CN201549297U - Novel NTC thermistor sintering cushion block - Google Patents
Novel NTC thermistor sintering cushion block Download PDFInfo
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- CN201549297U CN201549297U CN200920243351XU CN200920243351U CN201549297U CN 201549297 U CN201549297 U CN 201549297U CN 200920243351X U CN200920243351X U CN 200920243351XU CN 200920243351 U CN200920243351 U CN 200920243351U CN 201549297 U CN201549297 U CN 201549297U
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- cushion block
- sintering
- ntc thermistor
- saggar
- thermistor sintering
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Abstract
The utility model discloses a novel NTC thermistor sintering cushion block which is used for padding inside a high temperature ceramic sagger, and is characterized in that a vent hole is arranged under the side wall of the high temperature ceramic sagger; the novel NTC thermistor sintering cushion block has tile edge structure made of high temperature ceramic; the novel NTC thermistor sintering cushion block has the height of 12mm, the width of each arris of 10mm, and the thickness of each arris of 5mm; and the angle between the adjacent edges of the novel NTC thermistor sintering cushion block is 60 degrees. The novel NTC thermistor sintering cushion block is beneficial to enhancing the air flow and heat transfer in the sintering process, leads a NTC thermosensitive chip to evenly form ceramic, and improves the resistance value of the chip and the consistency of B value. The novel NTC thermistor sintering cushion block has the price which is only 1/10 of the common zirconium plate, and can be used reversibly, thus being an ideal cushion block for sintering the power-type NTC thermistor chip.
Description
Technical field
The utility model relates to senser manufacturing technology field, is specifically related to a kind of novel sintered cushion block that is used to make power-type NTC thermistor.
Background technology
Power-type NTC thermistor (meaning disk type thermistor) is normally packed transition metal oxidation powder into and is pressed into circular base substrate in the mould, base substrate is contained to put in the refractory ceramics saggar to burn till in the high-temperature electric resistance furnace then to have spinel structure semiconductive ceramic chip.The saggar that uses at present is the square or circular saggar of flat shape.Practice shows, with the chip of this saggar sintering against the alms bowl bottom part with alms bowl upper part grain size, brightness has very big-difference, even the chip burning near saggar edge part occurs, and the chip in alms bowl centre does not become porcelain.Resistance value and the measurement of B value show that the electrical quantity of chip of saggar different parts is widely different, cause the consistent variation of product.Cause the main cause that this phenomenon takes place to be: atmosphere draught-free in the saggar, heat is unbalanced, the base substrate quick heating at saggar edge during intensification, the centre cooling is slow, make Impurity Distribution in the chip of different parts in the saggar, thermal stress state is incomplete same, makes the resistivity of material present very big difference; Simultaneously owing to interior can grade the in the chip, so the electronic state difference in the material (being the level of energy difference at electronics place) forms different B values.
Improve the check mark rate of product, improving yields is the target that the producer pursues.Studies show that: the relation of oxygen concentration can be write as when the resistivity of NTC thermistor and sintering: ρ=ρ
0E-
(C-Co) t, ρ in the formula
0The resistivity of material: Co is the oxygen content of oxide in the material during for C=Co, and C is the oxygen content in the sintering atmosphere, and T is the time of sintering. following formula shows that the oxygen content in the atmosphere is high more, and the duration is long more, and resistivity is low more.The relation of chip-resistance rate and sintering temperature can be write as: ρ=ρ
0e
Δ U/
Tρ in the formula
0During for sintering temperature, material resistance (can think the metallic resistance rate).Δ U is the interior energy of oxide material, and T is a sintering temperature.Sintering temperature is high more as can be seen, and the resistance value of chip is low more, and therefore how keeping the uniformity of the constant and temperature of base sheet sintering atmosphere is the key of sintering process, also is the difficult problem that the NTC thermistor faces at present.
At present, power-type NTC thermistor base sheet all adopts ceramic saggar sintering, and as mentioned above, it is non-constant to run into atmosphere, and temperature is difficulty uniformly, so resistance deviation ± 7%-± 10% of the chip of sintering, the consistency of B value is ± 2-± 3%.Although people adopt air blast and improve the uniformity of sintering furnace temperature, its effect is unsatisfactory.Recently, someone's saggar of will packing into buries burning with zirconium powder again, does not also obtain satisfied result.
For this reason, the utility model is exactly to have proposed a kind of new solution at above-mentioned deficiency of the prior art.
The utility model content
Problem to be solved in the utility model is, how a kind of New NTC thermistor sintering cushion block is provided, this novel NTC sintering cushion block has simple and reasonable, easy to use, advantages such as cost of manufacture is low, use this cushion block can not only make saggar atmosphere everywhere reach identical concentration, so that base substrate becomes the porcelain process to carry out in constant atmosphere and uniform temperature field at high temperature, make chip reach even structure, the all even defect density of Impurity Distribution is evenly distributed, realize high conforming chip, and the resistance dispersiveness of NTC thermistor chip can be dropped to ± below 5%, the consistency of B value is better than ± and 1%.
To achieve the above object of the invention, the technical scheme that the utility model adopted is: a kind of New NTC thermistor sintering cushion block is provided, is used for pad and is located in the refractory ceramics saggar, it is characterized in that, the sidewall below of described refractory ceramics saggar has air vent hole; Watt rib structure of described New NTC thermistor sintering cushion block for making by refractory ceramics; The height of described New NTC thermistor sintering cushion block is 12mm, and the width of every rib is 10mm, and the thickness of every rib is 5mm; Angle between the adjacent seamed edge of described New NTC thermistor sintering cushion block is 60 °.
According to New NTC thermistor sintering cushion block provided by the utility model, it is characterized in that described refractory ceramics saggar is circle or square structure.
According to New NTC thermistor sintering cushion block provided by the utility model, it is characterized in that the length of described New NTC thermistor sintering cushion block and width are less than the length and the width of the inside of refractory ceramics saggar.
According to New NTC thermistor sintering cushion block provided by the utility model, it is characterized in that, on the side at bottom surface 10mm place, have equally distributed 8 air vent holes at described refractory ceramics saggar.
According to New NTC thermistor sintering cushion block provided by the utility model, it is characterized in that the diameter of described air vent hole is 2mm-3mm.
By above-mentioned technical scheme as can be known, New NTC thermistor sintering cushion block provided by the utility model is made a watt rib structure by refractory ceramics (with the saggar homogeneous material), its size is slightly little with the interior end of saggar, can freely put into saggar, also can and become with polylith, the direct vertical setting of types of the base substrate of sintering has corrugated groove to carry out circulation of air below the base sheet on cushion block; Structure air flow passage at the bottom of the back side of watt rib piece and the saggar also is convenient to the convection current and the radiation of heat simultaneously; The below, side of saggar has air vent hole, air in the body of heater is flow in the saggar, make saggar atmosphere everywhere reach identical concentration, so that base substrate becomes the porcelain process to carry out in constant atmosphere and uniform temperature field at high temperature, make chip reach even structure, the all even defect density of Impurity Distribution is evenly distributed, and realizes high conforming chip.Use this cushion block the resistance dispersiveness of NTC thermistor chip can be dropped to ± below 5%, the consistency of B value is better than ± 1%, and the price of this pad only has 1/10 of zirconium plate price.
Description of drawings
Fig. 1 is provided with the structure chart of the refractory ceramics saggar of New NTC thermistor sintering cushion block for pad;
Fig. 2 is the cutaway view of New NTC thermistor sintering cushion block.
Wherein, 1, ventilation hole; 2, refractory ceramics saggar; 3, New NTC thermistor sintering cushion block.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described in detail.
As shown in the figure, this novel NTC sintering cushion block be used for the pad be located in the refractory ceramics saggar 2; The sidewall below of described refractory ceramics saggar 2 has air vent hole 1; Watt rib structure of described New NTC thermistor sintering cushion block 3 for making by refractory ceramics; The height of described New NTC thermistor sintering cushion block 3 is 12mm, and the width of every rib is 10mm, and the thickness of every rib is 5mm; Angle between the adjacent seamed edge of described New NTC thermistor sintering cushion block 3 is 60 °.
Described refractory ceramics saggar 2 is circle or square structure.The length of described New NTC thermistor sintering cushion block 3 and width are less than the length and the width of the inside of refractory ceramics saggar 2.On the side at bottom surface 10mm place, have equally distributed 8 air vent holes 1 at described refractory ceramics saggar 2.The diameter of described air vent hole 1 is 2mm-3mm.
New NTC thermistor sintering cushion block provided by the utility model is made a watt rib structure by refractory ceramics (with the saggar homogeneous material), its size is slightly little with the interior end of saggar, can freely put into saggar, also can and become with polylith, the direct vertical setting of types of the base substrate of sintering has corrugated groove to carry out circulation of air below the base sheet on cushion block; Structure air flow passage at the bottom of the back side of watt rib piece and the saggar also is convenient to the convection current and the radiation of heat simultaneously; The below, side of saggar has air vent hole, air in the body of heater is flow in the saggar, make saggar atmosphere everywhere reach identical concentration, so that base substrate becomes the porcelain process to carry out in constant atmosphere and uniform temperature field at high temperature, make chip reach even structure, the all even defect density of Impurity Distribution is evenly distributed, and realizes high conforming chip.Use this cushion block the resistance dispersiveness of NTC thermistor chip can be dropped to ± below 5%, the consistency of B value is better than ± 1%, and the price of this pad only has 1/10 of zirconium plate price.
Below the specific embodiment that adopts New NTC thermistor sintering cushion block provided by the utility model is done detailed description:
Example I
Adopt the square refractory ceramics saggar of 200mm * 200mm * 45mm, beat diameter in the side of refractory ceramics saggar far from the 10mm place of bottom surface and be 8 of the air vent holes of 3mm, even distribution.With making watt rib cushion block of 85mm * 85mm with the refractory ceramics powder of refractory ceramics saggar same material; The thickness of watt rib cushion block is 5mm, the width of watt rib is 10mm, highly be 12mm, the angle of watt rib is 60 ℃, four cushion blocks is tiled in the casket, then 1200 of the base sheets of the direct vertical setting of types 5D-9 of cushion block product, at 1160 ℃ of following sintering, (850 ℃ of reduction temperatures 30min), are surveyed R in the thermostat of 25 ℃ thermostats and 50 ℃ to burn till back chip perfecting Ag electrode
25And R
50Its result (100 chip mean value) is as following table:
| The material model | XH-34 |
| Base substrate (Φ 9 * 1.6) pressed density | 2.93g/cm 3 |
| Sintering temperature | 1120℃ |
| Sintered density | 4.87g/cm 3 |
| Shrinkage | 13.2％ |
| R25 | 5.023Ω |
| R50 | 2.42Ω |
| Resistance deviation ΔR/ R | ±3％ |
| B value deviation ΔB/ B | ±0.8％ |
The above results shows, depart from the chip resistance of of the present utility model watt of rib cushion block sintering and to be ± 3%, the B value departs from and is ± 0.8%, has improved 57.14% than the consistency of conventional zirconium board spacer sintering resistance, the consistency of B value by original ± 2% bring up to ± 0.8%.
Example II
Method by example I is carried out sintering to 8D-11 (Φ 11 * 1.8) product, and its result (mean values of 100 chips) is as following table:
| The material model | XH-68 |
| Base substrate (Φ 11 * 1.8) pressed density | 2.9g/cm 3 |
| The material model | XH-68 |
| Sintering temperature | 1180℃ |
| Sintered density | 4.82g/cm 3 |
| Shrinkage | 13.6％ |
| R25 | 7.96Ω |
| R50 | 3.81Ω |
| Resistance deviation | ±4.23％ |
| B value deviation | ±1.0％ |
The above results shows that with of the present utility model watt of rib cushion block sintering 8D-11 product, in resistance error ± 5%, B value error is ± 1.0%, compares the resistance uniformity with conventional structure and improves 50%, and B value consistency doubles.
EXAMPLE III
Adopt the method for example I that product 220 (Φ 5 * 1.3) is carried out sintering, measure its sintering parameter and electrical quantity, its result (100 chip mean value) is as following table:
| The material model | XH-309 |
| Base substrate (Φ 5 * 1.3) pressed density | 3.21g/cm 3 |
| Sintering temperature | 1080℃ |
| Shrinkage | 5.08g/cm 3 |
| R25 | 220.012Ω |
| R50 | 105.2Ω |
| Resistance value error | ±5.01％ |
| B value error | ±1.009％ |
The above results shows, the consistency that watt rib cushion block burns is grown tall with resistivity of material and descended, this mainly is that resistivity raises, and the chip size precision exerts an influence to homogeneity of product and causes.
EXAMPLE IV
Adopt the method for example I, to the product of high resistivity material prescription XH-93,47D-15 carries out sintering, its result such as following table (100 chip mean value):
| The material model | XH-93 |
| Base substrate (Φ 15 * 2.8) pressed density | 2.9g/cm 3 |
| Sintering temperature | 1270℃ |
| Shrinkage | 4.82g/cm 3 |
| R25 | 46.46Ω |
| R50 | 20.45Ω |
| Resistance value error | ±3.4％ |
| B value error | ±0.96％ |
The above results shows, for XH-93 (high resistance formula materials) adopt dispersed little ± 5.0% of watt rib cushion block sintering resistance value, the consistency of B value be better than ± 1.0%.
The presentation of results of example I, example II, EXAMPLE III and EXAMPLE IV, adopt the resistance consistency and the B value consistency of the NTC thermistor product of New NTC thermistor sintering cushion block of the present utility model manufacturing to increase substantially, and the sintering of different-diameter and resistivity material is evenly had same effect.
Though the embodiment to this patent is described in detail in conjunction with the accompanying drawings, those skilled in the art do not need the protection range that various modifications that creative work can carry out or distortion still belong to this patent in the described protection range of this patent claims.
Claims (5)
1. a New NTC thermistor sintering cushion block is used for pad and is located in the refractory ceramics saggar (2), it is characterized in that, the sidewall below of described refractory ceramics saggar (2) has air vent hole (1); Watt rib structure of described New NTC thermistor sintering cushion block (3) for making by refractory ceramics; The height of described New NTC thermistor sintering cushion block (3) is 12mm, and the width of every rib is 10mm, and the thickness of every rib is 5mm; Angle between the adjacent seamed edge of described New NTC thermistor sintering cushion block (3) is 60 °.
2. New NTC thermistor sintering cushion block according to claim 1 is characterized in that described refractory ceramics saggar (2) is circle or square structure.
3. New NTC thermistor sintering cushion block according to claim 1 and 2 is characterized in that the length of described New NTC thermistor sintering cushion block (3) and width are less than the length and the width of the inside of refractory ceramics saggar (2).
4. New NTC thermistor sintering cushion block according to claim 3 is characterized in that, has equally distributed 8 air vent holes (1) at described refractory ceramics saggar (2) on the side at bottom surface 10mm place.
5. New NTC thermistor sintering cushion block according to claim 4 is characterized in that the diameter of described air vent hole (1) is 2mm-3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920243351XU CN201549297U (en) | 2009-11-19 | 2009-11-19 | Novel NTC thermistor sintering cushion block |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920243351XU CN201549297U (en) | 2009-11-19 | 2009-11-19 | Novel NTC thermistor sintering cushion block |
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| Publication Number | Publication Date |
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| CN201549297U true CN201549297U (en) | 2010-08-11 |
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|---|---|---|---|
| CN200920243351XU Expired - Fee Related CN201549297U (en) | 2009-11-19 | 2009-11-19 | Novel NTC thermistor sintering cushion block |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104990409A (en) * | 2015-06-30 | 2015-10-21 | 重庆科技学院 | Crucible and method for preparing bismuth ferrite target with texture characteristics through same |
-
2009
- 2009-11-19 CN CN200920243351XU patent/CN201549297U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104990409A (en) * | 2015-06-30 | 2015-10-21 | 重庆科技学院 | Crucible and method for preparing bismuth ferrite target with texture characteristics through same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100811 Termination date: 20141119 |
|
| EXPY | Termination of patent right or utility model |