ISSN: 1945-7553
CODEN: JTEVAB
Published Online: 23 September 2010
Page Count: 6

Pore Independent Crack Propagation of Glass-Alumina Functionally Graded Materials

Cheng-Long, Yu
School of Materials Science and Engineering, Shaanxi Univ. of Science and TechnologyResearch Laboratory of Hydrothermal Chemistry, Faculty of Science, Kochi Univ., Xi’anKochi,

Hong-Tao, Jiang
School of Materials Science and Engineering, Shaanxi Univ. of Science and Technology, Xi’an,

Li-Li, Wang
School of Materials Science and Engineering, Shaanxi Univ. of Science and Technology, Xi’an,

(Received 8 February 2010; accepted 8 August 2010)

Abstract

Crack propagation of glass-alumina functionally graded materials prepared by a novel freeform fabrication method was investigated. Pores were intentionally introduced by partial decomposition of poly vinyl alcohol gel. Preferential distribution of pores adjacent the alumina particles is confirmed due to the integrated liquid-phase sintering process, especially the migration of the activated alumina interfaces towards the equilibrium state. Crack propagation and distribution were directly observed by scanning electron microscopy. Cracks propagate through the weakly bonded interfaces which finally cause the glass matrix to fracture. However, pores have little effect on the crack propagation.

Keywords:
functionally graded materials, glass, alumina, cracks/cracking

Paper ID: JTE103037
DOI: 10.1520/JTE103037
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