Resistance Adjustment Method of Positive Temperature Coefficient Ceramic Thermistor
A positive temperature coefficient and thermistor technology, applied in the direction of resistors with positive temperature coefficient, etc., can solve the problems of low use value, large resistance value dispersion, and low pass rate, and achieve high use value and pass rate High, low-cost effect
Active Publication Date: 2016-04-27
深圳市伟林高科技股份有限公司 +1
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[0003] The invention patent "Method for Adjusting Resistance of Barium Titanate-Based Positive Temperature Coefficient Thermistor" (Patent Application No. 201210202405.4) discloses a method of lowering the high resistance chip. Before processing, the original electrode of the chip must be removed, and then press The method of this invention is heat-treated, but the resistance value of the thermistor has large dispersion after treatment, and the pass rate after treatment is not high. After the treatment, it needs to be re-electroded. Other production costs during heat treatment, the cost saved is even less, so the actual use value is not high
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[0016] Embodiment of the present invention: the resistance adjustment method of the positive temperature coefficient ceramic thermistor is tested with a PTC chip of Ф7, and the required qualified resistance value range is 60-80Ω, and the qualified rate is 50-60% during actual production, so there are a large number of The idle product above 80Ω, now 80~90Ω is processed into 60~80Ω by the method of the present invention, and the steps are as follows:
[0017] 1) Sorting: Collect 20,000 80-100Ω PTC chips together, keep the temperature at 25±2°C for 2 hours, randomly check the resistance value of 20 PTC chips, see Table 1;
[0018]
[0019] According to Table 1, the maximum resistance value of the 20 PTC chips sampled is 89.4Ω, the minimum is 80.7Ω, and the average is 84.5Ω
[0020] 2) Soaking: Soak the 20,000 PTC chips sorted in step 1) in turpentine for 10 minutes;
[0021] 3) Drying: Use a plastic sieve to filter out the soaked PTC chip and dry it naturally, as long as the...
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The invention discloses a resistance adjusting method for a ceramic thermistor with a positive temperature coefficient. According to the invention, a PTC chip with a resistance value exceeding a standard is soaked in a solvent and then undergoes heat treatment, a substance in the solvent is allowed to seal fine holes in a ceramic body in the high temperature heat treatment process, which results in oxygen deficiency of the ceramic body in the process of cooling, so the resistance value is decreased. In the whole process of treatment, the original electrode of the PTC chip does not needed to be removed at first, then recoating of an electrode is not needed after treatment, a high qualified rate is obtained after treatment, a treating manner is simple, no additional equipment is needed, low cost is realized, and a high practical use value is obtained.
Description
technical field [0001] The invention relates to the technical field of electronic products, in particular to a method for adjusting resistance of a positive temperature coefficient ceramic thermistor. Background technique [0002] The positive temperature coefficient thermistor (Positivetemperaturecoefficientresistance, referred to as PTCR) is a resistance component whose resistance value increases step by step in a certain temperature range as the temperature rises. It is composed of barium titanate doped donors, acceptors, After the temperature moving agent is mixed and ground, it is sintered at 1300-1400°C. The resistance value is normally distributed. Because the resistance value is very sensitive to temperature and time, the sintering pass rate is not high, and there will be a large number of idle chips. . [0003] Invention patent "Method for Adjusting Resistance of Barium Titanate-Based Positive Temperature Coefficient Thermistor" (Patent Application No. 201210202405...
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IPC IPC(8): H01C7/02
Inventor 朱同江石开轩鲍峰石国源张波石向东
Owner 深圳市伟林高科技股份有限公司