scholarly journals Mechanism of Carbon Contamination in Transparent MgAl2O4 and Y3Al5O12 Ceramics Sintered by Spark Plasma Sintering

Ceramics ◽  
2019 ◽  
Vol 2 (4) ◽  
pp. 612-619 ◽  
Author(s):  
Hussein Hammoud ◽  
Vincent Garnier ◽  
Gilbert Fantozzi ◽  
Etienne Lachaud ◽  
Solène Tadier
Keyword(s):  
Optical Properties ◽  
Spark Plasma Sintering ◽  
Carbon Clusters ◽  
Graphite Foil ◽  
Raman Analysis ◽  
Carbon Contamination ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
And Diffusion ◽  
Sps Sintering

An investigation of MgAl2O4 spinel and Y3Al2O5 (YAG) materials sintered by spark plasma sintering (SPS) was performed. The optical properties of the materials are modified depending on the powder source and the SPS sintering conditions. Spectrophotometer and Raman analysis are presented in this work, along with optical and scanning electron microscope (SEM) observations and cathodoluminescence analysis. The results show a correlation between carbon contamination and the optical properties of the materials. Herein, the source of the contamination is explained, along with its genesis and diffusion. The carbon contamination originates from the powder itself (carbonates), as well as the SPS environment (papiex® graphite foil, graphite die, graphite felt) to form carbon clusters. During the high-temperature SPS process, carbon from those carbon clusters diffuses, resulting in an increase in the contamination volume, thereby increasing the light absorption.

Optical properties of transparent ZnAl2O4 ceramics: A new transparent material prepared by spark plasma sintering

2014 ◽  
Vol 123 ◽  
pp. 142-144 ◽  
Author(s):  
Xu Yong ◽  
Fu Ping ◽  
Zhang Baohua ◽  
Gao Juan ◽  
Zhang Lin ◽  
...  
Keyword(s):  
Optical Properties ◽  
Spark Plasma Sintering ◽  
Transparent Material ◽  
Plasma Sintering ◽  
Spark Plasma

scholarly journals Processing, Mechanical and Optical Properties of Additive-Free ZrC Ceramics Prepared by Spark Plasma Sintering

Materials ◽  
2016 ◽  
Vol 9 (6) ◽  
pp. 489 ◽  
Author(s):  
Clara Musa ◽  
Roberta Licheri ◽  
Roberto Orrù ◽  
Giacomo Cao ◽  
Diletta Sciti ◽  
...  
Keyword(s):  
Optical Properties ◽  
Spark Plasma Sintering ◽  
Plasma Sintering ◽  
Spark Plasma

Improvements on the Properties of the In Situ MgB2/Fe Tapes Annealed by Spark Plasma Sintering Technique

2007 ◽  
Vol 546-549 ◽  
pp. 2059-2062
Author(s):  
Lin Ma ◽  
Hong Li Suo ◽  
Ying Wang ◽  
Hong Xia Ma ◽  
Min Liu ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Vacuum Condition ◽  
Vacuum Furnace ◽  
Sintering Process ◽  
Sintering Mechanism ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Powder In Tube ◽  
Sps Sintering

In-situ MgB2/Fe tapes were fabricated by the powder in tube (PIT) technology using Mg and B powders. The tapes were sintered by both an advanced spark plasma sintering (SPS) and a conventional vacuum furnace, respectively. The effects of these two sintering routes on the properties of the MgB2 tapes were investigated by the analysis of XRD, SEM and the magnetic Jc measurements. It was shown that at 10K, 0T, the magnetic Jc value of the tape sintered using SPS machine at 800°C for 15min under 30MPa were close to 106A/cm2, which was higher than that of the tapes annealed at 700°C for 2h under pressureless vacuum condition. It was found that the density and the homogeneity of the MgB2 core were strongly improved using SPS sintering process, which explained why the MgB2 tapes sintered by SPS method have a higher Jc value. Further enhancement of Jc in the tapes is expected for the understanding of the SPS sintering mechanism.

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

scholarly journals Dielectric and Ferroelectric Studies on High Dense Pb(Zr0.52Ti0.48)O3 Nanocrystalline Ceramics by High Energy Ball Milling and Spark Plasma Sintering

Ceramics ◽  
2019 ◽  
Vol 2 (1) ◽  
pp. 13-24 ◽  
Author(s):  
Venkata Ramana Mudinepalli ◽  
Feng Leng
Keyword(s):  
Dielectric Constant ◽  
Spark Plasma Sintering ◽  
Microwave Sintering ◽  
High Energy ◽  
Pzt Ceramics ◽  
Plasma Sintering ◽  
Structural And Electrical Properties ◽  
Conventional Sintering ◽  
Spark Plasma ◽  
Sps Sintering

In our previous work, we synthesized Pb(Zr0.52Ti0.48)O3 (PZT) ceramics by conventional and microwave sintering methods and studied their structural and electrical properties. We observed that the microwave sintered PZT ceramics show higher densification, fine and uniform grain size, higher dielectric constant, remnant polarization (Pr), and spontaneous polarization (Ps) in comparison to conventional sintered ones. In the present work, we studied the microstructure, phase formation, dielectric, ferroelectric and piezoelectric properties of the PZT ceramics synthesized by using Spark plasma Sintering (SPS) method. The SPS sintering temperature is lower (300 to 400 °C) than both conventional and microwave sintering methods. The dielectric constant at room temperature and at transition temperature shows higher values compared to the microwave and conventional sintering methods. This SPS sintering technique is currently attracting growing attention among productions engineers and materials researchers.

scholarly journals Assessment of carbon contamination in MgAl2O4 spinel during spark-plasma-sintering (SPS) processing

2015 ◽  
Vol 123 (1442) ◽  
pp. 983-988 ◽  
Author(s):  
Koji MORITA ◽  
Byung-Nam KIM ◽  
Hidehiro YOSHIDA ◽  
Keijiro HIRAGA ◽  
Yoshio SAKKA
Keyword(s):  
Spark Plasma Sintering ◽  
Carbon Contamination ◽  
Plasma Sintering ◽  
Spark Plasma
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