scholarly journals Comparative evaluation of spark plasma (SPS), microwave (MWS),two stage sintering (TSS) and conventional sintering (CRH) on the densification and micro structural evolution of fully stabilized zirconia ceramics

2010 ◽  
Vol 42 (3) ◽  
pp. 259-267 ◽  
Author(s):  
K. Rajeswari ◽  
U.S. Hareesh ◽  
R. Subasri ◽  
Dibyendu Chakravarty ◽  
R. Johnson
Keyword(s):  
Spark Plasma Sintering ◽  
Microwave Sintering ◽  
Structural Evolution ◽  
Stabilized Zirconia ◽  
Two Stage ◽  
Plasma Sintering ◽  
Microstructural Evaluation ◽  
Conventional Sintering ◽  
Different Temperatures ◽  
Spark Plasma

Yttria stabilized zirconia (8YSZ) powders were subjected to densification studies employing various sintering techniques like spark plasma sintering (SPS), microwave sintering (MWS) and two-stage sintering (TSS). The densification and microstructural evolution of the samples are studied and compared with that of conventionally sintered samples (ramp and hold). Depending on the technique employed the samples were sintered at different temperatures to arrive at a minimum density of 99%TD. Detailed microstructural evaluation indicated that a low temperature densification leading to finer sintered grain sizes (~1 ?m) could be achieved by spark plasma sintering followed by the two stage sintering technique with an average sintered grain size of 2.6 microns.

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 Processing of MMC through conventional sintering and spark plasma sintering process: A review

2020 ◽  
Vol 988 ◽  
pp. 012092
Author(s):  
B Stalin ◽  
M Ravichandran ◽  
M Balasubramanian ◽  
C Anand Chairman ◽  
D Pritima ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Sintering Process ◽  
Plasma Sintering ◽  
Conventional Sintering ◽  
Spark Plasma

scholarly journals Effect of Powder Heat Treatment on Chemical Composition and Thermoelectric Properties of Bismuth Antimony Telluride Alloys Fabricated by Combining Water Atomization and Spark Plasma Sintering

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2993
Author(s):  
Dong-won Shin ◽  
Peyala Dharmaiah ◽  
Jun-Woo Song ◽  
Soon-Jik Hong
Keyword(s):  
Spark Plasma Sintering ◽  
Thermoelectric Properties ◽  
Hole Concentration ◽  
Bismuth Antimony Telluride ◽  
Plasma Sintering ◽  
Heat Treated ◽  
Water Atomization ◽  
Powder Samples ◽  
Different Temperatures ◽  
Spark Plasma

In this work, Bi0.5Sb1.5Te3 materials were produced by an economically viable and time efficient water atomization process. The powder samples were heat treated at different temperatures (673 K, 723 K, 743 K, 773 K, 803 K, and 823 K) followed by spark plasma sintering (SPS). It was found that the Te evaporated slightly at 723 K and 743 K and became dominated at 773 K, 803 K, and 823 K, which severely influences the thermoelectric properties. The electrical conductivity was significantly improved for over 803 K heat treated samples due to the remarkable improvement in hole concentration. The power factor values for the 803 K and 823 K samples were significantly larger at T > 350 K compared to other samples. Consequently, the peak ZT of 0.92 at 350 K was obtained for the 803 K sample, which could be useful in commercial thermoelectric power generation.

Preparation and Magnetic Properties of Dense NiCuZn Ferrite by Spark Plasma Sintering

2008 ◽  
Vol 368-372 ◽  
pp. 601-603
Author(s):  
Xi Wei Qi ◽  
Ji Zhou ◽  
Zhen Xing Yue ◽  
Ming Ya Li ◽  
Xiu Mei Han
Keyword(s):  
Spark Plasma Sintering ◽  
Annealing Temperature ◽  
Annealing Treatment ◽  
Impurity Phase ◽  
Uniaxial Pressure ◽  
Plasma Sintering ◽  
Average Grain Size ◽  
Conventional Sintering ◽  
Spark Plasma ◽  
Nicuzn Ferrite

Dense NiCuZn ferrites consisting of fine grains were prepared by spark plasma sintering (SPS) at 750°C for 3 min under a uniaxial pressure of 15 MPa. The powders were densified to >95% of theoretical density by the SPS process, and the average grain size of the prepared NiCuZn ferrite was < 1 /m. The saturation magnetization of prepared specimens (without further annealing treatment) was approximate 50.54 emu/g, which was slightly smaller than that of 52.21 emu/g for specimens prepared by conventional sintering at 980°C for 4 h. Phase identifications indicated that prepared NiCuZn ferrite existed impurity phase (Cu2O), and Cu2O would gradually transform to CuO when annealing temperature increased.

Influence of Multi-Walled Carbon Nanotube Addition on the Hardness of NiAl-CNT and NiAl3-CNT Composites

2019 ◽  
Vol 821 ◽  
pp. 54-58
Author(s):  
Mary Ajimegoh Awotunde ◽  
Olusoji Oluremi Ayodele ◽  
Adewale Oladapo Adegbenjo ◽  
Moses Okoro ◽  
Mxolisi Brendon Shongwe ◽  
...  
Keyword(s):  
High Temperature ◽  
Carbon Nanotube ◽  
Spark Plasma Sintering ◽  
Nickel Aluminide ◽  
Structural Materials ◽  
Nickel Aluminides ◽  
Two Stage ◽  
Plasma Sintering ◽  
Multi Walled Carbon Nanotube ◽  
Spark Plasma

Nickel aluminides have shown great potential as high temperature structural materials. In this study, two classes of nickel aluminide were reinforced with 0.5wt% MWCNTs. Starting powders of nickel, aluminium and MWCNTs were ball milled together using a two stage milling regime and consolidated by spark plasma sintering. The effect of MWCNT reinforcement on the hardness of two classes of nickel aluminide was investigated. Microhardness values revealed a lack of dependence on densification for the NiAl3 composites. The microhardness values of NiAl-CNT reduced with MWCNT addition whereas microhardness values of NiAl3-CNT increased with MWCNT addition.

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