Mechanical synthesis and rapid consolidation of nanocrystalline TiCo-Al2O3 composites by high frequency induction heated sintering
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Despite of many attractive properties of TiCo, TiCo in industry has been limited due to low fracture toughness and a lowhardness. The mechanical properties can be improved significantly by reinforcing TiCo with hard ceramic particles such asAl2O3 and by fabrication of nanostructured composite. Nanomaterials have received a good deal of attention recently as theypossess high strength, high hardness, excellent ductility and toughness. In recent days, nanocrystalline powders have beendeveloped by the thermochemical and thermomechanical process named as the spray conversion process (SCP), coprecipitationand high energy milling. Nano-powders of TiCo and Al2O3 were synthesized from CoTiO3 and 2Al powders byhigh energy ball milling. Nanocrystalline Al2O3 reinforced composite was consolidated by high frequency induction heatedsintering within one minute from mechanochemically synthesized powders of Al2O3 and TiCo. The relative density of thecomposite was 98%. The average hardness and fracture toughness values obtained were 1180 kg/mm2and 8.5 MPa·m1/2,respectively.
Abstract
Despite of many attractive properties of TiCo, TiCo in industry has been limited due to low fracture toughness and a lowhardness. The mechanical properties can be improved significantly by reinforcing TiCo with hard ceramic particles such asAl2O3 and by fabrication of nanostructured composite. Nanomaterials have received a good deal of attention recently as theypossess high strength, high hardness, excellent ductility and toughness. In recent days, nanocrystalline powders have beendeveloped by the thermochemical and thermomechanical process named as the spray conversion process (SCP), coprecipitationand high energy milling. Nano-powders of TiCo and Al2O3 were synthesized from CoTiO3 and 2Al powders byhigh energy ball milling. Nanocrystalline Al2O3 reinforced composite was consolidated by high frequency induction heatedsintering within one minute from mechanochemically synthesized powders of Al2O3 and TiCo. The relative density of thecomposite was 98%. The average hardness and fracture toughness values obtained were 1180 kg/mm2and 8.5 MPa·m1/2,respectively.
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