CN203312623U - Spark plug composite alumina insulator - Google Patents
Spark plug composite alumina insulator Download PDFInfo
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- CN203312623U CN203312623U CN2012204577103U CN201220457710U CN203312623U CN 203312623 U CN203312623 U CN 203312623U CN 2012204577103 U CN2012204577103 U CN 2012204577103U CN 201220457710 U CN201220457710 U CN 201220457710U CN 203312623 U CN203312623 U CN 203312623U
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Abstract
The utility model discloses a spark plug composite alumina insulator. The spark plug insulator is divided into two parts: one is a spark plug ignition end insulator, and the other is a spark plug upper portion fire insulator. The spark plug ignition end insulator and the spark plug upper portion fire insulator are made of alumina ceramic materials which are prepared through different formulas respectively, wherein the spark plug ignition end insulator is made of high-performance alumina ceramics with small crystal grain size, high reaction activity and low Na2O content; the spark plug upper portion fire insulator is made of common alumina ceramics; the two different materials fill a die in proportion successively, are formed through isostatic pressing and then sintered so as to prepare the composite alumina insulator. The insulator is composed of two structures which are made of two different materials so that under the condition that the high performance requirement of a conventional spark plug is met, less expensive materials are consumed; compared to a conventional spark plug insulator that is wholly made of high-performance alumina ceramics, the cost of the composite alumina ceramic spark plug insulator is reduced by a decrease of over 50%.
Description
Technical field
The utility model relates to modular construction of a kind of spark plug and preparation method thereof, relates to specifically a kind of spark plug composite alumina insulator and manufacture method thereof; Described spark plug is by getting angry end use high-performance aluminium oxide ceramics at insulator, common aluminium oxide ceramics is used on insulator top, to improve spark plug performance, reduces production costs.
Background technology
The function of spark plug is the high voltage pulse discharge of electricity that high-voltage conducting wires is sent here, and air between disruptive spark plug two electrodes produces electric spark with the mist in this cylinder that ignites, and makes engine running.
Because internal combustion engine is fired the high-temperature firing gas (~ 2000-3000 ℃) that the chamber sparkover produces, spark plug insulator will be exposed in the hot atmosphere of about 500-700 ℃, and need bear the combustion gas outburst and produce strong mechanical pressure and high ignition voltage (20-50KV).In addition, the SO of fuel gas buring generation
2, NO
xDeng etchant gas, also will produce chemical corrosion to spark plug.Therefore, the insulator of spark plug all should possess good serviceability in room temperature and high temperature range thereof.
Aluminium oxide ceramics, because of its good thermal endurance, higher mechanical strength and insulation property and voltage-resistent characteristic etc., becomes the insulating material of spark plug manufacturing enterprise first-selection.The alumina base insulator is mainly by aluminium oxide (Al
2O
3) the component formation, usually can use a small amount of sintering aid such as silicon dioxide (SiO
2), calcium oxide (CaO) and magnesium oxide (MgO) etc. to be to reduce sintering temperature, improve sintering character.As the chief component of alumina base insulator, the performance of alumina source material itself has great influence to the spark plug insulator performance.
By Na composition in aluminium oxide, (change into Na
2O) different alumina source materials can be divided into low-soda alumina (Na
2O content is less than 0.1%, the quality percentage composition, lower with), middle soda aluminium oxide (Na
2O content is 0.1-0.2%) and normal soda alumina (Na
2O content is greater than 0.2%).Na
+Ion has very high ionic conduction performance, when it is present in the alumina base insulator in a large number, the characteristics such as insulation resistance, mechanical strength, proof voltage that will cause insulator under the high temperature more than 500 ℃ sharply descend, and affect the ignition performance of spark plug, even cause spark plug to lose efficacy.Therefore, in the production process of spark plug insulator, should use the aluminium oxide that the Na component content is lower as far as possible.But in the production process of alumina source material, the removal of Na composition will increase production cost, so low-soda alumina is more expensive.
Generally, the mechanical strength of spark plug insulator, voltage-resistent characteristics etc. improve along with the increase of alumina content in insulator, the quality of alumina percentage composition of introducing as United States Patent (USP) Μ S 2010/0229813 Al be 98.0% and the quality of alumina percentage composition introduced of Μ S 2011/0251042 Al be 99.0% alumina insulation body, its high-temperature machinery intensity is greater than 400MPa, dielectric breakdown voltage reaches 42KV/mm, all all to obviously be better than common aluminium oxide insulator (alumina content is less than 95.0% usually), but the increase of alumina content will make sintering aid content in insulator reduce, cause the sintering temperature of insulator to raise, energy consumption increases, cost rises.
In the production process of alumina insulation body, the former crystal grain footpath of alumina source material has important influence to the final performance of insulator.Use the little alumina source material in former crystal grain footpath, as the submicron order aluminium oxide, reactivity is high, can reduce sintering temperature, and can suppress too growing up of crystal grain in insulator, is conducive to improve mechanical strength, voltage-resistent characteristic of spark plug insulator etc.But same, the little alumina source material production cost in former crystal grain footpath is higher, and price is more expensive.
In recent years, in order to meet the requirements such as energy-saving and environmental protection, safety, the internal-combustion engine technology especially development of vehicle gasoline engine is very rapid.Engine design is tending towards compact, slimline, lightweight, when guaranteeing enough power performance, improves the economy of engine fuel, reduces engine consumption.The use of supercharging technology, comprise turbocharging technology and engine driven supercharging technology, can effectively promote the power per liter of engine, and especially twin turbocharged technology has improved power, the moment of torsion of engine greatly.It is even higher that this also makes the compression ratio of automobile engine be promoted to 14:1 from traditional 8.5:1, adds pressure ratio (be generally and be less than 3), and automobile engine compression end of a period pressure is promoted to present 20 ~ 40bar left and right from 8 ~ 10 bar in past.In addition, also have the use such as variable air inlet technology, in-cylinder direct-jet technology GDI, changeable compression ratio technique, cylinder stopping technique, all make the spark plug condition of work become harsher, also the serviceability of spark plug and insulator thereof is had higher requirement.Therefore, use former crystal grain footpath is little, reactivity is high, Na
2The aluminium oxide that O content is low becomes manufacturing enterprise's inevitable choice gradually with preparation high-performance spark plug, but this can cause the sharply rising of production cost; The performance index of automobile engine and spark plug is to such as table one.
The performance index contrast of table one automobile engine and spark plug
The spark plug insulator performance index
Practice shows, spark plug in use, only has the ignition end of spark plug insulator to be exposed in the combustion nozzle chamber, need bear high temperature, high pressure, high-tension percussion, and thinner thickness own, easily cause the phenomenons such as this position insulator scaling loss, spark-over, cause spark plug to lose efficacy.Simultaneously, also only have the ignition end of spark plug insulator, to high-temperature insulation resistance, higher requirement is arranged.And spark plug insulator top thickness is thicker, lower to this position insulator performance requirement.Therefore, footpath is little, reactivity is high, Na if former crystal grain is all used in the production of spark plug insulator
2The high-performance aluminium oxide that O content is low, not only can make production cost sharply rise, and also can cause the function surplus simultaneously.
By the domestic Searches of Patent Literature, find that there is the patent about spark plug alumina insulation body and preparation method thereof aspect, mainly contain following:
1, the patent No. is CN99800197.X, the utility model name is called the utility model patent of " spark plug, for the alumina base insulator of spark plug and for the production method of this insulator ", this patent discloses a kind of spark plug, for the alumina base insulator of spark plug and for the production method of this insulator, the technical scheme that proposes is in comprising the insulator of aluminium oxide as main component, using the Na composition in insulator as Na
2O is arranged in 0.07 to 0.5wt% scope.Although the Na component content is high to think and exceeded general knowledge routinely always, but with regard to the Na component content of this scope, insulation resistance at high temperature, mechanical strength etc. do not have unexpected decline, and can obtain the insulator that performance can be compared with the insulator of being made by the Na component content conventional low-soda alumina lower than above-mentioned scope.As a result, can use cost than the much lower middle soda aluminium oxide of the conventional low-soda alumina used and normal soda alumina, replace low-soda alumina, thereby realize the insulator 2 of spark plug 100 and also have the production cost of spark plug 100 significantly to reduce.
2, the patent No. is CN200980122464.7, the utility model name is called the utility model patent of " ceramic spark plug insulator and manufacture method thereof ", this patent discloses a kind of insulator for spark ignition device, comprise: electric insulation ceramics core pipe, the endoporus that it has terminals, firing tip and extends along the longitudinal hole axle from described terminals to described firing tip; And electric insulation ceramics core head tube, it has the second outer surface and the second hole, and the second outer surface of described ceramic core head tube engages and directly bonds with the described hole near described firing tip of described ceramic core tubes is nested.This insulator also comprises the similarly shoulder pipe of the nested and direct bonding on the outer surface of ceramic core tubes, or the rod tube of the nested and direct bonding on the outer surface of ceramic core tubes.This pottery can comprise alumina-based ceramic, and other suitable ceramic materials, and this pipe can be by identical or different ceramic composition manufacture.The utility model also comprises by during sintering, controlling shrinkage manufactures this nested pipe, directly the method for the insulator of bonding.
3, the patent No. is CN201080029677.8, and the utility model name is called the utility model patent of " spark plug ", and this patent discloses a kind of spark plug with excellent at high temperature voltage-resistent characteristic.Described spark plug is equipped with central electrode, insulator and metal-back, it is characterized in that: described insulator comprises the alumina base sintered body, described alumina base sintered body comprises silicon components (Si component), magnesium component (Mg component), be selected from least a component of calcium component, strontium component and barium component, and rare earth element component (RE component); The Grain-Boundary Phase of described alumina base sintered body has the six side's aluminate crystals that comprise described RE component; In described alumina base sintered body, the weight ratio of described RE component and described Mg component meets 5.4≤(RE oxide)/MgO≤17.5; Being arranged in described crystalline phase and having six side's aluminate crystals or have the diameter of six side's aluminate crystals and Si component with TEM, be the circular light spot of 0.3nm, the content of alkaline components is scaled the 0.01-20 % by weight with oxide.
4, the patent No. is CN201080029969.1, the utility model name is called the utility model patent of " manufacture method of spark plug and spark plug ", this patent discloses a kind of spark plug, and it has realized high withstand voltage characteristic at high temperature, and voltage-resistent characteristic at high temperature is not easy to reduce.Spark plug of the present utility model is characterised in that, it comprises: central electrode, insulator and main body accessory, described insulator possesses the silicon of containing composition, the 2nd family's elemental composition, alumina base sintered body with rare earth elements, as the result of utilizing X-ray diffraction to analyze, described alumina base sintered body is formed mutually by glassy phase and alumina crystal, with transmission electron microscope, observe the Grain-Boundary Phase of described alumina base sintered body, in the circular light spot of 30 diameter 0.3nm, calculate take weight ratio [alkali metal/rare earth element] that oxide converts of alkali metal component and above-mentioned rare earth elements and the mean value of acquisition is 0.01 ~ 1.0.
Although above-mentioned patent all relates to spark plug alumina insulation body and preparation method thereof, but carefully analyze, can find out, these patents are all still the improvement of doing around spark plug alumina insulation body formula mostly, only having the patent No. is the structure that the utility model patent of CN200980122464.7 relates to insulator, but described structure still just on common structure emphasis moulding technique is improved, so existing technology is all to according to the now requirement of spark plug, former crystal grain footpath is little, reactivity is high, Na using
2The low aluminium oxide of O content causes the problem sharply risen of production cost to solve with preparation high-performance spark plug, therefore necessary to this further Improvement in addition.
The utility model content
The purpose of this utility model is that the contradiction between above spark plug alumina insulation body performance and cost, provide a kind of compound alumina ceramic spark plug insulator, reduces production costs when improving the spark plug serviceability.
The implementer's case proposed according to utility model purpose of the present utility model is: a kind of compound alumina ceramic spark plug insulator, spark plug insulator is divided into to two parts, a part is got angry and is held insulator for spark plug, and another part is spark plug upper portion insulating body; Spark plug is got angry and is held insulator and spark plug upper portion insulating body to adopt respectively the alumina ceramic material of different formulations to make; Wherein, spark plug ignition end insulator is little by the crystal grain footpath, reactivity is high, Na
2The high-performance aluminium oxide ceramics that O content is low is made, and spark plug upper portion insulating body is by common aluminium oxide ceramic making; Two kinds of different materials successively are filled in mould in proportion, by sintering, make the composite alumina insulator after waiting static pressure compressing.
Further, to be divided into two parts be according to spark plug, to get angry other any ratios that the ratio of end insulator and spark plug upper portion insulating body 1:2-9 maybe can meet spark plug performance at cutting apart to described spark plug insulator.
Further, the quality percentage composition of the high-performance aluminium oxide ceramics aluminium oxide of described spark plug ignition end insulator is 95.0% ~ 99.9%, and all the other compositions are the normal sintering auxiliary agent, use Na
2The low-soda alumina raw material that O quality percentage composition is less than 0.1%, the former crystal grain footpath of alumina source material is less than 1.50 μ m.Press traditional processing technology, by alumina source material with sintering aid, mix, ball milling, slurrying, that spray drying granulation makes powder is stand-by.
Further, the alumina source material of described spark plug ignition end insulator is used former crystal grain footpath to be about 1 μ m, Na
2O quality percentage composition is the oxide of high activity aluminium of 0.01-0.1%.
Further, the alumina content of described spark plug upper portion insulating body is about 85.0-95.0%, uses Na
2Middle soda or normal soda alumina raw material that O content is greater than 0.1%, the former crystal grain footpath of alumina source material is about 3 μ m.By above-mentioned identical production technology, make spray drying powder stand-by.
The utility model has the advantage of, the utility model is by adopting the insulator of two kinds of different materials structures, under the prerequisite that meets present spark plug high performance requirements, reduced the consumption of expensive material, compare spark plug insulator and all use the high-performance aluminium oxide ceramics, compound alumina ceramic spark plug insulator cost will descend more than 50%.
After by scanning electron microscopy, showing sintering, the spark plug ignition holds the size of insulator oxide aluminium ceramic crystalline grain to be about 2-3 μ m, at the temperature of 500 ℃, the high-temperature insulation resistance of spark plug is greater than 1000M Ω, at the temperature of 900 ℃, the mechanical strength of spark plug insulator reaches 420 MPa, and the dielectric breakdown voltage of spark plug insulator reaches 42KV/mm; The performance of spark plug upper portion insulating body is still suitable with present common spark plug performance.
The accompanying drawing explanation
Fig. 1 be spark plug configuration partly cut open front view; .
Fig. 2 be composite alumina based insulation body structure partly cut open front view;
Fig. 3 is the compressing schematic diagram of spark plug composite alumina based insulation chaeta base;
Fig. 4 is the complete section front view of two kinds of formula materials different proportions of an embodiment of the utility model;
Fig. 5 is the complete section front view of two kinds of formula materials different proportions of another embodiment of the utility model;
Fig. 6 is the complete section front view of two kinds of formula materials different proportions of another embodiment of the utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further described.
By accompanying drawing, can find out, the utility model relates to a kind of compound alumina ceramic spark plug insulator, and spark plug insulator is divided into to two parts, and a part is got angry and held insulator for spark plug, and another part is spark plug upper portion insulating body; Spark plug is got angry and is held insulator and spark plug upper portion insulating body to adopt respectively the alumina ceramic material of different formulations to make; Wherein, spark plug ignition end insulator is little by the crystal grain footpath, reactivity is high, Na
2The high-performance aluminium oxide ceramics that O content is low is made, and spark plug upper portion insulating body is by common aluminium oxide ceramic making; Two kinds of different materials successively are filled in mould in proportion, by sintering, make the composite alumina insulator after waiting static pressure compressing.
Further, to be divided into two parts be according to spark plug, to get angry other any ratios that the ratio of end insulator and spark plug upper portion insulating body 1:2-9 maybe can meet spark plug performance at cutting apart to described spark plug insulator.
Further, the quality percentage composition of the high-performance aluminium oxide ceramics aluminium oxide of described spark plug ignition end insulator is 95.0% ~ 99.9%, and all the other compositions are the normal sintering auxiliary agent, use Na
2The low-soda alumina raw material that O content is less than 0.1%, the former crystal grain footpath of alumina source material is less than 1.50 μ m.Press traditional processing technology, by alumina source material with sintering aid, mix, ball milling, slurrying, that spray drying granulation makes powder is stand-by.
Further, the alumina source material of described spark plug ignition end insulator is used former crystal grain footpath to be about 1 μ m, Na
2The oxide of high activity aluminium of O content 0.01-0.1%.
Further, the alumina content of described spark plug upper portion insulating body is about 85.0-95.0%, uses Na
2Middle soda or normal soda alumina raw material that O content is greater than 0.1%, the former crystal grain footpath of alumina source material is about 3 μ m.By above-mentioned identical production technology, make spray drying powder stand-by.
Be described below by reference to the accompanying drawings:
Accompanying drawing 2 has provided a kind of structural representation that alumina base insulator of the present utility model is the aluminium base pottery of combined oxidation: can find out from accompanying drawing, spark plug insulator 2 is divided into to two parts, a part is got angry and is held insulator 6 for spark plug, and a part is spark plug upper portion insulating body 7; Wherein, spark plug is got angry and is held insulator 6 to use the high-performance aluminium oxide ceramics, and spark plug upper portion insulating body 7 is used common aluminium oxide ceramics.
The quality percentage composition of the high-performance aluminium oxide ceramics aluminium oxide of spark plug ignition end insulator is 95.0% ~ 99.9%, and all the other compositions are sintering aid, and alumina source material is used former crystal grain footpath to be about 1 μ m, Na
2O content is 0.01% oxide of high activity aluminium.
The increase of quality of alumina percentage composition in spark plug insulator, be conducive to improve the characteristics such as the high-temperature machinery intensity of alumina base insulator and proof voltage, it is 99.0% that the utility model is got angry the quality percentage composition optimum value of aluminium oxide in end insulator high-performance aluminium oxide ceramics.
The former crystal grain of alumina source material footpath is tiny, and the aluminium oxide ceramics crystal grain obtained is little, compact structure, and Na in raw material
2The low raising that is conducive to spark plug insulator high-temperature insulation resistance and voltage-resistent characteristic of O content.
The concrete manufacturing step of aluminium oxide ceramics is as follows: by a certain proportion of alumina source material with sintering aid, mix, ball milling is to certain particle diameter (D
50); Add a small amount of dispersant, binding agent and lubricant to make slurry, spray-dried granulation makes mobility, and powder is stand-by preferably.
Spark plug upper portion insulating body is used common aluminium oxide ceramics, and the quality percentage composition of aluminium oxide is 85.0% ~ 95.0%, and all the other compositions are the normal sintering auxiliary agent.Alumina source material is used former crystal grain footpath to be about 3 μ m, Na
2Middle soda or normal soda alumina raw material that O content is greater than 0.1%.
The common aluminium oxide ceramics of spark plug upper portion insulating body, used former crystal grain footpath to be about the common aluminium oxide of 3 μ m, compares fine grain alumina source material, and sintering temperature requires higher; And the quality percentage composition of aluminium oxide in the reduction insulator, the content that increases sintering aid can reduce the sintering temperature of ceramics insulator.In the common aluminium oxide ceramics in the utility model insulator top, the quality percentage composition of aluminium oxide is 95.0%.
The common aluminium oxide ceramics of spark plug upper portion insulating body is used Na
2The large common alumina source material in high, the former crystal grain of O content footpath will make production cost sharply descend, and increase economic efficiency.
According to above-mentioned identical technique, stand-by by after alumina source material and sintering aid mixing, making the spray drying granulation powder.
Accompanying drawing 3 has provided a kind of processing mode of the present utility model, and spark plug composite alumina insulator makes by following steps: the high-performance aluminium oxide ceramics powder that will make and common aluminium oxide ceramic powder are respectively charged in funnel 1 and funnel 29.During blanking, the first next part powder of funnel 1, as account for the high-performance aluminium oxide ceramics powder 14 of blank cumulative volume 10%-30%, then funnel 29 blankings to isostatic tooling 13 is filled completely, as accounts for the common aluminium oxide ceramic powder 15 of blank cumulative volume 70%-90%.Powder packed is complete, suppresses under the static pressure such as high pressure of 150-200MPa, is ground to the insulator blank of regulation shape, and sintering makes the composite alumina insulator in kiln.
Accurate for what guarantee to prepare burden, in funnel 1 and funnel 29 blanking channels, respectively feeder 10 and 11 can be set; Funnel 1 and funnel 29 blanking channels are pooled in funnel 12, then inject isostatic tooling 13 by isostatic mold filling tube 16.
Certainly, when the moulding of spark plug insulator blank, also can first the above-mentioned common aluminium oxide ceramic powder of part be filled in isostatic tooling, be used for forming the spark plug insulator superstructure, again by part high-performance aluminium oxide ceramics powder packed in isostatic tooling, be used for forming spark plug insulator and get angry end structure.The compacting simultaneously of two kinds of formula aluminium oxide ceramics powders, grinding, sintering make the composite alumina spark plug insulator.
The utility model composite alumina insulator, the sintering shrinkage of insulator ignition end high-performance aluminium oxide ceramics is 1.195 ~ 1.205, the sintering shrinkage of the common aluminium oxide ceramics in insulator top is 1.190 ~ 1.195, therefore in the junction on composite alumina based insulation body ignition end and top, do not have stress to produce, two kinds of formula aluminium oxide ceramics are in conjunction with densification.
After sintering, the high-performance aluminium oxide ceramics crystal grain of insulator ignition end is less, and average grain diameter is 2 ~ 3 μ m left and right, and the common aluminium oxide ceramic alumina crystal grain on insulator top is larger, and average grain diameter reaches 5 ~ 6 μ m left and right.
In the utility model, the bulk density of high-performance aluminium oxide ceramics reaches 3.925g/cm
3, be better than bulk density 3.750 g/cm of common aluminium oxide ceramics
3Under 500 ℃ of high temperature, the high-temperature insulation resistance of high-performance aluminium oxide ceramics is greater than 1000M Ω, is better than the shunt resistance 500M Ω of common aluminium oxide ceramics; Under the high temperature of 900 ℃, the mechanical strength of high-performance aluminium oxide ceramics reaches 420 MPa, is better than mechanical strength 350 MPa of common aluminium oxide ceramics; The dielectric breakdown voltage of high-performance aluminium oxide ceramics reaches 42KV/mm, is better than the dielectric breakdown voltage 35KV/mm of common aluminium oxide ceramics.Hence one can see that, and the performance of high-performance aluminium oxide ceramics obviously is better than common aluminium oxide ceramics.
In the utility model, spark plug alumina insulation body is comprised of two kinds of formula aluminium oxide ceramics: the end insulator high-performance aluminium oxide ceramics of getting angry is used Na
2The oxide of high activity aluminium raw material that low, the former crystal grain of O content footpath is little, superior performance; The common aluminium oxide ceramics of upper portion insulating body is used Na
2The common alumina source material that high, the former crystal grain of O content footpath is large, cheap.Therefore, composite alumina insulator of the present utility model can reduce production cost when improving the spark plug insulator performance, have very high using value.In the utility model, Na
2The little raw-material market price of oxide of high activity aluminium in low, the former crystal grain of O content footpath is raw-material 6 times of common aluminium oxide, if in the composite alumina insulator, high-performance ceramic aluminium oxide and conventional ceramic aluminium oxide proportion are respectively 30% and 70%, compare the alumina base insulator of only using a kind of formula of high-performance ceramic aluminium oxide, composite alumina based insulation body is guaranteeing under the prerequisite of properties of product cost-savedly 58.3%, has good economic worth.
Embodiment mono-
A kind of spark plug insulator as shown in Figure 4, is characterized in that spark plug insulator is comprised of compound alumina ceramic: insulator is got angry at holding and is comprised of the high-performance aluminium oxide ceramics, and insulator top is comprised of common aluminium oxide pottery.Insulator is got angry and is held the high-performance aluminium oxide ceramics to use Na
2The oxide of high activity aluminium raw material that low, the former crystal grain of O content footpath is little, the quality percentage composition of aluminium oxide is 99.0%, all the other compositions are sintering aid.The common aluminium oxide ceramics in insulator top is used former crystal grain footpath to be about 3 μ m, Na
2Middle soda or normal soda alumina raw material that O content is greater than 0.1%, the quality percentage composition of aluminium oxide is 95.0%, all the other compositions are sintering aid.
Spark plug composite alumina insulator of the present utility model comprises the following steps: the high-performance aluminium oxide ceramics powder that will make and common aluminium oxide ceramic powder are respectively charged in funnel one and funnel two; During blanking, the first next part powder of funnel one feeder, as account for the high-performance aluminium oxide ceramics powder of blank cumulative volume 10%, then funnel two feeder blankings to isostatic tooling is filled completely, as accounts for the common aluminium oxide ceramic powder of blank cumulative volume 90%.Powder packed is complete, suppresses under the static pressure such as high pressure of 150-200MPa, is ground to the insulator blank of regulation shape, and sintering makes composite alumina based insulation body in kiln.
Spark plug composite alumina insulator of the present utility model, at the temperature of 500 ℃, the high-temperature insulation resistance of spark plug is greater than 1000M Ω, at the temperature of 900 ℃, the mechanical strength of spark plug insulator reaches 420 MPa, and the dielectric breakdown voltage of spark plug insulator reaches 42KV/mm.Compare spark plug insulator and all use the high-performance aluminium oxide ceramics, compound alumina ceramic spark plug insulator cost-saved 75%.
Embodiment bis-
A kind of spark plug insulator as shown in Figure 5, is characterized in that spark plug insulator is comprised of the compound alumina ceramic fire: insulator is got angry at holding and is comprised of the high-performance aluminium oxide ceramics, and insulator top is comprised of common aluminium oxide pottery.Insulator is got angry and is held the high-performance aluminium oxide ceramics to use Na
2The oxide of high activity aluminium raw material that low, the former crystal grain of O content footpath is little, the quality percentage composition of aluminium oxide is 98.0%, all the other are the normal sintering auxiliary agent.The common aluminium oxide ceramics in insulator top is used former crystal grain footpath to be about 3 μ m, Na
2Middle soda or normal soda alumina raw material that O content is greater than 0.1%, the quality percentage composition of aluminium oxide is 93.0%, all the other compositions are sintering aid.
Spark plug composite alumina insulator of the present utility model comprises the following steps: the high-performance aluminium oxide ceramics powder that will make and common aluminium oxide ceramic powder are respectively charged in funnel one and funnel two; During blanking, the first next part powder of funnel one feeder, as account for the high-performance aluminium oxide ceramics powder of blank cumulative volume 20%, then funnel two feeder blankings to isostatic tooling is filled completely, as accounts for the common aluminium oxide ceramic powder of blank cumulative volume 80%.Powder packed is complete, suppresses under the static pressure such as high pressure of 150-200MPa, is ground to the insulator blank of regulation shape, and sintering makes composite alumina based insulation body in kiln.
Spark plug composite alumina insulator of the present utility model, at the temperature of 500 ℃, the high-temperature insulation resistance of spark plug is greater than 1000M Ω, at the temperature of 900 ℃, the mechanical strength of spark plug insulator reaches 420 MPa, and the dielectric breakdown voltage of spark plug insulator reaches 42KV/mm.Compare spark plug insulator and all use the high-performance aluminium oxide ceramics, compound alumina ceramic spark plug insulator cost-saved 66.7%.
Embodiment tri-
A kind of spark plug insulator as shown in Figure 6, is characterized in that spark plug insulator is comprised of the compound alumina ceramic fire: insulator is got angry at holding and is comprised of the high-performance aluminium oxide ceramics, and insulator top is comprised of common aluminium oxide pottery.Insulator is got angry and is held the high-performance aluminium oxide ceramics to use Na
2The oxide of high activity aluminium raw material that low, the former crystal grain of O content footpath is little, the quality percentage composition of aluminium oxide is 97.0%, all the other compositions are sintering aid.The common aluminium oxide ceramics in insulator top is used former crystal grain footpath to be about 3 μ m, Na
2Middle soda or normal soda alumina raw material that O content is greater than 0.1%, the quality percentage composition of aluminium oxide is 90.0%, all the other compositions are sintering aid.
Spark plug composite alumina insulator of the present utility model comprises the following steps: the high-performance aluminium oxide ceramics powder that will make and common aluminium oxide ceramic powder are respectively charged in funnel one and funnel two; During blanking, the first next part powder of funnel one feeder, as account for the high-performance aluminium oxide ceramics powder of blank cumulative volume 30%, then funnel two feeder blankings to isostatic tooling is filled completely, as accounts for the common aluminium oxide ceramic powder of blank cumulative volume 70%.Powder packed is complete, suppresses under the static pressure such as high pressure of 150-200MPa, is ground to the insulator blank of regulation shape, and sintering makes the composite alumina insulator in kiln.
Spark plug composite alumina insulator of the present utility model, at the temperature of 500 ℃, the high-temperature insulation resistance of spark plug is greater than 1000M Ω, at the temperature of 900 ℃, the mechanical strength of spark plug insulator reaches 420 MPa, and the dielectric breakdown voltage of spark plug insulator reaches 42KV/mm.Compare spark plug insulator and all use the high-performance aluminium oxide ceramics, compound alumina ceramic spark plug insulator cost-saved 58.3%.
Claims (1)
1. a spark plug composite alumina insulator, is characterized in that, spark plug insulator (2) is divided into to two parts, and a part is got angry and held insulator (6) for spark plug, and a part is spark plug upper portion insulating body (7); Wherein, spark plug ignition end insulator (6) is the high-performance aluminium oxide ceramics, and spark plug upper portion insulating body (7) is common aluminium oxide ceramics; It is to get angry and hold the ratio of insulator and spark plug upper portion insulating body 1:2-9 to cut apart according to spark plug that described spark plug insulator is divided into two parts.
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| CN2012204577103U CN203312623U (en) | 2012-09-10 | 2012-09-10 | Spark plug composite alumina insulator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242068A (en) * | 2014-08-25 | 2014-12-24 | 长兴威力窑业有限公司 | Sintering process for automobile ceramic sparking plug |
| CN107851972A (en) * | 2015-07-17 | 2018-03-27 | 株式会社电装 | The manufacture method of spark plug insulator |
| US11870221B2 (en) | 2021-09-30 | 2024-01-09 | Federal-Mogul Ignition Llc | Spark plug and methods of manufacturing same |
-
2012
- 2012-09-10 CN CN2012204577103U patent/CN203312623U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242068A (en) * | 2014-08-25 | 2014-12-24 | 长兴威力窑业有限公司 | Sintering process for automobile ceramic sparking plug |
| CN107851972A (en) * | 2015-07-17 | 2018-03-27 | 株式会社电装 | The manufacture method of spark plug insulator |
| US11870221B2 (en) | 2021-09-30 | 2024-01-09 | Federal-Mogul Ignition Llc | Spark plug and methods of manufacturing same |
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Assignee: ZHUZHOU TORCH MECHANICAL MANUFACTURING Co.,Ltd. Assignor: ZHUZHOU TORCH SPARKPLUG Co.,Ltd. Contract record no.: 2014430000084 Denomination of utility model: Spark plug composite alumina insulator Granted publication date: 20131127 License type: Exclusive License Record date: 20140528 |
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