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Preparation and characterization of alumina-doped powders for the design of multi-phasic nano-microcomposites

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Abstract

The composite powders 90 vol.% Al2O3–5 vol.% YAG–5 vol.% ZrO2 were produced by doping commercial alumina powders with zirconium and yttrium chloride aqueous solutions. Both a nanocrystalline transition alumina and a pure α-phase powder were used as starting materials. The obtained materials were characterized by DTA-TG, XRD and dilatometric analyses and compared to the respective biphasic systems developed by the same procedure. Pressureless sintering at 1500 °C for 3 h was able to consolidate the doped powders in fully dense bodies, characterized by a very fine and homogeneous dispersion of the second phases into the micronic alumina matrix.

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Abbreviations

T-A:

α-alumina (TM-DAR Taimicron)

N-A:

Nanocrystalline transition alumina (NanoTek®)

T-AZ5:

95 vol.% Al2O3–5 vol.% YAG obtained from T-A doping

T-AY5:

95 vol.% Al2O3–5 vol.% YAG obtained from T-A doping

N-AY5:

95 vol.% Al2O3–5 vol.% YAG obtained from N-A doping

N-AY10:

90 vol.% Al2O3–10 vol.% YAG obtained from N-A doping

N-AY20:

80 vol.% Al2O3–20 vol.% YAG obtained from N-A doping

T-AYZ:

90 vol.% Al2O3–5 vol.% YAG–5 vol.% ZrO2 obtained from T-A doping

N-AYZ:

90 vol.% Al2O3–5 vol.% YAG–5 vol.% ZrO2 obtained from N-A doping

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Authors and Affiliations

  1. Department of Material Science and Chemical Engineering – Politecnico di Torino, INSTM Research Unit – LINCE Lab., Corso Duca degli Abruzzi 24, 10129, Torino, Italy

    V. Naglieri, P. Palmero & L. Montanaro

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  1. V. Naglieri
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  2. P. Palmero
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  3. L. Montanaro
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Correspondence to V. Naglieri.

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Naglieri, V., Palmero, P. & Montanaro, L. Preparation and characterization of alumina-doped powders for the design of multi-phasic nano-microcomposites. J Therm Anal Calorim 97, 231–237 (2009). https://doi.org/10.1007/s10973-009-0261-7

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