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Deep low temperature oxide thermosensitive resistor material

A thermistor, oxide technology, applied in the direction of oxide conductors, resistors with negative temperature coefficient, non-metallic conductors, etc.

Inactive Publication Date: 2006-03-08
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Deep low-temperature NTC thermistors are widely used in low-temperature physics and low-temperature engineering. At present, there are only stereotyped products used at the temperature of liquid oxygen, liquid nitrogen, and liquid hydrogen. At present, there are no products used at lower temperatures, and the products Most of the materials are composite ceramic materials synthesized by doping and modifying transition metal elements with rare earth elements.

Method used

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  • Deep low temperature oxide thermosensitive resistor material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] a. First, weigh strontium oxide (produced by decomposing strontium carbonate at 900°C) with cobalt trioxide in a molar ratio of 1:1 to carry out direct solid-state reaction, grind in an agate mortar, grind and mix well, and then preheat at 800°C Sintered for 4 hours, pre-sintered and then ground into powder;

[0019] b. Add 10% starch solution to the prepared powder as a binder, use platinum wire as an electrode, and the distance between the two electrodes is 0.2mm, and the point beads are formed, and the size of the beads is 0.8mm; The beads were buried in a corundum crucible filled with analytically pure alumina powder, and sintered at a constant temperature of 1075°C for 6 hours to form porcelain; the sintered beads were spot-welded with a platinum wire electrode to the outer lead of the Dumet wire with a spot welder. Glass package, measure the parameters as the thermistor material, its B value is 35k, and the resistance value is 8Ω at 25°C.

Embodiment 2

[0021] a. First, weigh strontium oxide (produced by decomposing strontium carbonate at 900° C.) and nickel sesquioxide in a molar ratio of 1:1 to carry out direct solid-state reaction, grind in an agate mortar, grind and mix well, and then preheat at 850° C. Sintered for 6 hours, pre-sintered and then ground into powder;

[0022] b. Add 8% starch solution to the prepared powder as a binder, use platinum wire as an electrode, and the distance between the two electrodes is 0.1mm, and the point beads are formed, and the size of the beads is 1.0mm; The beads are buried in a corundum crucible filled with analytically pure alumina powder, and sintered at a high temperature of 1100°C for 4 hours to form porcelain; the sintered porcelain beads are spot-welded with a platinum wire electrode on the outer lead of the Dumet wire with a spot welder. Adopt glass encapsulation, measure the parameter as the thermistor material, its B value is at 35k, 25 ℃ resistance value is 0.5Ω.

Embodiment 3

[0024] a. First weigh strontium carbonate and dicobalt trioxide in a molar ratio of 1:1 and grind them in an agate mortar, grind and mix them evenly, then pre-sinter at 900°C for 4 hours, and then grind them into powder after pre-sintering;

[0025] b. Add 5% starch solution to the prepared powder as a binder, use platinum wire as an electrode, and the distance between the two electrodes is 0.2mm, and the point beads are formed, and the size of the beads is 1.2mm; The beads are buried in a corundum crucible filled with analytically pure alumina powder, and sintered at a high temperature of 1000°C for 6 hours to form porcelain; the sintered porcelain beads are spot-welded with a platinum wire electrode on the outer lead of the Dumet wire with a spot welder. Using glass package, measure the parameters as the thermistor material, its B value is 35k, and the resistance value is 50Ω at 25°C.

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Abstract

The material is nonstoichiometric oxide material in structure of perovskite SrCoO1-xNixO3-5 (delta is larger than and equal to 0, and less than and equal to 0.1, delta is larger than and equal to 0, and less than and equal to 0.5). Through testing shows that the disclosed material is comparable to approved products used under temperatures of liquid oxygen, liquid nitrogen or liquid hydrogen. Component parts obtained is operable at temperature 4.2K-20K. Advantages are: wide workable temperature region; cost is lowered since the disclosed material does not contain rare earth element.

Description

technical field [0001] The invention relates to a deep low temperature NTC oxide thermistor material widely used in aerospace engineering and low temperature technology. Background technique [0002] Deep low temperature negative temperature coefficient (NTC) thermistors are used for temperature measurement and control in aerospace engineering and low temperature science and technology. Currently commonly used sensors for low temperature measurement, control and liquid level indication include: platinum resistance thermometers, germanium resistance thermometers, helium Thermometer etc. However, platinum and germanium thermometers are greatly affected by the magnetic field, and gas thermometers cannot directly generate electrical signals and are not easy to be miniaturized. Oxide thermistors have the advantages of high sensitivity, small thermal inertia, low price, and little influence by magnetic fields. Therefore, oxide thermistors have a special statu...

Claims

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Application Information

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IPC IPC(8): H01C7/04H01B1/06H01B1/08
Inventor 兰玉歧妥万禄
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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