Abnormal grain growth enhanced densification of liquid phase-sintered WC–Co in support of the pore filling theory

2012 ◽  
Vol 47 (20) ◽  
pp. 7056-7063 ◽  
Author(s):  
Dong-Yeol Yang ◽  
Duk Yong Yoon ◽  
Suk-Joong L. Kang
Keyword(s):  
Liquid Phase ◽  
Grain Growth ◽  
Abnormal Grain Growth ◽  
Pore Filling

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 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.

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.

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