Powder Metallurgy Progress最新文献_第7页

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

Powder Metallurgy Progress Pub Date : 2016-12-01 DOI: 10.1515/pmp-2016-0009

M. Streckova, M. Fáberová, Radovan Bureš, P. Kurek

{"title":"The Preparation of Soft Magnetic Composites Based on FeSi and Ferrite Fibers","authors":"M. Streckova, M. Fáberová, Radovan Bureš, P. Kurek","doi":"10.1515/pmp-2016-0009","DOIUrl":"https://doi.org/10.1515/pmp-2016-0009","url":null,"abstract":"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.","PeriodicalId":52175,"journal":{"name":"Powder Metallurgy Progress","volume":"16 1","pages":"107 - 116"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/pmp-2016-0009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67337780","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}

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

Powder Metallurgy Progress Pub Date : 2016-12-01 DOI: 10.1515/pmp-2016-0006

M. Sułowski

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

Powder Metallurgy Progress 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

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

Powder Metallurgy Progress Pub Date : 2016-12-01 DOI: 10.1515/pmp-2016-0010

B. Ballóková, K. Sülleiová, M. Besterci,, O. Velgosova, Song-Jeng Huang

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

Powder Metallurgy Progress Pub Date : 2016-10-01 DOI: 10.1515/pmp-2016-0001

B. Üregen, C. Gierl-Mayer, H. Danninger

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

Powder Metallurgy Progress Pub Date : 2016-10-01 DOI: 10.1515/pmp-2016-0003

I. Cristofolini, N. Corsentino, M. Larsson, A. Molinari

{"title":"Analytical Model of the Anisotropic Dimensional Change on Sintering of Ferrous PM Parts","authors":"I. Cristofolini, N. Corsentino, M. Larsson, A. Molinari","doi":"10.1515/pmp-2016-0003","DOIUrl":"https://doi.org/10.1515/pmp-2016-0003","url":null,"abstract":"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.","PeriodicalId":52175,"journal":{"name":"Powder Metallurgy Progress","volume":"16 1","pages":"27 - 39"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/pmp-2016-0003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67337306","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}

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

Powder Metallurgy Progress Pub Date : 2016-10-01 DOI: 10.1515/pmp-2016-0004

R. Shvab, E. Hryha, Abdul Malik Tahir, L. Nyborg

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

Powder Metallurgy Progress Pub Date : 2016-10-01 DOI: 10.1515/pmp-2016-0002

H. Danninger, B. Üregen

{"title":"Phosphorus in Sintered Steels: Interaction of Phosphorus with Mo","authors":"H. Danninger, B. Üregen","doi":"10.1515/pmp-2016-0002","DOIUrl":"https://doi.org/10.1515/pmp-2016-0002","url":null,"abstract":"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.","PeriodicalId":52175,"journal":{"name":"Powder Metallurgy Progress","volume":"16 1","pages":"14 - 26"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67337108","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}

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

Powder Metallurgy Progress Pub Date : 2016-10-01 DOI: 10.1515/pmp-2016-0005

A. T. Tabrizi, M. Azadbeh

引用次数: 5