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Fe-TiC/N Ceramic-Metal Composites

  • I. W. M. Brown
  • G. V. White
  • G. L. Dunlop
Chapter

Abstract

A fine powder consisting of iron metal and titanium carbide or nitride can be obtained by reduction of the mineral ilmenite (FeTiO3) with carbon under controlled atmospheres. Hot-pressing of Fe-TiC powder causes transformation of ≈ 80% of the α-Fe to Fe3C, whereas for Fe-TiN powder the extent of transformation to Fe3C is very minor. The densification process is controlled by the extent to which the ceramic is wetted by the metal matrix and has been found to be very different between TiN and TiC-based systems. Microstructural examination of these specimens shows retention of sharp (cubic) TiN grain boundaries in Fe-TiN whereas the TiC grains in Fe-TiC are heavily rounded. Physical property measurements for hot-pressed specimens show that density and hardness increase with temperature while porosity reduces to zero by ≈ 1330°C for Fe-TiN and ≈ 1530°C for Fe-TiC. Vickers hardness values of ≈ 1100 and ≈ 1380 are obtained for fully dense specimens of Fe-TiN and Fe-TiC respectively.

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References

  1. 1.
    Ellis, J.L., Carbides that are weldable, machinable and heat treatable. The Tool Engineer, April 1957, 103–105.Google Scholar
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    Lehuy, H., Cliche, G. and Dallaire, S., Synthesis and chara~terisation of Ti(C,N)-Fe cermets produced by direct reaction. Materials Science and Engineering, 1990, A125, L11–L14.CrossRefGoogle Scholar
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    Von Holst, J.P. and Oskarsson, R.G., Compound body and method of making the same. US Patent 4,618,540, 1986.Google Scholar

Copyright information

© Elsevier Science Publishers Ltd and MPA Stuttgart 1992

Authors and Affiliations

  • I. W. M. Brown
    • 1
  • G. V. White
    • 1
  • G. L. Dunlop
    • 2
  1. 1.DSIR ChemistryLower HuttNew Zealand
  2. 2.University of QueenslandBrisbaneAustralia

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