High-temperature test fixture

1. A fixture suitable for testing electrical properties of a test sample at a high temperature, said fixture comprising:

at least three noble metal electrodes arranged in parallel, among which two adjacent noble metal electrodes are used for clamping the test sample;

noble metal wires connected to the noble metal electrodes at one end, and to a test device at the other end for transmitting test signals generated by the test sample to the test device through the noble metal electrodes; and

a thermocouple for measuring the temperature of the test sample.

2. The fixture of claim 1 , wherein the noble metal electrodes comprise a first electrode, a second electrode and at least one third shared electrode; and

wherein the first electrode and the at least one third shared electrode are arranged to be movable in a direction perpendicular to the noble metal electrodes so that the distance between each of the noble metal electrodes is adjustable.

3. The fixture of claim 2 , wherein said fixture further comprises a protection tube surrounding a first wire that is connected to the first electrode, the protection tube is movable in a direction perpendicular to the noble metal electrodes, and the first electrode is provided at the end surface of the protection tube.

4. The fixture of claim 3 , wherein said fixture further comprises a frame-shaped bracket having an opening, and wherein the noble metal electrodes extend toward the opening.

5. The fixture of claim 4 , wherein said fixture further comprises an electrode holder for supporting the second electrode and the third shared electrode, the electrode holder is fixed to the frame-shaped bracket, and configured to extend in a direction perpendicular to the noble metal electrodes, and the second electrode is fixed at one end of the electrode holder, and wherein the electrode holder further comprises a sliding slot, in which an end of the third shared electrode is slidably accommodated so that the third shared electrode is movable in a direction perpendicular to the noble metal electrodes.

6. The fixture of claim 5 , wherein said fixture further comprises a first wire bracket fixed to the frame-shaped bracket for supporting the noble metal wires, the thermocouple, and the protection tube, and wherein the first wire bracket has a plurality of through-holes corresponding to the noble metal wires, the thermocouple, and the protection tube, respectively.

7. The fixture of claim 6 , wherein said fixture further comprises a second wire bracket fixed to said electrode holder, and wherein said second wire bracket has a plurality of through-holes corresponding to the thermocouple, and at least one of a second wire connected to the second electrode, and a third wire connected to the third shared electrode.

8. The fixture of claim 6 , wherein the fixture further comprises a spring, one end of which is connected to the first wire bracket and the other end of which is connected to the protection tube.

9. The fixture of claim 1 , wherein the material of at least one of the noble metal electrodes and the noble metal wires is platinum or iridium.

10. The fixture of claim 1 , wherein the thermocouple is of S-type, B-type, or made of tungsten-rhenium.

11. The fixture of claim 7 , wherein at least one of the protection tube, the frame-shaped bracket, the electrode holder, the first wire bracket, and the second wire bracket is made of high-temperature resistant insulating ceramics.

12. The fixture of claim 11 , wherein said high-temperature resistant insulating ceramics include alumina ceramics and zirconia ceramics.