Articles written in Bulletin of Materials Science
Volume 18 Issue 7 November 1995 pp 831-843
The inorganic content of human tooth is predominantly hydroxyapatite. The content varies in enamel and dentin. A reversible thermal transformation at 157 C is observed and has correspondence in the dielectric measurements. The dental decay is related to the piezoelectric property of tooth, which is similar to a polar glassceramic. The toughness of tooth is higher than hotpressed hydroxyapatite and owes it to the microstructure signifying the importance of a weak, pliable interface. The hardness is graded, higher for enamel in the crown and very much lower for dentin, to suit their function and environment. The relevance of biomimics in designing materials for advanced performance is discussed.
Volume 18 Issue 7 November 1995 pp 845-856
Alumina-glassceramic composites show good densification and uniformly distributed fine-sized particle microstructure owing to the liquid phase of the glassceramic at the sintering temperatures. The flexure strength decreases with increase in the glassceramic content. This is attributed to the dissolution of alumina at the interface resulting in a changed crystalline phase, glass coating around the matrix grains and the difference in thermal expansion. These aspects have been confirmed through expansion coefficient measurements.
Volume 19 Issue 5 October 1996 pp 749-758
Impact tests were carried out on five glassceramics tiles. The ballistic resistance was evaluated by the depth of penetration of the projectile into the backing. The fragmentation behaviour of the glassceramics showed that the glassceramics compared with with alumina and displayed some advantages over it.
Volume 44, 2021
Continuous Article Publishing mode
Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020
Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020
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