CN102842397A - Positive temperature coefficient thermistor resistance trimming method of barium titanate system - Google Patents
Positive temperature coefficient thermistor resistance trimming method of barium titanate system Download PDFInfo
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Abstract
The invention belongs to the technical field of physics, and further relates to a positive temperature coefficient thermistor resistance trimming method of a barium titanate system in the technical field of electronic parts and components. The positive temperature coefficient thermistor resistance trimming method of the barium titanate system comprises the following steps of: sorting resistor elements; weighting raw materials of resistance reducing reagents; preparing the resistance reducing reagents; carrying out thermal treatment on the element to be processed and the resistance reducing reagents; and measuring the resistance value of the element. According to the positive temperature coefficient thermistor resistance trimming method of the barium titanate system provided by the invention, the elements with resistance values higher than a rated value are selected as the elements to be processed after the positive temperature coefficient thermistor elements of the barium titanate system are sorted according to resistance values; the two resistance reducing reagents are prepared according to that whether the resistance values of the elements are more than 7 kilo-ohms; and the resistance values of the elements are adjusted by commonly carrying out the thermal treatment on the resistance reducing reagents and the elements to be processed, so that the resistance values of the elements can reach the rated value. With the adoption of the positive temperature coefficient thermistor resistance trimming method of the barium titanate system provided by the invention, the resistance value of the sintered positive temperature coefficient thermistor element of the barium titanate system can be adjusted for the first time, so that a large batch of unqualified elements can be repeatedly used, a great amount of raw materials and energy can be saved for enterprise production, and considerable economical benefits can be created.
Description
Technical field
The invention belongs to the physical technique field, further relate to a kind of barium titanate series semistor resistance trimming method of technical field of electronic components.The present invention is after the barium titanate series thermosensitive resistor with positive temp coefficient is to the resistance value sorting; The element that resistance value is higher than rated value of resistance is elected pending element as; Fall resistance reagent and the common heat treatment regulating element of pending element resistance value through what will develop voluntarily, make it reach rated value of resistance.
Background technology
Semistor (positive temperature coefficient resistance; Be called for short PTCR); The resistor that also to be resistance value rise and can in some narrower temperature ranges, significantly raise with temperature has been widely used in every field such as telecommunications, auto industry, medical apparatus, household electrical appliance.Wherein, barium titanate (BaTiO3) is that semistor is in barium titanate, to add the semiconductor element that elements such as yttrium, niobium form, and in existing market, occupies very big ratio.
Existing barium titanate series semistor generally is to adopt following technological process to make: raw material ball milling-oven dry-pre-burning-secondary adds pellet mill-oven dry-moulding-sintering-electrode coated-sorting-welding lead-seal-test; Because the influence of factors such as technological parameter control; Element according to the resistance value sorting after; Resistance value has sizable dispersiveness, can produce the element that a large amount of resistance values are higher than rated value of resistance.Owing to do not have suitable processing mode in the past, these elements can only be dropped as substandard product, all are wasted and make raw material, water and the energy that these elements expend thereupon.
The patent of Nantong Hongfei Electron Co., Ltd.'s application " improves the method for PTC thermistor electrical performance indexes ", and (application number 200910184082.9, publication number CN 101673603 A) disclose the manufacturing approach that improves barium titanate series thermistor electrical property.This invention provides a kind of method that improves barium titanate-based PTC thermistor electrical performance indexes, comprises that raw materials weighing, ball milling, presintering, granulation, moulding, sintering, top electrode, resistance sorting, welding, encapsulation assembling, mark will, resistance test, resistance detect, finally detect, pack these steps; The characteristics of this method are after the presintering step, and ball milling adds percentage by weight and accounts for 0.03～0.05% precious metal material after 0.5～1.5 hour again, continue ball milling 4～8 hours, have improved the electric property of element.The deficiency that this patent application exists is; This technological process can not be adjusted the component resistance value after the resistance value sorting; In the production resistance value be higher than the element of rated value of resistance can only be as substandard product, these waste products have caused the waste to the raw materials for production and the energy.
Summary of the invention
The objective of the invention is to overcome the deficiency of above-mentioned prior art, a kind of barium titanate series semistor resistance trimming method is provided.Through in manufacturing process, adding this new technology link, the resistance branch chooses resistance value to realize first reducing significantly greater than the component resistance of rated value of resistance, can obtain more qualified products in the production process.The element electrode type that the present invention is suitable for comprises on aluminium electrode and the aluminium electrode two kinds at coated silver electrode again.
Concrete thinking of the present invention is greater than 7K Ω with less than two kinds of situation of 7K Ω, to have designed two kinds of corresponding resistance trimming methods to pending component resistance value.These two step differences of prescription of resistance reagent fall in pending component resistance value of wherein choosing during the sorting resistive element and preparation.And the technology in falling resistance reagent preparation, heat treatment and three steps of measuring component resistance value is identical.Its concrete realization is divided into following two kinds of technical schemes:
One. following greater than the step that the pending element of 7K Ω carries out resistance trimming to resistance value:
(1) sorting resistive element
The sorting instrument is treated the element of sorting and is classified according to the size of resistance value, from resistance value greater than take out the classification of 7K Ω resistance value greater than the element of resistance value rated value as pending element;
(2) raw material of resistance reagent falls in weighing
With electronic balance according to the molar ratio preparation resistance reagent falls respectively; Wherein, calcium carbonate 0.500～0.700, manganese carbonate 0.010～0.020, sodium carbonate 0.070～0.090, carbonic hydroammonium 0.210～0.220, anhydrous calcium acetate 0.001～0.003, brium carbonate 0.001～0.003, strontium carbonate 0.001～0.003, strontium titanyl oxalate 0.001～0.003, graphite powder 0.001～0.003, carbon dust 0.002～0.004;
(3) the resistance reagent preparation is fallen
Raw materials weighing through ball milling, stoving process, is obtained falling resistance reagent;
(4) heat treatment
(4a) according to pending element with resistance reagent 3: 1 mass ratio falls, treat treatment element and fall resistance reagent and carry out weighing respectively with electronic balance;
(4b) with the pending element after the weighing with fall the resistance reagent put into crucible with cover;
(4c) crucible is put into Muffle furnace heat treatment;
(5) measuring component resistance value
(5a) element after the heat treatment is taken out, use washed with de-ionized water, oven dry;
(5b) element in the baking oven is taken out, with the resistance value of universal instrument measuring component.
Two. following less than the step that the pending element of 7K Ω carries out resistance trimming to resistance value:
1) sorting resistive element
The sorting instrument is treated the element of sorting and is classified according to the size of resistance value, from resistance value less than take out the classification of 7K Ω resistance value greater than the element of resistance value rated value as pending element;
2) raw material of resistance reagent falls in weighing
With electronic balance according to the molar ratio preparation resistance reagent falls respectively; Wherein, calcium carbonate 0.500～0.700, manganese carbonate 0.010～0.020, sodium carbonate 0.070～0.090, carbonic hydroammonium 0.210～0.220, anhydrous calcium acetate 0.001～0.003, brium carbonate 0.001～0.003, strontium carbonate 0.001～0.003, strontium titanyl oxalate 0.001～0.003, graphite powder 0.001～0.003, carbon dust 0.002～0.004, iron powder 0.002～0.004, zinc powder 0.001～0.003, aluminium powder 0.001～0.003;
3) the resistance reagent preparation is fallen
Raw materials weighing through ball milling, stoving process, is obtained falling resistance reagent;
4) heat treatment
4a) according to pending element with resistance reagent 3: 1 mass ratio falls, treat treatment element and fall resistance reagent and carry out weighing respectively with electronic balance;
4b) with the pending element after the weighing with fall the resistance reagent put into crucible with cover;
4c) crucible is put into Muffle furnace heat treatment;
5) measuring component resistance value
5a) element after the heat treatment is taken out, use washed with de-ionized water, oven dry;
5b) element in the baking oven is taken out, with the resistance value of universal instrument measuring component.
The present invention compared with prior art has the following advantages:
First; The present invention is because the resistance reagent that falls that has adopted utilization to develop is voluntarily treated the technology that treatment element is heat-treated; Overcome prior art and can not adjust the shortcoming that resistance value after the sorting is higher than the resistance of rated value of resistance element, made the present invention have the advantage that can pending component resistance value be reduced.
Second; The present invention is owing to having adopted pending element and having fallen resistance reagent and put into the technology that crucible with cover is heat-treated simultaneously; Overcome prior art the defective element that resistance value is higher than rated value of resistance has been abandoned, strengthened the shortcoming of cost, made the present invention have a large amount of substandard products are utilized again; Improve product percent of pass, practiced thrift the advantage of the raw material and the energy;
The 3rd; The present invention is owing to adopted the technology of in crucible with cover, heat-treating; It is too open to have overcome the prior art heating environment, falls resistance reagent and the shortcoming that element can not fully contact, and makes the present invention have and has improved the advantage of falling resistance reagent and pending element heat treatment efficiency.
Description of drawings
Fig. 1 flow chart of the present invention.
Embodiment
1 couple of the present invention does further detailed description below in conjunction with accompanying drawing:
One. to the pending element of resistance value, provide following three kinds of embodiment greater than 7K Ω:
Embodiment 1
Step 1, the sorting resistive element
The sorting instrument is treated the element of sorting and is classified according to the size of resistance value, take out resistance value at the element of 20K Ω～30K Ω as pending element, the resistance value after requiring to handle is 8K Ω～15K Ω.Component shape is the cylinder of diameter 3mm, height 4mm.
The raw material of resistance reagent falls in step 2, weighing
With electronic balance according to the molar ratio preparation resistance reagent falls respectively; Wherein, calcium carbonate 0.700, manganese carbonate 0.020, sodium carbonate 0.090, carbonic hydroammonium 0.220, anhydrous calcium acetate 0.003, brium carbonate 0.003, strontium carbonate 0.003, strontium titanyl oxalate 0.003, graphite powder 0.003, carbon dust 0.004.
The resistance reagent preparation falls in step 3
With raw materials weighing and deionized water, agate abrading-ball according to material: water: the mass ratio of ball=1: 1: 1 is put into ball grinder, and ball milling is 8 hours on ball mill; Behind the stop of ball grinder, raw materials weighing is taken out from ball grinder, put into 150 ℃ of baking ovens, toasted 8 hours.
Step 4, heat treatment
With the pending element of electronic balance weighing 15.3 grams, according to pending element with 3: 1 mass ratio of resistance reagent falls, restrain with electronic balance weighing 5.1 and fall resistance reagent; With the pending element after the weighing with fall the resistance reagent put into crucible with cover; Crucible is put into Muffle furnace heat treatment, temperature in the stove is begun to be controlled at from room temperature in 70 minutes the warm-up time, make it reach 700 ℃, stop to heat, be incubated 180 minutes again.
Step 5, the measuring component resistance value
Element after the heat treatment is taken out, use washed with de-ionized water, the element after cleaning is put into 80 ℃ of baking ovens, toasted 4 hours; Element in the baking oven is taken out, use the resistance value of universal instrument measuring component to be 8K Ω～15K Ω.
Embodiment 2
Step 1, the sorting resistive element
The sorting instrument is treated the element of sorting and is classified according to the size of resistance value, take out resistance value at the element of 10K Ω～20K Ω as pending element, the resistance value after requiring to handle is 4K Ω～8K Ω.Component shape is the cylinder of diameter 3mm, height 4mm.
The raw material of resistance reagent falls in step 2, weighing
With electronic balance according to the molar ratio preparation resistance reagent falls respectively; Wherein, calcium carbonate 0.685, manganese carbonate 0.015, sodium carbonate 0.085, carbonic hydroammonium 0.215, anhydrous calcium acetate 0.002, brium carbonate 0.002, strontium carbonate 0.001, strontium titanyl oxalate 0.001, graphite powder 0.001, carbon dust 0.003.
The resistance reagent preparation falls in step 3
With raw materials weighing and deionized water, agate abrading-ball according to material: water: the mass ratio of ball=1: 1: 1 is put into ball grinder, and ball milling is 6 hours on ball mill; Behind the stop of ball grinder, raw materials weighing is taken out from ball grinder, put into 150 ℃ of baking ovens, toasted 6 hours.
Step 4, heat treatment
With the pending element of electronic balance weighing 14.4 grams, according to pending element with 3: 1 mass ratio of resistance reagent falls, restrain with electronic balance weighing 4.8 and fall resistance reagent; With the pending element after the weighing with fall the resistance reagent put into crucible with cover; Crucible is put into Muffle furnace heat treatment, temperature in the stove is begun to be controlled at from room temperature in 60 minutes the warm-up time, make it reach 600 ℃, stop to heat, be incubated 120 minutes again.
Step 5, the measuring component resistance value
Element after the heat treatment is taken out, use washed with de-ionized water, the element after cleaning is put into 80 ℃ of baking ovens, toasted 3 hours; Element in the baking oven is taken out, use the resistance value of universal instrument measuring component to be 4K Ω～8K Ω.
Embodiment 3
Step 1, the sorting resistive element
The sorting instrument is treated the element of sorting and is classified according to the size of resistance value, take out resistance value at the element of 7K Ω～10K Ω as pending element, the resistance value after requiring to handle is 2K Ω～4K Ω.Component shape is the cylinder of diameter 3mm, height 4mm.
The raw material of resistance reagent falls in step 2, weighing
With electronic balance according to the molar ratio preparation resistance reagent falls respectively; Wherein, calcium carbonate 0.500, manganese carbonate 0.010, sodium carbonate 0.070, carbonic hydroammonium 0.210, anhydrous calcium acetate 0.001, brium carbonate 0.001, strontium carbonate 0.001, strontium titanyl oxalate 0.001, graphite powder 0.001, carbon dust 0.002.
The resistance reagent preparation falls in step 3
With raw materials weighing and deionized water, agate abrading-ball according to material: water: the mass ratio of ball=1: 1: 1 is put into ball grinder, and ball milling is 4 hours on ball mill; Behind the stop of ball grinder, raw materials weighing is taken out from ball grinder, put into 150 ℃ of baking ovens, toasted 4 hours.
Step 4, heat treatment
With the pending element of electronic balance weighing 15.6 grams, according to pending element with 3: 1 mass ratio of resistance reagent falls, restrain with electronic balance weighing 5.2 and fall resistance reagent; With the pending element after the weighing with fall the resistance reagent put into crucible with cover; Crucible is put into Muffle furnace heat treatment, temperature in the stove is begun to be controlled at from room temperature in 50 minutes the warm-up time, make it reach 500 ℃, stop to heat, be incubated 60 minutes again.
Step 5, the measuring component resistance value
Element after the heat treatment is taken out, use washed with de-ionized water, the element after cleaning is put into 80 ℃ of baking ovens, toasted 2 hours; Element in the baking oven is taken out, use the resistance value of universal instrument measuring component to be 2K Ω～4K Ω.
Two. to the pending element of resistance value, provide following three kinds of embodiment less than 7K Ω:
Embodiment 4
Step 1, the sorting resistive element
The sorting instrument is treated the element of sorting and is classified according to the size of resistance value, take out resistance value at the element of 2K Ω～7K Ω as pending element, the resistance value after requiring to handle is 1.2K Ω～2K Ω.Component shape is the cylinder of diameter 3mm, height 4mm.
The raw material of resistance reagent falls in step 2, weighing
With electronic balance according to the molar ratio preparation resistance reagent falls respectively; Wherein, calcium carbonate 0.700, manganese carbonate 0.020, sodium carbonate 0.090, carbonic hydroammonium 0.220, anhydrous calcium acetate 0.003, brium carbonate 0.003, strontium carbonate 0.003, strontium titanyl oxalate 0.003, graphite powder 0.003, carbon dust 0.004, iron powder 0.004, zinc powder 0.003, aluminium powder 0.003.
The resistance reagent preparation falls in step 3
With raw materials weighing and deionized water, agate abrading-ball according to material: water: the mass ratio of ball=1: 1: 1 is put into ball grinder, and ball milling is 8 hours on ball mill; After ball mill stops, raw materials weighing is taken out from ball grinder, put into 150 ℃ of baking ovens, toasted 8 hours.
Step 4, heat treatment
With the pending element of electronic balance weighing 14.7 grams, according to pending element with 3: 1 mass ratio of resistance reagent falls, restrain with electronic balance weighing 4.9 and fall resistance reagent; With the pending element after the weighing with fall the resistance reagent put into crucible with cover; Crucible is put into Muffle furnace heat treatment, temperature in the stove is begun to be controlled at from room temperature in 70 minutes the warm-up time, make it reach 700 ℃, stop to heat, be incubated 180 minutes again.
Step 5, the measuring component resistance value
Element after the heat treatment is taken out, use washed with de-ionized water, the element after cleaning is put into 80 ℃ of baking ovens, toasted 4 hours; Element in the baking oven is taken out, use the resistance value of universal instrument measuring component to be 1.2K Ω～2K Ω.
Embodiment 5
Step 1, the sorting resistive element
The sorting instrument is treated the element of sorting and is classified according to the size of resistance value, take out resistance value at the element of 800 Ω～2K Ω as pending element, the resistance value after requiring to handle is 300 Ω～1.2K Ω.Component shape is the cylinder of diameter 3mm, height 4mm.
The raw material of resistance reagent falls in step 2, weighing
With electronic balance according to the molar ratio preparation resistance reagent falls respectively; Wherein, calcium carbonate 0.685, manganese carbonate 0.015, sodium carbonate 0.085, carbonic hydroammonium 0.215, anhydrous calcium acetate 0.002, brium carbonate 0.002, strontium carbonate 0.002, strontium titanyl oxalate 0.002, graphite powder 0.002, carbon dust 0.003, iron powder 0.003, zinc powder 0.002, aluminium powder 0.002.
The resistance reagent preparation falls in step 3
With raw materials weighing and deionized water, agate abrading-ball according to material: water: the mass ratio of ball=1: 1: 1 is put into ball grinder, and ball milling is 6 hours on ball mill; After ball mill stops, raw materials weighing is taken out from ball grinder, put into 150 ℃ of baking ovens, toasted 6 hours.
Step 4, heat treatment
With the pending element of electronic balance weighing 15.0 grams, according to pending element with 3: 1 mass ratio of resistance reagent falls, restrain with electronic balance weighing 5.0 and fall resistance reagent; With the pending element after the weighing with fall the resistance reagent put into crucible with cover; Crucible is put into Muffle furnace heat treatment, temperature in the stove is begun to be controlled at from room temperature in 60 minutes the warm-up time, make it reach 600 ℃, stop to heat, be incubated 120 minutes again.
Step 5, the measuring component resistance value
Element after the heat treatment is taken out, use washed with de-ionized water, the element after cleaning is put into 80 ℃ of baking ovens, toasted 3 hours; Element in the baking oven is taken out, and using the resistance value of universal instrument measuring component is 300 Ω～1.2K Ω.
Embodiment 6
Step 1, the sorting resistive element
The sorting instrument is treated the element of sorting and is classified according to the size of resistance value, take out resistance value at the element of 300 Ω～500 Ω as pending element, the resistance value after requiring to handle is 200 Ω～400 Ω.Component shape is the cylinder of diameter 3mm, height 4mm.
The raw material of resistance reagent falls in step 2, weighing
With electronic balance according to the molar ratio preparation resistance reagent falls respectively; Wherein, calcium carbonate 0.500, manganese carbonate 0.010, sodium carbonate 0.070, carbonic hydroammonium 0.210, anhydrous calcium acetate 0.001, brium carbonate 0.001, strontium carbonate 0.001, strontium titanyl oxalate 0.001, graphite powder 0.001, carbon dust 0.002, iron powder 0.002, zinc powder 0.001, aluminium powder 0.001.
The resistance reagent preparation falls in step 3
With raw materials weighing and deionized water, agate abrading-ball according to material: water: the mass ratio of ball=1: 1: 1 is put into ball grinder, and ball milling is 4 hours on ball mill; After ball mill stops, raw materials weighing is taken out from ball grinder, put into 150 ℃ of baking ovens, toasted 4 hours.
Step 4, heat treatment
With the pending element of electronic balance weighing 15.3 grams, according to pending element with 3: 1 mass ratio of resistance reagent falls, restrain with electronic balance weighing 5.1 and fall resistance reagent; With the pending element after the weighing with fall the resistance reagent put into crucible with cover; Crucible is put into Muffle furnace heat treatment, temperature in the stove is begun to be controlled at from room temperature in 50 minutes the warm-up time, make it reach 500 ℃, stop to heat, be incubated 60 minutes again.
Step 5, the measuring component resistance value
Element after the heat treatment is taken out, use washed with de-ionized water, the element after cleaning is put into 80 ℃ of baking ovens, toasted 2 hours; Element in the baking oven is taken out, and using the resistance value of universal instrument measuring component is 200 Ω～400 Ω.
In sum, the present invention can realize the adjustment of barium titanate series semistor resistance effectively, has improved the efficient and the product percent of pass of enterprise production, has practiced thrift the raw material and the energy, can create considerable economic value.
Claims (10)
1. a resistance value comprises the steps: greater than the barium titanate series semistor resistance trimming method of 7K Ω
(1) sorting resistive element
The sorting instrument is treated the element of sorting and is classified according to the size of resistance value, from resistance value greater than take out the classification of 7K Ω resistance value greater than the element of resistance value rated value as pending element;
(2) raw material of resistance reagent falls in weighing
With electronic balance according to the molar ratio preparation resistance reagent falls respectively; Wherein, calcium carbonate 0.500～0.700, manganese carbonate 0.010～0.020, sodium carbonate 0.070～0.090, carbonic hydroammonium 0.210～0.220, anhydrous calcium acetate 0.001～0.003, brium carbonate 0.001～0.003, strontium carbonate 0.001～0.003, strontium titanyl oxalate 0.001～0.003, graphite powder 0.001～0.003, carbon dust 0.002～0.004;
(3) the resistance reagent preparation is fallen
Raw materials weighing through ball milling, stoving process, is obtained falling resistance reagent;
(4) heat treatment
(4a) according to pending element with resistance reagent 3: 1 mass ratio falls, treat treatment element and fall resistance reagent and carry out weighing respectively with electronic balance;
(4b) with the pending element after the weighing with fall the resistance reagent put into crucible with cover;
(4c) crucible is put into Muffle furnace heat treatment;
(5) measuring component resistance value
(5a) element after the heat treatment is taken out, use washed with de-ionized water, oven dry;
(5b) element in the baking oven is taken out, with the resistance value of universal instrument measuring component.
2. resistance value according to claim 1 is greater than the barium titanate series semistor resistance trimming method of 7K Ω; It is characterized in that: the ball-milling technology described in the step (3) is meant raw materials weighing and deionized water, agate abrading-ball according to material: water: the mass ratio of ball=1: 1: 1 is put into ball grinder, and ball milling is 4～8 hours on ball mill.
3. resistance value according to claim 1 is greater than the barium titanate series semistor resistance trimming method of 7K Ω; It is characterized in that: the stoving process described in the step (3) is meant raw materials weighing is taken out from ball grinder; Put into 150 ℃ of baking ovens, toasted 4～8 hours.
4. resistance value according to claim 1 is greater than the barium titanate series semistor resistance trimming method of 7K Ω; It is characterized in that: the heat treatment described in the step (4c) is meant; Temperature in the stove begun to be controlled at from room temperature in 50～70 minutes the warm-up time; Make its temperature range that reaches 500～700 ℃, stop to heat, be incubated 60～180 minutes again.
5. resistance value according to claim 1 is characterized in that greater than the barium titanate series semistor resistance trimming method of 7K Ω: the oven dry described in the step (5a) is meant puts into 80 ℃ of baking ovens with the element after cleaning, and toasts 2～4 hours.
6. a resistance value comprises the steps: less than the barium titanate series semistor resistance trimming method of 7K Ω
1) sorting resistive element
The sorting instrument is treated the element of sorting and is classified according to the size of resistance value, from resistance value less than take out the classification of 7K Ω resistance value greater than the element of resistance value rated value as pending element;
2) raw material of resistance reagent falls in weighing
With electronic balance according to the molar ratio preparation resistance reagent falls respectively; Wherein, calcium carbonate 0.500～0.700, manganese carbonate 0.010～0.020, sodium carbonate 0.070～0.090, carbonic hydroammonium 0.210～0.220, anhydrous calcium acetate 0.001～0.003, brium carbonate 0.001～0.003, strontium carbonate 0.001～0.003, strontium titanyl oxalate 0.001～0.003, graphite powder 0.001～0.003, carbon dust 0.002～0.004, iron powder 0.002～0.004, zinc powder 0.001～0.003, aluminium powder 0.001～0.003;
3) the resistance reagent preparation is fallen
Raw materials weighing through ball milling, stoving process, is obtained falling resistance reagent;
4) heat treatment
4a) according to pending element with resistance reagent 3: 1 mass ratio falls, treat treatment element and fall resistance reagent and carry out weighing respectively with electronic balance;
4b) with the pending element after the weighing with fall the resistance reagent put into crucible with cover;
4c) crucible is put into Muffle furnace heat treatment;
5) measuring component resistance value
5a) element after the heat treatment is taken out, use washed with de-ionized water, oven dry;
5b) element in the baking oven is taken out, with the resistance value of universal instrument measuring component.
7. barium titanate series semistor resistance trimming method according to claim 2; It is characterized in that: the ball-milling technology described in the step 3) is meant raw materials weighing and deionized water, agate abrading-ball according to material: water: the mass ratio of ball=1: 1: 1 is put into ball grinder, and ball milling is 4～8 hours on ball mill.
8. barium titanate series semistor resistance trimming method according to claim 2 is characterized in that: the stoving process described in the step 3) is meant raw materials weighing is taken out from ball grinder, puts into 150 ℃ of baking ovens, toasts 4～8 hours.
9. barium titanate series semistor resistance trimming method according to claim 2; It is characterized in that: the heat treatment step 4c) is meant; Temperature in the stove begun to be controlled at from room temperature in 50～70 minutes the warm-up time; Make its temperature range that reaches 500～700 ℃, stop to heat, be incubated 60～180 minutes again.
10. barium titanate series semistor resistance trimming method according to claim 2 is characterized in that: the oven dry step 5a) is meant puts into 80 ℃ of baking ovens with the element after cleaning, and toasts 2～4 hours.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103606426A (en) * | 2013-11-29 | 2014-02-26 | 深圳市伟林高科技股份有限公司 | Resistance adjusting method for ceramic thermistor with positive temperature coefficient |
| CN113155328A (en) * | 2021-01-24 | 2021-07-23 | 西安电子科技大学 | Flexible passive pressure sensor, preparation method and wearable touch sensor |
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| CN1050638A (en) * | 1989-09-26 | 1991-04-10 | 袁淑惠 | Grounded resistance reducing agent |
| JP2000264725A (en) * | 1999-03-19 | 2000-09-26 | Tdk Corp | Production of semiconductor porcelain |
| CN101620900A (en) * | 2009-08-13 | 2010-01-06 | 南通鸿飞电子有限公司 | Method for increasing PTC thermistance yield by reducing resistance value |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103606426A (en) * | 2013-11-29 | 2014-02-26 | 深圳市伟林高科技股份有限公司 | Resistance adjusting method for ceramic thermistor with positive temperature coefficient |
| CN103606426B (en) * | 2013-11-29 | 2016-04-27 | 深圳市伟林高科技股份有限公司 | The resistance trimming method of ceramic positive temperature coefficient thermistor |
| CN113155328A (en) * | 2021-01-24 | 2021-07-23 | 西安电子科技大学 | Flexible passive pressure sensor, preparation method and wearable touch sensor |
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| CN102842397B (en) | 2015-11-11 |
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