Thermistor element manufacturing method and thermistor element
A thermistor element and manufacturing method technology, applied to thermistors, resistors with negative temperature coefficients, etc., can solve the problems of increased cracks, insufficient reliability, increased resistance value, etc., to achieve crack suppression, high Uniform resistance value deviation, effect of suppressing resistance value deviation
Inactive Publication Date: 2013-01-02
MITSUBISHI MATERIALS CORP
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Problems solved by technology
[0015] Thus, in the initial state, when there is a crack 1a in the insertion port and the sintered body 1 is warped, due to the difference in thermal expansion between the sintered body 1 and the lead wire 2, due to the thermal cycle (100 repetitions between room temperature and 1000°C ) makes the bond between the sintered body 1 and the wire 2 continuously broken and leads to the increase of cracks
Therefore, the resistance value increases and causes insufficient reliability
Method used
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Embodiment 1
[0103] The thermistor elements actually manufactured using the method of manufacturing the thermistor element according to the first embodiment showed the following evaluation results.
[0104] First, a heat resistance test was performed on the thermistor element at 1000°C for 100 hours after firing. The results of the heat resistance test were similar to the powder extrusions, and it was confirmed that the resistance change rate was within 1% in the examples of the present invention.
[0105] In addition, a thermal cycle test (HCT) was performed on the fired thermistor element to investigate whether or not the resistance value increased by 2% due to the occurrence of cracks.
[0106] The conditions used in the thermal cycling test (HCT) were 100 cycles at room temperature and 1000°C alternating. A Pt wire (wire 2 ) (approximately 1 mm long) having a diameter of 0.20-0.31 mm was inserted into a rod-shaped dry molded body having a diameter of 1.85 mm×thickness 1.0 mm and a thr...
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Abstract
Disclosed is a manufacturing method for a thermistor element having a metal oxide sintered body for thermistor use and multiple lead wires connected to said metal oxide sintered body for thermistor use. The method has a step wherein a thermistor raw material powder formed from a metal oxide, an organic binder powder, and a solvent are mixed and kneaded to form a clay, a step wherein the clay is extrusion-molded by means of a molding die (13) to form a rod-shaped, green molded body having multiple through-holes, a step wherein the rod-shaped green molded body is dried to form a rod-shaped dried molded body, a step wherein the rod-shaped dried formed body is cut to a prescribed length to form a cut molded body having through-holes, and a step wherein lead wires are introduced into the through-holes of the cut molded body and firing is then performed to form a metal oxide sintered body for thermistor use from the cut molded body.
Description
technical field [0001] The present invention relates to a method of manufacturing a thermistor element used in temperature measurement related to automobiles and the like, and relates to a thermistor element. Background technique [0002] Generally, a thermistor element capable of measuring a very high temperature of about 1000° C. is required in a sensor for measuring a catalyst temperature around an automobile engine, an exhaust system temperature, and the like. Thermistor elements generally include metal oxide sintered bodies (for example, perovskite Y(Cr,Mn)O 3 ) and Pt wire. Resistance to thermal cycling from room temperature to 1000°C was obtained by inserting two Pt wires into a metal oxide sintered body and firmly fixing the Pt wires by sintering using metal oxide. [0003] Then, the Pt wire must be inserted before the sintering of the metal oxide, and the metal oxide and the Pt wire must be fired simultaneously. Since heat resistance to 1000°C is required, the me...
Claims
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IPC IPC(8): H01C7/04
CPCC04B2235/3267H01C7/04H01C7/008C04B2237/84C04B2235/3208C04B2235/9623C04B2235/3227C04B37/021C04B2237/345C04B2237/408C04B35/42C04B35/62685C04B2237/62C04B2235/3225C04B2235/6021Y10T29/49004Y10T29/49085
Inventor 藤田利晃藤原和崇山口尚志
Owner MITSUBISHI MATERIALS CORP