Microstructure and Mechanical Properties of TiN/Si3N4 Nanocomposites Synthesized by Hydrolysis Method

碩士 === 國立成功大學 === 材料科學及工程學系碩博士班 === 97 === Silicon nitride (Si3N4) has excellent mechanical properties and thermal stability. However, like most ceramics, its brittle nature and difficult to be manufactured into complex shapes has limited its application. When the conductivity of silicon nitride bas...

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Main Authors: Hao-wei Feng, 馮浩偉
Other Authors: Jow-lay Huang
Format: Others
Language:zh-TW
Published: 2009
Online Access:http://ndltd.ncl.edu.tw/handle/90456655113109974960
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spelling ndltd-TW-097NCKU51590562016-05-04T04:25:27Z http://ndltd.ncl.edu.tw/handle/90456655113109974960 Microstructure and Mechanical Properties of TiN/Si3N4 Nanocomposites Synthesized by Hydrolysis Method 利用水解法合成氮化鈦/氮化矽奈米複合材料之微結構及機械性質之研究 Hao-wei Feng 馮浩偉 碩士 國立成功大學 材料科學及工程學系碩博士班 97 Silicon nitride (Si3N4) has excellent mechanical properties and thermal stability. However, like most ceramics, its brittle nature and difficult to be manufactured into complex shapes has limited its application. When the conductivity of silicon nitride based composite was increased by adding the conductive compound as second phase, these compounds can be easily shaped by electrical discharge machining. Because the homogenous distribution of second phase is important for the properties of composite, the TiN/Si3N4 nanocomposite powders were synthesized by hydrolysis method for homogenous distribution of second phase in this study. Experimental results indicated that the amorphous TiO2 could cover the surface of the Si3N4 homogenously after the precursor (titanium tetrakisisopropoxide) were hydrolyzed. Using ammonia for nitridation reaction, TiO2 was nitrided completely at 1100℃ for 5 hr and the particles size of TiN were about 30 nm. The composites were sintered by hot pressing sintering at 1750℃ for 1 hour in 10atm N2. The sintered body consisted of β-Si3N4、Si2N2O、TiN. The grain size of TiN was about 500 nm after sintering, and the larger grain size as increasing as the contents. The addition of 10 vol% TiN has the best toughness 6.56 MPa•m1/2. The toughening mechanisms of the composites were crack deflection, bridging and branching. The addition 30 vol% TiN has the lowest resistivity 70 Ω.cm. Jow-lay Huang 黃肇瑞 2009 學位論文 ; thesis 94 zh-TW
collection NDLTD
language zh-TW
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description 碩士 === 國立成功大學 === 材料科學及工程學系碩博士班 === 97 === Silicon nitride (Si3N4) has excellent mechanical properties and thermal stability. However, like most ceramics, its brittle nature and difficult to be manufactured into complex shapes has limited its application. When the conductivity of silicon nitride based composite was increased by adding the conductive compound as second phase, these compounds can be easily shaped by electrical discharge machining. Because the homogenous distribution of second phase is important for the properties of composite, the TiN/Si3N4 nanocomposite powders were synthesized by hydrolysis method for homogenous distribution of second phase in this study. Experimental results indicated that the amorphous TiO2 could cover the surface of the Si3N4 homogenously after the precursor (titanium tetrakisisopropoxide) were hydrolyzed. Using ammonia for nitridation reaction, TiO2 was nitrided completely at 1100℃ for 5 hr and the particles size of TiN were about 30 nm. The composites were sintered by hot pressing sintering at 1750℃ for 1 hour in 10atm N2. The sintered body consisted of β-Si3N4、Si2N2O、TiN. The grain size of TiN was about 500 nm after sintering, and the larger grain size as increasing as the contents. The addition of 10 vol% TiN has the best toughness 6.56 MPa•m1/2. The toughening mechanisms of the composites were crack deflection, bridging and branching. The addition 30 vol% TiN has the lowest resistivity 70 Ω.cm.
author2 Jow-lay Huang
author_facet Jow-lay Huang
Hao-wei Feng
馮浩偉
author Hao-wei Feng
馮浩偉
spellingShingle Hao-wei Feng
馮浩偉
Microstructure and Mechanical Properties of TiN/Si3N4 Nanocomposites Synthesized by Hydrolysis Method
author_sort Hao-wei Feng
title Microstructure and Mechanical Properties of TiN/Si3N4 Nanocomposites Synthesized by Hydrolysis Method
title_short Microstructure and Mechanical Properties of TiN/Si3N4 Nanocomposites Synthesized by Hydrolysis Method
title_full Microstructure and Mechanical Properties of TiN/Si3N4 Nanocomposites Synthesized by Hydrolysis Method
title_fullStr Microstructure and Mechanical Properties of TiN/Si3N4 Nanocomposites Synthesized by Hydrolysis Method
title_full_unstemmed Microstructure and Mechanical Properties of TiN/Si3N4 Nanocomposites Synthesized by Hydrolysis Method
title_sort microstructure and mechanical properties of tin/si3n4 nanocomposites synthesized by hydrolysis method
publishDate 2009
url http://ndltd.ncl.edu.tw/handle/90456655113109974960
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