Molecular Dynamics Investigations on Characteristics in Laser Powder Bed Fusion Additive Manufacturing(3D Printing) of Titanium and Tantalum Nanoparticles under Different Heating Rates
碩士 === 南臺科技大學 === 機械工程系 === 104 === In the present study, the molecular dynamics investigations on physical characteristics of solid and hollow spherical titanium and tantalum nanoparticles during laser powder bed fusion additive manufacturing (3D Printing) process are exhibited under different size...
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ndltd-TW-104STUT04890102017-09-17T04:24:19Z http://ndltd.ncl.edu.tw/handle/97553202531272395339 Molecular Dynamics Investigations on Characteristics in Laser Powder Bed Fusion Additive Manufacturing(3D Printing) of Titanium and Tantalum Nanoparticles under Different Heating Rates 以分子動力學模擬方法探討在加熱速率變化下鈦與鉭金屬奈米粒子應用於雷射粉體熔化成型積層製造(3D列印)之特性研究 CHIANG, YU-WEN 江育文 碩士 南臺科技大學 機械工程系 104 In the present study, the molecular dynamics investigations on physical characteristics of solid and hollow spherical titanium and tantalum nanoparticles during laser powder bed fusion additive manufacturing (3D Printing) process are exhibited under different sizes and heating rates. As for titanium, the sizes of titanium nanoparticles are varied from 16a, 20a and 24a, respectively. In addition, the sizes of tantalum nanoparticles are varied from 10a, 16a and 24a, respectively. Regarding both titanium and tantalum, the six combinations of both spherical solid and hollow two-nanoparticle-model are chosen, respectively. The bond angle, neck width, potential energy and gyration radius are utilized to realize the physical properties of nanoscale metallic powders under laser sintering process. Whatever solid or hollow titanium and tantalum nanoparticles, the present results show that the solid state sintering automatically takes place at room temperature. The temperatures of phase change, coalescence, melting of titanium nanoparticle decreased with particle diameter decreasing, but increased with heating rate increasing. Moreover, the temperatures of phase change, coalescence, melting of hollow spherical titanium nanoparticle are also lower than those of solid ones. Meanwhile, we also found that the temperatures of coalescence and melting of tantalum nanoparticle decreased with particle diameter decreasing, but increased with heating rate increasing. At the same time, the temperatures of coalescence and melting of nanoscale hollow tantalum nanoparticle are lower than those of solid ones, also. It is found that the phase change temperature (1220K-1325K) of nanoscale titanium is a little higher than that of bulk titanium, 1155K. Nevertheless, the melting temperature (1200K-1350) of nanoscale titanium is much lower than the melting point of bulk titanium, 1940K. At the same time, it is also found that the melting temperature (2400K-3000K) of nanoscale tantalum is much lower than the melting point of bulk tantalum, 3290K. CHU, LI-MING 朱力民 2016 學位論文 ; thesis 81 zh-TW |
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碩士 === 南臺科技大學 === 機械工程系 === 104 === In the present study, the molecular dynamics investigations on physical characteristics of solid and hollow spherical titanium and tantalum nanoparticles during laser powder bed fusion additive manufacturing (3D Printing) process are exhibited under different sizes and heating rates. As for titanium, the sizes of titanium nanoparticles are varied from 16a, 20a and 24a, respectively. In addition, the sizes of tantalum nanoparticles are varied from 10a, 16a and 24a, respectively. Regarding both titanium and tantalum, the six combinations of both spherical solid and hollow two-nanoparticle-model are chosen, respectively. The bond angle, neck width, potential energy and gyration radius are utilized to realize the physical properties of nanoscale metallic powders under laser sintering process.
Whatever solid or hollow titanium and tantalum nanoparticles, the present results show that the solid state sintering automatically takes place at room temperature. The temperatures of phase change, coalescence, melting of titanium nanoparticle decreased with particle diameter decreasing, but increased with heating rate increasing. Moreover, the temperatures of phase change, coalescence, melting of hollow spherical titanium nanoparticle are also lower than those of solid ones. Meanwhile, we also found that the temperatures of coalescence and melting of tantalum nanoparticle decreased with particle diameter decreasing, but increased with heating rate increasing. At the same time, the temperatures of coalescence and melting of nanoscale hollow tantalum nanoparticle are lower than those of solid ones, also.
It is found that the phase change temperature (1220K-1325K) of nanoscale titanium is a little higher than that of bulk titanium, 1155K. Nevertheless, the melting temperature (1200K-1350) of nanoscale titanium is much lower than the melting point of bulk titanium, 1940K. At the same time, it is also found that the melting temperature (2400K-3000K) of nanoscale tantalum is much lower than the melting point of bulk tantalum, 3290K.
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author2 |
CHU, LI-MING |
author_facet |
CHU, LI-MING CHIANG, YU-WEN 江育文 |
author |
CHIANG, YU-WEN 江育文 |
spellingShingle |
CHIANG, YU-WEN 江育文 Molecular Dynamics Investigations on Characteristics in Laser Powder Bed Fusion Additive Manufacturing(3D Printing) of Titanium and Tantalum Nanoparticles under Different Heating Rates |
author_sort |
CHIANG, YU-WEN |
title |
Molecular Dynamics Investigations on Characteristics in Laser Powder Bed Fusion Additive Manufacturing(3D Printing) of Titanium and Tantalum Nanoparticles under Different Heating Rates |
title_short |
Molecular Dynamics Investigations on Characteristics in Laser Powder Bed Fusion Additive Manufacturing(3D Printing) of Titanium and Tantalum Nanoparticles under Different Heating Rates |
title_full |
Molecular Dynamics Investigations on Characteristics in Laser Powder Bed Fusion Additive Manufacturing(3D Printing) of Titanium and Tantalum Nanoparticles under Different Heating Rates |
title_fullStr |
Molecular Dynamics Investigations on Characteristics in Laser Powder Bed Fusion Additive Manufacturing(3D Printing) of Titanium and Tantalum Nanoparticles under Different Heating Rates |
title_full_unstemmed |
Molecular Dynamics Investigations on Characteristics in Laser Powder Bed Fusion Additive Manufacturing(3D Printing) of Titanium and Tantalum Nanoparticles under Different Heating Rates |
title_sort |
molecular dynamics investigations on characteristics in laser powder bed fusion additive manufacturing(3d printing) of titanium and tantalum nanoparticles under different heating rates |
publishDate |
2016 |
url |
http://ndltd.ncl.edu.tw/handle/97553202531272395339 |
work_keys_str_mv |
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