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The fracture mechanisms of a metal/silicon nitride interface, have been investigated. The interface was formed via diffusion bonding Si(3)N(4) ceramics with thin Fe foils as the joining interlayer. Four point bend specimens that were pre-cracked at the interface have been used to measure the interfacial fracture toughness. An appropriately designed bending jig has been used that allows for a wide range of loading modes at the crack tip. Calibration functions of the test specimen, which describe the influence of the geometry and material properties on the mode variations were calculated by means of a finite element method. The effects of metal interlayer thickness and pre-crack length have been studied and the fracture toughness of the joint was compared to the one of the monolithic ceramic. The fracture surfaces of the joints have been characterised and correlated with the results.

Additional information

Authors: STAMOS V, JRC Petten (NL);PETEVES S D, JRC Petten (NL)
Bibliographic Reference: Paper presented: COMP '95 Symposium, Patras (GR), September 18-22, 1995
Availability: Available from (1) as paper EN 39373 ORA
Record Number: 199511544 / Last updated on: 1995-12-12
Original language: en
Available languages: en