Effective Activation Energy for the Solid-State Sintering of Silicon Carbide Ceramics

2018 ◽  
Vol 49 (11) ◽  
pp. 5599-5606 ◽  
Author(s):  
Dulal Chandra Jana ◽  
G. Sundararajan ◽  
K. Chattopadhyay
Keyword(s):  
Activation Energy ◽  
Silicon Carbide ◽  
Solid State ◽  
Effective Activation Energy ◽  
Effective Activation ◽  
Solid State Sintering ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics

Oxidation of Silicon Carbide Ceramics Obtained by Liquid Phase Sintering

2008 ◽  
Vol 591-593 ◽  
pp. 616-619
Author(s):  
M.J. Bondioli ◽  
Claudinei dos Santos ◽  
B.G. Simba ◽  
Kurt Strecker
Keyword(s):  
Activation Energy ◽  
Silicon Carbide ◽  
Liquid Phase ◽  
Oxide Layer ◽  
Oxidation Mechanism ◽  
Cold Isostatic Pressing ◽  
Liquid Phase Sintering ◽  
N2 Atmosphere ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics

In this work, silicon carbide ceramics were developed by liquid phase sintering using AlN-Y2O3 as additive. Two compositions were obtained using SiC powders and different contents of AlN-Y2O3. The powders were mixed/homogeneizated and subsequently dried and deagglomerated. Powder mixtures were compacted by cold isostatic pressing. Samples were sintered at 2080oC, for 1h, under 0.2 MPa-N2 atmosphere. Sintered samples were characterized by X-Ray diffraction and density. The oxidation behavior was investigated and related to the densification and additive-content. Samples were submitted to the tests at 1200, 1300 or 1400oC, in air for 120 hours. Weight gain of the samples is plotted as function of the exposure time, obtaining the evolution of the oxidation on the surface of the samples. Based on the results, the parabolic oxidation content (kp) and activation energy were determined. The results indicate that the samples present parabolic behavior in all conditions. The activation energy results indicate that the phenomena of diffusion of oxygen ions into the oxide layer and interfacial reactions between oxide layer and intergranular phase are the responsible for oxidation mechanism.

Effects of Vickers Cracks on the Mechanical Properties of Solid-phase-sintered Silicon Carbide Ceramics

2012 ◽  
Vol 27 (9) ◽  
pp. 965-969
Author(s):  
Xiao YANG ◽  
Xue-Jian LIU ◽  
Zheng-Ren HUANG ◽  
Gui-Ling LIU ◽  
Xiu-Min YAO
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
Solid Phase ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics ◽  
Sintered Silicon

Vickers indentation crack analysis of solid-phase-sintered silicon carbide ceramics

2013 ◽  
Vol 39 (1) ◽  
pp. 841-845 ◽  
Author(s):  
Xiao Yang ◽  
Xuejian Liu ◽  
Zhengren Huang ◽  
Xiuming Yao ◽  
Guiling Liu
Keyword(s):  
Silicon Carbide ◽  
Solid Phase ◽  
Vickers Indentation ◽  
Crack Analysis ◽  
Indentation Crack ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics ◽  
Sintered Silicon

MAGNETIC RESISTIVITY IN Bi2Sr2Ca(Cu1-xCox)2Od EPITAXIAL THIN FILMS

2007 ◽  
Vol 21 (01) ◽  
pp. 127-132
Author(s):  
T. R. YANG ◽  
G. ILONCA ◽  
V. TOMA ◽  
P. BALINT ◽  
M. BODEA
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
Activation Energy ◽  
Glass Transition ◽  
Effective Activation Energy ◽  
Epitaxial Thin Films ◽  
Effective Activation ◽  
High Quality ◽  
Plastic Deformations ◽  
Magnetic Resistivity

The scaling behavior of the effective activation energy of high-quality epitaxial c-oriented Bi 2 Sr 2 Ca ( Cu 1-x Co x)2 O d thin films with 0≤x ≤0.025 has been studied as a function of temperature and magnetic field. For all samples, the effective activation energy scales as U(T, μoH)=Uo(1-T/T c )mHn with exponent m=1.25±0.03, n=-1/2 and the field scaling 1/μoH and -UμoH for thick films and ultra thin films, respectively. The results are discussed taking into account of the influence of the Co substitution with a model in which U(T, H) arises from plastic deformations of the viscous flux liquid above the vortex-glass transition temperature.

scholarly journals Surface Nitridation of Silicon Carbide Ceramics

1989 ◽  
Vol 97 (1131) ◽  
pp. 1348-1353
Author(s):  
Tadahisa ARAHORI ◽  
Nobuya IWAMOTO
Keyword(s):  
Silicon Carbide ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics
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