CN101752106A - Method of preventing failure of ceramic capacitor - Google Patents
Method of preventing failure of ceramic capacitor Download PDFInfo
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- CN101752106A CN101752106A CN200910312136A CN200910312136A CN101752106A CN 101752106 A CN101752106 A CN 101752106A CN 200910312136 A CN200910312136 A CN 200910312136A CN 200910312136 A CN200910312136 A CN 200910312136A CN 101752106 A CN101752106 A CN 101752106A
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Abstract
The invention relates to a method of preventing the failure of a ceramic capacitor, which belongs to the field of the ceramic capacitor of electronic equipment. The method comprises capacitor selection, electric fitting treatment, three-prevention treatment and environmental testing. The capacitor selection process comprises: (1) visual inspection; (2) temperature cycle: keeping a qualified capacitor in a high/low-temperature cabinet respectively at the temperature of minus 55 DEG C and 85 DEG for 30 minutes and cycling five times alternately; (3) high-temperature aging: keeping the capacitor after the temperature cycle in the second step in the high/low-temperature cabinet at the temperature of 85 DEG C for 48 hours, and judging whether the capacitor has a crack through real-time detection of the leakage current value of the capacitor; (4) final room-temperature testing: detecting the leakage current value, the withstand voltage value and the volume value of the capacitor at the room temperature; and (5) redetection of the appearance. The invention solves the problem of failure of the ceramic capacitor in the prior art, and is mainly applied in the protection of the ceramic capacitor of the electronic equipment.
Description
Technical field
The present invention relates to the means of defence that a kind of ceramic condenser lost efficacy, be specifically related to the means of defence that ceramic condenser lost efficacy in the electronic equipment.
Background technology
At present in the ceramic condenser application flow, needs according to product design, to the electronic equipment that assembles, carry out after temperature cycles, stress screening, the attribute testing, constantly have the ceramic condenser failure phenomenon to take place, light causing damages self, the serious printed board that causes damages, make the associated electrical damage of product, scrap, influence reliability, fail safe, manufacturing schedule and the delivery progress of electronic product, the problem that solves the ceramic condenser inefficacy is very necessary.
Ceramic condenser has goods and materials purchasing department, device screening department, Denso machining sector from purchasing to the main procedure links of testing process, transfers survey department, three to prevent processing departments, testing department, and goods and materials purchasing department buying ceramic condenser enters institute; By device screening department, require to screen according to screening specification, the screening project comprises that outward appearance preliminary investigation, temperature cycles, high temperature ageing, normal temperature are surveyed eventually, the outward appearance check; Denso department finishes dress welder work according to drawing technology afterwards; Transfer survey department to finish the debugging pretest work of product according to the debugging outline; Three anti-processing departments carry out three anti-, some envelope processing according to technology; Finally carry out verification experimental verification work in environmental test department.
This flow process is verified repeatedly, is found to exist in this flow process following defective to cause condenser failure:
A. device screening department fails effectively will exist the product of production defective to reject in screening process;
B. the whole production processing link is various, and transmittance process control does not have corresponding code requirement, has very big randomness, easily produces components from being damaged;
C. the Denso welding procedure is a common processes, at the related request of such device problem, does not easily produce components from being damaged;
D. also there is " dead angle " phenomenon in three products after anti-, can't reject " dead angle " phenomenon in existing technological process, have hidden danger.
E. very big in sudden change of electric capacity both end voltage or rate of change (Δ u/ Δ t), power up startup as computer, and electric capacity exposes in moisture to the open air, just make crackle or micro-crack continue to enlarge easily.
Summary of the invention
The invention provides the means of defence that a kind of ceramic condenser lost efficacy, solved the problem of the ceramic condenser inefficacy that exists in the prior art.
Technical solution of the present invention is as follows:
The means of defence that ceramic condenser of the present invention lost efficacy, its conventional steps comprise electric capacity screening, Denso processing, three anti-processing, environmental test, it is characterized in that described electric capacity screening process comprises:
(1) outward appearance preliminary investigation: observation is also rejected crackle electric capacity, chooses qualified electric capacity;
(2) temperature cycles: described qualified electric capacity is placed on earlier in the high-low temperature chamber of-55 ℃ and 85 ℃, keeps 30min respectively, alternate cycles five times;
(3) high temperature ageing: the electric capacity that temperature cycles in above-mentioned (2) step is crossed places 85 ℃ the interior 48h of maintenance of high-low temperature chamber, by the leakage current value of real-time detection electric capacity, judges electric capacity and whether has crackle;
(4) normal temperature is surveyed eventually: normal temperature detects leakage current value, withstand voltage, the appearance value of electric capacity down, and it is qualified to require to judge whether according to actual process;
(5) screening effect is further guaranteed in outward appearance check.
Above-mentioned Denso processing comprises wards off tin, plug-in mounting, welding for the first time, the time of warding off tin the described first time if enamel does not satisfy technological requirement, can also carry out warding off the second time tin for smaller or equal to 2 seconds, with warding off the tin time interval the described first time is 4～8 seconds, to reach technological requirement.
After warding off tin for the first time, before the plug-in mounting, adopt insulation tester electric capacity to be carried out the withstand voltage Insulation test of 100V.
Above-mentioned plug-in mounting leaves the gap between the ceramic body of assurance electric capacity and the printed board, preferably more than or equal to 1mm.
The crest welder welding is adopted in above-mentioned welding, and the welding temperature pace of change is smaller or equal to 2 ℃/Sec., and welding temperature is controlled curve as shown in Figure 3, and 2 ℃/Sec. is expressed as the temperature per second and changes 2 ℃.
Above-mentioned three anti-technologies comprise the electric capacity part irritated and are coated with: with the injecting glue needle tubing three anti-lacquer liquid are injected from electric capacity one side, opposite side overflows, and makes the electric capacity bottom and the gap of printed board be full of lacquer liquid, sprays afterwards.
Above-mentioned three anti-technologies also comprise pre-treating technology:
(1) use finishing agent cleaning ceramic condenser surface, described finishing agent is made up of the washed with de-ionized water agent of alcohol, adding 2% (percent by volume) non-ionic surface cleaning agent;
(2) clean again with above-mentioned washed with de-ionized water agent;
(3) adopt above-mentioned alcohol further to dewater;
(4) dry up the surface with compressed air;
(5) be positioned over oven drying.
Above-mentioned ceramic condenser is to adopt the specialized package box to deposit, transport, in case stop dropping, capacitance ceramic body that physical impacts such as collision causes crackle or micro-crack phenomenon occur, thereby makes capacitance damage.
Technique effect of the present invention is:
A. by the qualification of special process parameters such as temperature cycles in the screening process and high temperature ageing, effectively will exist the product of production defective to reject;
B. transmittance process control standardization adopts the specialized package box to deposit, and has avoided randomness, has reduced components from being damaged inefficacy probability;
C. the Denso welding procedure is a special process, detects in real time, rejects faulty goods, prevents the generation of losing efficacy;
D. three anti-process optimizations have solved " dead angle " phenomenon that exists in the existing technological process, have got rid of hidden danger.
Description of drawings
Below in conjunction with accompanying drawing the means of defence that ceramic condenser of the present invention lost efficacy is described further,
Fig. 1 is a ceramic condenser process for protecting flow chart;
Fig. 2 leaves the design sketch of specialized package box in for electric capacity;
Fig. 3 is welding temperature control curve chart.
Embodiment
In conjunction with process chart shown in Figure 1, the means of defence that ceramic condenser of the present invention lost efficacy comprises electric capacity screening, Denso processing, three anti-processing, environmental test technology successively, and wherein the electric capacity screening may further comprise the steps:
(1) outward appearance preliminary investigation: naked-eye observation is also rejected the crackle ceramic condenser, tentatively chooses qualified electric capacity;
(2) temperature cycles: the described qualified electric capacity of choosing placed earlier in-55 ℃ the high-low temperature chamber and carry out taking out after temperature is dashed test 30min, when treating that it recovers normal temperature state, place and carry out temperature in 85 ℃ the high-low temperature chamber and dash test 30min, alternate cycles is operated five times;
(3) high temperature ageing: the electric capacity that temperature cycles in above-mentioned (2) step is crossed places 85 ℃ the interior 48h of maintenance of high-low temperature chamber, leakage current value by real-time detection electric capacity, judge electric capacity and whether have crackle, if the leakage current value of detected electric capacity is less than 1 μ A, then electric capacity belongs to normally, flawless or crack; If the leakage current value of detected electric capacity is more than or equal to 1 μ A, then electric capacity belongs to unusually, has crackle or crack;
(4) normal temperature is surveyed eventually: electric capacity qualified behind the above-mentioned high temperature ageing is detected its leakage current value, withstand voltage and appearance value at normal temperatures respectively, if the leakage current value of the electric capacity that detects less than 1 μ A, withstand voltage reaches 100V, when the appearance value is 10 μ A, then belongs to qualified product;
(5) outward appearance check, rejecting exist crackle or crack, further guarantee screening effect.
Because the termination electrode of ceramic condenser, metal electrode, medium three's thermal coefficient of expansion difference is so lifting/lowering temperature speed is the principal element that we consider in the welding process.Therefore that need carry out electric capacity successively in the Denso course of processing wards off tin, plug-in mounting, welding procedure, the time of warding off tin was controlled within 2 seconds, to prevent that overlong time from influencing the performance of electric capacity, if the electric capacity of warding off behind the tin does not reach the actual process requirement, can carry out warding off tin the second time, but secondary is warded off tin and was controlled at least 48 seconds with the time interval of warding off for the first time tin; Owing to when crackle that ceramic condenser occurs or micro-crack, can cause insulation resistance (IR) to descend, after electric capacity is warded off tin, before the plug-in mounting, adopt insulation tester that electric capacity is carried out the withstand voltage Insulation test of 100V earlier, can use after qualified, thereby guarantee product quality; Carry out plug-in mounting technology afterwards again, between the ceramic body of electric capacity and printed board, leave the gap, and be preferably, thereby guarantee welding quality, reduce temperature shock more than or equal to 1mm; At last, adopt the crest welder welding that it is carried out welding procedure, guarantee the welding temperature pace of change smaller or equal to 2 ℃/Sec., welding temperature control curve as shown in Figure 3, before the welding with the rate temperature change of 2 ℃/Sec., preheating 60 seconds at least, make it reach 150 ℃, constant temperature kept 90 seconds, welded 45 seconds with the speed of 2 ℃/Sec. afterwards, this moment, temperature reached 240 ℃, kept 5 seconds, and carried out the nature cooling with the speed of 2 ℃/Sec. again and handle, do kind of a realization requirement of welding.
Because the ceramic condenser surface surface resistivity of ceramic condenser that all can cause such as contaminated, moist descends, thereby causes surface current to strengthen, and discharge probability raising high pressure under occurs.In the three anti-technologies, at first carry out pre-treating technology: use finishing agent cleaning ceramic condenser surface, described finishing agent is made up of the washed with de-ionized water agent of alcohol, adding 2% (percent by volume) non-ionic surface cleaning agent, clean again with above-mentioned washed with de-ionized water agent, remove the surface dirt with dehydration of alcohol again, dry up the surface with compressed air again, place oven drying integral body again; Afterwards the electric capacity part is irritated and be coated with: with the injecting glue needle tubing three anti-lacquer liquid are injected from electric capacity one side, opposite side overflows, and makes the electric capacity bottom and the gap of printed board be full of lacquer liquid, carries out the routine spraying afterwards.After handling like this, improved the surface cleanness of ceramic condenser product greatly, high pressure surface discharge problem has been greatly improved.Three anti-processing by electric capacity is carried out are stopped the possibility that extraneous moisture touches capacitive surface, thereby are improved the environment for use of electric capacity simultaneously, reduce the probability that fault produces.
In addition, for fear of the physical impacts that causes because of fall, collision etc., cause the capacitance ceramic body crackle or micro-crack to occur, cause capacitance damage, before the welding of multi-layer ceramic capacitance, must leave in the specialized package box, the design sketch that electric capacity leaves the specialized package box in is seen shown in Figure 2.
Claims (7)
1. the means of defence that lost efficacy of ceramic condenser, its conventional steps comprise that electric capacity screening, Denso processing, three are anti-ly handled, environmental test, it is characterized in that described electric capacity screening process comprises:
(1.1) outward appearance preliminary investigation: observation is also rejected crackle electric capacity, chooses qualified electric capacity;
(1.2) temperature cycles: described qualified electric capacity is placed on earlier in the high-low temperature chamber of 55 ℃ and 85 ℃, keeps 30min respectively, alternate cycles five times;
(1.3) high temperature ageing: the electric capacity that temperature cycles in above-mentioned (1.2) step is crossed places 85 ℃ the interior 48h of maintenance of high-low temperature chamber, by the leakage current value of real-time detection electric capacity, judges electric capacity and whether has crackle;
(1.4) normal temperature is surveyed eventually: normal temperature detects leakage current value, withstand voltage, the appearance value of electric capacity down;
(1.5) outward appearance check.
2. the means of defence that ceramic condenser according to claim 1 lost efficacy is characterized in that, described Denso processing comprises wards off tin, plug-in mounting, welding for the first time, and the time of warding off tin the described first time is smaller or equal to 2 seconds;
After warding off tin the described first time, before the plug-in mounting, adopt insulation tester electric capacity to be carried out the withstand voltage Insulation test of 100V;
Described plug-in mounting leaves the gap between the ceramic body of electric capacity and printed board;
The crest welder welding is adopted in described welding, and the welding temperature pace of change is smaller or equal to 2 ℃/Sec..
3. the means of defence that ceramic condenser according to claim 1 and 2 lost efficacy is characterized in that, the described tin of warding off also comprises and wards off tin for the second time, is 4～8 seconds with warding off the tin time interval the described first time.
4. the means of defence that ceramic condenser according to claim 2 lost efficacy is characterized in that the ceramic body of described electric capacity and the gap between the printed board are more than or equal to 1mm.
5. the means of defence that ceramic condenser according to claim 1 lost efficacy, it is characterized in that, described three anti-technologies comprise the electric capacity part irritated and are coated with: with the injecting glue needle tubing three anti-lacquer liquid are injected from electric capacity one side, opposite side overflows, make the electric capacity bottom and the gap of printed board be full of lacquer liquid, spray afterwards.
6. the means of defence that ceramic condenser according to claim 5 lost efficacy is characterized in that, described three anti-technologies also comprise pre-treating technology:
(6.1) use finishing agent cleaning ceramic condenser surface, described finishing agent is made up of the washed with de-ionized water agent of alcohol, adding 2% (percent by volume) non-ionic surface cleaning agent;
(6.2) clean with above-mentioned washed with de-ionized water agent;
(6.3) use above-mentioned dehydration of alcohol;
(6.4) dry up with compressed air;
(6.5) oven drying.
7. the means of defence that ceramic condenser according to claim 6 lost efficacy is characterized in that, described electric capacity is to adopt the specialized package box to deposit, transport.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103121365A CN101752106B (en) | 2009-12-23 | 2009-12-23 | Method of preventing failure of ceramic capacitor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103121365A CN101752106B (en) | 2009-12-23 | 2009-12-23 | Method of preventing failure of ceramic capacitor |
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| CN101752106A true CN101752106A (en) | 2010-06-23 |
| CN101752106B CN101752106B (en) | 2011-07-06 |
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| CN2009103121365A Expired - Fee Related CN101752106B (en) | 2009-12-23 | 2009-12-23 | Method of preventing failure of ceramic capacitor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928797A (en) * | 2012-10-23 | 2013-02-13 | 上海市电力公司 | Damp and heat resistance testing method for power online monitoring device |
| CN110161341A (en) * | 2019-06-05 | 2019-08-23 | 广东博立科技有限公司 | The component accelerated ageing method of inspection of electronic product |
| CN111679149A (en) * | 2020-06-22 | 2020-09-18 | 肇庆绿宝石电子科技股份有限公司 | Screening method of solid capacitor |
| CN111822392A (en) * | 2020-07-16 | 2020-10-27 | 湖南艾华集团股份有限公司 | Method for screening fracture of negative foil of aluminum electrolytic capacitor |
| CN113644012A (en) * | 2021-08-10 | 2021-11-12 | 上海音特电子有限公司 | Screening device and screening method for semiconductor discharge tube |
-
2009
- 2009-12-23 CN CN2009103121365A patent/CN101752106B/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928797A (en) * | 2012-10-23 | 2013-02-13 | 上海市电力公司 | Damp and heat resistance testing method for power online monitoring device |
| CN110161341A (en) * | 2019-06-05 | 2019-08-23 | 广东博立科技有限公司 | The component accelerated ageing method of inspection of electronic product |
| CN110161341B (en) * | 2019-06-05 | 2021-05-25 | 广东博立科技有限公司 | Accelerated aging inspection method for components of electronic product |
| CN111679149A (en) * | 2020-06-22 | 2020-09-18 | 肇庆绿宝石电子科技股份有限公司 | Screening method of solid capacitor |
| CN111822392A (en) * | 2020-07-16 | 2020-10-27 | 湖南艾华集团股份有限公司 | Method for screening fracture of negative foil of aluminum electrolytic capacitor |
| CN111822392B (en) * | 2020-07-16 | 2022-03-01 | 湖南艾华集团股份有限公司 | Method for screening fracture of negative foil of aluminum electrolytic capacitor |
| CN113644012A (en) * | 2021-08-10 | 2021-11-12 | 上海音特电子有限公司 | Screening device and screening method for semiconductor discharge tube |
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| Publication number | Publication date |
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| CN101752106B (en) | 2011-07-06 |
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