scholarly journals In Situ Investigation of the Silicon Carbide Particles Sintering

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Yu Niu ◽  
Feng Xu ◽  
Xiaofang Hu ◽  
Jianhua Zhao ◽  
Hong Miao ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Solid State ◽  
Growth Exponent ◽  
Time Curve ◽  
Neck Growth ◽  
Neck Size ◽  
In Situ Investigation ◽  
Solid State Sintering ◽  
Time Observation ◽  
Sintering Neck

A real-time observation of the microstructure evolution of irregularly shaped silicon carbide powders during solid state sintering is realized by using synchrotron radiation computerized topography (SR-CT) technique. The process of sintering neck growth and material migration during sintering are clearly distinguished from 2D and 3D reconstructed images. The sintering neck size of the sample is presented for quantitative analysis of the sintering kinetics during solid state sintering. The neck size-time curve is obtained. Compared with traditional sintering theories, the neck growth exponent (7.87) obtained by SR-CT experiment is larger than that of the two-sphere model. Such condition is discussed and shown in terms of sintering neck growth, in which the sintering process slows down when the particle shape is irregular rather than spherical.

Scanning Electron Microscopy of Sintered Copper Spheres

1971 ◽  
Vol 29 ◽  
pp. 208-209
Author(s):  
A. C. Nyce ◽  
J. M. Wehrung
Keyword(s):  
Solid State ◽  
Surface Area ◽  
Nuclear Reactor ◽  
Spherical Particles ◽  
Metal Powders ◽  
Neck Growth ◽  
Sintered Copper ◽  
Equal Importance ◽  
Solid State Sintering ◽  
Fuel Elements

Parts produced by the solid state sintering of compacted or loose metal powders are used widely in such critical applications as nuclear reactor control rods and fuel elements, rocket nozzles, corrosion resistant porous filters, automobile parts and many others of equal importance. However, the mechanisms of mass transport responsible for sintering of metal and ceramic powders remain controversial despite over 20 years of experimental and theoretical studies (1) and (2).In an effort to elucidate the mechanisms of solid state sintering, Nyce and Liebenthal determined neck growth, shrinkage, B.E.T. surface area, and sintered strength for nominal 48 and 115 micron diameter, nitrogen-atomized, spherical copper particles containing less than 0.2% oxygen. These relationships were determined as a function of sintering time at temperatures of 850°C and 950°C. Nyce and Liebenthal found by assuming a) microscopically smooth surfaces, b) fracture occurring at necks, and c) reasonably uniform necks between spherical particles that strength, shrinkage, and neck growth could be quantitatively described in terms of B.E.T. surface area measurements.

Capturing shrinkage and neck growth with phase field simulations of the solid state sintering

2021 ◽  
Vol 29 (7) ◽  
pp. 075008
Author(s):  
Vladimir Ivannikov ◽  
Fritz Thomsen ◽  
Thomas Ebel ◽  
Regine Willumeit-Römer
Keyword(s):  
Solid State ◽  
Phase Field ◽  
Neck Growth ◽  
Solid State Sintering

A Microscopic Model of the Asymmetric Neck Growth during Sintering Process upon the Asymmetric Particle Arrangement

2011 ◽  
Vol 327 ◽  
pp. 66-71
Author(s):  
Yu Niu ◽  
Feng Xu ◽  
Xiao Fang Hu ◽  
Yong Cun Li ◽  
Jing Zhao ◽  
...  
Keyword(s):  
Growth Rate ◽  
Contact Area ◽  
Monte Carlo Model ◽  
Traditional Theory ◽  
Sintering Process ◽  
Sphere Model ◽  
Particle Rotation ◽  
Neck Growth ◽  
Neck Size ◽  
Particle Arrangement

A kinetic Potts Monte Carlo model was used to investigate the microstructural evolution of a three particles configuration during sintering. The a series of peculiar phenomena was observed and analyzed quantitatively, which indicated that even if the particle shape and the contact area are both completely symmetrical, the asymmetric neck growth will arise due to a special particle arrangement. Although the linear relationship between neck size logarithm and time logarithm was consistent with the traditional theory, a slower neck growth rate comparing with that of the two sphere model displayed a result of the asymmetric neck growth. The analysis of the particle rotation was made to confirm the occurrence of the asymmetric neck growth. It was firstly observed that the morphology of the grain boundaries became bevel, and the reason for this morphology was discussed. All the special phenomena have proved that the asymmetric particle arrangement about the contact area can trigger the unstable neck growth.

Population balance model for solid state sintering II. Grain growth

2001 ◽  
Vol 27 (1) ◽  
pp. 63-71 ◽  
Author(s):  
S Sivakumar ◽  
Manjunath Subbanna ◽  
Satyam S Sahay ◽  
Vijay Ramakrishnan ◽  
P.C Kapur ◽  
...  
Keyword(s):  
Solid State ◽  
Grain Growth ◽  
Population Balance ◽  
Balance Model ◽  
Population Balance Model ◽  
Solid State Sintering
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