Sintering Behavior and Microstructural Evaluation of MgO Doped Al2O3

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Özer A., Kumruoğlu L. C., Çelik M., Emircan Ç., Öksüz K. E.

18th International Conference Materials, Methods Technologies, Burgas, Bulgaristan, 26 - 30 Haziran 2016, cilt.10, ss.367-373

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Cilt numarası: 10
  • Basıldığı Şehir: Burgas
  • Basıldığı Ülke: Bulgaristan
  • Sayfa Sayıları: ss.367-373
  • Sivas Cumhuriyet Üniversitesi Adresli: Evet

Özet

There have been widespread interests in recent decades in porous ceramics owing to their specific

properties, such as low bulk density, low specific heat, low thermal conductivity and high specific

surface area. Alumina has been one of the first developed advanced ceramics to be used in load

bearing applications as orthopedic implants. The properties of α-Al2O3 can be modified by introducing

a second suitable metal oxide to form a composite oxide. Among various metal oxides MgO is

considered as a promising metal oxide which can modify the properties of alumina in the α-Al2O3-

MgO mixed oxides by grain growth inhibition due to the strong basic characteristics of MgO. In this

work, porous α-Al2O3 – MgO alumina-based ceramics were fabricated by a tape casting method and

powder metallurgy technique. MgO-doped α-Al2O3 ceramics sintered at 1400°C for 2-4-6 h in air

atmosphere. The effect of sintering time on the porosity, density and shrinkage properties of samples

were investigated. The sintering behavior, surface morphology, elemental distribution and phase

evaluation of the composite ceramics were evaluated by SEM-EDX and XRD, respectively.

Key words: α-Al2O3, porous ceramics, SEM-EDX, grain growth inhibition