CN2731893Y - Ceramic heater and oxygen probe using same - Google Patents
Ceramic heater and oxygen probe using same Download PDFInfo
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- CN2731893Y CN2731893Y CNU2004200871663U CN200420087166U CN2731893Y CN 2731893 Y CN2731893 Y CN 2731893Y CN U2004200871663 U CNU2004200871663 U CN U2004200871663U CN 200420087166 U CN200420087166 U CN 200420087166U CN 2731893 Y CN2731893 Y CN 2731893Y
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Abstract
The utility model relates to a ceramic heater. Along the lengthwise direction of the figure, the heating resistor formed on a ceramic sheet is divided into three parts with the same size. To suppose the average value of the line width at the central part is Ps, to suppose the average value of the line width at the outer side is Po, the Ps is smaller than the Po. The temperature highest part of the heating resistor forming part of the ceramic heater of the utility model contacts with the inner wall of an oxygen sensor, or is set to approach to 0.5 mm and to be smaller than 0.5 mm, and thus an oxygen sensor with the advantages of good durability and good heating-up performance can be provided. The ceramic heater solves the problems existing in the bygone ceramic heater, and the line width of the heating resistor of the bygone ceramic heater formed in an integral uniformity mode has problems from the point of view of the fast heating-up performance.
Description
Technical field
The utility model relate to a kind of be used for automobile with the heater of air-fuel ratio detecting sensor, vaporizer with heater and flatiron with ceramic heaters such as heaters.
Background technology
In the past, normally used is to imbed the heating resistor that is made of refractory metals such as W, Re, Mo and the aluminium ceramic heater that forms in main component is the pottery of aluminium oxide.
For example, when making normally used cylindrical ceramic heater, as shown in Figure 1, 2, prepare ceramic core 2 and potsherd 3, on a side interarea of potsherd 3, contain in printing refractory metals such as W, Re, Mo thickener, form heating resistor 4 and electrode lead-out part 5 after, make above-mentioned interarea become the inboard, around above-mentioned ceramic core 2, twine potsherd 3, can be by it wholely is sintered into one and obtains ceramic heater 1.
In addition, on potsherd 3 as shown in Figure 1, direct connection electrode lead division 5 on heating resistor 4, and form through hole 6 at the end of this electrode lead-out part 5, connect electrode pad 7 and this electrode lead-out part 5 at the back sides by through hole 6.Also can inject the conductor thickener in case of necessity to through hole 6.
Wherein, as shown in Figure 2, the heating resistor 4 that forms on potsherd 3 is the figure that crawls, and is connected with electrode lead-out part 5 in its back-end.For screen printing is carried out easily, the thickness of this heating resistor 4 is made as about 10～30 μ m.In addition, be formed with electrode pad 7, between electrode lead-out part 5 and electrode pad 7, form through hole 6, become the structure of conducting at the back side of potsherd 3.
Therefore, on final ceramic heater 1, adopt the method for welding or crimping, lead 8 is joined on the electrode pad 7 that exposes the side, certainly these lead 8 energisings.
In addition, as the high temperature heater more than 1000 ℃, also use silicon nitride ceramic heater 1, its structure is, in the silicon nitride pottery, imbed the heating resistor 4 that constitutes by refractory metal line etc., make the terminal exposing surface that connects the electrode lead-out part 5 on it and, lead 8 is joined on this electrode pad 7 with scolders such as silver as electrode pad 7.
As shown in Figure 7, ceramic heater 1 in the past can make the live width P of built-in heating resistor 4 evenly form.
These ceramic heaters 1 have good anti-corrosion and durability, and can be rapidly heated, thus the igniting that can be used on various burning machines such as kerosene heater with heater, fired vapour device with the heating fluid of heater, heating water or other fluid with various transducers such as heater, lambda sensor with measure the heater of machine.
In oxygen sensor in use for car,, in ceramic heater 1, use the system that adds heated oxygen sensor 14 for lambda sensor 14 being quickly heated up to working temperature when the cold-starting.In recent years, follow the reinforcement of waste gas restriction, the rising characteristic in the time of must improving cold-starting is even need a kind of high-durability ceramic heater 1 that also can use under the hot environment more than 800 ℃.Yet, if increase caloric value, the shortening heating-up time of ceramic heater 1, particularly when the cold-starting of cooled engine, because of the time behind the applied voltage longer, the excessive change of temperature appears, the electrode of damage lambda sensor 14, the durability of reduction ceramic heater 1, the temperature that also occurs electrode pad 7 in addition raises, the situation of broken string.
At above-mentioned problem, a kind of ceramic heater (spy opens flat 8-273813 communique) has been proposed, ceramic heater 1, on the potsherd 3 that with the aluminium nitride is main component, printing has the arbitrary shape that electrode is made of taking-up portion 5 and heating resistor 4 one and the heating figure of thickness, and is connecting with above-mentioned heating resistor 4 and connect and the conductive materials bigger than the thermal resistivity of heating resistor 4.
In addition, with the such lambda sensor of ceramic heater 1 heating the time, be provided in a side of the central portion 4a of ceramic heater 1 up to now, along the circumferential direction evenly add heated oxygen sensor 14.But the early stage work of lambda sensor 14 is target because of with engine cold-starting the time, thus needn't evenly heat the whole circumference direction, as long as add the part of heated oxygen sensor 14 just can fully work (spy opens the 2000-193633 communique).
In addition, if the known ceramic heater 1 that is rapidly heated, the highest of temperature crackle can appear then, so, thermal shock when being rapidly heated, prevent that crackle from appearring in the surface of ceramic heater 1 in order to relax, the live width that suggestion makes heating resistor 4 outsides reduces the Temperature Distribution (spy opens the 2001-15252 communique) of heat generating part circumferencial direction less than central portion 4a.
Yet, opening ceramic heater 1 in the 2000-193633 communique about the spy, the live width P of heating resistor 4 is that whole uniformity forms, so be problematic from the viewpoint that is rapidly heated.
On the other hand, open in the 2001-15252 communique the spy, though can prevent that crackle from appearring in surface of ceramic body, because of the live width P of heating resistor 4 outside 4b attenuates, so just produced the endurance issues of ceramic heater 1.
The utility model content
The feature of ceramic heater of the present utility model is, the potsherd that will on side's interarea, form heating resistor and constitute, so that closely connected mode one sintering on ceramic core circumference forms above-mentioned interarea, the heating resistor that forms on the above-mentioned potsherd, be divided into three along the length direction of figure, when the average of the live width of the central portion of establishing this heating resistor is Ps, when the average of the live width at two ends is Po, Ps＜Po then.
In addition, the feature of ceramic heater of the present utility model is, the live width of the central portion of the heating resistor that forms on above-mentioned potsherd be made as P1, laterally successively live width is made as P2 ..., during Pn, then P1≤P2≤... ≤ Pn, and P1＜Pn.
In addition, the feature of ceramic heater of the present utility model also has, with respect to Pn, the live width P1 of above-mentioned heating resistor be its 50～95%.
And the feature of ceramic heater of the present utility model also has, and the maximum temperature portion of heating resistor formation portion and the inwall of lambda sensor contact or are made as near in the 0.5mm.
(utility model effect)
According to the utility model, with above-mentioned interarea closely connected on ceramic core circumference mode, will on side's interarea, form heating resistor and the potsherd one sintering that constitutes forms, the heating resistor that forms on the above-mentioned potsherd is divided into three, when the average of the live width of the central portion of establishing this heating resistor is Ps, when the average of the live width at two ends is Po, then Ps＜Po thus, can provide the lambda sensor that a kind of durability is good and temperature-raising characteristic is good.
In addition, ceramic heater of the present utility model, the potsherd that will on side's interarea, form heating resistor and constitute, so that the closely connected mode one sintering on ceramic core circumference of above-mentioned interarea is formed, the live width of the above-mentioned heating resistor of central portion is made as P1 on above-mentioned potsherd, live width laterally is made as P2 successively, during Pn, then P1≤P2≤... ≤ Pn, and P1＜Pn, and the live width P1 of above-mentioned heating resistor is 50～95% with respect to Pn, and, the highest of the temperature of the heating resistor formation portion of ceramic heater of the present utility model contacts with the inwall of lambda sensor or is set near in 0.5mm, thus, can provide the lambda sensor that a kind of durability is good and temperature-raising characteristic is good.
Description of drawings
Fig. 1 is the stereogram of common ceramic heater.
Fig. 2 is the expanded view of common ceramic heater.
Fig. 3 is the suitable cutaway view of X-X with ceramic heater Fig. 1 of the present utility model.
Fig. 4 is the concept map of figure of the heating resistor of expression ceramic heater of the present utility model.
Fig. 5 is the cutaway view of other embodiment of expression ceramic heater of the present utility model.
Fig. 6 is the cutaway view of an embodiment of expression lambda sensor of the present utility model.
Fig. 7 is the cutaway view of ceramic heater in the past.
Among the figure: 1-ceramic heater, 2-pottery core, 3, the 10-potsherd, 4-heating resistor, the 4a-central portion, the 4b-outside, 5-electrode lead-out part, 6-through hole, the 7-electrode pad, 8-lead, 9-slot part, the 11-scolder, 12-heating resistor formation portion, 14-lambda sensor, the 14a-inwall, the 21-thermocouple, the P-figure is wide, the f-length of generating heat, g-gap, the highest portion of m-temperature.
Embodiment
Below, the embodiment of ceramic heater of the present utility model is described with accompanying drawing.
Fig. 1 is the stereogram of common ceramic heater 1, and Fig. 2 is its expanded view.
Its structure is to be formed with heating resistor 4 and electrode lead-out part 5 on the surface of potsherd 3, and and the electrode pad 7 that forms of its back side between engage with through hole 6.With the potsherd 3 prepared like this, with above-mentioned heating resistor 4 as inboard, on the surface of ceramic core 2, carry out forming ceramic heater 1 along the closely connected sintering of circumference.
At this moment, shown in the cutaway view of Fig. 3, the gap portion that potsherd 3 does not cover core body 2 becomes slot part 9.
The feature of ceramic heater 1 of the present utility model is, will the potsherd 3 that forms heating resistor 4 on side's interarea, form in that above-mentioned interarea and 2 implementations of ceramic core are sintered into one after closely connected along circumference 1, for example, in heating resistor shown in Figure 44 expanded views, when the average of the live width of the central portion 4a that establishes this heating resistor 4 is that the average of the live width of Ps, both ends 4b is Po, then Ps＜Po.
For example, the average Po of this live width, Pn as shown in Figure 4, when the round line part mark of heating resistor 6 is 6, can be divided into 2 and 4 of its both sides of central portion, thereby can on average cuts apart and obtain respectively average.
By the live width average Ps of heating resistor 4 central portion 4a as its outside 4b live width average Po, the resistance value of central portion 4a line can be higher than the resistance value of out conductor, thus the temperature of central portion 4a can be higher than the outside.
Thus, ceramic heater 1 is rapidly heated.
Particularly when the live width of the figure that enlarges most peripheral, because of the heat generating part of peripheral direction narrows down, so but localized heating ceramic heater 1, and, can improve the intensification performance of lambda sensor by making the inwall of this local heating part near lambda sensor.
Be used to detect the lambda sensor of general widely used chemically correct fuel,, then can detect oxygen concentration, so can improve the service behaviour of lambda sensor by the utility model if the part of the test section of lambda sensor is heated to more than the working temperature.
The low-temperature working of recent lambda sensor is good, as long as be heated to more than 300 ℃, lambda sensor is just started working.
In addition, the figure live width at central portion 4a place of establishing the heating resistor 4 of ceramic heater 1 of the present utility model is P1, successively laterally the slot part 9 of 4b be P2, P3 ..., during Pn, then P1≤P2≤... ≤ Pn, and P1＜Pn are according to the above-mentioned wide P of related key nodel line.At this moment, preferred live width P1 is 50～95% of live width Pn.More preferably 50%～80%.
If the ratio of live width P is in above-mentioned scope, be because if the live width P1 of heating resistor 4 central portion 4a surpass outside 4b live width Pn 95%, then the Temperature Distribution on ceramic heater 1 surface diminishes, so the temperature rising can expend time in, make rise to time of working temperature as the lambda sensor 14 that is heated object will be elongated.
On the contrary, if less than 50% of live width Pn, then generating heat, above-mentioned live width P1 concentrates on the central portion 4a of heating resistor 4, so crackle appears in this central portion 4a easily.Relative therewith, if above-mentioned live width P1 is 50～95% of live width Pn, then can prevent that crackle from appearring in the surface of ceramic heater 1 simultaneously quickly heating up to working temperature as the lambda sensor 14 that is heated object.
In addition, as shown in Figure 3, also there is increase not form the angle C of heating resistor 4 figures, the method for localized heating heat generating part.At this moment, making angle C is more than 60 °, or relatively the live width of central portion average Po the live width Pn broadening to 10% at heating resistor 4 two ends with on suppress the heating at two ends, like this, can promote the heating of its inboard, be easy to localized heating.
And if make the live width Pn at heating resistor 4 two ends suppress the heating at two ends greater than the average live width Po of central portion 4a, then heating area can promote localized heating less than apparent angle C.
As shown in Figure 5, for the figure section of heating resistor 4, be benchmark with slot part 9, for example also can be limited in 90 ° to 270 ° the scope and dispose figure.Why being to be the design that benchmark is provided with Temperature Distribution with slot part 9, is because when on lambda sensor 14 ceramic heater 1 is set, makes the highest m contact of the temperature lambda sensor 14 of ceramic heater 1, the cause of the raising heat efficiency.For from judging the highest m of temperature in appearance, should be designed to be benchmark, have the highest m of temperature 180 ° position with slot part 9.
And as shown in Figure 6, a part of inner peripheral surface or adjacency by the highest the m of temperature that makes ceramic heater 1 of the present utility model contacts lambda sensor 14 can make lambda sensor 14 work efficiently.At this moment, the highest m of heating resistor 4 ground temperature is located at the position of contiguous lambda sensor 14 inner peripheral surfaces.At this moment, the interval g of ceramic heater 1 and lambda sensor 14 inwall 14a is preferably below 0.5mm, further preferably below 200 μ m.
Lambda sensor 14 is worked under 350 ℃～400 ℃ conditions.In addition, needn't add heated oxygen sensor 14 integral body, just can work as long as can add a part to this temperature province of heated oxygen sensor 14.Therefore, as shown in Figure 6, heating formation portion 12 sides by making ceramic heater 1 heat near the inwall 14a of lambda sensor 14, and the heat that ceramic heater 1 generates can pass to this lambda sensor 14 effectively.Can make with identical power consumption and to shorten 10～20% heating time.
Like this,, a part of local pyrexia of ceramic heater 1 circumferencial direction can be made, the heating time of lambda sensor 14 can be shortened by regulating the live width P of heating resistor 4.
As the basis material of above-mentioned ceramic heater 1, preferably constitute by various potteries such as aluminum oxide pottery, silicon nitride pottery, aluminium nitride matter potteries, preferred especially aluminium oxide ceramics for example preferably uses by Al
2O
388～95 weight %, SiO
22～7 weight %, CaO 0.5～3 weight %, MgO0.5～3 weight %, ZrO
2The aluminium oxide ceramics that 1～3 weight % constitutes.If Al
2O
3Content less than 88 weight %, then the nature of glass increases, so can increase the migration in when energising.On the other hand, if Al
2O
3Content surpasses 95 weight %, then can reduce the heating resistor 4 that is embedded in the ceramic heater 1, be spread in the amount of glass in the metal level, cause the durability of ceramic heater 1 to degenerate.
In addition, above-mentioned ceramic heater 1 for example is external diameter 2～20mm, the cylinder about long 200mm, and use ceramic heater 1 as the air-fuel ratio sensor heating of automobile, preferably its external diameter is 2～4mm, long 40～65mm.
In addition, when using with ceramic heater 1 as automobile, the preferred 3～15mm of heating length f of above-mentioned heating resistor 4.If this heating length f is shorter than 3mm, the intensification in the time of then can accelerating to switch on, but reduced the durability of ceramic heater 1.On the other hand, if be longer than 15mm, the programming rate that then slowed down is if will accelerate the power consumption that programming rate will increase ceramic heater 1.
And, above-mentioned heating length f be meant on the heating resistor 4, except the length of the round visuals of electrode lead-out part 5.
On the graphic length direction that is formed at the heating resistor 4 on the above-mentioned potsherd 3, the part that classifies in three categories, when the average of the live width of establishing heating resistor 4 central portion 4a is Ps, the average of the live width of its outside 4b is Po, then Ps＜Po.
In addition, can various selections be arranged to this length f that generates heat according to purposes.
In addition, on the inner peripheral surface of above-mentioned through hole 6, be formed with average thickness and be 20 μ m coating above and that constitute by refractory metal, the via conductors that filling is made of refractory metals such as scolders such as spelter solder, silver solder, gold-copper brazing alloy and tungsten, molybdenum, rheniums, and electrode pad 7 is housed is electrically connected with the electrode lead-out part 5 with heating resistor 4.
In addition, be contained in the electrode pad 7 on the above-mentioned through hole 6, its thickness is preferably 10～50 μ m, even long-time the use, the bond strength that is contained in the lead 8 on the electrode pad 7 also can be higher.
And, on above-mentioned electrode pad 7, form by Ni, Cr or be the coating that the composite material of main component constitutes with the thickness that is about 1～5 μ m, simultaneously, be situated between by scolder wire bonds 8 on this coating such as Au, Cu, Au-Cu, Au-Ni, Ag, Ag-Cu classes with these.
Above-mentioned scolder, as the Au-Cu scolder, preferably using Au content is the scolder of 25～95 weight %, as the Au-Ni scolder, preferred to use Au content be the scolder of 50～95 weight %, can be located at welding temperature about 1000 ℃, and can reduce residual stress after welding.In addition, when in the higher environment of humidity, using, use the scolder 11 of Au class, Cu class just more to be difficult to produce migration.In addition, if regulate environment for use humidity, prevent that scolder 11 surfaces from having water to generate and suppress migration, then also can use the Ag-Cu scolder as scolder.
By the lead 8 that above-mentioned scolder 11 engages, preferably use the Ni class, Fi-Ni class alloy of excellent heat resistance etc., the heat conduction of origin spontaneous heating resistance 4, deterioration can appear in the temperature of the lead 8 that can in use raise.
Particularly as the material of lead 8, when using Ni and Fe-Ni alloy, its average crystal grain diameter is preferably below the 400 μ m.If above-mentioned average crystal grain diameter surpasses 400 μ m, vibration and thermal cycle during then owing to use, near the lead 8 the welding position can produce fatigue, thereby crackle occurs, so conduct is preferred.
And for the average crystal grain diameter that makes above-mentioned lead 8 is little below 400 μ m, the temperature in the time of reducing welding as far as possible shortens the processing time.
Embodiment
Preparation with the aluminium oxide be main component and regulate silica, calcium oxide, magnesium oxide, the total body burden of zirconia at 10 weight % with interior potsherd 3, heating resistor 4 that constitutes by W-Re etc. at its surface printing and the electrode lead-out part 5 that constitutes by W etc.In addition, the pad 7 that prints electrode overleaf.
Setting heating length f is that 5mm comes and goes 4 times figure, and with the graphic width p of central portion 4a more carefully, 4b and the mode of graphic width p broadening is made heating resistor 4 toward the outer side.And, the graphic width p with respect to the central portion 4a of the graphic width p of outside 4b is adjusted to 60～100%.
In addition, the resistance value of adjusting heating resistor 4 is 2.4 Ω.
Then, form through hole 6, can make conducting between electrode pad 7 and the electrode lead-out part 5 by inside injection thickener at the end of the electrode lead-out part 5 that constitutes by W etc.The potsherd of preparing like this 3 is closely connected around ceramic core 2, and, become ceramic heater 1 at 1500～1600 ℃ of following sintering.
Make each 10 in the different sample of the design specification of graphic width p, these samples are arranged on the surface of lambda sensor 14, as shown in Figure 6, thermocouple 21 is set, estimate the time that this temperature reaches 300 ℃ on its surface.
In addition, provide the initial electric power that just can be warming up to 1100 ℃ in 1 minute, carry out ON, OFF circulation with room temperature to these samples.The period more than 110% that resistance change rate is reached the initial stage resistance value is charged in the table 1.
Table 1
| Sample No. | Graphic width | P1/Pn (％) | Reach 300 ℃ time (second) | Durability (period) | |||||
| P1 | P2 | P3 | P4 | P5 | P6 | ||||
| 1 * | 0.24 | 0.24 | 0.24 | 0.24 | 0.24 | 0.24 | 100 | 150 | 20000 |
| 2 | 0.24 | 0.24 | 0.24 | 0.24 | 0.24 | 0.26 | 92.3 | 85 | 19600 |
| 3 | 0.19 | 0.19 | 0.20 | 0.21 | 0.22 | 0.23 | 82.6 | 75 | 19000 |
| 4 | 0.19 | 0.20 | 0.21 | 0.22 | 0.23 | 0.24 | 79.2 | 70 | 18000 |
| 5 | 0.19 | 0.21 | 0.22 | 0.23 | 0.24 | 0.26 | 73.1 | 60 | 17000 |
| 6 | 0.19 | 0.22 | 0.24 | 0.26 | 0.26 | 0.32 | 59.4 | 50 | 14000 |
| 7 | 0.19 | 0.22 | 0.24 | 0.24 | 0.24 | 0.39 | 48.7 | 45 | 12000 |
| 8 | 0.24 | 0.24 | 0.24 | 0.24 | 0.24 | 0.38 | 63.2 | 62 | 18000 |
| 9 | 0.24 | 0.24 | 0.24 | 0.24 | 0.24 | 0.45 | 53.3 | 60 | 15000 |
| 10 | 0.24 | 0.24 | 0.24 | 0.24 | 0.24 | 0.50 | 48 | 58 | 11000 |
| 11 | 0.19 | 0.21 | 0.23 | 0.21 | 0.23 | 0.25 | 76 | 66 | 14000 |
*Outside characteristic range of the present utility model.
As shown in table 1, about the relation of the average Po of the live width of the average Ps of live width P1, the P2 of the central portion 4a of heating resistor 4 and two ends P3～P6, for the 2nd～11 of Ps＞Po all demonstrates good temperature-raising characteristic.
In addition, can confirm that the difference of the graphic width p of 4b is big more toward the outer side, the time of advent of heated object surface temperature is just short more.In addition, from this viewpoint of endurance quality of so-called ceramic heater 1, can also confirm on sample 1～6 and 8,9 it is resultful.
According to these results, to the thermal shock of ceramic heater 1 with to the heat efficiency of heated object, can confirmatory sample 2～6 and the figure of sample 8,9 scopes to regulate be effective.
In addition, as shown in table 2, in order to transmit heat to lambda sensor 14 effectively, can confirm the gap g of ceramic heater 1 and lambda sensor 14 inwall 14a, preferably below 0.5mm, further preferably below 200 μ m.
Table 2
| Sample No. | g(mm) | Reach 300 ℃ time (second) |
| 1 | 0 | 120 |
| 2 | 0.1 | 100 |
| 3 | 0.3 | 90 |
| 4 | 0.5 | 80 |
| 5 | 0.6 | 50 |
In addition, identical with embodiment 1, in order to confirm with slot part 9 is the shared length f of heating resistor 4 of benchmark, peripheral direction, makes sample, heating resistor 4 is configured in 15 °～345 °, 45 °～315 °, 90 °～270 °, 135 °～225 °, 150 °～210 ° the scope.With above-mentioned the same, on the surface of lambda sensor 14 thermocouple 21 is set, estimate 300 ℃ the time that reaches.
Table 3
| Sample No. | The allocation position of figure | Reach 300 ℃ time (second) |
| 1 | 15°～345° | 120 |
| 2 | 45°～315° | 100 |
| 3 | 90°～270° | 80 |
| 4 | 135°～225° | 60 |
| 5 | 150°～210° | 40 |
By the result as can be known, can confirm to shorten the time heated object surface, that reach target temperature by local configuration heating figure.
Claims (4)
1. ceramic heater is will to form heating resistor (4) on side's interarea and the interarea of the potsherd (3) that constitutes is closely connected on the outer peripheral face of ceramic core (2) and the one thermal sintering, it is characterized in that:
The structure that is formed on the heating resistor (4) on the potsherd (3) with the regulation shape is, the length of this heating resistor (4) is divided into three on central portion (4a) and both ends (4b), when the average live width that is made as (Ps), both ends (4b) in the average live width with the central portion (4a) of this heating resistor is made as (Po), Ps＜Po then.
2. ceramic heater according to claim 1, it is characterized in that: when the live width of the central portion (4a) that will be formed at the heating resistor (4) on the described potsherd (3) be made as (P1), will be toward the outer side the live width of (4b) be made as successively P2 ..., during Pn, then P1≤P2≤... ≤ Pn, and P1＜Pn.
3. ceramic heater according to claim 2 is characterized in that: the live width (P1) of described heating resistor (4) is 50～95% with respect to (Pn).
4. a lambda sensor is made of ceramic heater (1) and lambda sensor (14), it is characterized in that:
Described ceramic heater (1); To form heating resistor (4) and the interarea of the potsherd (3) that consists of is closely connected on the outer peripheral face of ceramic core (2) and the one thermal sintering at side's interarea; The structure that is formed on the heating resistor (4) on the potsherd (3) take the regulation shape as; The length of its heating resistor (4) is divided into three at central portion (4a) and both ends (4b); When the average live width that is made as (Ps), both ends (4b) in the average live width with the central portion (4a) of this heating resistor is made as (Po); Ps＜Po then
The maximum temperature portion of heating resistor formation portion is contacted with the inwall of lambda sensor (14) or is arranged on and approaches 0.5mm with interior scope.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004093889 | 2004-03-26 | ||
| JP2004093889A JP2004319459A (en) | 2003-03-27 | 2004-03-26 | Ceramic heating resistor and heater for oxygen probe using the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2731893Y true CN2731893Y (en) | 2005-10-05 |
Family
ID=35052205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2004200871663U Expired - Fee Related CN2731893Y (en) | 2004-03-26 | 2004-08-27 | Ceramic heater and oxygen probe using same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2731893Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102616036A (en) * | 2012-04-10 | 2012-08-01 | 无锡隆盛科技有限公司 | Manufacture method of heater capable of reducing light-off time of planar oxygen sensor |
| CN103546998A (en) * | 2013-10-24 | 2014-01-29 | 东莞市国研电热材料有限公司 | Large power ceramic heating unit |
| CN108781482A (en) * | 2016-03-16 | 2018-11-09 | 日本特殊陶业株式会社 | Ceramic heater |
-
2004
- 2004-08-27 CN CNU2004200871663U patent/CN2731893Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102616036A (en) * | 2012-04-10 | 2012-08-01 | 无锡隆盛科技有限公司 | Manufacture method of heater capable of reducing light-off time of planar oxygen sensor |
| CN102616036B (en) * | 2012-04-10 | 2013-12-25 | 无锡隆盛科技股份有限公司 | Manufacture method of heater capable of reducing light-off time of planar oxygen sensor |
| CN103546998A (en) * | 2013-10-24 | 2014-01-29 | 东莞市国研电热材料有限公司 | Large power ceramic heating unit |
| CN103546998B (en) * | 2013-10-24 | 2016-01-20 | 东莞市国研电热材料有限公司 | A kind of high-power ceramic heater |
| CN108781482A (en) * | 2016-03-16 | 2018-11-09 | 日本特殊陶业株式会社 | Ceramic heater |
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