Spark Plasma Sintering of Multilayer Ceramics – Case Study of Al2O3-Mg(Ca)TiO3 Sandwich

2014 ◽  
Vol 606 ◽  
pp. 205-208
Author(s):  
Pavel Ctibor ◽  
Tomáš Kubatík ◽  
Pavel Chráska
Keyword(s):  
Spark Plasma Sintering ◽  
Polarized Light ◽  
Ceramic Materials ◽  
Cross Sectional ◽  
Plasma Sintering ◽  
Rapid Fabrication ◽  
Spark Plasma ◽  
Sectional Measurement ◽  
The Individual

Spark plasma sintering enables very rapid fabrication of bulk ceramic materials. Suitability of this technique for preparing of multilayer ceramic discs is up to now relatively seldom reported. Our work is focused on a bi-layered disc consisting of thick Al2O3 layer and comparably thick Mg (Ca)TiO3 (MCT) layer sintered in one run. Al2O3 powder was nanometric (less than 40 nm) and composed of the hexagonal α-phase whereas MCT is a solid solution of two orthorombic perovskites. Pre-sintered and crushed MCT powder was coarser than alumina, up to 125 μm. The purpose of this material combination was creating of dielectric sandwich consisting of capacitor MCT material and resistor nanoalumina material. Spark plasma sintering run was done at 1200 °C, using pressure 80 MPa and dwell time only 2 min. Resulting sandwich was subjected to microstructural observations and cross sectional measurement of microhardness. On the border between Al2O3 and MCT the microhardness was higher than in MCT but has markedly higher dispersion than in the individual components. The MCT material exhibits birefringence in the polarized light [1]. We attempted to correlate the microhardness of individual MCT grains to their orientation indicated by birefringence.

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.

Reactivity of materials towards carbon of graphite foil during Spark Plasma Sintering: A case study using Ni–W powders

2016 ◽  
Vol 168 ◽  
pp. 62-67 ◽  
Author(s):  
Dina V. Dudina ◽  
Boris B. Bokhonov ◽  
Arina V. Ukhina ◽  
Alexander G. Anisimov ◽  
Vyacheslav I. Mali ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Graphite Foil ◽  
Plasma Sintering ◽  
Spark Plasma

Spark Plasma Sintering, Phase Composition, and Properties of AlMgB14 Ceramic Materials

2021 ◽  
Vol 66 (8) ◽  
pp. 1252-1256
Author(s):  
P. Yu. Nikitin ◽  
I. A. Zhukov ◽  
M. S. Boldin ◽  
S. N. Perevislov ◽  
V. N. Chuvil’deev
Keyword(s):  
Phase Composition ◽  
Spark Plasma Sintering ◽  
Ceramic Materials ◽  
Plasma Sintering ◽  
Spark Plasma

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.

Scanning laser melting for rapid and massive fabrication of filled skutterudites with high thermoelectric performance

2018 ◽  
Vol 6 (16) ◽  
pp. 6772-6779 ◽  
Author(s):  
Fan Chen ◽  
Ruiheng Liu ◽  
Zheng Yao ◽  
Yunfei Xing ◽  
Shengqiang Bai ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Thermoelectric Performance ◽  
Scanning Laser ◽  
Fabrication Technique ◽  
Laser Melting ◽  
Plasma Sintering ◽  
Rapid Fabrication ◽  
Filled Skutterudites ◽  
Spark Plasma

A novel rapid fabrication technique that combines scanning laser melting and spark plasma sintering is developed to synthesize bulk filled skutterudites with high thermoelectric performance.

scholarly journals Obtaining Ceramic Materials from Hydroxyapatite Using Spark-Plasma Sintering

2018 ◽  
Vol 37 (7) ◽  
pp. 613-617 ◽  
Author(s):  
Evgeny N. Bulanov ◽  
Maxim S. Boldin ◽  
Alexander V. Knyazev ◽  
Vitaliy Zh. Korokin ◽  
Alexander A. Popov
Keyword(s):  
Spark Plasma Sintering ◽  
Sol Gel ◽  
Polymorphic Transition ◽  
Ceramic Materials ◽  
Endothermic Effect ◽  
Scanning Calorimetry ◽  
Cell Parameters ◽  
Thermal Expansion Coefficients ◽  
Plasma Sintering ◽  
Spark Plasma

AbstractHydroxyapatite was synthesized via sol-gel and solid-state reaction. Both compounds were investigated using high-temperature X-ray diffraction and differential scanning calorimetry. For sol-gel hydroxyapatite, we observed a phase transition, confirmed by character of changing of unit-cell parameters, thermal expansion coefficients and endothermic effect on DTA curve. In the process of obtaining ceramics using spark-plasma sintering both compounds manifested an unexpected shrinkage rate. All effects were explained on the basis of changings in crystal structure during distortion polymorphic transition.

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