PTC thermistor member
AssigneeNational University Corporation Nagoya University
InventorsYoshihiko Ishida, Naoyuki Kanetake, Makoto Kobashi
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Abstract
A PTC thermistor device has a PTC thermistor member and electrodes. The electrodes, are formed on respective surfaces of the PTC thermistor member. The PTC thermistor member contains a matrix phase, and conductive particles dispersed throughout the matrix phase. The matrix phase contains an electrically insulating first inorganic material and an electrically insulating second inorganic material. The first inorganic material undergoes phase transition in terms of crystal structure type and change in volume, at the phase transition temperature thereof. The second inorganic material is fibrous.
Claims20
A positive temperature coefficient of resistance (PTC) thermistor member, comprising:
- a matrix phase;
- and
- conductive particles dispersed throughout the matrix phase,
- wherein the matrix phase comprises an electrically insulating first inorganic material and an electrically insulating second inorganic material,
- wherein the first inorganic material undergoes phase transition in terms of crystal structure type and change in volume, at a phase transition temperature thereof,
- wherein the first inorganic material comprises at least one material selected from among cristobalite-form silicon dioxide, tridymite-form silicon dioxide, cristobalite-form aluminum phosphate, tridymite-form aluminum phosphate, and carnegiette,
- wherein the second inorganic material is fibrous, and
- wherein the second inorganic material has a fiber length of 50 μm to 1000 μm.
A positive temperature coefficient of resistance (PTC) thermistor member, comprising:
- a matrix phase;
- and
- conductive particles dispersed throughout the matrix phase,
- wherein the matrix phase comprises an electrically insulating first inorganic material and an electrically insulating second inorganic material,
- wherein the first inorganic material undergoes phase transition in terms of crystal structure type and change in volume, at a phase transition temperature thereof,
- wherein the first inorganic material comprises at least one material selected from among cristobalite-form silicon dioxide, tridymite-form silicon dioxide, cristobalite-form aluminum phosphate, tridymite-form aluminum phosphate, and carnegieite,
- wherein the second inorganic material is fibrous, and
- wherein the second inorganic material has a mean fiber diameter of 1 μm to 10 μm.
Dependencies are inferred from the claim text.