Effect of composition on the processing and properties of sintered reaction-bonded silicon nitride

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Description

The type of silicon powder and sintering additive were found to influence the processing and final mechanical properties of sintered reaction bonded silicon nitride. High purity silicon powders produced low {alpha}-Si{sub 3}N{sub 4} content during nitridation. The Si powder type had no apparent effect on densification. More complete nitridation and higher room temperature mechanical properties were observed for the Si powders with higher Fe contents. However, the higher Fe contents resulted in greater high temperature strength degradation and so there was better high temperature strength retention with the higher purity Si. High {alpha}-Si{sub 3}N{sub 4} contents were found after nitridation ... continued below

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9 p.

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Tiegs, T.N.; Kiggans, J.O.; Montgomery, F.C.; Lin, H.T.; Barker, D.L.; Snodgrass, J.D. et al. April 1, 1996.

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Description

The type of silicon powder and sintering additive were found to influence the processing and final mechanical properties of sintered reaction bonded silicon nitride. High purity silicon powders produced low {alpha}-Si{sub 3}N{sub 4} content during nitridation. The Si powder type had no apparent effect on densification. More complete nitridation and higher room temperature mechanical properties were observed for the Si powders with higher Fe contents. However, the higher Fe contents resulted in greater high temperature strength degradation and so there was better high temperature strength retention with the higher purity Si. High {alpha}-Si{sub 3}N{sub 4} contents were found after nitridation with {alpha}-Si{sub 3}N{sub 4} seeded materials and with MgO-Y{sub 2}O{sub 3} as the sintering additive. Densification was inhibited by refractory additives, such as Y{sub 2}O{sub 3}-SiO{sub 2}. The highest room temperature strength and fracture toughness values correlated to high nitrided {alpha}-Si{sub 3}N{sub 4} contents. The high temperature strength behavior was similar for all additive types.

Physical Description

9 p.

Notes

OSTI as DE96008095

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  • 20. annual conference on composites, advanced ceramics, materials and structures-B, Cocoa Beach, FL (United States), 7-11 Jan 1996

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  • Other: DE96008095
  • Report No.: CONF-960106--5
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/219390 | External Link
  • Office of Scientific & Technical Information Report Number: 219390
  • Archival Resource Key: ark:/67531/metadc666498

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  • April 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • Jan. 19, 2016, 12:55 p.m.

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Tiegs, T.N.; Kiggans, J.O.; Montgomery, F.C.; Lin, H.T.; Barker, D.L.; Snodgrass, J.D. et al. Effect of composition on the processing and properties of sintered reaction-bonded silicon nitride, report, April 1, 1996; Tennessee. (digital.library.unt.edu/ark:/67531/metadc666498/: accessed September 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.