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Linear critical NTC thermistor thermometric element and its preparation process

A technology of negative temperature coefficient and thermistor, which is applied to thermometers, thermometers with directly heat-sensitive electric/magnetic elements, measuring devices, etc., can solve the problem that the low temperature range cannot be used, etc.

Active Publication Date: 2009-05-06
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention aims at the defect that the current point-type and distributed temperature-measuring elements cannot be used in the low temperature range, and provides a linear temperature-measuring element suitable for use in the temperature range of 250-500°C and a preparation method thereof

Method used

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  • Linear critical NTC thermistor thermometric element and its preparation process
  • Linear critical NTC thermistor thermometric element and its preparation process
  • Linear critical NTC thermistor thermometric element and its preparation process

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Prepare Ni first 2 o 3 -Cr 2 o 3 -Fe 2 o 3 -In 2 o 3 The heat-sensitive semiconducting ceramic powder of base, its composition is A in table 1; Add the kaolin of 5% quality in this ceramic powder again as binding agent, the cooked tung oil of 2% quality as lubricant and appropriate amount of water, Mix evenly, mix on a mixer or wheel mill for 1 hour, and extrude the material into a rod-shaped core with a diameter of 2mm after 8 hours of trapping. When extruding, a 0.2 mm stainless steel electrode wire, and then put the rod-shaped core body that penetrates the electrode wire in a resistance furnace, slowly heat it to 600 °C in the air and dry it for 0.5 hours to finalize the shape, put it into a stainless steel tube with a corresponding inner diameter, and finally put the The stainless steel tube of the rod-shaped core is cold-drawn three times and annealed at 550°C to finally obtain a negative temperature coefficient resistance linear temperature measuring elemen...

Embodiment 2

[0037] Prepare Ni first 2 o 3 -Cr 2 o 3 -Fe 2 o 3 -In 2 o 3 The heat-sensitive semiconducting ceramic powder based on the base is composed of B in Table 1, and the extruded diameter of the rod-shaped core is 2.5mm. 0.2mm stainless steel electrode wire, the rod-shaped core body inserted into the electrode wire was dried at 800°C for 1 hour to shape, the stainless steel tube equipped with the rod-shaped core body was cold-drawn four times, and the rest of the process was the same as in Example 1, and finally the outer diameter of stainless steel was obtained. 2mm negative temperature coefficient resistance linear temperature measuring element with high critical temperature.

Embodiment 3

[0039] Prepare Ni first 2 o 3 -Cr 2 o 3 -Fe 2 o 3 -In 2 o 3 The heat-sensitive semiconducting ceramic powder based on the base is composed of C in Table 1, and the diameter of the extruded rod-shaped core is 3mm. When extruding, two 0.3mm stainless steel electrode wire, and then dry the rod-shaped core body inserted into the electrode wire at 1000°C for 1 hour to finalize the shape, and the stainless steel tube equipped with the rod-shaped core body is cold-drawn 5 times, and the rest of the process is the same as in Example 1 to finally obtain the core body A negative temperature coefficient resistance linear temperature measuring element with a diameter of 2 mm and a high critical temperature.

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Abstract

The present invention discloses one kind of linear thermometric element in use temperature range of 250-500 deg.c and its preparation process. The preparation process includes the first preparation of Ni2O3-Cr2O3-Fe2O3-In2O3 based thermosensitive semiconductor ceramic powder, the subsequent adding adhesive and lubricant, extruding into rod while threading at least one axial electrode wire, drying at 600-1000 deg.c for 0.5-1 hr for setting, setting into metal tube, drawing for 3-5 times and annealing to obtain the linear thermometric element. The linear thermometric element has the electrode wire and the metal tube as two electrodes, and possesses high resistance at normal temperature and rapid lowering resistance at high temperature or in fire. With the temperature switch characteristic, the linear thermometric element may be used in temperature control, alarming and overheat protection.

Description

technical field [0001] The invention relates to a temperature sensor and a manufacturing method thereof, in particular to a critical negative temperature coefficient thermistor linear temperature measuring element and a manufacturing method thereof. Background technique [0002] The engine system and transmission system of various large and heavy-duty vehicles work in a harsh working environment. Various internal and external factors often cause fires in these parts due to excessive temperature. It is necessary to develop fire detection in the three-dimensional space of the engine And protect the temperature measuring element to ensure the safety of the equipment. However, due to the complex structure of the vehicle power system and the transmission space, the remaining space is tortuous and narrow, various point temperature measurement technologies, such as thermocouples, thermal resistors, ceramic thermistors, etc., can only measure the temperature in a narrow area, and ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K7/22
Inventor 高积强杨武杨建锋柯高潮梁森罗明
Owner XI AN JIAOTONG UNIV
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