Composite material for temperature measurement, temperature sensor comprising the composite material, and method for producing the composite material and the temperature sensor
A composite material 1 for temperature measurement is specified, as is a temperature sensor 10 formed from the composite material 1 . Additionally specified are processes for producing the composite material 1 and for producing the temperature sensor 10.
1. A temperature sensor comprising a composite material for temperature measurement, wherein the composite material comprises:
a pulverulent ceramic filler comprising an electrically conductive spinel of the formula A II B III 2 O 4 or perovskite of the formula ABO 3 where A and B are each metals; and
a formable matrix which embeds the filler, wherein the matrix comprises a material selected from a group consisting of glass-like materials, thermoplastic thermosets, elastomers, and mixtures thereof;
wherein the ceramic filler has a positive or negative temperature coefficient of electrical resistance, and the composite material has a resistance-temperature characteristic determined by the ceramic filler,
wherein the temperature sensor is in the form of a film, and
wherein the film is flexible.
2. The temperature sensor as claimed in claim 1 , wherein the filler is present as a multitude of particles in the matrix.
3. The temperature sensor as claimed in claim 2 , wherein the particles have a filling level in the matrix of 50% to 95%.
4. The temperature sensor as claimed in claim 2 , wherein the particles form continuous current paths in the matrix.
5. The temperature sensor as claimed in claim 1 having contacts.
6. The temperature sensor as claimed in claim 5 , wherein the contacts are applied on the surface of the temperature sensor and/or integrated into the temperature sensor.
7. A process for producing the temperature sensor claimed in claim 1 and having contacts, comprising the steps of:
A. producing the composite material by a process comprising the steps of:
i. producing the ceramic filler,
ii. providing the matrix, and
iii. mixing the filler and the matrix;
B. forming the composite material; and
C. applying the contacts.
8. A temperature sensor comprising a composite material for temperature measurement, the composite material comprising:
a pulverulent ceramic filler comprising an electrically conductive spinel of the formula A II B III 2 O 4 or perovskite of the formula ABO 3 where A and B are each metals; and
a formable matrix which embeds the filler, wherein the matrix comprises a material selected from a group consisting of glass-like materials, thermoplastics, thermosets, elastomers, and mixtures thereof;
wherein the ceramic filler has a positive or negative temperature coefficient of electrical resistance, and the composite material has a resistance-temperature characteristic determined by the ceramic filler,
wherein the filler is present as a multitude of particles in the matrix, and
wherein the particles have a filling level in the matrix of 50% to 95%
wherein the temperature sensor is in the form of a film, and
wherein the film is flexible.
9. A process for producing a temperature sensor as claimed in claim 8 , comprising the process steps of:
A) producing the ceramic filler;
B) providing the matrix; and
C) mixing the filler and the matrix.
10. The temperature sensor as claimed in claim 8 and having contacts.
11. A process for producing the temperature sensor claimed in claim 8 and having contacts, comprising the steps of:
A. producing the composite material by a process comprising the steps of:
i. producing the ceramic filler,
ii. providing the matrix, and
iii. mixing the filler and the matrix;
B. forming the composite material; and
C. applying the contacts.