CN103553635A - Method for producing ceramic die core - Google Patents
Method for producing ceramic die core Download PDFInfo
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- CN103553635A CN103553635A CN201310523764.4A CN201310523764A CN103553635A CN 103553635 A CN103553635 A CN 103553635A CN 201310523764 A CN201310523764 A CN 201310523764A CN 103553635 A CN103553635 A CN 103553635A
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- ceramic core
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Abstract
The invention provides a method for producing a ceramic die core. The method comprises the following steps of (1) producing a ceramic die core blank; (2) pre-treating a filler for the shaping of the ceramic die core, specifically adding the filler to be treated into a nonmetal material hopper with de-ionized water, continuously stirring slurry obtained by mixing powder and de-ionized water, continuously dropwise adding analytically pure hydrochloric acid to adjust the pH value of the slurry to 4 to 6, stopping adding analytically pure hydrochloric acid when the pH value is changed by less than or equal to 0.2 within 5 minutes, continuing stirring the slurry for 10 to 60 minutes, standing and settling the slurry for 4 to 12 hours, pouring an upper-layer solution, washing settled powder for 1 to 3 times by using de-ionized water until the pH value of an obtained solution is 6 to 8, drying the powder finally sinking to the bottom at 100 to 140 DEG C, calcining the powder for 4 to 6 hours at 1200 to 1500 DEG C, and crushing and sieving the powder; (3) performing shaping calcination; (4) performing reinforcement reconditioning. The method is simple, economical and low in time consumption, manpower is saved, energy consumption is eliminated, the production efficiency of the ceramic die core is greatly improved, and the quality of the ceramic die core is improved.
Description
Technical field
The present invention relates to a kind of making method of ceramic core, specifically ceramic core moulding is carried out to simple pre-treatment with filler, save repeatedly belt carcass roasting filler step, the ceramic core any surface finish that filler roasting after processing goes out, without bulge, scaling, defects i.e.cracks.
Background technology
Ceramic core forms the crucial adaptor of complicated inner cavity while being the smart casting of gas turbine blades, aero engine turbine blades and other precision metallic parts, determining cavity shape and the precision of foundry goods.In order to meet the requirement of essence casting, ceramic core generally need to possess following condition:
high refractoriness;
coefficient of thermal expansion is low, dimensional stabilizing;
enough hot strengths and low temperature intensity;
chemical stability is good;
easily remove.For this reason, both at home and abroad mainly to take silica glass, fused corundom, zircon, magnesium oxide etc. be body material to the making method of ceramic core, adds a certain amount of mineralizer and softening agent sintering to form.The effect of mineralizer is acceleration of sintering, mainly contains zirconium white, magnesium oxide, aluminum oxide etc.; The effect of softening agent is to promote moulding, mainly contains paraffin, beeswax, polyethylene, EVA etc.
The making method of ceramic core generally comprises following steps:
powder mixes;
prepare slurry;
compression moulding;
moulding roasting;
strengthening finishing.Wherein, moulding roasting is the ceramic core idiosome of compression moulding to be imbedded to fill in Packed saggar, carry out high-temperature roasting.The effect one of filler is to absorb the softening agent melting in roasting process, the 2nd, maintain the ceramic core frame strength losing after softening agent, and prevent its deformed damaged.Therefore, the quality of filler greatly affects the sintering finished rate of ceramic core, and the character of filler and operation are one of contents of holding in close confidence of domestic and international Tao Xin producer.Filler composition, foreign matter content, size-grade distribution etc. are the important parameters that determines packing quality, and the embodiment of good filler is ceramic core smooth surface flawless after roasting, without distortion, without being split up, without bulge; Meanwhile, after filler roasting easily defeated and dispersed, do not lump, ceramic core easily takes out.Both at home and abroad conventional filler mainly contains high temperature alumina, kaolin etc., high temperature alumina due to have shrinking percentage little, be difficult for producing phase transformation, the advantage such as easy-sintering not, be most widely used.
External packing quality is better, but price has a surplus higher than domestic ten times, and domestic packing is subject to process technology limit, all exists foreign matter content high, size-grade distribution heterogeneity, and, during for core roasting, often there is glutinous sand, be split up, the defect such as bulge in the shortcoming such as fine powder is too much.At present, addressing this problem main method is: in moulding roasting process, first utilize waste and old ceramic core to imbed in filler and carry out roasting, reactive absorption falls impurity and the part fine powder such as contained sodium oxide, potassium oxide in filler; And then used ceramic core is taken out, carry out above-mentioned processing by filler is repeated multiple times, until the detrimental impurity in filler and fine powder content are reduced to acceptability limit.Finally, pack the filler after numerous and diverse routine processes like this into saggar, ceramic core idiosome is imbedded in filler to ram-jolt, roasting.The defect of this method is that inefficiency, workload are large, it is high to consume energy, and a batch of material need to repeat roasting through five or six times just can have good roasting effect; And during each belt carcass roasting, all need to use several waste and old Tao Xin, drop into a large amount of human and material resources and financial resources.Meanwhile, roasting meeting makes filler particle size reduction, reduces filler work-ing life.
Summary of the invention
The object of the invention is to: a kind of making method of ceramic core is provided, filler is carried out to simple pre-treatment, a step is removed detrimental impurity and the fine powder that affects ceramic core quality in filler, saves human and material resources and the energy, promotes ceramic core roasting quality.
The technical solution adopted in the present invention is:
A making method for ceramic core, comprises the following steps:
(1) make ceramic core idiosome;
(2) ceramic core moulding is carried out to pre-treatment with filler, concrete step is:
(3) filler after processing step (2) being obtained packs saggar into, then the ceramic core idiosome that step (1) is obtained imbeds in filler by certain interval and orientation, utilizes bobbing machine ram-jolt, puts into roasting kiln roasting.
(4) body of heater roasting is complete, is cooled to after room temperature, carefully takes out ceramic core in saggar, strengthens and repairs processing.
Described filler is high-temperature alumina filling material.
When described slurry stirs, guarantee that powder is suspended in deionized water, avoids powder to sink to the bottom.
Described step
in, while cleaning sedimentation powder at every turn, deionized water is mixed with sedimentation powder and stir 10-60min, after standing 4-12h, topple over upper solution.
The beneficial effect that the present invention produces is:
For solving after existing ceramic core roasting, be prone to scab, be split up, the defect such as bulge, and belt carcass calcination process filler mode length consuming time repeatedly, consumes energy high, the problem such as efficiency is low.The invention provides a kind of making method of ceramic core, utilize pickling mode effectively to remove detrimental impurity and fine powder in filler for ceramic core moulding by controlling pH and settling time simultaneously, the ceramic core that roasting goes out easily takes out, smooth surface zero defect, filler is without sintering, easily defeated and dispersed, and roasting effect is better than the fillers such as external kaolin.The method simple economy, consuming time short has greatly improved ceramic core production efficiency when saving manpower, eliminating energy consumption, has promoted ceramic core quality.
Embodiment
The present invention is a kind of making method of ceramic core, comprises the following steps:
(1) make ceramic core idiosome;
(2) ceramic core moulding is carried out to pre-treatment with filler, concrete step is:
continue to stir slurry, continue to splash into analytical pure hydrochloric acid, the pH value of slurry is adjusted to 4-6, when pH value changes≤0.2 in 5min, stop adding analytical pure hydrochloric acid, after continuation stirring slurry 10-60 min, standing sedimentation 4-12h;
(3) filler after processing step (2) being obtained packs saggar into, then the ceramic core idiosome that step (1) is obtained imbeds in filler by certain interval and orientation, utilizes bobbing machine ram-jolt, puts into roasting kiln roasting.
(4) body of heater roasting is complete, is cooled to after room temperature, carefully takes out ceramic core in saggar, strengthens and repairs processing.
In above-mentioned all stirring slurry processes, should guarantee that powder is suspended in deionized water, avoids powder to sink to the bottom.
In this embodiment, ceramic core moulding filler is high-temperature alumina filling material, can be also other ceramic core moulding filler, as kaolin etc.
Embodiment mono-
The first method that moulding is processed with filler to ceramic core as follows:
1. 40 kg high temperature alumina are joined in the nonmetal charging basket that fills 3 times of volumes of deionized water under whipped state, continue to stir 5min, avoid powder to sink to the bottom.
2. under whipped state, constantly splash into concentrated hydrochloric acid, by slurry pH regulator to 6.0, pH should change≤0.2 in 5min, continues to stir 10min, standing 4h.
3. outwell upper solution, add equivalent deionized water, mix, stir 10min, standing 4h, measures upper solution pH, if pH, between 6-8, topples over upper solution, residue powder is for further processing, otherwise repeats this step to upper strata pH value of solution to 6-8.
4. powder is put into baking oven, 100 ℃ of oven dry, then through 1500 ℃ of roasting 4h, pulverize, then sieve and can use through spin vibration sieve.
Embodiment bis-
The second method that moulding is processed with filler to ceramic core as follows:
1. 40 kg high temperature alumina are joined in the nonmetal charging basket that fills 3 times of volumes of deionized water under whipped state, continue to stir 10min, avoid powder to sink to the bottom.
2. under whipped state, constantly splash into concentrated hydrochloric acid, by slurry pH regulator to 5.0, pH should change≤0.2 in 5min, continues to stir 30min, standing 8h.
3. outwell upper solution, add equivalent deionized water, mix, stir 30min, standing 8h, measures upper solution pH, if pH, between 6-8, topples over upper solution, residue powder is for further processing, otherwise repeats this step to upper strata pH value of solution to 6-8.
4. powder is put into baking oven, 120 ℃ of oven dry, then through 1400 ℃ of roasting 5h, pulverize, then sieve and can use through spin vibration sieve.
Embodiment tri-
The third method that moulding is processed with filler to ceramic core as follows:
1. 40 kg high temperature alumina are joined in the nonmetal charging basket that fills 3 times of volumes of deionized water under whipped state, continue to stir 20min, avoid powder to sink to the bottom.
2. under whipped state, constantly splash into concentrated hydrochloric acid, by slurry pH regulator to 4.0, pH should change≤0.2 in 5min, continues to stir 60min, standing 12h.
3. outwell upper solution, add equivalent deionized water, mix, stir 60min, standing 12h, measures upper solution pH, if pH, between 6-8, topples over upper solution, residue powder is for further processing, otherwise repeats this step to upper strata pH value of solution to 6-8.
4. powder is put into baking oven, 140 ℃ of oven dry, then through 1200 ℃ of roasting 6h, pulverize, then sieve and can use through spin vibration sieve.
Claims (4)
1. a making method for ceramic core, is characterized in that, comprises the following steps:
(1) make ceramic core idiosome;
(2) ceramic core moulding is carried out to pre-treatment with filler, concrete step is:
pending filler is added in the nonmetal charging basket that fills deionized water, in adition process, constantly stir the slurry that powder and deionized water mix, after powder adds, continue to stir slurry 5-20 min;
(3) filler after processing step (2) being obtained packs saggar into, then the ceramic core idiosome that step (1) is obtained imbeds in filler by certain interval and orientation, utilizes bobbing machine ram-jolt, puts into roasting kiln roasting;
(4) body of heater roasting is complete, is cooled to after room temperature, carefully takes out ceramic core in saggar, strengthens and repairs processing.
2. the making method of ceramic core according to claim 1, is characterized in that, described filler is high-temperature alumina filling material.
3. the making method of ceramic core according to claim 1, is characterized in that, when described slurry stirs, guarantees that powder is suspended in deionized water, avoids powder to sink to the bottom.
4. the making method of ceramic core according to claim 1, is characterized in that described step
in, while cleaning sedimentation powder at every turn, deionized water is mixed with sedimentation powder and stir 10-60min, after standing 4-12h, topple over upper solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310523764.4A CN103553635B (en) | 2013-10-30 | 2013-10-30 | Method for producing ceramic die core |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310523764.4A CN103553635B (en) | 2013-10-30 | 2013-10-30 | Method for producing ceramic die core |
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| Publication Number | Publication Date |
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| CN103553635A true CN103553635A (en) | 2014-02-05 |
| CN103553635B CN103553635B (en) | 2015-02-18 |
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| CN201310523764.4A Active CN103553635B (en) | 2013-10-30 | 2013-10-30 | Method for producing ceramic die core |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104043770A (en) * | 2014-06-10 | 2014-09-17 | 中国科学院金属研究所 | Packing powder for sintering ceramic core |
| CN107999702A (en) * | 2017-12-22 | 2018-05-08 | 东方电气集团东方汽轮机有限公司 | A kind of ceramic core sinters formative technology |
| CN114085087A (en) * | 2021-12-03 | 2022-02-25 | 安徽应流航源动力科技有限公司 | Combined filler for sintering ceramic core and application method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1076877A (en) * | 1992-03-27 | 1993-10-06 | 北京航空航天大学 | Technique for making ceramic moulding core |
| CN103304227A (en) * | 2013-07-01 | 2013-09-18 | 沈阳铸造研究所 | Alumina-based ceramic core for directional solidification and preparation method thereof |
-
2013
- 2013-10-30 CN CN201310523764.4A patent/CN103553635B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1076877A (en) * | 1992-03-27 | 1993-10-06 | 北京航空航天大学 | Technique for making ceramic moulding core |
| CN103304227A (en) * | 2013-07-01 | 2013-09-18 | 沈阳铸造研究所 | Alumina-based ceramic core for directional solidification and preparation method thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104043770A (en) * | 2014-06-10 | 2014-09-17 | 中国科学院金属研究所 | Packing powder for sintering ceramic core |
| CN107999702A (en) * | 2017-12-22 | 2018-05-08 | 东方电气集团东方汽轮机有限公司 | A kind of ceramic core sinters formative technology |
| CN107999702B (en) * | 2017-12-22 | 2020-04-14 | 东方电气集团东方汽轮机有限公司 | Ceramic core sintering molding process |
| CN114085087A (en) * | 2021-12-03 | 2022-02-25 | 安徽应流航源动力科技有限公司 | Combined filler for sintering ceramic core and application method |
| CN114085087B (en) * | 2021-12-03 | 2022-11-18 | 安徽应流航源动力科技有限公司 | Combined filler for sintering ceramic core and application method |
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| CN103553635B (en) | 2015-02-18 |
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