Phase studies of reactive infiltrated boron carbide-aluminium composites by quantitative XRD

Arslan G., KARA F., TURAN S.

7th Conference of the European Ceramic Society, Brugge, Belçika, 9 - 13 Eylül 2001, cilt.206-213, ss.759-762 identifier

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Cilt numarası: 206-213
  • Basıldığı Şehir: Brugge
  • Basıldığı Ülke: Belçika
  • Sayfa Sayıları: ss.759-762
  • Anahtar Kelimeler: Aluminium, Boron carbide, Infiltration, Quantitative XRD, Wetting
  • Anadolu Üniversitesi Adresli: Evet

Özet

Fully dense (> 98 % of theoretical) boron carbide (B4C)-aluminium (Al) composites were produced between 985° and 1370°C by pressureless melt infiltration of Al alloys into porous B4C compacts under an argon (Ar) atmosphere. Wrought Al alloy blocks (2024-T3) were put on top of the porous B4C compacts and infiltrated into the substrate in an atmosphere controlled tube furnace. Quantitative phase analysis by the ratio of slopes method showed that Al3BC and AlB2 were the main phases forming in the composites. The amounts of Al3BC and AlB2 varied between 30-65 wt % and 5-15 wt %, respectively, depending on the heat treatment. At temperatures exceeding 1180°C, a small amount of the boron rich AlB12C2 phase was also observed. The hygroscopic and undesired Al4C3 phase was found to form at 1370°C upon prolonged exposure.