Self-propagating high-temperature synthesis of ZrB2 or TiB2 reinforced Ni-Al composite powder

ÇAMURLU H. E., MAGLIA F.

JOURNAL OF ALLOYS AND COMPOUNDS, cilt.478, sa.1-2, ss.721-725, 2009 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 478 Sayı: 1-2
  • Basım Tarihi: 2009
  • Doi Numarası: 10.1016/j.jallcom.2008.11.139
  • Dergi Adı: JOURNAL OF ALLOYS AND COMPOUNDS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.721-725
  • Anahtar Kelimeler: Coating materials, Composite materials, Inorganic materials, Chemical synthesis, Scanning electron microscopy, SEM, COMBUSTION SYNTHESIS, MECHANICAL-PROPERTIES, SHS, MICROSTRUCTURE, FABRICATION, PARAMETERS, BEHAVIOR
  • Akdeniz Üniversitesi Adresli: Evet

Özet

The self-propagating high-temperature synthesis (SHS) of 0-40 wt.% ZrB2 or 40 wt.% TiB2 reinforced Ni-Al matrix composite powders has been investigated. The SHS reactions were conducted starting from elemental powders of Zr, Ti, Ni, Al, and amorphous B. For all initial compositions, the product contained only the NiAl and ZrB2 or TiB2 compounds without any trace of cross-reaction phases. The powder, obtained by grinding the reacted pellet, contained ZrB2 or TiB2 homogeneously dispersed in the NiAl matrix. The dimension and distribution of the reinforcement phase make the powder suitable as precursor for thermal spray applications. After sintering of the composite powder up to 85% of theoretical density, microhardness was measured. The microhardness of pure NiAl was 394 +/- 37 HV0.2. It increased considerably by the addition of the boride phases. Samples containing 40 wt.% ZrB2 and TiB2 attained values of 812 +/- 94 and 967 +/- 104 HV0.2, respectively. (C) 2008 Elsevier B.V. All rights reserved.

The self-propagating high-temperature synthesis (SHS) of 0-40 wt.% ZrB2 or 40 wt.% TiB2 reinforced Ni-Al matrix composite powders has been investigated. The SHS reactions were conducted starting from elemental powders of Zr, Ti, Ni, Al, and amorphous B. For all initial compositions, the product contained only the NiAl and ZrB2 or TiB2 compounds without any trace of cross-reaction phases. The powder, obtained by grinding the reacted pellet, contained ZrB2 or TiB2 homogeneously dispersed in the NiAl matrix. The dimension and distribution of the reinforcement phase make the powder suitable as precursor for thermal spray applications. After sintering of the composite powder up to 85% of theoretical density, microhardness was measured. The microhardness of pure NiAl was 394 +/- 37 HV0.2. It increased considerably by the addition of the boride phases. Samples containing 40 wt.% ZrB2 and TiB2 attained values of 812 +/- 94 and 967 +/- 104 HV0.2, respectively. (C) 2008 Elsevier B.V. All rights reserved.