CN104671746B - A kind of thermistor potsherd, thermistor and preparation method thereof - Google Patents
A kind of thermistor potsherd, thermistor and preparation method thereof Download PDFInfo
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- CN104671746B CN104671746B CN201510073475.8A CN201510073475A CN104671746B CN 104671746 B CN104671746 B CN 104671746B CN 201510073475 A CN201510073475 A CN 201510073475A CN 104671746 B CN104671746 B CN 104671746B
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Abstract
The invention discloses a kind of thermistor potsherd, thermistor with and preparation method thereof.Thermistor potsherd, sinter and form after using cold isostatic compaction technological forming under 50~500MPa briquetting pressure by mix powder；The mix powder includes transition metal oxide powder and rare earth oxide, and the transition metal oxide powder includes the component of following content：By mole calculating, 30%~70% cobaltosic oxide Co3O4, 20%~60% manganese dioxide MnO2, 5%~20% cupric oxide CuO；The rare earth oxide is yttria Y2O3Or lanthana La2O3, the quality of the rare earth oxide is the 1%~10% of the transition metal oxide powder quality.By the thermistor potsherd and a pair of electrodes, thermistor is made in a pair of lead wires and insulating materials.The B values of obtained thermistor, specified electrical current, impact resistance electric capacity are higher.
Description
【Technical field】
The present invention relates to thermistor element, more particularly to a kind of thermistor potsherd, thermistor and its preparation
Method.
【Background technology】
Electronic and electrical equipment, the particularly electronic equipment with high-power AC-DC power supplys, are usually concatenated in its performance loop
One or more power-type NTC themistor elements, for suppressing surge current during electronic equipment start, so as to protect electricity
Sub- equipment exempts from destruction.NTC themistor element typically adds electrode by thermistor potsherd, is made after coating insulating materials
Into.Thermistor potsherd is typically formed by transition metal oxide powder sintering.Existing transition metal oxide powder
Component and content have compared with many body system, more formula.The potsherd obtained under various systems and formula, the B of obtained thermistor
The performance such as value, specified electrical current, impact resistance electric capacity is different.High performance power-type NTC thermistor is then that people chase after
The target asked.High performance power type NTC thermistor has that material constant (B values) is big, residual resisitance is small, big, work of bearing electric current
The features such as making strong ability, dependable performance, long lifespan.
【The content of the invention】
The technical problems to be solved by the invention are：Above-mentioned the deficiencies in the prior art are made up, propose a kind of thermistor pottery
Ceramics, thermistor and preparation method thereof, the B values of obtained thermistor, specified electrical current, impact resistance electric capacity are higher.
The technical problem of the present invention is solved by following technical scheme：
A kind of thermistor potsherd, by mix powder under 50~500MPa briquetting pressure using isostatic cool pressing into
Sintering forms after type technological forming；The mix powder includes transition metal oxide powder and rare earth oxide, the mistake
Crossing metal oxide powder includes the component of following content：By mole calculating, 30%~70% cobaltosic oxide
Co3O4, 20%~60% manganese dioxide MnO2, 5%~20% cupric oxide CuO；The rare earth oxide is yttria
Y2O3Or lanthana La2O3, the quality of the rare earth oxide is the 1%~10% of the transition metal oxide powder quality.
A kind of preparation method of thermistor potsherd, comprises the following steps：1) by cobaltosic oxide Co3O4, manganese dioxide
MnO2According to molar percentage it is (30%~70%) with cupric oxide CuO：(20%~60%)：(5%~20%) is mixed,
Calcined after mixing, transition metal oxide powder is made；2) rare earth oxide is added in the transition metal oxide powder
Mix powder is obtained, the rare earth oxide is yttria Y2O3Or lanthana La2O3, the matter of the rare earth oxide
Measure as the 1%~10% of the transition metal oxide powder quality；3) by mix powder 50~500MPa shaping pressure
Power, using cold isostatic compaction technological forming into the green sheet being sized；4) after green sheet is sintered, the temperature-sensitive electricity is made
Hinder potsherd.
A kind of thermistor, including thermistor potsherd, a pair of electrodes, a pair of lead wires and insulating materials, it is the pair of
Electrode is separately positioned on the two sides of the thermistor potsherd, and the pair of lead is respectively welded at the pair of electrode
On, the insulating materials is coated on thermistor potsherd and the electrode periphery；The thermistor potsherd is as above institute
The thermistor potsherd stated.
A kind of preparation method of thermistor, comprises the following steps：Prepare thermistor potsherd as described above；Institute
State the slurry that printed electrode on the two sides of thermistor potsherd, sintering, the shape on the two sides of the thermistor potsherd
Electrode in a pair；A pair of lead wires is respectively welded on the pair of electrode；In the thermistor potsherd and electrode periphery
One layer of insulating materials is coated, the thermistor is made.
The beneficial effect that the present invention is compared with the prior art is：
The thermistor potsherd of the present invention, adds appropriate rare-earth oxidation on the basis of transition metal oxide powder
Thing, the new blend powder under certain formula system is obtained, using cold isostatic compaction so that mixed in the green sheet for being molded to obtain
The distribution uniform of compound powder, be not in that material is reunited, the grainiess too grown up be present, so as to from formula and be formulated
The B values of thermistor, specified electrical current, impact resistance electric capacity are higher made from ensuring in terms of distribution two.According to experiment test
As a result, thermistor made from aforesaid way, than the thermistor of existing comparable size, B values are higher by 500~600, specified logical
Electric current is higher by 1~7A, and impact resistance electric capacity is higher by 70~2500 μ F.
【Brief description of the drawings】
Fig. 1 is the structural representation of the thermistor in the specific embodiment of the invention.
【Embodiment】
With reference to embodiment and compare accompanying drawing the present invention is described in further details.
Embodiment
In present embodiment, thermistor potsherd is prepared first, during preparation：
1) by mole calculating, by 30%~70% cobaltosic oxide Co3O4, 20%~60% manganese dioxide
MnO2, 5%~20% cupric oxide CuO mixed, calcined after mixing, and transition metal oxide powder is made.Preferably, four
Co 3 O Co3O4Molar percentage be 40-60%, manganese dioxide MnO2Molar percentage be 30-50%.When four oxidations
The content of three cobalts and manganese dioxide is in above range, when can make thermistor made of potsherd subsequently is made, resistivity phase
To relatively low, and B values are of a relatively high.
2) rare earth oxide is added in transition metal oxide powder and obtains mix powder.Wherein, rare earth oxide
For yttria Y2O3Or lanthana La2O3, the quality of rare earth oxide for transition metal oxide powder quality 1%~
10%.Preferably, the quality of rare earth oxide is the 2%~5% of transition metal oxide powder quality.When rare earth oxide
Addition within the range when, the influence to the electrical property of obtained potsherd is little, but can impact the anti-current of potsherd
Ability is preferable.
3) by mix powder, under 50~500MPa briquetting pressure, using cold isostatic compaction technological forming into setting
The green sheet being sized.Preferably, the briquetting pressure of cold isostatic compaction technique is：200~300MPa.
4) green sheet is sintered into thermistor potsherd.
After thermistor potsherd is made, thermistor is made after addition electrode, lead, insulating materials.Detailed process is such as
Under：
5) print electrode slurry, sintering on the two sides of thermistor potsherd, in the thermistor potsherd
A pair of electrodes is formed on two sides.Preferably, electrode uses silver palladium alloy, and the wherein mass fraction of palladium is 1%~10%, preferably
For 3%~6%, so as to which the weldability of silver-colored palladium slurry electrode material is preferable.
6) a pair of lead wires is respectively welded in a pair of electrodes.The material of lead is fine copper, copper is silver-plated or fine silver, preferably
For the silver-plated material of copper.During welding, it is preferred to use argentiferous scolding tin is so as to improving the electric conductivity between electrode and lead.Wherein silver-colored contains
Amount accounts for 0.1%~5% in argentiferous soldering tin material.Preferably, silver-colored content accounts for 3%~4%.Silver in argentiferous soldering tin material
Content within the range when, and when electrode uses silver palladium alloy, can effectively control ag material during welding in electrode to move to
In soldering tin material, the use of argentiferous soldering tin material is avoided to have impact on the electric conductivity of electrode material.
7) in one layer of insulating materials of thermistor potsherd and the coating of electrode periphery, the thermistor is made.
The structure chart of obtained thermistor represents thermistor potsherd as shown in figure 1, in figure, 1, and 2 represent electrodes, 3
Lead is represented, 4 represent soldering tin material, and 5 represent insulation material layer.
In present embodiment, metal oxide powder is prepared according to certain formula, and addition is appropriate on this basis
Rare earth oxide, obtain mix powder.The mix powder is used into cold isostatic compaction technological forming so that after shaping
Green sheet in the material of mix powder be evenly distributed, the grainiess that no material is reunited or too grown up, so as to from
The B values of thermistor, specified electrical current, impact resistance electric capacity are higher made from making in terms of the distribution two of side and formula materials.
The improvement being formulated merely can improve made from thermistor B values, but in present embodiment from formula and formula materials
The aspect of distribution two, to ensure 3 performances：B values, specified electrical current, impact resistance electric capacity are higher.
It is as follows, by setting multiple embodiments, verify the performance parameter of obtained thermistor in present embodiment.
Embodiment 1：
(1) by Co3O4、MnO2, CuO powder proportionally (molar percentage) 50%：45%：5% is mixed, 800
6h is calcined at DEG C.
(2) Y of its 5% mass ratio is added in the transition metal oxide powder mixed2O3, it is well mixed, is mixed
Compound powder.
(3) it is a diameter of using cold isostatic compaction under 300Mpa pressure by mix powder made from step (2)
22mm, thickness are 2mm raw embryo piece.
(4) raw embryo piece is burnt till into thermistor potsherd at 1100 DEG C.
(5) in relative two face of thermistor potsherd, the silver of 5% (mass fraction) palladium is contained by silk-screen printing
The electrode slurry of palldium alloy, then sintered 10 minutes at 800 DEG C, form silver-colored palladium electrode.
(6) with the soldering tin material that silver content is 3.5% mass ratio, two a diameter of 1 millimeter of silver-plated leads are welded respectively
It is connected on two relative electrodes.
(7) one layer of silicone insulation material is coated on thermistor, negative tempperature coefficient thermistor is made.
Test and comparing result：The thermistor prepared by above method, the resistance value at 25 DEG C are 5 ohm, heat
Quick material constant B values are 3500, and specified electrical current is 15A, can tolerate 4700 μ F impacting electric capacity.And identical chi on the market
Very little and resistance product, B values are 3000, and specified electrical current is 8A, can tolerate 2200 μ F impacting electric capacity.By contrasting, this
The performance for the thermistor that embodiment provides is substantially better than existing product.
Embodiment 2：The present embodiment and the difference of embodiment 1 are：Constituent content is different：By Co3O4、MnO2、CuO
Powder proportionally (molar percentage) 50%：40%：10% carries out being mixed to form transition metal oxide powder.Rare-earth oxidation
The mass ratio of thing addition is different.The size being molded in preparation process is different.
Specific preparation process is as follows in the present embodiment：
(1) by Co3O4、MnO2, CuO powder proportionally (molar percentage) 50%：40%：10% is mixed,
6h is calcined at 800 DEG C.
(2) Y of its 3% mass ratio is added in the transition metal oxide powder mixed2O3, it is well mixed.
(3) it is a diameter of using cold isostatic compaction under 200Mpa pressure by mix powder made from step (2)
9.5mm, thickness are 1.2mm raw embryo piece.
(4) raw embryo piece is burnt till into thermistor potsherd at 1100 DEG C.
(5) in relative two face of thermistor potsherd, the silver of 5% (mass fraction) palladium is contained by silk-screen printing
The electrode slurry of palldium alloy, then sintered 10 minutes at 800 DEG C, form silver-colored palladium electrode.
(6) with the soldering tin material that silver content is 3.5% mass ratio, two a diameter of 0.6 millimeter of silver-plated leads are distinguished
It is welded on two relative electrodes.
(7) one layer of silicone insulation material is coated on thermistor, negative tempperature coefficient thermistor is made.
Test and comparing result：The thermistor prepared by above method, the resistance value at 25 DEG C are 5 ohm, heat
Quick material constant B values are 3300, and specified electrical current is 4.5A, can tolerate 220 μ F impacting electric capacity.And identical chi on the market
Very little and resistance product, B values are 2800, and specified electrical current is 3A, can tolerate 150 μ F impacting electric capacity.Pass through contrast, this reality
The performance for applying the thermistor of example offer is better than existing product.
Embodiment 3：The present embodiment and the difference of embodiment 1 are：Constituent content is different：By Co3O4、MnO2、CuO
Powder proportionally (molar percentage) 50%：43%：7% carries out being mixed to form transition metal oxide powder.And prepare
During the size that is molded it is different, in the present embodiment, cold isostatic compaction size is a diameter of 14mm in step (3), thick
Spend the raw embryo piece for 1.3mm.Remaining step is in the same manner as in Example 1, not repeat specification herein.
Test and comparing result：Obtained thermistor, the resistance value at 25 DEG C is 5 ohm, and thermo-sensitive material constant B values are
3400, specified electrical current is 5A, can tolerate 1200 μ F impacting electric capacity.And identical size on the market and the product of resistance, B
It is worth for 2800, specified electrical current is 4A, can tolerate 800 μ F impacting electric capacity.By contrast, the temperature-sensitive electricity that the present embodiment provides
The performance of resistance is substantially better than existing product.
Embodiment 4：The present embodiment and the difference of embodiment 1 are：The species and quality of the rare earth oxide of addition
Fraction is different, and in the present embodiment in step (2), its 3% mass is added in the transition metal oxide powder mixed
The lanthana La of ratio2O3.Remaining step is in the same manner as in Example 1, not repeat specification herein.
Test and comparing result：Obtained thermistor, the resistance value at 25 DEG C is 5 ohm, and thermo-sensitive material constant B values are
3500, specified electrical current is 15A, can tolerate 3300uF impacting electric capacity.And identical size on the market and the product of resistance,
B values are 3000, and specified electrical current is 8A, can tolerate 2200uF impacting electric capacity.The temperature-sensitive provided by contrast, the present embodiment
Resistive performance is slightly worse than the thermistor in embodiment 1, but is equally better than existing product.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to is assert
The specific implementation of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
Some replacements or obvious modification are made on the premise of not departing from present inventive concept, and performance or purposes are identical, should all be considered as
Belong to protection scope of the present invention.
Claims (10)
- A kind of 1. thermistor potsherd, it is characterised in that：Used by mix powder under 50~500MPa briquetting pressure Sintering forms after cold isostatic compaction technological forming；The mix powder includes transition metal oxide powder and rare-earth oxidation Thing, the transition metal oxide powder are made up of the component of following content：By mole calculating, the four of 30%~70% Co 3 O Co3O4, 20%~60% manganese dioxide MnO2, 5%~20% cupric oxide CuO；The rare earth oxide is three Y 2 O Y2O3Or lanthana La2O3, the quality of the rare earth oxide is the transition metal oxide powder quality 1%~10%.
- 2. thermistor potsherd according to claim 1, it is characterised in that：The quality of the rare earth oxide is described The 2%~5% of transition metal oxide powder quality.
- 3. thermistor potsherd according to claim 1, it is characterised in that：The cobaltosic oxide Co3O4Moles hundred It is 40-60% to divide ratio, manganese dioxide MnO2Molar percentage be 30-50%.
- A kind of 4. preparation method of thermistor potsherd, it is characterised in that：Comprise the following steps：1) by cobaltosic oxide Co3O4, manganese dioxide MnO2According to molar percentage it is (30%~70%) with cupric oxide CuO：(20%~60%)：(5%~ 20%) mixed, calcined after mixing, is made by cobaltosic oxide Co3O4, manganese dioxide MnO2With the mistake of cupric oxide CuO compositions Cross metal oxide powder；2) rare earth oxide is added in the transition metal oxide powder and obtains mix powder, institute It is yttria Y to state rare earth oxide2O3Or lanthana La2O3, the quality of the rare earth oxide is the oxo transition metal The 1%~10% of compound powder quality；3) by mix powder 50~500MPa briquetting pressure, using cold isostatic compaction Technological forming is into the green sheet being sized；4) after green sheet is sintered, the thermistor potsherd is made.
- 5. the preparation method of thermistor potsherd according to claim 4, it is characterised in that：In the step 2), institute The quality for stating rare earth oxide is the 2%~5% of the transition metal oxide powder quality.
- 6. the preparation method of thermistor potsherd according to claim 4, it is characterised in that：, will in the step 3) Mix powder 200~300MPa briquetting pressure, using cold isostatic compaction technological forming.
- 7. a kind of thermistor, including thermistor potsherd, a pair of electrodes, a pair of lead wires and insulating materials, the pair of electricity Pole is separately positioned on the two sides of the thermistor potsherd, and the pair of lead is respectively welded at the pair of electrode On, the insulating materials is coated on thermistor potsherd and the electrode periphery；It is characterized in that：The thermistor ceramics Piece is the thermistor potsherd described in claim any one of 1-3.
- 8. thermistor according to claim 7, it is characterised in that：The material of the electrode is silver palladium alloy, wherein palladium Mass fraction be 1%~10%.
- 9. thermistor according to claim 7, it is characterised in that：The material of the lead is fine copper, copper is silver-plated or pure Silver.
- A kind of 10. preparation method of thermistor, it is characterised in that：Comprise the following steps：Prepare such as any one of claim 1-3 Described thermistor potsherd；Print electrode slurry, sintering on the two sides of the thermistor potsherd, in the heat A pair of electrodes is formed on the two sides of quick resistor ceramic piece；A pair of lead wires is respectively welded on the pair of electrode；Described One layer of insulating materials of thermistor potsherd and the coating of electrode periphery, is made the thermistor.
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| CN109411171B (en) * | 2018-10-24 | 2020-09-18 | 北京控制工程研究所 | Preparation method of negative temperature coefficient bead thermistor |
| CN109727740B (en) * | 2018-12-29 | 2021-11-23 | 肇庆鼎晟电子科技有限公司 | High-precision high-reliability laminated thermistor chip and manufacturing method thereof |
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| CN101882490B (en) * | 2010-03-25 | 2012-06-27 | 中国科学院新疆理化技术研究所 | Rare earth oxide doped negative temperature coefficient thermistor material |
| CN102568722B (en) * | 2012-01-05 | 2014-06-04 | 深圳顺络电子股份有限公司 | SMD (surface mounted device) thermistor and manufacturing method thereof |
| CN104150880A (en) * | 2014-06-27 | 2014-11-19 | 句容市博远电子有限公司 | Manganese-cobalt-copper thermistor material |
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Non-Patent Citations (1)
| Title |
|---|
| "La2O3掺杂对Mn-Co-Ni系NTC热敏电阻材料性能的影响";王忠兵等;《电子元件与材料》;20121231;第31卷(第12期);第22-25页 * |
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