Ceramic nanocomposites for high temperature, sensor and bio-applications

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

The target of this research was to work out new methods for preparing synergistic ceramic matrix composites with new structural and functional properties. Primarily the interactions between silicon nitride matrix and graphite micrograins, carbon black nanograins, carbon fibres and carbon nanotubes were investigated. Carbon nanotubes present exceptional mechanical, superior thermal and electrical properties, therefore there are high expectations for improvement of quality of nanotube added nanocomposites. Our experimental work has been performed to control the preparation of colloidal ceramic slurry and the structural changes during shaping and sintering. Several sintering techniques PLS (Pressureless Sintering), HIP (Hot Isostatic Pressing), HP (Hot Pressing), FAST (Field Activated Sintering) were applied. Structural, morphological and mechanical properties were examined to follow the interactions between ceramic matrix and different carbon additions. The development of gas sensing devices and their arrays based on open structured and nanostructured tungsten oxides will be also presented. In the beginning the work was concentrating on the preparation processes of new polymorphs of tungsten oxide, in bulk and thin film form. The target is to develop advanced gas sensors for high temperature applications. The cubic and hexagonal tungsten oxides have been found to be sensitive to NH3 and NO2 gases. Our further aim was to develop composite materials for biomedical applications. In the first stage hydroxyapatite and calcium phosphate powders were prepared; the size of grains was in the nano and micro region. A new method has been worked out for covering hydroxyapatite substrate by calcium phosphate nano and micro layers or fibres. A layered structure of this type may increase the strength of composite. In the next step different porous ceramics and layers will be prepared and examined to improve both the bio-compatibility and strength.

Original languageEnglish
Title of host publicationNanocomposites
Subtitle of host publicationPreparation, Properties and Performance
PublisherNova Science Publishers, Inc.
Pages187-209
Number of pages23
ISBN (Print)9781604567984
Publication statusPublished - Apr 1 2008

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Materials Science(all)

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  • Cite this

    Balázsi, C. (2008). Ceramic nanocomposites for high temperature, sensor and bio-applications. In Nanocomposites: Preparation, Properties and Performance (pp. 187-209). Nova Science Publishers, Inc..