Elimination of Dislocations in the Neck Growth

2019 ◽  
Vol 3 (4) ◽  
pp. 25-30
Author(s):  
Hariprasad Sreedharamurthy ◽  
Vijay Nithianathan
Keyword(s):  
Neck Growth

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.

Peculiarities of the neck growth process during initial stage of spark-plasma, microwave and conventional sintering of WC spheres

2012 ◽  
Vol 523 ◽  
pp. 1-10 ◽  
Author(s):  
Dmytro Demirskyi ◽  
Hanna Borodianska ◽  
Dinesh Agrawal ◽  
Andrey Ragulya ◽  
Yoshio Sakka ◽  
...  
Keyword(s):  
Growth Process ◽  
Neck Growth ◽  
Initial Stage ◽  
Conventional Sintering ◽  
Spark Plasma ◽  
Plasma Microwave

Simulation of the neck growth of non-isometric biosphere during initial sintering

2009 ◽  
Vol 22 (4) ◽  
pp. 263-274 ◽  
Author(s):  
Jixiang DU ◽  
Shuhua LIANG ◽  
Xianhui WANG ◽  
Zhikang FAN
Keyword(s):  
Neck Growth

scholarly journals Sintering mechanism. (II) Influence of atmospheric gas on neck growth.

1986 ◽  
Vol 33 (6) ◽  
pp. 296-301
Author(s):  
Yuzo Mori ◽  
Hidetugu Yagi ◽  
Isao Konda ◽  
Kazuto Yamauchi
Keyword(s):  
Neck Growth ◽  
Sintering Mechanism

HRTEM Image of Twin Structure in Nanocrystalline Platinum

1993 ◽  
Vol 51 ◽  
pp. 1160-1161
Author(s):  
Hong-Ming Lin ◽  
Chi-Ming Hsu ◽  
Ching-Shung Huang ◽  
Ming-Shyong Lay ◽  
Pee-Yew Lee
Keyword(s):  
Fourier Transformation ◽  
Nucleation And Growth ◽  
Twin Plane ◽  
Nanocrystalline Powders ◽  
Twin Structure ◽  
Bulk Materials ◽  
Helium Atmosphere ◽  
Neck Growth ◽  
Gas Condensation ◽  
The Individual

This paper presents recent result on the observation of microstructure of nanocrystalline platinum. Nanocrystalline powders of Pt are made by gas condensation method, and examined by using TEM and HRTEM. Twin structure is found first within the individual particle of as evaporated nanophase Pt particles which form twin during the nucleation and growth of particle. Twin also appears while neck growth take place during the sintering of as evaporated pt with Al2O3. The formation of these twins during sintering was due to the fact that the neck growth will induce a tensile stress which is high enough to pull the nanocrystalline powders to form twin structure. Twin plane of nanophase sintering Pt powder was identified by using the Fourier transformation as {111} plane. It is the same as usually found in fcc bulk materials.The pure nanocrystalline Pt particles with a diameter less than 100 nm had been produced by the gas evaporation in helium atmosphere.

Sintering Shrinkage Behavior of Si3N4 Ceramics Prepared by a Post-Reaction Sintering Technique

2008 ◽  
Vol 403 ◽  
pp. 31-34
Author(s):  
Hiromasa Yabuki ◽  
Toru Wakihara ◽  
Junichi Tatami ◽  
Katsutoshi Komeya ◽  
Takeshi Meguro ◽  
...  
Keyword(s):  
Cost Effective ◽  
Raw Material ◽  
Reaction Sintering ◽  
Green Body ◽  
Shrinkage Temperature ◽  
Neck Growth ◽  
Si3n4 Powder ◽  
Sintering Shrinkage ◽  
Si3n4 Ceramics ◽  
Shrinkage Behavior

Post-reaction sintering is one of the fabrication processes of Si3N4 ceramics, which has received considerable attention as a cost-effective process due to the use inexpensive Si powder as a raw material. So far, many researches on the development of this method have been performed in order to improve their properties; however, the sintering shrinkage behavior, which is valuable for the optimization of the firing conditions, has not been well clarified. In this study, we focus on the post-reaction sintering of the Si-Y2O3-Al2O3 system, and investigate its sintering shrinkage behavior by dilatometery. It was found that there is no shrinkage from 1400 to 1600 °C due to grain rearrangements in the green body of the reaction-bonded Si3N4. Furthermore, the shrinkage of the reaction-bonded Si3N4 commenced at approximately 1750 °C, which is higher than the shrinkage temperature of the green body of conventional Si3N4 powder. The restriction of the shrinkage appears to result from the neck growth and strong aggregation among the reacted Si3N4 particles.

Fabrication and Characterization of Porous TiB2 Ceramic with Three-Dimensional Interconnected Skeleton

2007 ◽  
Vol 336-338 ◽  
pp. 1076-1079
Author(s):  
Chang Qing Hong ◽  
Jie Cai Han ◽  
Xing Hong Zhang ◽  
He Xin Zhang
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Bending Strength ◽  
Three Dimensional ◽  
Pressureless Sintering ◽  
Neck Growth ◽  
Selective Heating ◽  
Fabrication And Characterization ◽  
Tib2 Particles

Porous TiB2 ceramics with a three-dimensional interconnected skeleton were fabricated by high temperature pressureless sintering from fine TiB2 powders. The microstructure of the porous TiB2 ceramic was characterized by the enhanced neck growth between the initially touching particles. This neck growth was ascribed to the selective heating of TiB2 particles with different dimension. The porous structure prepared by the high-temperature sintering exhibited higher bending strength and fracture toughness in the present experiment. The improved mechanical properties of the sintered composites were attributable to the enhanced neck growth by surface diffusion.

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