D.N. Boccaccini

The development of microstructural damage in silicon carbide fibre (Nicalon™) reinforced glass matrix composite samples subjected to thermal shock was investigated by using a nondestructive forced resonance technique and fibre push out indentation tests. Thermal shock testing involved quenching samples in a water bath maintained at room temperature from a high temperature (650oC). Changes in the Young's modulus and internal friction of the samples with increasing number of shocks were measured accurately by the forced resonance technique. Fibre push-out tests showed no significant changes in the properties of the fibre-matrix interface, indicating that damage in the composite was concentrated mainly in the development of matrix microcracking. It was also shown that the internal friction is a very sensitive parameter by which to detect the onset and development of such microcracking. A simple semi-empirical model is proposed to correlate the internal friction level with the microcracking density in the glass matrix. Finally, the relevance of detecting nondestructively the existence of microcracks in the glass matrix, before any significant interfacial degradation occurs, is emphasized, in conextion with the possibility of inducing a crack healing process by a thermal treatment (annealing), taking advantage of the viscous flow properties of the glass.

10.3989/mc.1998.v48.i251.469

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Citations (3)

Assessment of viscoelastic crack bridging toughening in refractory materials

Journal of the European Ceramic Society (2008)

D.N. Boccaccini Maria Cannio T. D. Volkov‐Husoviæ Ivo Dlouhý Marcello Romagnoli

Thermal shock

Mullite

10.1016/j.jeurceramsoc.2008.01.021

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Citations (17)

Alkali-silica Glassy Matrixes (AGM ) as Replacement for Feldspar in Conventional Porcelain Compositions

Silicates industriels (2009)

Elie Kamseu Cristina Leonelli D.N. Boccaccini Paolo Veronesi Vincenzo M. Sglavo

The effect of alkali-silica glassy matrixes (AGM), as replacement for feldspar, on the microstructure, physical properties and mechanical strength of conventional porcelain has been studied. AGM with chemical composition similar to feldspars has been prepared to introduce alkali-ions (Na + and K + ) in porcelain compositions. It has been found that the replacement of feldspar by AGM ameliorates the mechanical properties of the material. The improvements are attributed to sharp changes in the microstructure as result of a reduction of glassy phase and increase in crystalline mullite amount. AGM were found to be promising candidates as substitutes for feldspar in conventional porcelain.

Mullite

Alkali feldspar

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Citations (1)

List of contributors

Elsevier eBooks (2021)

Teresa Alejo A.C. Bastos Andre Batako Jeremiah C. Beam Camillo Benetti

10.1016/b978-0-444-63240-1.00022-x

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Citations (0)

Study of thermal conductivity in refractory materials by means of a Guarded Hot Plate Apparatus", Milan, Italy, 11-15 December 2006, Abstract Book, p. 108 (2006).