Bonding of WC with an iron aluminide (FeAl) intermetallic

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FeAl, which has high oxidation and sulfidation resistance, was shown to be thermodynamically compatible with WC. Calculations indicate that soly. of WC in liq. Fe-40at.%Al at 1450 C is about 2 at.%. Since liquid FeAl wets WC very well, the WC/FeAl system lends itself to liquid-phase sintering, resulting in close to theoretical densities. Almost fully dense cermets with 20.6 wt% FeAl binder were produced. With one-step infiltration, 98% dense cermets with only 7 wt% FeAl binder were fabricated. RT bend strengths and fracture toughness for WC-20.6 wt% FeAl reached 1680 MPa and 22 MPa{center_dot}m{sup 1/2}. Ductile binder fracture was observed ... continued below

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10 p.

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Schneibel, J. H. & Subramanian, R. August 1, 1996.

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Description

FeAl, which has high oxidation and sulfidation resistance, was shown to be thermodynamically compatible with WC. Calculations indicate that soly. of WC in liq. Fe-40at.%Al at 1450 C is about 2 at.%. Since liquid FeAl wets WC very well, the WC/FeAl system lends itself to liquid-phase sintering, resulting in close to theoretical densities. Almost fully dense cermets with 20.6 wt% FeAl binder were produced. With one-step infiltration, 98% dense cermets with only 7 wt% FeAl binder were fabricated. RT bend strengths and fracture toughness for WC-20.6 wt% FeAl reached 1680 MPa and 22 MPa{center_dot}m{sup 1/2}. Ductile binder fracture was observed on the fracture surfaces. Pores containing oxide inclusions were found, suggesting that improvements in processing are likely to further improve the mechanical properties. Insufficient process control may explain why WC/FeAlNi cermets did not show improved mechanical properties, although Ni strengthens FeAl. For WC bonded with FeAl, mechanical properties were measured at RT and 800 C. Bend strengths at 800 C in air increased with WC volume fraction, and fracture toughness were higher than at RT.

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10 p.

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OSTI as DE96013783

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  • 1996 world congress on powder metallurgy and particulate materials, Washington, DC (United States), 16-21 Jun 1996

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  • Other: DE96013783
  • Report No.: CONF-9606260--1
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 372664
  • Archival Resource Key: ark:/67531/metadc685871

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • August 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Oct. 3, 2017, 1:05 p.m.

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Schneibel, J. H. & Subramanian, R. Bonding of WC with an iron aluminide (FeAl) intermetallic, article, August 1, 1996; Tennessee. (digital.library.unt.edu/ark:/67531/metadc685871/: accessed April 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.