Gelcasting of silicon preforms for the production of sintered reaction-bonded silicon nitride

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Gelcasting of silicon metal for the production of sintered reaction-bonded silicon nitride (SRBSN) was investigated in order to identify associated advantages over conventional forming techniques, i.e., die and isostatic pressing. Compacts were formed from identical powder mixtures by both gelcasting and pressing, and were nitrided and sintered to produce SRBSN ceramics using both conventional and microwave heating. Characterization of the samples included measurement of green density, green and nitrided pore structure, weight gain during nitridation, final density, microstructure, toughness, and flexural strength. It was found that a more uniform pore structure existed in the green gelcast samples. It is believed ... continued below

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8 p.

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Kiggans, J. O., Jr.; Nunn, S. D.; Tiegs, T. N.; Davisson, C. C.; Coffey, D. W. & Maria, J.P. December 1995.

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Description

Gelcasting of silicon metal for the production of sintered reaction-bonded silicon nitride (SRBSN) was investigated in order to identify associated advantages over conventional forming techniques, i.e., die and isostatic pressing. Compacts were formed from identical powder mixtures by both gelcasting and pressing, and were nitrided and sintered to produce SRBSN ceramics using both conventional and microwave heating. Characterization of the samples included measurement of green density, green and nitrided pore structure, weight gain during nitridation, final density, microstructure, toughness, and flexural strength. It was found that a more uniform pore structure existed in the green gelcast samples. It is believed that this pore configuration aided in nitridation, and manifested itself in a more uniform final microstructure. In addition, improved mechanical properties were achieved in the gelcast samples. This improvement can be attributed to green microstructure homogeneity. An additional finding of this study was that microwave hearing combined with gelcast forming resulted in SRBSN materials with improved mechanical properties.

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8 p.

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OSTI as DE96003764

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  • 4. international conference on powder metallurgy, Anaheim, CA (United States), 8-10 May 1995

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  • Other: DE96003764
  • Report No.: CONF-9505313--1
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 172474
  • Archival Resource Key: ark:/67531/metadc672126

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  • December 1995

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  • June 29, 2015, 9:42 p.m.

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  • Jan. 22, 2016, 11:09 a.m.

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Kiggans, J. O., Jr.; Nunn, S. D.; Tiegs, T. N.; Davisson, C. C.; Coffey, D. W. & Maria, J.P. Gelcasting of silicon preforms for the production of sintered reaction-bonded silicon nitride, article, December 1995; Tennessee. (digital.library.unt.edu/ark:/67531/metadc672126/: accessed October 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.