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Synthesis, structural characterizati...

Kim, Jin Yong.

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Synthesis, structural characterization and microstructural design of glass and ceramic composites.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Synthesis, structural characterization and microstructural design of glass and ceramic composites./
Author:	Kim, Jin Yong.
Description:	203 p.
Notes:	Source: Dissertation Abstracts International, Volume: 59-06, Section: B, page: 2986.
Contained By:	Dissertation Abstracts International59-06B.
Subject:	Engineering, Materials Science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9838212
ISBN:	9780591918717

Synthesis, structural characterization and microstructural design of glass and ceramic composites.
Kim, Jin Yong.

Synthesis, structural characterization and microstructural design of glass and ceramic composites. - 203 p.

Source: Dissertation Abstracts International, Volume: 59-06, Section: B, page: 2986.

Thesis (Ph.D.)--Carnegie Mellon University, 1998.

The first part of this research is focused at synthesizing glasses and glass-ceramics with low dielectric constant. Modified oxide sol-gel (MOSG) and modified oxide sol-precipitation (MOSP) processes were developed to synthesize borophosphosilicate glasses and glass-ceramics. This system was chosen primarily because of its intrinsic low dielectric constant. In both modified sol-gel based processes (MOSG and MOSP), boron and phosphorus alkoxides were synthesized in-situ using stable oxides. The phase evolution and the structure of glasses generated by these processes have been studied and compared using X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. The glasses synthesized using both processes exhibit dielectric constant of

ISBN: 9780591918717Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Synthesis, structural characterization and microstructural design of glass and ceramic composites.
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008 130610s1998 eng d
020 $a 9780591918717
035 $a (UnM)AAI9838212
035 $a AAI9838212
040 $a UnM $c UnM
100 1 $a Kim, Jin Yong. $3 1910893
245 1 0 $a Synthesis, structural characterization and microstructural design of glass and ceramic composites.
300 $a 203 p.
500 $a Source: Dissertation Abstracts International, Volume: 59-06, Section: B, page: 2986.
502 $a Thesis (Ph.D.)--Carnegie Mellon University, 1998.
520 $a The first part of this research is focused at synthesizing glasses and glass-ceramics with low dielectric constant. Modified oxide sol-gel (MOSG) and modified oxide sol-precipitation (MOSP) processes were developed to synthesize borophosphosilicate glasses and glass-ceramics. This system was chosen primarily because of its intrinsic low dielectric constant. In both modified sol-gel based processes (MOSG and MOSP), boron and phosphorus alkoxides were synthesized in-situ using stable oxides. The phase evolution and the structure of glasses generated by these processes have been studied and compared using X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. The glasses synthesized using both processes exhibit dielectric constant of $\ approx $4 .4 at 1 MHz and at room temperature. However, significant differences in the microstructure of the glass-ceramics derived using both the processes have been observed. The MOSG process unlike the MOSP approach leads to inhomogeneity (B-O-B segregation) in the glass after heat treatment in air.
520 $a The second part of the research is focused at developing two new chemical approaches to synthesize aluminum nitride. The phase evolution, structural change and microstructure of the powders have been studied using XRD, FTIR, $\ sp{27} $\ sb2 $ at 800 $\ sp\circ $\ sb2 $ beyond 1200 $\ sp\circ $\ gamma $- AlON and $\ alpha $- Al $\ sb2 $\ sb3 $ phases. Nanocrystalline AlN is obtained when the precursors are heat treated in NH $\ sb3 $ at 800 $\ sp\circ $\ sp\circ $\ gamma $- AlON and $\ alpha $- Al $\ sb2 $\ sb3 $ is obtained after heat treatment of the precursors in NH $\ sb3 $ at 1200 $\ sp\circ $\ sb3 $ at 1300 $\ sp\circ $\ sp{27} $\ sb5 $ in the precursors derived using hydrazine) in comparison to the precursor derived using pure water.
520 $a The third part of the research is directed at processing 3-D interconnected porous aluminum nitride composites infiltrated with glasses. Relationship between sintering conditions and thermal conductivity of the composites has been studied. Detailed analyses have been conducted to study the effect of pretreatment of AlN powders in NH $\ sb3 $ on the sinterability and formation of porous AlN composites. At the same time, the combined effects of this pretreatment and the influence of volume fraction on thermal conductivity has also been studied. (Abstract shortened by UMI.)
590 $a School code: 0041.
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Engineering, Chemical. $3 1018531
690 $a 0794
690 $a 0542
710 2 0 $a Carnegie Mellon University. $3 1018096
773 0 $t Dissertation Abstracts International $g 59-06B.
790 $a 0041
791 $a Ph.D.
792 $a 1998
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9838212