INFLUENCE OF ELECTRODE GEOMETRY ON THE TEMPERATURE STRESSES IN PTC THERMORESISTORS AT CURRENT LOADINGS
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Abstract
Temperature stresses in barium-titanate-based thermoresistors in the process of heating by electric current have been investigated by numerical methods. It is shown that by optimizing the electrode design one can decrease temperature gradients and temperature stresses in ceramics. When the electrode radius is less than radius of ceramic element on 200 microns, temperature stresses decrease from 80 to 60 MPa. It allows to reduce probability of mechanical failure of PTC thermistors.
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References
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