Effect of Grain Shape on Abnormal Grain Growth in Liquid-Phase-Sintered Nb1?xTixC?Co Alloys

2002 ◽  
Vol 85 (9) ◽  
pp. 2313-2318 ◽  
Author(s):  
Kyoon Choi ◽  
Nong M. Hwang ◽  
Doh-Y. Kim
Keyword(s):  
Liquid Phase ◽  
Grain Growth ◽  
Grain Shape ◽  
Abnormal Grain Growth ◽  
Co Alloys

Effect of Grain Orientation on the Abnormal Grain Growth with Magetoplumbite Crystal Structure

2007 ◽  
Vol 558-559 ◽  
pp. 1265-1270 ◽  
Author(s):  
Sang Yeup Park ◽  
Jun Ho Song ◽  
Young Jin Cho
Keyword(s):  
Crystal Structure ◽  
Liquid Phase ◽  
Grain Growth ◽  
Grain Orientation ◽  
Grain Shape ◽  
Nucleation And Growth ◽  
Growth Behavior ◽  
Abnormal Grain Growth ◽  
Particle Orientation ◽  
Anisotropic Crystal

The nucleation and growth behavior of magentoplombite has been observed during the abnormal grain growth in the presence of liquid phase. Abnormal grain growth was explained in terms of grain orientation due to liquid phase. It has been observed that the nuclei formation for abnormal grain growth was driven by the capillary force due to the liquid phase. Because magnetoplumbite crystal structure has an anisotropic crystal nature, abnormal grain growth with faceted grain shape was observed depending on its chemical composition. The formation of nuclei and particle orientation was important for the occurrence of abnormal grain growth.

Effect of step free energy on delayed abnormal grain growth in a liquid phase-sintered BaTiO3 model system

2011 ◽  
Vol 31 (5) ◽  
pp. 755-762 ◽  
Author(s):  
Yoon Ho Heo ◽  
Sang-Chae Jeon ◽  
John G. Fisher ◽  
Si-Young Choi ◽  
Kang-Heon Hur ◽  
...  
Keyword(s):  
Free Energy ◽  
Liquid Phase ◽  
Grain Growth ◽  
Model System ◽  
Abnormal Grain Growth

scholarly journals Grain Growth Behavior of 0.95(Na0.5Bi0.5)TiO3–0.05BaTiO3 Controlled by Grain Shape and Second Phase

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1344 ◽  
Author(s):  
Sang-Chae Jeon ◽  
John G. Fisher ◽  
Suk-Joong L. Kang ◽  
Kyoung-Seok Moon
Keyword(s):  
Liquid Phase ◽  
Grain Growth ◽  
Growth Mechanism ◽  
Driving Force ◽  
Grain Shape ◽  
Growth Behavior ◽  
Second Phase ◽  
Two Dimensional ◽  
Grain Growth Behavior ◽  
Powder Compacts

The grain growth behavior of 0.95(Na0.5Bi0.5)TiO3 –0.05BaTiO3 (mole fraction, NBT–5BT) grains was investigated with excess Bi2O3 addition. The powder compacts of NBT–5BT were sintered at 1200 °C for various sintering times and with various amounts of Bi2O3 (0.1, 1.5, 4.0 and 10.0 mol%). When Bi2O3 was added to round-edged cubic NBT–5BT, the grain shape changed to a more faceted cube and the amount of liquid phase increased during sintering. A more faceted cubic grain shape indicates an increase in the critical driving force for appreciable growth of grains. However, obvious abnormal grain growth did not appear in any of the NBT–5BT samples with excess Bi2O3. The amount of liquid phase increased as the amount of Bi2O3 increased. Therefore, the rate of grain growth could be decreased by the increasing the distance for the diffusion of atoms. These observations allowed us to conclude that the growth of Bi2O3-excess NBT–5BT grains is governed by the growth of facet planes via the two-dimensional nucleation grain growth mechanism during changing grain shape and amount of liquid.

Variation of WC grain shape with carbon content in the WC–Co alloys during liquid-phase sintering

2003 ◽  
Vol 48 (5) ◽  
pp. 635-639 ◽  
Author(s):  
Sona Kim ◽  
Seok-Hee Han ◽  
Jong-Ku Park ◽  
Hyoun-Ee Kim
Keyword(s):  
Liquid Phase ◽  
Carbon Content ◽  
Grain Shape ◽  
Liquid Phase Sintering ◽  
Co Alloys

scholarly journals Low-Temperature Sintering of Apatite-Type Lanthanum Silicate with Fluoride Additives

2010 ◽  
Vol 62 ◽  
pp. 235-240
Author(s):  
Junichi Takahashi ◽  
Hidetoshi Honda ◽  
Takaya Akashi ◽  
Kazutomo Abe ◽  
Hidenobu Itoh ◽  
...  
Keyword(s):  
Activation Energy ◽  
Liquid Phase ◽  
Low Temperature ◽  
Bulk Density ◽  
Grain Growth ◽  
Low Temperatures ◽  
Abnormal Grain Growth ◽  
Low Temperature Sintering ◽  
Lanthanum Silicate ◽  
Apatite Type

Various fluorides (3 - 8 wt%) were added to a La9.33Si6O26 (LSO) powder synthesized by calcining the corresponding oxides mixture at 1100°C for 4 h. The addition of BaF2, AlF3 or Ba3Al2F12 caused an appreciable and substantial increase in bulk density after sintering at 1400º and 1450°C, respectively. These fluorides melt below 1400°C to form liquid phase which could assist the densification at low temperatures. Abnormal grain growth was observed for LSO samples with the addition of AlF3 and Ba3Al2F12, but it was effectively suppressed by stepwise sintering at 1400º and 1450°C. The BaF2 addition brought about the simultaneous promotion of densification and moderate grain growth, leading to the production of a densified LSO sample showing a conductivity of 1.5 x 10–2 Scm–1 at 800°C with an activation energy of 1.23 eV.

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