HITECA: High temperature capacitor
NPL has developed and now holds a patent for a new ceramic capacitor dielectric material that operates with a stable capacitance at temperatures of 200 °C and above.
This new material, called HITECA, overcomes the limitations of currently available capacitors, which are restricted to operating at temperatures around 150 °C. This has, until now, constrained the development of high temperature electronics such as those used for power conversion in electric and hybrid vehicles.
HITECA also has potential for other areas of high temperature electronics within the aerospace, power generation and oil and gas sectors, as well as for high energy applications such as pulsed power - where energy is stored over a period of time before being released as a high power 'pulse'.
- Pulsed power
- Harsh enviroments
- Renewable energy
- Integrated circuits
|Material||Operating Temperature Range||Dielectric Constant||DF ||TCC* (%)||VCC** (%)|
|C0G||-55 to 125 °C||10 - 100||0.1 %||0.3 % (-55 to 125 °C)||0|
|X7R||-55 to 125 °C||2000 - 4000||3.5 %||+/-15 % (-55 to 125 °C)||< 80 % (at 25 °C)|
|Y5V||-55 to 125 °C||> 16000||9 %||< 82 % (-30 % to 85 °C)||> 90 % (at 25 °C)|
|HITECA||-55 to 200 °C||> 1200||0.3 %||+/-10 % (-55 to 200 °C)||< 50 % (at 25 °C)|
*TCC - temperature capacitance change
**VCC - voltage capacitance change
- Increasing recoverable energy storage in electroceramic capacitors using 'dead-layer' engineering
M. McMillen, A. M. Douglas, T. M. Correia, P. M. Weaver, M. G. Cain, and J. M. Gregg
Applied Physics Letters101, 242909 (2012)
This work was co-funded by Technology Strategy Board's Low Carbon Vehicles programme and the National Measurement Office. Partners include Syfer, NanoForce, Valeo, Queen Mary, University of London and Queen's University Belfast.
For more information, please contact Paul Weaver
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