Preparation and experimental characterization of glass-alumina functionally graded materials

Abstract This work aims at investigating the effects of the processing conditions on the final microstructure of glass–alumina functionally graded materials (FGMs). The ingredient materials, i.e. a polycrystalline sintered alumina and a CaO–ZrO 2 –SiO 2 glass, were accurately characterized, since their mechanical and thermal properties may deeply influence the fabricating process and the overall FGM behaviour. The functionally graded materials were obtained by means of percolation of the molten glass into the alumina substrate. Two types of samples were considered—the “Bulk” FGMs, produced starting from a glass bulk, and the “Powder” FGMs, produced starting from a glass powder; in both cases four different heating cycles were attempted. The functionally graded materials were analysed using a SEM-EDS and a X-ray diffractometer. Great attention was devoted to the resulting microstructure; moreover the depth of penetration was measured and related to the fabricating parameters, such as time and temperature.

[1]  C. Ponton,et al.  Vickers indentation fracture toughness test Part 1 Review of literature and formulation of standardised indentation toughness equations , 1989 .

[2]  C. Ponton,et al.  Vickers indentation fracture toughness test Part 2 Application and critical evaluation of standardised indentation toughness equations , 1989 .

[3]  Zdeněk Strnad,et al.  Glass ceramic materials , 1965 .

[4]  Yoshinari Miyamoto,et al.  Functionally Graded Materials. , 1995 .

[5]  G. Quinn,et al.  Journal of Research of the National Institute of Standards and Technology , 2002 .

[6]  Subra Suresh,et al.  Functionally graded metals and metal-ceramic composites: Part 1 Processing , 1995 .

[7]  C. Leonelli,et al.  Bulk Crystallization of Glasses Belonging to the Calcia—Zirconia—Silica System by Microwave Energy , 2004 .

[8]  Robert J. Asaro,et al.  A micromechanical study of residual stresses in functionally graded materials , 1997 .

[9]  V. Cannillo,et al.  Numerical Models of the Effect of Heterogeneity on the Behavior of Graded Materials , 2001 .

[10]  Subra Suresh,et al.  Engineering the resistance to sliding-contact damage through controlled gradients in elastic properties at contact surfaces , 1999 .

[11]  A. Sola,et al.  Computational simulations for the optimisation of the mechanical properties of alumina-glass Functionally Graded Materials , 2004 .

[12]  J. A. Pask,et al.  Penetration of Polycrystalline Alumina by Glass at High Temperatures , 1987 .

[13]  Subra Suresh,et al.  Functionally graded metals and metal-ceramic composites: Part 2 Thermomechanical behaviour , 1997 .

[14]  Yoshida Hideaki,et al.  Interaction between Alumina and Binary Glasses , 2005 .

[15]  Subra Suresh,et al.  Hertzian-crack suppression in ceramics with elastic-modulus-graded surfaces , 2005 .