体积变化引起的各向同性尺寸变化,研究了尺寸变化的各向异性。重点讨论了几何形状和烧结温度对烧结性能的影响。为了恰当地描述压实面的尺寸变化,分析了外径尺寸变化与内径尺寸变化的关系。通过实验数据,发现了依赖于零件几何形状的可靠解析关系。确定了各向异性参数,该参数允许将压实平面和轴向的尺寸变化与各向同性尺寸变化联系起来。该参数取决于几何形状和烧结条件。利用各向异性参数建立了各向异性行为的解析模型。
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引用次数: 4
Copper Bronze Powder Surface Studied by XPS and HR SEM 用XPS和HR SEM对铜青铜粉末表面进行了研究
Q4 Materials Science Pub Date : 2016-10-01 DOI: 10.1515/pmp-2016-0004
R. Shvab, E. Hryha, Abdul Malik Tahir, L. Nyborg
Abstract The state of the powder surface represents one of the main interests in the whole cycle of components’ production using powder metallurgy (PM) route. Large specific surface area of the powder in combination with often alloying with oxygen sensitive elements results in oxidation of the powder surface in most of the cases. The information about surface chemistry of the powder is of vital importance for further consolidation and sintering steps. Surface sensitive analytical techniques – X-ray photoelectron spectroscopy (XPS) and high-resolution scanning electron microscopy combined with energy dispersive X-ray analysis (HR SEM+EDX) were used for surface chemical analysis of the 60Cu-40Sn bronze powder. Determination of the compositional profiles and estimation of the surface oxide layer thickness was done by altering of ion etching and XPS analysis. The results showed tin oxide enrichment and presence of copper hydroxide on the surface of the powder particles. The impurities of P, Zn and Ca were also detected on the top surface of the powder in trace amounts.
粉末表面状态是采用粉末冶金工艺生产零件整个生产周期的主要关注点之一。在大多数情况下,粉末的大比表面积与通常与氧敏感元素合金化相结合导致粉末表面氧化。粉末的表面化学信息对进一步的固结和烧结步骤至关重要。采用表面敏感分析技术- x射线光电子能谱(XPS)和高分辨率扫描电镜结合能量色散x射线分析(HR SEM+EDX)对60Cu-40Sn青铜粉进行了表面化学分析。通过改变离子刻蚀和XPS分析,确定了样品的成分分布和表面氧化层厚度。结果表明,粉末颗粒表面存在氧化锡富集和氢氧化铜。粉末顶部表面还检出微量的P、Zn、Ca等杂质。
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引用次数: 1
Phosphorus in Sintered Steels: Interaction of Phosphorus with Mo 烧结钢中的磷:磷与钼的相互作用
Q4 Materials Science Pub Date : 2016-10-01 DOI: 10.1515/pmp-2016-0002
H. Danninger, B. Üregen
Abstract Phosphorus as an alloy element is quite common in powder metallurgy, the contents industrially used being markedly higher than those present in wrought steels. However, embrittlement effects are reported also for sintered steels, in part depending on the alloy elements present. In this study, the influence of phosphorus addition on the mechanical properties of PM steels alloyed with Mo, as the most common VI group element in sintered steels, was investigated. PM steels of the type Fe-x%Mo-0.7%Cy% P were manufactured with varying contents of Mo and P, respectively. It showed that P activates sintering also in these materials and enhances Mo homogenization, but there is in fact a risk of embrittlement in these steels that however strongly depends on the combination of Mo and P in the materials: If a critical level is exceeded, embrittlement is observed. At low Mo contents, higher P concentrations are acceptable and vice versa, but e.g. in a material Fe-1.5%Mo-0.7%C-0.45%P, pronounced intergranular embrittlement occurs, further enhanced by sinter hardening effects. This undesirable phenomenon is more pronounced at higher sintering temperatures and in case of faster heating/cooling; it was observed both in materials prepared from mixed and prealloyed powders, respectively. This typical intergranular failure observed with embrittled specimens, in particular after impact testing, indicates the precipitation of brittle phases at the grain boundaries, apparently when exceeding the solubility product between Mo and P.
摘要磷作为一种合金元素在粉末冶金中很常见,工业上使用的磷含量明显高于锻钢中的磷含量。然而,烧结钢的脆化效应也有报道,部分取决于存在的合金元素。Mo是烧结钢中最常见的VI族元素,本文研究了添加磷对Mo合金化PM钢力学性能的影响。分别制备了Mo和P含量不同的Fe-x%Mo-0.7% cy % P型PM钢。结果表明,P在这些材料中也激活了烧结,并增强了Mo的均质化,但事实上,这些钢中存在脆化的风险,而脆化的风险很大程度上取决于材料中Mo和P的结合:如果超过临界水平,就会观察到脆化。当Mo含量较低时,较高的P浓度是可以接受的,反之亦然,但例如在Fe-1.5%Mo-0.7%C-0.45%P材料中,会发生明显的晶间脆化,烧结硬化效应进一步增强。在烧结温度较高和加热/冷却速度较快的情况下,这种不良现象更为明显;在混合粉末和预合金粉末制备的材料中分别观察到这种现象。在脆化试样中观察到的这种典型的晶间破坏,特别是在冲击试验之后,表明脆性相在晶界处析出,当超过Mo和P之间的溶解度积时,这一点很明显。
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引用次数: 0
The Effect of Transient Liquid Phase on the Joining Process of Aluminum Foam Core Sandwiches 瞬态液相对泡沫铝芯夹层连接过程的影响
Q4 Materials Science Pub Date : 2016-10-01 DOI: 10.1515/pmp-2016-0005
A. T. Tabrizi, M. Azadbeh
Abstract Despite recent developments in sandwich panels production technology, there are some difficulties in joining core sandwiches. Liquid Phase Sintering is a conventional method to increase the density of powder metallurgy parts. In this paper, we applied LPS as a joining process between Al-foam and Al-metal by using Al-mixture powders with different compositions as the interlayer. At first stage, Al-Zn powder mixture was used and the possibility of this process was investigated. At later stages, we tried to increase the joint bonding strength with different Al-mixture powder compositions. 3-point bending test was applied and by using mathematical relations, bonding strengths were calculated. The highest bonding strength was obtained, about 9 kPa, when Al-Zn-Mg was used as the interlayer. Also energy dispersive spectrometry (EDS) was used to investigate the diffusion of additive elemental powders to Al-mixture powders.
摘要:虽然夹芯板的生产技术有了新的发展,但夹芯板的连接仍然存在一些困难。液相烧结是提高粉末冶金零件密度的常用方法。本文采用不同成分的Al-mixture powder作为中间层,将LPS作为Al-foam与Al-metal的连接工艺。第一阶段采用铝锌粉混合物,并对该工艺的可行性进行了研究。在后期,我们尝试用不同的铝混合粉成分来提高接头的结合强度。采用三点弯曲试验,利用数学关系式计算了粘接强度。以Al-Zn-Mg为中间层时,结合强度最高,约为9 kPa。同时用能谱法(EDS)研究了添加性元素粉末在铝混合粉末中的扩散。
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引用次数: 5
期刊
Powder Metallurgy Progress
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