PTCR component is also called PTCR thermistor ceramics, and it is a kind of semiconductor functional ceramics with positive temperature coefficient. For PTCR, before transformation temperature, the resistance drops as the rise of temperature, the temperature is between the transformation temperature and thermal runaway temperature, and the resistance valve increases obviously as the rise of temperature. PTCR component has some advantages that are incomparable by traditional electrical heating element: constant temperature heating, long natural service life, energy conservation, no open flame, good safety performance, convenient adjustment of heating value, small impact by power voltage. Now PTCR component has been widely applied to such fields like home appliance, power facilities, electronic equipment and automotive industry, etc.