SPS Temperature Influence on the Composition, Structure and Magnetic Properties of Hematite Ceramics

2021 ◽  
Vol 1045 ◽  
pp. 102-108
Author(s):  
Alexey Ognev ◽  
Alexander S. Samardak ◽  
Vladimir Pechnikov ◽  
Evgeniy Papynov
Keyword(s):  
Magnetic Properties ◽  
Spark Plasma Sintering ◽  
Ceramic Materials ◽  
Weak Ferromagnetism ◽  
Initial Study ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Composition Structure ◽  
Field Assisted Sintering ◽  
Powder Metallurgy Methods

Spark Plasma Sintering (SPS), also known as pulsed electric current sintering (PECS) or field assisted sintering technology (FAST), belongs to a class of powder metallurgy methods. Investigations of the effect of thermal, electric and electromagnetic fields arising under the conditions of spark plasma sintering of ceramic materials on their final characteristics are of important fundamental scientific significance. In this regard, the work investigated the effect of the IPA temperature on the structure, composition and magnetic properties of hematite α-Fe2O3 of high purity 99.995%. Changes in the structure and composition of ceramic specimens under SPS conditions in the temperature range 800-1000°C are described by scanning electron microscopy and X-ray phase analysis. The magnetic properties are studied and the regularities of changes of the magnetization (Ms) and coercive force (Hc) under the influence of an external magnetic field for ceramic samples are determined depending on the temperature of the SPS. These results can be considered as initial study of the process of consolidation of materials with weak ferromagnetism under conditions of spark plasma sintering.

Microstructure and Magnetic Properties of Hot-Pressed and Hot-Deformed Composite Magnets Produced by Spark Plasma Sintering Method

2011 ◽  
Vol 686 ◽  
pp. 740-744 ◽  
Author(s):  
Yi Long Ma ◽  
Deng Ming Chen ◽  
Qian Shen ◽  
Peng Jun Cao
Keyword(s):  
Magnetic Properties ◽  
Spark Plasma Sintering ◽  
Hot Pressing ◽  
Magnetic Energy ◽  
Pressing Temperature ◽  
Energy Product ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Energy Products ◽  
Fe Addition

Bulk isotropic and anisotropic Nd13.5Fe80.4Ga0.5B5.6 and Nd13.5Fe80.4Ga0.5B5.6/Fe magnets were synthesized by applying spark plasma sintering (SPS) technique. The effect of hot-pressing temperature on the magnetic properties of hot-pressed (HP) and hot-deformed (HD) magnets without additive and with 5% Fe addition was investigated. With increasing sintering temperature for HP magnets, the grain grew gradually. For HD magnets, the optimal magnetic properties could be obtained at hot-pressing temperature 680°C due to the development of desired c-axis texture and uniform microstructure, which resulted from the appropriate and uniform grain size in HP magnets. Fe addition could enhance remanence (Br) and magnetic energy products ((BH)m) of HP and HD magnets. However, the maximum magnetic energy product of HD magnets decreased when hot-pressing temperature was higher than 650°C.

scholarly journals Consolidation of Fe-Co-Nd-Dy-B Glassy Powders by Spark-Plasma Sintering and Magnetic Properties of the Consolidated Alloys

2003 ◽  
Vol 44 (1) ◽  
pp. 138-143 ◽  
Author(s):  
Satoru Ishihara ◽  
Wei Zhang ◽  
Hisamichi Kimura ◽  
Mamoru Omori ◽  
Akihisa Inoue
Keyword(s):  
Magnetic Properties ◽  
Spark Plasma Sintering ◽  
Plasma Sintering ◽  
Spark Plasma

scholarly journals Magnetic properties of ball-milled SrFe12O19 particles consolidated by Spark-Plasma Sintering

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Marian Stingaciu ◽  
Martin Topole ◽  
Paul McGuiness ◽  
Mogens Christensen
Keyword(s):  
Magnetic Properties ◽  
Spark Plasma Sintering ◽  
Plasma Sintering ◽  
Spark Plasma

scholarly journals Particle size dependent sinterability and magnetic properties of recycled HDDR Nd–Fe–B powders consolidated with spark plasma sintering

2020 ◽  
Vol 38 (1) ◽  
pp. 90-99 ◽  
Author(s):  
Awais Ikram ◽  
Farhan Mehmood ◽  
Richard Stuart Sheridan ◽  
Muhammad Awais ◽  
Allan Walton ◽  
...  
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Spark Plasma Sintering ◽  
Size Dependent ◽  
Plasma Sintering ◽  
Spark Plasma

scholarly journals Spark Plasma Sintering of Ceramics: From Modeling to Practice

Ceramics ◽  
2020 ◽  
Vol 3 (4) ◽  
pp. 476-493
Author(s):  
Michael Stuer ◽  
Paul Bowen ◽  
Zhe Zhao
Keyword(s):  
Spark Plasma Sintering ◽  
Ceramic Materials ◽  
Model Material ◽  
Operational Parameters ◽  
Key Factors ◽  
Engineering Approach ◽  
Plasma Sintering ◽  
Wide Range ◽  
Spark Plasma ◽  
Industrial Settings

Summarizing the work of nearly a decade of research on spark plasma sintering (SPS), a review is given on the specificities and key factors to be considered in SPS of ceramic materials, based on the authors’ own research. Alumina is used primarily as a model material throughout the review. Intrinsic inhomogeneities linked to SPS and operational parameters, which depend on the generation of atomistic scale defects, are discussed in detail to explain regularly observed inhomogeneities reported in literature. Adopting an engineering approach to overcome these inherent issues, a successful processing path is laid out towards the mastering of SPS in a wide range of research and industrial settings.

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