Kinetic of Direct Nitridation of Titanium Powder
碩士 === 國立臺灣科技大學 === 化學工程系 === 88 === Kinetics on the direct nitridation of titanium pellet by nitrogen gas was studied. The morphology of the partially reacted titanium pellet was studied and the ground powder of solid sample was monitored by an X-ray diffractometer to determine the conce...
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ndltd-TW-088NTUST3420012016-01-29T04:18:54Z http://ndltd.ncl.edu.tw/handle/70074306754725820241 Kinetic of Direct Nitridation of Titanium Powder 鈦粉直接氮化之動力學研究 Ching-hua Meng 孟慶華 碩士 國立臺灣科技大學 化學工程系 88 Kinetics on the direct nitridation of titanium pellet by nitrogen gas was studied. The morphology of the partially reacted titanium pellet was studied and the ground powder of solid sample was monitored by an X-ray diffractometer to determine the concentrations of Ti, TiN0.5 and TiN. The experimental variables are: (1)reaction temperature (1,173-1,473K); (2)sample thickness(1.2x10-3-6.38x10-3m) and (3)reaction time(0-18ks). Experimental results indicated that the overall reaction was controlled by chemical reaction when reaction temperature was in the range of 1,173- 1,473K and the pellet thickness was under or equal 1.2x10-3m. As the reaction temperature was 1,373K or 1,473K and the pellet thickness was 6.38x10-3m, the overall reaction was controlled by gas pore diffusion. As the reaction temperature was between 1,173K and 1,473K and the pellet was between 3.0x10-3m and 5.5x10-3m as well as reaction temperature was 1,173K or 1,273K and the pellet thickness was 6.38x10-3m, the overall reaction was controlled by both chemical reaction and gas pore diffusion. A physico-chemical model has been formulated to provide the description of the experimental data. The chemical reaction rate expressions which were used after the model had been employed for interpreting the experimental data. The expression for effective gas diffusivity, which has been left as a fitting parameter for calculation of theoretical prediction was determined as De=1.373x10-5exp(-13,065.7/RT) m2/s The correlation between the geometrical factor, g, and the pellet thickness L was found to be g=1/(1+11.47L) Lin Chun-I 林俊一 1999 學位論文 ; thesis 159 zh-TW |
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碩士 === 國立臺灣科技大學 === 化學工程系 === 88 === Kinetics on the direct nitridation of titanium pellet by nitrogen gas was studied. The morphology of the partially reacted titanium pellet was studied and the ground powder of solid sample was monitored by an X-ray diffractometer to determine the concentrations of Ti, TiN0.5 and TiN. The experimental variables are: (1)reaction temperature (1,173-1,473K); (2)sample thickness(1.2x10-3-6.38x10-3m) and (3)reaction time(0-18ks).
Experimental results indicated that the overall reaction was controlled by chemical reaction when reaction temperature was in the range of 1,173- 1,473K and the pellet thickness was under or equal 1.2x10-3m. As the reaction temperature was 1,373K or 1,473K and the pellet thickness was 6.38x10-3m, the overall reaction was controlled by gas pore diffusion. As the reaction temperature was between 1,173K and 1,473K and the pellet was between 3.0x10-3m and 5.5x10-3m as well as reaction temperature was 1,173K or 1,273K and the pellet thickness was 6.38x10-3m, the overall reaction was controlled by both chemical reaction and gas pore diffusion.
A physico-chemical model has been formulated to provide the description of the experimental data. The chemical reaction rate expressions which were used after the model had been employed for interpreting the experimental data. The expression for effective gas diffusivity, which has been left as a fitting parameter for calculation of theoretical prediction was determined as
De=1.373x10-5exp(-13,065.7/RT) m2/s
The correlation between the geometrical factor, g, and the pellet thickness L was found to be
g=1/(1+11.47L)
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author2 |
Lin Chun-I |
author_facet |
Lin Chun-I Ching-hua Meng 孟慶華 |
author |
Ching-hua Meng 孟慶華 |
spellingShingle |
Ching-hua Meng 孟慶華 Kinetic of Direct Nitridation of Titanium Powder |
author_sort |
Ching-hua Meng |
title |
Kinetic of Direct Nitridation of Titanium Powder |
title_short |
Kinetic of Direct Nitridation of Titanium Powder |
title_full |
Kinetic of Direct Nitridation of Titanium Powder |
title_fullStr |
Kinetic of Direct Nitridation of Titanium Powder |
title_full_unstemmed |
Kinetic of Direct Nitridation of Titanium Powder |
title_sort |
kinetic of direct nitridation of titanium powder |
publishDate |
1999 |
url |
http://ndltd.ncl.edu.tw/handle/70074306754725820241 |
work_keys_str_mv |
AT chinghuameng kineticofdirectnitridationoftitaniumpowder AT mèngqìnghuá kineticofdirectnitridationoftitaniumpowder AT chinghuameng tàifěnzhíjiēdànhuàzhīdònglìxuéyánjiū AT mèngqìnghuá tàifěnzhíjiēdànhuàzhīdònglìxuéyánjiū |
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