CN101643356A - Injection molding process of alumina ceramics for spark plugs - Google Patents
Injection molding process of alumina ceramics for spark plugs Download PDFInfo
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- CN101643356A CN101643356A CN200910044200A CN200910044200A CN101643356A CN 101643356 A CN101643356 A CN 101643356A CN 200910044200 A CN200910044200 A CN 200910044200A CN 200910044200 A CN200910044200 A CN 200910044200A CN 101643356 A CN101643356 A CN 101643356A
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Abstract
The invention discloses an injection molding process of alumina ceramics for spark plugs, which comprises the steps of proportioning, mixing materials, granulating, injection molding, degreasing, biscuit firing and high-temperature sintering. By improving the traditional injection molding technique, the process utilizes high-purity alumina powder as the raw material, optimizes molding parameters,such as injection temperature, injection pressure, pressure maintaining time and the like, and also uses the advanced low-temperature degreasing technique so as to prepare the alumina ceramics which are 99.9% transparent. The process has the advantages of high mechanization degree and automation degree; the molded ceramic products have very high dimensional precision and surface smoothness; and the sintered ceramic products do not require machining so as to obviously reduce the processing cost of ceramics.
Description
Technical field
The present invention pottery component manufacturing technology field is specifically related to a kind of injection molding technique of alumina ceramics for spark plugs.
Background technology
Sparking plug is the starter gear on some industrial equipmentss and the motor car engine, and its core component-alumina-ceramic plays a part insulation and high pressure resistant electric arc.Traditional alumina ceramics for spark plugs all adopts equal pressing forming technology to be prepared.It is not high to adopt this technology to prepare the alumina ceramic product density, and product performance are difficult to and external like product competition.
(Ceramics Injection Molding CIM) is development and come on the basis of polymer injection forming technique comparative maturity to the ceramic injection forming technology.Its outstanding advantage comprises: 1) moulding process mechanize and level of automation height; 2) can be only the ceramic component of the nearly various complicated shapes of moulding, make the ceramic product behind the sintering need not to carry out machining or few processing, thereby reduce expensive ceramic tooling cost; 3) ceramic product that molds has high dimensional precision and surface smoothness.Therefore, ceramic injection forming becomes one of high precision and high-efficient molding method in the existing forming process of ceramics technology.
The preparation technology of ceramic injection forming comprises the following aspects: at first being the feeding preparation, is with sintered ceramic powder and suitable organic carrier stirring and evenly mixing, granulation at a certain temperature according to a certain ratio; Carry out injection molding then, promptly under certain temperature and pressure, material is injected at a high speed in the mould, reach the intact mold filling and the demoulding; Carry out degreasing subsequently, promptly by heating or other physico-chemical process the intravital organism of moulding is got rid of, the base substrate after the degreasing is densification sintering at high temperature.
Wherein: the injection molding step is the core procedure of whole operation, as controls improper meeting and make product have a lot of defectives, separates as crackle, hole, weld seam, layering, powder and binding agent etc.Therefore, molding parameters such as control and optimization injection temperature, injection pressure, inject time, dwell time prevent to inject the separation and the segregation of each component in the material to reducing the fluctuation of green compact weight, and the utilization ratio that improves finished product rate and material is most important.Degreasing is meant by heating and other physico-chemical process to be got rid of the intravital organism of moulding and produces the process of a small amount of presintering.It is the most difficult and most important factor in the injection molding, and other similar techniques all is limited by this link both at home and abroad.
Summary of the invention
The object of the present invention is to provide a kind of injection molding technique of high-performance alumina ceramics for spark plugs.
Principle of the present invention is: injection process can be divided into injection stage and packing stage, injection stage be advance melt to begin to be full of die cavity from screw rod to melt till.At this moment, the speed (being injection speed) of pressure that melt is set at screw head (being injection pressure) and screw rod propelling melt is injection molding key parameter.At injection stage, must set up enough speed and pressure and can guarantee that just melt is full of die cavity.Can cause the cavity pressure deficiency if injection pressure regulates to hang down, melt can not be full of die cavity; Otherwise,, then can cause the goods bad phenomenon such as limit, the mould that expands of overflowing if adjust too highly.Packing stage be full of die cavity and begin to freeze envelope from melt to cast gate till.After injection stage is finished, must continue to keep injection pressure, the external contracting of keeping melt flows, and lasts till that always cast gate freezes till the envelope.Therefore packing stage is under the effect of dwell pressure, and the melt in the die cavity will obtain cooling off feeding and further compression and density, if the dwell pressure deficiency then can cause cavity pressure low excessively.Dwell time can influence the refluence of melt, and the dwell time, short more then cavity pressure reduced soon more, finally made cavity pressure low more.Therefore, we explore best injecting molding machine through repetition test.
The injection molding technique of alumina ceramics for spark plugs of the present invention may further comprise the steps:
(1) batching: earlier shaping assistant paraffin and a spot of oleic acid are added the material machine that closes, be heated to 60-120 ℃, treat that paraffin and oleic acid melt the back fully and adds the high purity aluminium oxide powder, described paraffin add-on is the 10-20% of aluminum oxide powder weight, and described oleic acid add-on is the 1-5% of aluminum oxide powder weight;
(2) spice: each material that proportioning is good is closing mixing under the material machine Dare mechanical agitation, and mixture temperature is higher than 60 ℃, prevents to bring into various impurity in the batch mixing process;
(3) granulation: the ceramic size of mixing is added tablets press, but utilize the extrusion screw rod of tablets press that slurry is extruded the plasticine bar, but with cutting unit the plasticine bar is divided into small-particle again, described low particle size is: diameter 1-2mm, and length is 2-4mm;
(4) injection molding: the feeding mouth that particulate material is added to injection moulding machine, under the drive of injector screw rod, enter in the injecting cavity, control certain processing condition, the effect of extruding by the injector screw rod is pressed into ceramic size in the mould, and the injection technique condition is: injection temperature is 70-120 ℃, injection pressure is 10-100KPa, be 8-12s inject time, and screw rod fall time is 8-12s, and dwell pressure is 25KPa, dwell time is 4-6s, and be 8-12s cooling time;
(5) take off ester: adopt low temperature to take off the ester technology, take off 100-200 ℃ of ester temperature, taking off the ester time is 20-50 hour;
(6) biscuiting: the biscuiting temperature is 1100-1300 ℃, is incubated 1-3 hour;
(7) high temperature sintering: 1600-1900 ℃ of following high temperature sintering time is 2 hours.
The injection technique condition optimization is in described (4) step: injection temperature is 70-100 ℃, and injection pressure is 40-60KPa, and be 10s inject time, and screw rod fall time is 10s, and dwell pressure is 25KPa, and the dwell time is 5s, and be 10s cooling time.
Take off the ester temperature in described (5) step and be preferably 150 ℃, take off the ester time to be preferably 22-32 hour.
The invention has the advantages that:
1, by traditional injection molding technology is improved, with the high purity aluminium oxide powder as raw material, molding parameters such as injection temperature, injection pressure, inject time, dwell time are optimized, prepare high performance automobile spark plug alumina-ceramic, the ceramic product that molds has high dimensional precision and surface smoothness;
2, the present invention has adopted advanced low temperature to take off the ester technology, take off ester after product do not have defective, and low temperature takes off ester and has significantly reduced production cost.
Embodiment
Following examples are intended to illustrate the present invention rather than limitation of the invention further, and the present invention can implement by the described arbitrary mode of summary of the invention.
Embodiment 1:
1, raw material
Alumina-ceramic powder (Al
2O
3, 99.9%), paraffin (PW, chemical pure), oleic acid (OA, chemical pure).
2, experimentation
Load weighted whiteruss 1.2kg and oleic acid 0.2kg are heated to about 100 ℃ simultaneously, it is melted fully until being the settled solution shape.Slowly join above-mentioned dissolving in the material with 99.9% alumina-ceramic powder 10kg is disposable, stir with stirrer, after treating thorough mixing, with compound granulation in forcing machine. compound is made and is about 2-4mm the most at last, and the strip of the about 1-2mm of diameter obtains being fit to injection molding particulate materials. and injection molding is finished on the Xiang SA type injection moulding machine in the sea everyday, the control injecting condition is: 90 ℃ of injection temperatures, injection pressure 80KPa, inject time 10s, screw rod 10s fall time; Dwell pressure is 25KPa, and the dwell time is 5s, and be 10s cooling time.
Sample is carried out degreasing, take off the ester temperature about 170 ℃, take off the ester time about 24 hours; With the degreasing base 1220 ℃ of biscuitings 1.5 hours; Place in the high-temperature hydrogen sintering oven 1880 ℃ keep 2 hours sintering finished.
It is as follows with the transparent alumina performance to adopt injection molding technique of the present invention to make sparking plug:
| Performance index | Injection molding technique of the present invention |
| Disruptive strength (kV/mm) | ??50KV |
| Density | ??3.99g/cm 3 |
| Shock strength | ??70 |
| Bending strength (MPa) | ??400 |
| 500 ℃ of specific volume resistance (' Ω .cm) | ??10 12 |
| Dimensional precision | ??±0.03mm |
Embodiment 2:
1, raw material
Alumina-ceramic powder (Al
2O
3, 99.9%), paraffin (PW, chemical pure), oleic acid (OA, chemical pure).
2, experimentation
Load weighted whiteruss 1.2kg and oleic acid 0.2kg are heated to about 90 ℃ simultaneously, it is melted fully until being the settled solution shape.Slowly join above-mentioned dissolving in the material with 99.9% alumina-ceramic powder is disposable, stir with stirrer, treat thorough mixing after, with compound granulation in forcing machine.Compound is made and is about 2-4mm the most at last, the strip of the about 1-2mm of diameter, obtaining being fit to injection molding particulate materials. injection molding is finished on the Xiang SA type injection moulding machine in the sea everyday, the control injecting condition is: 88 ℃ of injection temperatures, injection pressure 60KPa, inject time 10s, screw rod 10s fall time; Dwell pressure is 25KPa, and the dwell time is 5s, and be 10s cooling time.
Sample is carried out degreasing, take off the ester temperature about 150 ℃, take off the ester time about 26 hours; With the degreasing base 1120 ℃ of biscuitings 2 hours; Place in the high-temperature hydrogen sintering oven 1700 ℃ keep 2 hours sintering finished.The sparking plug of preparation uses the transparent alumina performance with embodiment 1.
Claims (5)
1, a kind of injection molding technique of alumina ceramics for spark plugs is characterized in that, may further comprise the steps:
(1) batching: the material machine is closed in the oleic acid adding of 10-20 weight part paraffin and 1-5 weight part, be heated to 60-120 ℃, treat that material melts the high purity aluminium oxide powder that the back adds 100 weight parts fully;
(2) spice: each material stirring and evenly mixing in closing the material machine that proportioning is good, mixture temperature is higher than 60 ℃;
(3) granulation: the slurry of mixing is added tablets press, but utilize the extrusion screw rod of tablets press that slurry is extruded the plasticine bar, but with cutting unit the plasticine bar is cut into small-particle again;
(4) injection molding: the feeding mouth that particulate material is added to injection moulding machine, under the drive of injector screw rod, enter in the injecting cavity, control certain processing condition, the effect of extruding by the injector screw rod is pressed into ceramic size in the mould, and the injection technique condition is: injection temperature is 70-120 ℃, and injection pressure is 10-100KPa, be 8-12s inject time, screw rod fall time is 8-12s, and dwell pressure is 25KPa, and the dwell time is 8-12s for 4-6s cooling time;
(5) take off ester: adopt low temperature to take off the ester technology, take off 100-200 ℃ of ester temperature, taking off the ester time is 20-50 hour;
(6) biscuiting: biscuiting Wen Wendu is 1100-1300 ℃, is incubated 1-3 hour;
(7) high temperature sintering: 1600-1900 ℃ of following high temperature sintering time is 2-4 hour.
2, the injection molding technique of a kind of alumina ceramics for spark plugs according to claim 1 is characterized in that, prevents to bring into various impurity in the batch mixing process of (1) step.
3, the injection molding technique of a kind of alumina ceramics for spark plugs according to claim 1 is characterized in that, the low particle size that (3) step makes is: diameter 1-2mm, length is 2-4mm.
4, the injection molding technique of a kind of alumina ceramics for spark plugs according to claim 1, it is characterized in that, (4) the injection technique condition is in the step: injection temperature is 90-100 ℃, injection pressure is 40-60KPa, be 10s inject time, and screw rod fall time is 10s, and dwell pressure is 25KPa, dwell time is 5s, and be 10s cooling time.
5, the injection molding technique of a kind of alumina ceramics for spark plugs according to claim 1 is characterized in that, takes off 150 ℃ of ester temperature in (5) step, and taking off the ester time is 22-32 hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910044200A CN101643356A (en) | 2009-08-26 | 2009-08-26 | Injection molding process of alumina ceramics for spark plugs |
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| CN200910044200A CN101643356A (en) | 2009-08-26 | 2009-08-26 | Injection molding process of alumina ceramics for spark plugs |
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|---|---|---|---|
| CN200910044200A Pending CN101643356A (en) | 2009-08-26 | 2009-08-26 | Injection molding process of alumina ceramics for spark plugs |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105732015A (en) * | 2016-03-03 | 2016-07-06 | 福建省德化荣信陶瓷有限公司 | Domestic ceramic switch panel and manufacturing process thereof |
| CN106945151A (en) * | 2017-04-07 | 2017-07-14 | 江苏铭百圣耐火有限公司 | A kind of technological process of production for being injected into shape base alumina ceramic product |
| CN117447211A (en) * | 2023-10-20 | 2024-01-26 | 杭州中好新瓷科技有限公司 | Injection molding method of sialon ceramic |
-
2009
- 2009-08-26 CN CN200910044200A patent/CN101643356A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105732015A (en) * | 2016-03-03 | 2016-07-06 | 福建省德化荣信陶瓷有限公司 | Domestic ceramic switch panel and manufacturing process thereof |
| CN105732015B (en) * | 2016-03-03 | 2020-10-23 | 福建省德化荣信陶瓷有限公司 | Household ceramic switch panel and manufacturing process thereof |
| CN106945151A (en) * | 2017-04-07 | 2017-07-14 | 江苏铭百圣耐火有限公司 | A kind of technological process of production for being injected into shape base alumina ceramic product |
| CN117447211A (en) * | 2023-10-20 | 2024-01-26 | 杭州中好新瓷科技有限公司 | Injection molding method of sialon ceramic |
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Application publication date: 20100210 |