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Alumina-Based Functional Materials Hardened with Al or Ti and Al-nitride or Ti-nitride Dispersions

Published online by Cambridge University Press:  01 February 2011

José G. Miranda-Hernández ,
Elizabeth Refugio-Garcia ,
Elizabeth Garfias-García  and
Enrique Rocha-Rangel
José G. Miranda-Hernández
Affiliation:
Departamento de Materiales, Universidad Autónoma Metropolitana Av. San Pablo No. 180, Col. Reynosa-Tamaulipas, México, D. F., 02200.
Elizabeth Refugio-Garcia
Affiliation:
Departamento de Materiales, Universidad Autónoma Metropolitana Av. San Pablo No. 180, Col. Reynosa-Tamaulipas, México, D. F., 02200.
Elizabeth Garfias-García
Affiliation:
Departamento de Materiales, Universidad Autónoma Metropolitana Av. San Pablo No. 180, Col. Reynosa-Tamaulipas, México, D. F., 02200.
Enrique Rocha-Rangel
Affiliation:
Universidad Politécnica de Victoria, Avenida Nuevas Tecnologías 5902, Parque Científico y Tecnológico de Tamaulipas, Ciudad Victoria, Tamaulipas, 87137, México
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Abstract

The synthesis of Al2O3-based functional materials having 10 vol. % of fine aluminum or titanium and aluminum-disperse or titanium-dispersed nitride hardened-particles has been explored. Two experimental steps have been set for the synthesis; specifically, sintering of Al2O3-aluminum or Al2O3-titanium powders which were thoroughly mixed under high energy ball-milling, pressureless-sintered at 1400°C during 1 h in argon atmosphere and then for the second step it was induced formation of aluminum nitride or titanium nitride at 500°C during different times (24, 72 and 120 h) by a nitriding process via immersion in ammoniac salts. SEM analyses of the microstructures obtained in nitride bodies were performed in order to know the effect of the ammoniac salts used as nitrating on the microstructure of aluminum or titanium for each studied functional material. It was observed that an aluminum nitride or titanium nitride layer growth from the surface into the bulk and reaches different depth as the nitriding time of the functional material was increased. The use of aluminum or titanium significantly enhanced density level and hardness of the functional materials.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1276: Advanced Structural Materials–2010 , 2010 , 28
Copyright
Copyright © Materials Research Society 2010

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