CN1562522A - Manufacturing technique for precision investment casting die body made from magnesium alloy - Google Patents
Manufacturing technique for precision investment casting die body made from magnesium alloy Download PDFInfo
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- CN1562522A CN1562522A CN 200410008962 CN200410008962A CN1562522A CN 1562522 A CN1562522 A CN 1562522A CN 200410008962 CN200410008962 CN 200410008962 CN 200410008962 A CN200410008962 A CN 200410008962A CN 1562522 A CN1562522 A CN 1562522A
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Abstract
A ceramic mould for casting Mg-alloy workpiece features that its surface layer is prepared from ZrO2 gel, Al2O3 powder, surfactant and defoaming agent through proportional mixing and sprinkling fine Al2O3 sand, and the slurry for back layer is prepared from silicon gel, coal gangue powder, surfactant and defoaming agent through proportionally mixing and sprinkling coal gauge sand. Its advantage is high uniformity and surface finish quality of casting.
Description
Technical field
The present invention relates to a kind of formwork of investment precision casting technology method cast magnesium alloy part and preparation method of this formwork of adopting, specifically, be meant a kind of ceramic shell that investment pattern precision casting cast magnesium alloy parts uses and preparation technology of this ceramic shell of being specifically designed to.
Background technology
Traditional investment pattern precision casting formwork all adopts and contains SiO
2Binding agent, violent chemical reaction will take place in magnesium alloy liquid and formwork in the casting process, cause the Mg alloy castings top layer concentric portion of composition inconsistent, even owing to violent oxidation can't be shaped, for avoiding the chemical reaction in casting process, the present invention adopts a kind of no SiO
2The gel of binding agent and the refractory material that the magnesium alloy high-temperature fusant is inertia produced formwork and prepare Mg alloy castings with this.
Precision-investment casting is meant employing and actual part shape and the corresponding to wax-pattern of the size making apperance as the casting shell, after being combined in it in casting system, utilize the way of coating to make the casting shell, dewaxing, burn shell after to be dried handles, and metal liquid is cast in the die cavity of shell, after solidifying, ceramic shell smashed to obtain needed metal casting.
Summary of the invention
One of purpose of the present invention is to disclose a kind of SiO that do not contain
2The ceramic mould formwork of binding agent.
Two of purpose of the present invention is to disclose a kind of preparation technology who prepares the ceramic mould formwork.
A kind of preparation technology who prepares the ceramic shell that Mg alloy castings uses of the present invention, it is characterized in that: this technology has following steps:
(A) dilution zirconium dioxide gel
Take by weighing an amount of zirconium dioxide, utilize absolute ethyl alcohol that it is diluted according to stoste zirconium dioxide concentration, dilution back concentration is controlled at 14%～20%, leaves standstill more than 6 hours 18～25 ℃ of room temperatures, and is stand-by;
(B) preparation slip
(A) liquid is stirred, stirring simultaneously slowly adding aluminium oxide powder, granularity is 120～280 orders, powder liquor ratio 4～7: 1, simultaneously, add the defoamer of the surfactant and 0.05～1% (percentage by weight) of 0.05～1% (percentage by weight), the slip for preparing leaves standstill more than 12 hours 18～25 ℃ of room temperatures, and is stand-by;
(C) the precision casting technology method is produced wax-pattern routinely, and carry out module combination, module cleans, dries, and is stand-by;
(D) module is carried out coating, form the surface layer of ceramic shell
(C) put into evenly dipping of (B) slip, treat after the taking-up that surperficial slip evenly and after not having flow liner carries out the stucco operation; After to be dried, it is put into once more the surface layer that (B) slip carries out again coating and stucco formation ceramic shell, its sanding material is the alundum (Al fine sand, and granularity is 80～100 orders, under the natural drying condition, and 15～24 hours interlayer drying time;
(E) surface layer is carried out reinforced layered slurry, form the backing layer of ceramic shell
To adopt conventional coating method to be coated with through the surface of the module after (D) handles and hang silica-based coating, and carry out the stucco operation, and form the backing layer of ceramic shell so repeatedly for 3～6 times, sanding material be the bastard coal stone sand, and granularity is 30～90 orders;
(F) dewaxing
To put into baking oven or microwave carries out dewaxing treatment through the shell after (E) handles;
(G) burn shell
To adopt conventional burning shell side method to carry out sintering processes through the shell after (F) handles in high temperature furnace, sintering temperature is controlled at 600 ℃～700 ℃, burns 50～90 minutes shell time, promptly gets ceramic shell.
Advantage of the present invention is: detect foundry goods through the low power metallographic, crystal particle scale is more tiny than conventional sand casting, and cast(ing) surface fineness, dimensional accuracy are suitable with the same process aluminum casting.Cast(ing) surface composition and heart portion basically identical.The ceramic mould formwork has chemical stability to magnesium alloy under hot conditions, satisfy thin-walled, ultra-thin-wall complicated shape part forming technological requirement simultaneously, and the cheap relatively system shell technology of environmentally safe, cost certainly will be to the expansion of magnesium and magnesium alloy range of application thereof up to impetus.
Description of drawings
Fig. 1 is the cross-sectional view of ceramic shell of the present invention.
Among the figure: 1. surface layer 2. backing layers
Fig. 2 is the photo in kind that adopts an embodiment of the ceramic shell that preparation technology of the present invention makes.
Fig. 3 is preparation technology's flow chart of ceramic shell of the present invention.
The specific embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
The invention discloses a kind of preparation technology who prepares the ceramic shell that Mg alloy castings uses, the surface layer 1 of ceramic shell is become with defoamer mixing stirring preparation face less than the surfactant of 120 purpose aluminium oxide powders, 0.05～1% (percentage by weight) by zirconium dioxide gel, the granularity of concentration 14%～20%, and its sanding material is blue Al 2 O fine sand; Backing layer 2 slips are formulated less than the surfactant and the defoamer mixing stirring of 120 purpose gangue micro mists, 0.05～1% (percentage by weight) by silicon gel, the granularity of concentration 16%～20%, and its sanding material is the bastard coal stone sand.The ceramic shell surface layer that obtains through preparation technology of the present invention does not contain SiO
2Binding agent detects through the low power metallographic through the Mg alloy castings of this technology preparation, and crystal particle scale is more tiny than conventional sand casting, and cast(ing) surface fineness, dimensional accuracy are suitable with the same process aluminum casting.Cast(ing) surface composition and heart portion basically identical.The ceramic mould formwork has chemical stability to magnesium alloy under hot conditions, and environmentally safe.
Preparation Mg alloy castings of the present invention comprises the steps: with the preparation technology of ceramic mould formwork
(A) dilution zirconium dioxide gel
Take by weighing an amount of zirconium dioxide, utilize absolute ethyl alcohol that it is diluted according to stoste zirconium dioxide concentration, dilution back concentration is controlled at 14%～20%, leaves standstill more than 6 hours 18～25 ℃ of room temperatures, and is stand-by;
(B) preparation slip
(A) liquid is stirred, stirring simultaneously slowly adding aluminium oxide powder, granularity is 120～280 orders, powder liquid (the zirconium dioxide liquid after aluminium oxide powder and the dilution) is than 4～7: 1, the defoamer that the surfactant that adds 0.05～1% (percentage by weight) simultaneously strengthens the powder liquid wetting, add 0.05～1% (percentage by weight) is removed bubble in the slurry, fully guarantee the surface smoothness of shell surface layer, the slip for preparing leaves standstill more than 12 hours 18～25 ℃ of room temperatures, and is stand-by;
(C) the precision casting technology method is produced wax-pattern routinely, and carries out module and make up, carry out the module cleaning, dry, and is stand-by;
(D) module is carried out coating, form the surface layer of ceramic shell
(C) put into evenly dipping of (B) slip, treat after the taking-up that surperficial slip evenly and after not having flow liner carries out the stucco operation, after to be dried, it is put into once more the surface layer that (B) slip carries out again coating and stucco formation ceramic shell, its sanding material is the alundum (Al fine sand, and granularity is 80～100 orders; Under the natural drying condition, the interlayer drying time is about 15～24 hours.Investment precoat thickness should look part shape with the number of plies and the different of size are suitably adjusted, and generally is controlled at 1～3 layer.
(E) surface layer is carried out reinforced layered slurry, form the backing layer of ceramic shell
To adopt conventional coating method to be coated with through the surface of the module after (D) handles and hang silica-based coating, and carry out the stucco operation, and carry out several so repeatedly, general reinforced layered slurry number of times be controlled at 3～6 layers, and sanding material is the bastard coal stone sand, and granularity is 30～90 orders; It should be noted that the abundant drying that must guarantee last coating between layer and the layer, can not have phenomenons such as Hui Rong, bulging to take place to prevent that investment precoat from chapping.The preparation of silica-based coating with (B) with, just colloid is the conventional siliceous gel that adopts of hot investment casting, as Ludox, silicate hydrolyzate liquid etc., powder is the refractory material colliery powder, granularity is 120～280 orders.
(F) dewaxing
To put into baking oven or microwave carries out dewaxing treatment through the shell after (E) handles;
(G) burn shell
To put into high temperature furnace through the shell after (F) handles and adopt the conventional shell side method of burning to carry out sintering processes, promptly get ceramic shell.Sintering temperature is controlled at 600 ℃～700 ℃.Burn the shell process and be no lack of province's spalling, should suitably control firing rate, generally be warming up to 300 ℃ of insulations 20～30 minutes, be warming up to 600 ℃～700 ℃ insulations 30～50 minutes more continuously with stove for guaranteeing shell, can the direct pouring foundry goods or cooling after stand-by.
In the present invention, binding agent adopts the not silica containing organosol that magnesium alloy fused mass is had stability at elevated temperature---and zirconium dioxide gel, colloidal solid are of a size of and guarantee generally to be controlled at 20～100nm scope with the powder coupling.The surface layer refractory material is selected aluminium oxide powder for use, and sanding material is to adopt the alundum (Al fine sand equally.Binding agent adopts not silica containing organosol.
Before the preparation of surface layer slip, at first should adjust organosol viscosity, the too high powder liquor ratio that influences of viscosity, crossing low shell surface layer easily peels off, the powder liquor ratio is controlled at 4.5～6.5 in the actual mechanical process: 1, the activating agent that adds trace can improve the wetability of powder and binding agent on the one hand, can improve the extension that is coated with of slip on the other hand.Activating agent is preferably selected organic matter, is beneficial to remove fully in high-temperature sintering process.Slip should stir more than 4 hours 18～25 ℃ of room temperatures, and parks and re-used later in 12 hours.Second layer surface layer slurry should be adjusted viscosity, makes it can fully soak into ground floor and can not make ground floor Hui Rong again.Two surface layer sanding material are magnesium liquid are chemically stable oxide.
Embodiment
(A) dilution 1000ml zirconium dioxide gel
In 1000ml zirconium dioxide gel, add absolute ethyl alcohol with its dilution for concentration at 20% zirconium dioxide coagulant liquid, left standstill 6 hours 20 ℃ of room temperatures, stand-by;
(B) preparation slip
(A) liquid is stirred, adding 4000g granularity is 120 purpose aluminium oxide powders stirring simultaneously slowly, the surfactant cleaning solution that adds 0.5g simultaneously is as strengthening the powder liquid wetting, the defoamer n-octyl alcohol that adds 0.6g is simultaneously removed bubble in the slurry, the slip for preparing is left standstill 12 hours for 20 ℃ in room temperature, stand-by;
(C) the precision casting technology method is produced wax-pattern routinely, and carries out module and make up, carry out the module cleaning, dry, and is stand-by;
Produce warm mould material in the wax-pattern employing in this embodiment, press the wax temperature to be controlled at 47～53 ℃, molding pressure is controlled at 0.1～0.4MP, and 5～20 seconds dwell times, mold temperature is looked concrete part shape, size is made by oneself, is generally 25～35 ℃.
(D) module is carried out coating, form the surface layer of ceramic shell
(C) put into (B) slip on the even dipping of (B) slip, treat after the taking-up that surperficial slip evenly and after not having flow liner carries out the stucco operation, its sanding material is the alundum (Al fine sand, and granularity is 80 orders; After to be dried, it put into once more (B) slip and carry out again (B) slip on the even dipping, treat after the taking-up that surperficial slip evenly and after not having flow liner carries out the stucco operation; Coating can suitably be adjusted the surface layer that 3 coating of repetition and stucco promptly obtain having three-decker in this step with the stucco operation in this step through molten mould essence casting part shape and the different of size according to need.Under natural drying condition, the interlayer drying time is about 24 hours.
(E) surface layer is carried out reinforced layered slurry, form the backing layer of ceramic shell
To adopt conventional coating method to be coated with through the surface of the module after (D) handles and hang silica-based coating, and carry out the stucco operation, sanding material be the bastard coal stone sand, and granularity is 30 orders; The stucco number of operations that carries out coating in this step can be controlled at 6 layers, it should be noted that the abundant drying that must guarantee last coating between layer and the layer, can not have phenomenons such as Hui Rong, bulging to take place to prevent that investment precoat from chapping.The preparing process of required silica-based coating is identical with preparation slip (B) in this step, just colloid is the conventional siliceous gel that adopts of hot investment casting, as Ludox, silicate hydrolyzate liquid etc., adopt deionized water to dilute during dilution silicon gel, diluted concentration is 16～20%, powder is the refractory material colliery powder, and granularity is 120 orders.
(F) dewaxing
To put into baking oven or microwave carries out dewaxing treatment through the shell after (E) handles;
(G) burn shell
To put into high temperature furnace through the shell after (F) handles and adopt the conventional shell side method of burning to carry out sintering processes, promptly get ceramic shell.Sintering temperature is controlled at 600 ℃.Burn the shell process for guaranteeing that spalling does not take place shell, should suitably control firing rate, generally be warming up to 300 ℃ of insulations 30 minutes, be warming up to 600 ℃ more continuously,, promptly burn casing tech and finish this temperature insulation 30 minutes with stove.
Through ceramic shell that this technology prepares can the direct pouring foundry goods or cooling after stand-by.
Detect foundry goods through the low power metallographic, crystal particle scale is more tiny than conventional sand casting, and cast(ing) surface fineness, dimensional accuracy are suitable with the same process aluminum casting.Cast(ing) surface composition and heart portion basically identical.The ceramic mould formwork has chemical stability to magnesium alloy under hot conditions, satisfy thin-walled, ultra-thin-wall complicated shape part forming technological requirement simultaneously, and the cheap relatively system shell technology of environmentally safe, cost certainly will be to the expansion of magnesium and magnesium alloy range of application thereof up to impetus.
Claims (10)
1, a kind of preparation technology who prepares the ceramic shell that Mg alloy castings uses, it is characterized in that: this technology has following steps:
(A) dilution zirconium dioxide gel
Take by weighing an amount of zirconium dioxide, utilize absolute ethyl alcohol that it is diluted according to stoste zirconium dioxide concentration, dilution back concentration is controlled at 14%～20%, leaves standstill more than 6 hours 18～25 ℃ of room temperatures, and is stand-by;
(B) preparation slip
(A) liquid is stirred, stirring simultaneously slowly adding aluminium oxide powder, granularity is 120～280 orders, powder liquor ratio 4～7: 1, simultaneously, add the defoamer of the surfactant and 0.05～1% (percentage by weight) of 0.05～1% (percentage by weight), the slip for preparing leaves standstill more than 12 hours 18～25 ℃ of room temperatures, and is stand-by;
(C) the precision casting technology method is produced wax-pattern routinely, and carry out module combination, module cleans, dries, and is stand-by;
(D) module is carried out coating, form the surface layer of ceramic shell
(C) put into evenly dipping of (B) slip, treat after the taking-up that surperficial slip evenly and after not having flow liner carries out the stucco operation; After to be dried, it is put into once more the surface layer that (B) slip carries out again coating and stucco formation ceramic shell, its sanding material is the alundum (Al fine sand, and granularity is 80～100 orders, under the natural drying condition, and 15～24 hours interlayer drying time;
(E) surface layer is carried out reinforced layered slurry, form the backing layer of ceramic shell
To adopt conventional coating method to be coated with through the surface of the module after (D) handles and hang silica-based coating, and carry out the stucco operation, and form the backing layer of ceramic shell so repeatedly for 3～6 times, sanding material be the bastard coal stone sand, and granularity is 30～90 orders;
(F) dewaxing
To put into baking oven or microwave carries out dewaxing treatment through the shell after (E) handles;
(G) burn shell
To adopt conventional burning shell side method to carry out sintering processes through the shell after (F) handles in high temperature furnace, sintering temperature is controlled at 600 ℃～700 ℃, burns 50～90 minutes shell time, promptly gets ceramic shell.
2, the preparation technology of ceramic shell according to claim 1 is characterized in that: in processing step (D), investment precoat thickness should look the magnesium alloy parts shape with the number of plies and the different of size are suitably adjusted, and generally is controlled at 1～3 layer.
3, the preparation technology of ceramic shell according to claim 1 is characterized in that: silica-based coating required in processing step (E) is formulated as:
Utilize deionized water that it is diluted the silicon gel strength, dilution back concentration is controlled at 16%～20%, leaves standstill more than 6 hours 18～25 ℃ of room temperatures, and is stand-by;
Silicon coagulant liquid after the dilution is stirred, stirring simultaneously slowly adding colliery powder micro mist, granularity is 120～280 orders, the powder liquor ratio reaches 4～7: 1, simultaneously, the defoamer that adds the surfactant and 0.05～1% (percentage by weight) of 0.05～1% (percentage by weight) prepares the back and leaves standstill more than 12 hours 18～25 ℃ of room temperatures, and is stand-by.
4, the preparation technology of ceramic shell according to claim 3 is characterized in that: silica-based coating can be Ludox or silicate hydrolyzate liquid.
5, the preparation technology of ceramic shell according to claim 1 is characterized in that: the powder liquor ratio is controlled at 4.5～6.5 in processing step (B): 1.
6, the preparation technology of ceramic shell according to claim 1, it is characterized in that: sintering temperature should suitably be controlled firing rate in processing step (G), generally be warming up to 300 ℃ of insulations 20～30 minutes, be warming up to 600 ℃～700 ℃ insulations 30～50 minutes more continuously with stove.
7, the preparation technology of ceramic shell according to claim 1 is characterized in that: carry out coating next time after palpus assurance shell will make the abundant drying of aspect after whenever carrying out primary coating in investment precoat (D) step and backing layer coating (E) step again.
8, the preparation technology of ceramic shell according to claim 1 is characterized in that: the ceramic shell for preparing is surface layer and backing layer structure,
Its surface layer material is: zirconium dioxide gel, granularity by concentration 14%～20% stir formulated less than the defoamer mixing of the surfactant and 0.05～1% (percentage by weight) of 120 purpose aluminium oxide powders, 0.05～1% (percentage by weight), its sanding material is the alundum (Al fine sand, and granularity is 80～100 orders;
Its backing layer material is: silicon gel, granularity by concentration 16%～20% stir formulated less than the defoamer mixing of the surfactant and 0.05～1% (percentage by weight) of 120 purpose gangue micro mists, 0.05～1% (percentage by weight), sanding material is the bastard coal stone sand, and granularity is 30～90 orders.
9, according to the preparation technology of claim 1,8 described ceramic shells, it is characterized in that: described activating agent can be cleaning solution or alkylbenzenesulfonate; Described defoamer can be n-octyl alcohol or isoamyl alcohol.
10, the preparation technology of ceramic shell according to claim 1 is characterized in that: but ceramic shell direct pouring foundry goods for preparing or cooling back are stand-by.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410008962 CN1562522A (en) | 2004-03-22 | 2004-03-22 | Manufacturing technique for precision investment casting die body made from magnesium alloy |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410008962 CN1562522A (en) | 2004-03-22 | 2004-03-22 | Manufacturing technique for precision investment casting die body made from magnesium alloy |
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| CN1562522A true CN1562522A (en) | 2005-01-12 |
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| CN 200410008962 Pending CN1562522A (en) | 2004-03-22 | 2004-03-22 | Manufacturing technique for precision investment casting die body made from magnesium alloy |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101213037B (en) * | 2005-06-29 | 2010-12-01 | 日产化学工业株式会社 | Processes for production of slurries and molds for precision casting |
| CN102303097A (en) * | 2011-05-18 | 2012-01-04 | 大连金河铸造有限公司 | Sand core microwave drying kiln |
| CN102974761A (en) * | 2012-12-04 | 2013-03-20 | 中国航空工业集团公司北京航空材料研究院 | Preparation method for calcium zirconate formwork through titanium and titanium aluminium alloy fired mould precision casting |
| CN103111585A (en) * | 2013-02-04 | 2013-05-22 | 中国兵器工业第五九研究所 | Method for preparing ceramic gypsum composite mould by using magnesium alloy |
| CN103264139A (en) * | 2013-05-23 | 2013-08-28 | 江苏久联冶金机械制造有限公司 | Water glass and silica solution composite shell manufacturing method |
| CN104353784A (en) * | 2014-10-31 | 2015-02-18 | 沈阳黎明航空发动机(集团)有限责任公司 | Precision casting method for complex thin-wall structural member framework of high-temperature alloy cavity |
| CN104475682A (en) * | 2014-12-17 | 2015-04-01 | 北京航空航天大学 | Combined wax pattern-based method of achieving precision investment casting for heat-resistant cast steel thin-wall turbine shell |
| CN105834363A (en) * | 2016-06-03 | 2016-08-10 | 扬州峰明金属制品有限公司 | Precise low-pressure lost wax casting system |
| WO2017114064A1 (en) * | 2015-12-29 | 2017-07-06 | 张建勋 | Method for preparing environmentally friendly fine casting mould shell |
| WO2017114065A1 (en) * | 2015-12-29 | 2017-07-06 | 张建勋 | Method for preparing environmentally friendly casting material |
| WO2017114071A1 (en) * | 2015-12-29 | 2017-07-06 | 张建勋 | Method for preparing breathable moulding shell |
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2004
- 2004-03-22 CN CN 200410008962 patent/CN1562522A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101213037B (en) * | 2005-06-29 | 2010-12-01 | 日产化学工业株式会社 | Processes for production of slurries and molds for precision casting |
| CN102303097A (en) * | 2011-05-18 | 2012-01-04 | 大连金河铸造有限公司 | Sand core microwave drying kiln |
| CN102303097B (en) * | 2011-05-18 | 2013-07-24 | 大连金河铸造有限公司 | Sand core microwave drying kiln |
| CN102974761A (en) * | 2012-12-04 | 2013-03-20 | 中国航空工业集团公司北京航空材料研究院 | Preparation method for calcium zirconate formwork through titanium and titanium aluminium alloy fired mould precision casting |
| CN103111585B (en) * | 2013-02-04 | 2017-12-29 | 中国兵器工业第五九研究所 | A kind of preparation technology of magnesium alloy cast ceramics gypsum composite mould |
| CN103111585A (en) * | 2013-02-04 | 2013-05-22 | 中国兵器工业第五九研究所 | Method for preparing ceramic gypsum composite mould by using magnesium alloy |
| CN103264139A (en) * | 2013-05-23 | 2013-08-28 | 江苏久联冶金机械制造有限公司 | Water glass and silica solution composite shell manufacturing method |
| CN104353784A (en) * | 2014-10-31 | 2015-02-18 | 沈阳黎明航空发动机(集团)有限责任公司 | Precision casting method for complex thin-wall structural member framework of high-temperature alloy cavity |
| CN104475682A (en) * | 2014-12-17 | 2015-04-01 | 北京航空航天大学 | Combined wax pattern-based method of achieving precision investment casting for heat-resistant cast steel thin-wall turbine shell |
| WO2017114064A1 (en) * | 2015-12-29 | 2017-07-06 | 张建勋 | Method for preparing environmentally friendly fine casting mould shell |
| WO2017114065A1 (en) * | 2015-12-29 | 2017-07-06 | 张建勋 | Method for preparing environmentally friendly casting material |
| WO2017114071A1 (en) * | 2015-12-29 | 2017-07-06 | 张建勋 | Method for preparing breathable moulding shell |
| CN105834363A (en) * | 2016-06-03 | 2016-08-10 | 扬州峰明金属制品有限公司 | Precise low-pressure lost wax casting system |
| CN105834363B (en) * | 2016-06-03 | 2018-05-22 | 扬州峰明金属制品有限公司 | A kind of low pressure loses the close casting system of cerotin |
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