Microstructure and Mechanical Properties of Nano-laminated Titanium Silicon Carbide (Ti3SiC2) Ceramics Synthesized by Hot-pressed Sintering
博士 === 國立成功大學 === 材料科學及工程學系 === 107 === Ti3SiC2 ceramics and TiC/Ti3SiC2 composites have been synthesized by reactive hot-pressed sintering. The influences of composition and preparation parameters on the purity, microstructure, and the reaction mechanism of Ti3SiC2 ceramics were investigated. The m...
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ndltd-TW-107NCKU51590192019-10-25T05:24:19Z http://ndltd.ncl.edu.tw/handle/cay9kj Microstructure and Mechanical Properties of Nano-laminated Titanium Silicon Carbide (Ti3SiC2) Ceramics Synthesized by Hot-pressed Sintering 以熱壓燒結法製備奈米層狀碳化鈦矽陶瓷及其微結構與機械性質之研究 Wen-TseLo 羅文賾 博士 國立成功大學 材料科學及工程學系 107 Ti3SiC2 ceramics and TiC/Ti3SiC2 composites have been synthesized by reactive hot-pressed sintering. The influences of composition and preparation parameters on the purity, microstructure, and the reaction mechanism of Ti3SiC2 ceramics were investigated. The mechanical properties of the TiC/Ti3SiC2 composites and highly pure Ti3SiC2 ceramics were also estimated. Results indicated that the content of Ti3SiC2 increased with increasing hot-pressed temperature up to 1500°C. The amount of excess Si additive had substantial effects on the purity of Ti3SiC2 at the lower hot-pressed temperatures. The samples with 3Ti/SiC/C/0.1Si (molar ratio) hot-pressed at 1500°C for 1 h were predominantly Ti3SiC2 phase (Purity higher than 99 vol%), and the grains exhibited elongated in shape with a grain size of 3 – 8 m. The four-point bending strength, fracture toughness, hardness, and apparent density were 335 MPa, 7 MPa·m1/2, 3 GPa and 4.51 g/cm3, respectively. The deformation response of high pure Ti3SiC2 ceramics have been investigated by performing ballistic impact testing at a range of low velocities. The typical fracture surface of the fragments exhibited transgranular fracture combined with intergranular fracture. Most fracture mechanisms were similar to energy-absorbing mechanisms observed in the vicinity of the indentation. The Si plane was depleted and the remaining thin lamella consisted of six close-packed Ti planes, with five C planes in-between, showing identical stacking as {111} planes in TiC. The Hugoniot elastic limit was estimated to be 10 GPa. The TiC/Ti3SiC2 composite sample exhibits maximum flexural strength of 627 MPa. The composite synthesized from 2TiC/1Ti/1.1Si (molar ratio) composition shows better mechanical properties compared to 2TiC/1Ti/1Si (molar ratio) composition. Jow-Lay Huang 黃肇瑞 2019 學位論文 ; thesis 118 zh-TW |
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博士 === 國立成功大學 === 材料科學及工程學系 === 107 === Ti3SiC2 ceramics and TiC/Ti3SiC2 composites have been synthesized by reactive hot-pressed sintering. The influences of composition and preparation parameters on the purity, microstructure, and the reaction mechanism of Ti3SiC2 ceramics were investigated. The mechanical properties of the TiC/Ti3SiC2 composites and highly pure Ti3SiC2 ceramics were also estimated. Results indicated that the content of Ti3SiC2 increased with increasing hot-pressed temperature up to 1500°C. The amount of excess Si additive had substantial effects on the purity of Ti3SiC2 at the lower hot-pressed temperatures. The samples with 3Ti/SiC/C/0.1Si (molar ratio) hot-pressed at 1500°C for 1 h were predominantly Ti3SiC2 phase (Purity higher than 99 vol%), and the grains exhibited elongated in shape with a grain size of 3 – 8 m. The four-point bending strength, fracture toughness, hardness, and apparent density were 335 MPa, 7 MPa·m1/2, 3 GPa and 4.51 g/cm3, respectively. The deformation response of high pure Ti3SiC2 ceramics have been investigated by performing ballistic impact testing at a range of low velocities. The typical fracture surface of the fragments exhibited transgranular fracture combined with intergranular fracture. Most fracture mechanisms were similar to energy-absorbing mechanisms observed in the vicinity of the indentation. The Si plane was depleted and the remaining thin lamella consisted of six close-packed Ti planes, with five C planes in-between, showing identical stacking as {111} planes in TiC. The Hugoniot elastic limit was estimated to be 10 GPa. The TiC/Ti3SiC2 composite sample exhibits maximum flexural strength of 627 MPa. The composite synthesized from 2TiC/1Ti/1.1Si (molar ratio) composition shows better mechanical properties compared to 2TiC/1Ti/1Si (molar ratio) composition.
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author2 |
Jow-Lay Huang |
author_facet |
Jow-Lay Huang Wen-TseLo 羅文賾 |
author |
Wen-TseLo 羅文賾 |
spellingShingle |
Wen-TseLo 羅文賾 Microstructure and Mechanical Properties of Nano-laminated Titanium Silicon Carbide (Ti3SiC2) Ceramics Synthesized by Hot-pressed Sintering |
author_sort |
Wen-TseLo |
title |
Microstructure and Mechanical Properties of Nano-laminated Titanium Silicon Carbide (Ti3SiC2) Ceramics Synthesized by Hot-pressed Sintering |
title_short |
Microstructure and Mechanical Properties of Nano-laminated Titanium Silicon Carbide (Ti3SiC2) Ceramics Synthesized by Hot-pressed Sintering |
title_full |
Microstructure and Mechanical Properties of Nano-laminated Titanium Silicon Carbide (Ti3SiC2) Ceramics Synthesized by Hot-pressed Sintering |
title_fullStr |
Microstructure and Mechanical Properties of Nano-laminated Titanium Silicon Carbide (Ti3SiC2) Ceramics Synthesized by Hot-pressed Sintering |
title_full_unstemmed |
Microstructure and Mechanical Properties of Nano-laminated Titanium Silicon Carbide (Ti3SiC2) Ceramics Synthesized by Hot-pressed Sintering |
title_sort |
microstructure and mechanical properties of nano-laminated titanium silicon carbide (ti3sic2) ceramics synthesized by hot-pressed sintering |
publishDate |
2019 |
url |
http://ndltd.ncl.edu.tw/handle/cay9kj |
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