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Study of Life Prediction and Failure Mechanisms of Cramic Heater for Home Appliance  

Choi, Hyoungseuk (Conversions R&D Division, Simulation Team, Korea Institute of Ceramic Engineering and Technology)
Publication Information
Journal of Applied Reliability / v.17, no.4, 2017 , pp. 355-361 More about this Journal
Abstract
Purpose: The purpose of this research is to establish the life test method for ceramic heater and identify the failure mechanisms. Methods: We do accelerated life test in the condition of thermal shock and failure analysis for failed samples. Conclusion: The main failure mechanisms of ceramic heater are identified as overstress failure mechanisms as results of failure analysis and the shape parameters of weibull distribution by accelerated life test are identified as 0.8, 1.2 and 0.4 each at $400^{\circ}C$, $600^{\circ}C$ and $900^{\circ}C$. At $900^{\circ}C$, the shape parameter 0.4 means that It is exactly initial failure caused that the stress exceeds the strength of ceramic heater highly and the shape parameters 0.8, 1.2 at $400^{\circ}C$, $600^{\circ}C$ means that the shape parameters are around 1.0 so that the main failure mechanism is overstress failure which is same result as failure analysis. It means that the appropriate life test method for ceramic heater is reliability qualification test method rather than accelerated life test.
Keywords
Ceramic; Heater; Overstress Failure Mechanism; Thermal Shock;
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