Densification mechanism involved during spark plasma sintering of a codoped α-alumina material: Part I. Formal sintering analysis

2009 ◽  
Vol 24 (1) ◽  
pp. 179-186 ◽  
Author(s):  
G. Bernard-Granger ◽  
C. Guizard
Keyword(s):  
Grain Boundary ◽  
Spark Plasma Sintering ◽  
Boundary Diffusion ◽  
Grain Boundary Sliding ◽  
Alumina Powder ◽  
Densification Mechanism ◽  
Material Part ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Boundary Sliding

Spark plasma sintering (SPS) of a codoped α-alumina powder has been investigated at temperatures between 850 and 1200 °C. The “grain size versus relative density” trajectory showed a significant grain growth as soon as the residual porosity closed. The densification mechanism was determined by anisothermal (investigation of the heating part of a SPS run) and isothermal methods. It was proposed that grain-boundary sliding, accommodated by oxygen grain-boundary diffusion, governed densification.

Creep Deformation of 10 mol% La2O3 + YSZ Ceramic Composite Prepared by Spark Plasma Sintering

2014 ◽  
Vol 783-786 ◽  
pp. 1087-1092
Author(s):  
Karen D. Robles-Arellano ◽  
Lukas Bichler
Keyword(s):  
Spark Plasma Sintering ◽  
Ceramic Composite ◽  
Grain Boundary Sliding ◽  
Lattice Diffusion ◽  
X Ray Diffraction ◽  
X Ray ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Boundary Sliding ◽  
Potential Use

Development of creep-resistant 8mol% Yttria-stabilized Zirconia (YSZ) ceramic has received much interest due to its potential use in fuel cells and thermal barrier coatings. In this research, Spark Plasma Sintering was used to develop a high-density 10 mol% La203 + YSZ composite. Compressive creep testing was performed at 1300 oC at 45 – 78 MPa load. The mechanism of plastic deformation of the composite was studied using Scanning Electron Microscopy and X-Ray Diffraction. The results suggest that lattice diffusion and grain boundary sliding were the active creep mechanisms.

Grain boundary diffusion driven spark plasma sintering of nanocrystalline zirconia

2012 ◽  
Vol 38 (5) ◽  
pp. 4385-4389 ◽  
Author(s):  
Hanna Borodianska ◽  
Dmytro Demirskyi ◽  
Yoshio Sakka ◽  
Petre Badica ◽  
Oleg Vasylkiv
Keyword(s):  
Grain Boundary ◽  
Spark Plasma Sintering ◽  
Boundary Diffusion ◽  
Grain Boundary Diffusion ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Nanocrystalline Zirconia

scholarly journals Thermo-electro-mechanical modeling of spark plasma sintering processes accounting for grain boundary diffusion and surface diffusion

2021 ◽  
Vol 67 (5) ◽  
pp. 1395-1407
Author(s):  
A. S. Semenov ◽  
J. Trapp ◽  
M. Nöthe ◽  
O. Eberhardt ◽  
B. Kieback ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Surface Diffusion ◽  
Spark Plasma Sintering ◽  
Boundary Diffusion ◽  
Grain Boundary Diffusion ◽  
Experimental Results ◽  
Interparticle Contact ◽  
Mechanical Problem ◽  
Plasma Sintering ◽  
Spark Plasma

AbstractIn the present research, a numerical modeling approach of the initial stage of consolidation during spark plasma sintering on the microscopic scale is presented. The solution of a fully coupled thermo-electro-mechanical problem also accounting for grain boundary and surface diffusion is found by using a staggered way. The finite-element method is applied for solving the thermo-electro-mechanical problem while the finite-difference method is applied for the diffusion problem. A Lagrange-based non-linear formulation is used to deal with the detailed description of plastic and creep strain accumulation. The numerical model is developed for simulating the structural evolution of the involved particles during sintering of powder compacts taking into account both the free surface diffusion of the particles and the grain boundary diffusion at interparticle contact areas. The numerical results obtained by using the two-particle model—as a representative volume element of the powder—are compared with experimental results for the densification of a copper powder compact. The numerical and experimental results are in excellent agreement.

scholarly journals Phenomenological analysis of densification mechanism during spark plasma sintering of MgAl2O4

2009 ◽  
Vol 24 (6) ◽  
pp. 2011-2020 ◽  
Author(s):  
Guillaume Bernard-Granger ◽  
Nassira Benameur ◽  
Ahmed Addad ◽  
Mats Nygren ◽  
Christian Guizard ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Interface Reaction ◽  
Grain Boundary Sliding ◽  
Lattice Diffusion ◽  
Densification Rate ◽  
Densification Mechanism ◽  
Plasma Sintering ◽  
Transmission Electron ◽  
In Series ◽  
Spark Plasma

Spark plasma sintering (SPS) of MgAl2O4 powder was investigated at temperatures between 1200 and 1300 °C. A significant grain growth was observed during densification. The densification rate always exhibits at least one strong minimum, and resumes after an incubation period. Transmission electron microscopy investigations performed on sintered samples never revealed extensive dislocation activity in the elemental grains. The densification mechanism involved during SPS was determined by anisothermal (investigation of the heating stage of a SPS run) and isothermal methods (investigation at given soak temperatures). Grain-boundary sliding, accommodated by an in-series {interface-reaction/lattice diffusion of the O2− anions} mechanism controlled by the interface-reaction step, governs densification. The zero-densification-rate period, detected for all soak temperatures, arise from the difficulty of annealing vacancies, necessary for the densification to proceed. The detection of atomic ledges at grain boundaries and the modification of the stoichiometry of spinel during SPS could be related to the difficulty to anneal vacancies at temperature soaks.

Grain-boundary diffusion coefficient in α-Al2O3 from spark plasma sintering tests: Evidence of collective motion of charge disconnections

2018 ◽  
Vol 44 (15) ◽  
pp. 19044-19048 ◽  
Author(s):  
Yoshihiro Tamura ◽  
Eugenio Zapata-Solvas ◽  
Bibi Malmal Moshtaghioun ◽  
Diego Gómez-García ◽  
Arturo Domínguez-Rodríguez
Keyword(s):  
Diffusion Coefficient ◽  
Grain Boundary ◽  
Spark Plasma Sintering ◽  
Boundary Diffusion ◽  
Collective Motion ◽  
Grain Boundary Diffusion ◽  
Plasma Sintering ◽  
Boundary Diffusion Coefficient ◽  
Spark Plasma ◽  
Α Al2o3

Densification and Thermal Conductivity of Y2O3-Doped AlN Ceramics by Spark Plasma Sintering

2007 ◽  
Vol 352 ◽  
pp. 227-231 ◽  
Author(s):  
Qiang Shen ◽  
Z.D. Wei ◽  
Mei Juan Li ◽  
Lian Meng Zhang
Keyword(s):  
Thermal Conductivity ◽  
Grain Boundaries ◽  
Spark Plasma Sintering ◽  
Particle Surface ◽  
Boundary Phase ◽  
Homogeneous Microstructure ◽  
Densification Mechanism ◽  
Sintering Additive ◽  
Plasma Sintering ◽  
Spark Plasma

AlN ceramics doped with yttrium oxide (Y2O3) as the sintering additive were prepared via the spark plasma sintering (SPS) technique. The sintering behaviors and densification mechanism were mainly investigated. The results showed that Y2O3 addition could promote the AlN densification. Y2O3-doped AlN samples could be densified at low temperatures of 1600-1700oC in 20-25 minutes. The AlN samples were characterized with homogeneous microstructure. The Y-Al-O compounds were created on the grain boundaries due to the reactions between Y2O3 and Al2O3 on AlN particle surface. With increasing the sintering temperature, AlN grains grew up, and the location of grain boundaries as well as the phase compositions changed. The Y/Al ratio in the aluminates increased, from Y3Al5O12 to YAlO3 and to Y4Al2O9. High-density, the growth of AlN grains and the homogenous dispersion of boundary phase were helpful to improve the thermal conductivity of AlN ceramics. The thermal conductivity of 122Wm-1K-1 for the 4.0 mass%Y2O3-doped AlN sample was reached.

Densification mechanism of Ti-based metallic glass powders during spark plasma sintering process

2015 ◽  
Vol 66 ◽  
pp. 1-7 ◽  
Author(s):  
L.H. Liu ◽  
C. Yang ◽  
Y.G. Yao ◽  
F. Wang ◽  
W.W. Zhang ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Spark Plasma Sintering ◽  
Sintering Process ◽  
Densification Mechanism ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Glass Powders
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