ISSN 0004-881X

Synthesis of Ca₃Co₄O₉ and CuAlO₂ Ceramics of the Thermoelectric Application Using A Reaction- Sintering Process

by Y. C. Liou, W. C. Tsai, W. Y. Lin, U. R. Lee
Department of Electronic Engineering, Kun Shan University, Tainan 71003, Taiwan, R.O.C.

Abstract

In order to develop a technique whereby a precrack can be introduced to CT specimens made from brittle materials, experiments were carried out using glass CT specimens. The precracks were introduced using a technique where the length of the precrack can be controlled by utilizing the frictional force occurring at the surface of the CT specimen under local compression. Frictional force is applied to the contact surface of the CT specimen which is stacked between two loading blocks, by the difference in Young`s modulus of the CT specimen and the loading blocks. Characteristics of this technique are that the precrack is almost straight plus it`s length is controllable. The fracture toughness values of the glass CT specimens were also examined in the experiments. It was shown that fracture toughness values show not only good reproducibility but are also within the range of expected values for the glass.

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