CN105750483A - Antioxidant water-based lost foam casting coating for magnesium alloy casting and preparation method thereof - Google Patents
Antioxidant water-based lost foam casting coating for magnesium alloy casting and preparation method thereof Download PDFInfo
- Publication number
- CN105750483A CN105750483A CN201610273343.4A CN201610273343A CN105750483A CN 105750483 A CN105750483 A CN 105750483A CN 201610273343 A CN201610273343 A CN 201610273343A CN 105750483 A CN105750483 A CN 105750483A
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- Prior art keywords
- magnesium alloy
- coating
- lost foam
- casting
- water
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
- B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould
Abstract
The invention discloses an antioxidant water-based lost foam casting coating for magnesium alloy casting.According to the lost foam casting coating, the kieselguhr and quartz sand which are subjected to heat conductive modification and aluminum-rich spinel micro powder are mixed to be used as refractory aggregate, and meanwhile molybdenum disulfide, potassium fluoride and the other raw materials are added, so that a coating layer formed by the coating has the good antioxidant performance under the high temperature, the oxidation wrinkling phenomenon existing in the magnesium alloy casting process can be effectively relieved; the coating has the goods functions of breathability, flame retardancy, friction reduction and the like, has the adjusting effect on the temperature inside a casting cavity, and is not likely to be dispersed or lose efficacy and capable of greatly improving the quality of the magnesium alloy casting.
Description
Technical field
The present invention relates to lost foam casting coating technical field, particularly relate to a kind of water base lost foam paint of magnesium alloy cast antioxidation and preparation method thereof.
Background technology
In recent years, magnesium alloy just progressively replaces part ferrum and steel by its excellent combination property, become application material more and more widely, at automobile, the application in the fields such as aviation is especially prominent, and evaporative pattern casting magnesium alloy foundry goods is also noticeable research direction, Technology of EPC is used to have technique simple, casting dimension accuracy is high, advantage that allowance is little etc., relatively low yet with pouring temperature in the lost foam casting process of Mg alloy castings, evaporative pattern gasification comparatively difficulty, evaporative pattern is in a liquid state more, and magnesium metalline is active, very easily oxidizing fire, ultimately result in foundry goods and hole occurs, the defects such as oxidation elephant skin, cause its poor mechanical property, use is restricted.
In lost foam casting process, lost foam paint plays the effect of key, it is that lost foam casting obtains the requisite auxiliary material of premium casting, cast article all will be produced vital impact by the character such as its breathability, strength of coating, rheological characteristic, the coating selecting function admirable can effectively reduce the casting flaw of Mg alloy castings, and desirable coating should possess good breathability, wellability, adsorptivity and antioxidation, fire-retardant etc. effect." development of silica flour evaporative pattern casting magnesium alloy coating " literary composition is using silica flour, kieselguhr as refractory aggregate, sodium bentonite, CMC are as suspending agent, dextrin and Ludox have prepared the magnesium alloy evaporative-pattern die coating material with highly-breathable and flame retardant effect as bonding agent, but the coating poor thermal conductivity formed in this coating casting process, cause that type cavity temperature is too high, flame retardant effect is undesirable, and a large amount of combustion oxidations of magnesium metal cause that major defect occurs in foundry goods.
Summary of the invention
The object of the invention is contemplated to make up the defect of prior art, it is provided that a kind of water base lost foam paint of magnesium alloy cast antioxidation and preparation method thereof.
The present invention is achieved by the following technical solutions:
A kind of water base lost foam paint of magnesium alloy cast antioxidation, it is characterized in that, this coating is made up of the raw material of following weight portion: silica flour 30-40, heat conduction modification infusorial earth 10-20, aluminium riched spinel micropowder 10-15, hydroxypropyl methyl cellulose 2-3, tetraethyl orthosilicate 2-5, Firebrake ZB 0.1-0.2, sodium lignin sulfonate 0.1-0.2, molybdenum bisuphide 1-2, potassium fluoride 0.1-0.2, dehydrated alcohol 20-30, deionized water 30-50, concentration are the dilute hydrochloric acid solution 5-10 of 15-20%.
Described heat conduction modification infusorial earth is prepared by following methods:
(1) first being pulverized after remove impurity by kieselguhr, cross 200-300 mesh sieve, sieving is standby；
(2) aluminum isopropylate. is mixed with deionized water, heating in water bath is to 80-90 DEG C, solution ultrasonic agitation mixing 2-3h, adds the salpeter solution that appropriate concentration is 2mol/L after solution ph no longer changes, and adjustment solution ph is 4-5, then raise temperature to 95-100 DEG C, add, after continuing stirring mixing 1-2h, the material that step (1) obtains, be uniformly mixed post-heating to 500-600 DEG C, roasting 2-3h under vacuum, take out after naturally cooling to room temperature subsequently, obtain heat conduction modification infusorial earth.
Aluminum isopropylate. in described step (2), kieselguhr, deionized water weight ratio be 1:10:10-20.
The preparation method of described a kind of water base lost foam paint of magnesium alloy cast antioxidation is: first by sodium lignin sulfonate, hydroxypropyl methyl cellulose, molybdenum bisuphide and dehydrated alcohol, deionized water mixed grinding dispersion 30-50min, it is subsequently added tetraethyl orthosilicate, dilute hydrochloric acid solution is dripped after stirring reaction 20-30min, add other leftover materials after completion of dropwise addition after hybrid reaction 40-50min, after mixing dispersion 2-3h, namely obtain this water based paint.
Lost foam paint prepared by the present invention leads thermally-denatured kieselguhr using process and quartz sand, aluminium riched spinel micropowder mix as refractory aggregate, with the addition of the raw material such as molybdenum bisuphide, potassium fluoride simultaneously, the coating that this kind of coating is formed is made at high temperature to have excellent antioxidant performance, can be effectively improved in magnesium alloy pouring process occur oxidation elephant skin phenomenon, this coating has the functions such as good ventilative, fire-retardant, antifriction, casting type cavity temperature there is adjustment effect, not easily defeated and dispersed inefficacy, can improve the quality of Mg alloy castings greatly.
Detailed description of the invention
A kind of water base lost foam paint of magnesium alloy cast antioxidation, it is characterized in that, this coating is made up of the raw material of following weight portion: silica flour 30, heat conduction modification infusorial earth 10, aluminium riched spinel micropowder 10, hydroxypropyl methyl cellulose 2, tetraethyl orthosilicate 2, Firebrake ZB 0.1, sodium lignin sulfonate 0.1, molybdenum bisuphide 1, potassium fluoride 0.1, dehydrated alcohol 20, deionized water 30, concentration are the dilute hydrochloric acid solution 5 of 15%.
Wherein heat conduction modification infusorial earth is prepared by following methods:
(1) first being pulverized after remove impurity by kieselguhr, cross 200 mesh sieves, sieving is standby；
(2) aluminum isopropylate. is mixed with deionized water, heating in water bath is to 80 DEG C, solution ultrasonic agitation mixing 2h, adds the salpeter solution that appropriate concentration is 2mol/L after solution ph no longer changes, and regulating solution ph is 4, then raise temperature to 95 DEG C, add, after continuing stirring mixing 1h, the material that step (1) obtains, be uniformly mixed post-heating to 500 DEG C, roasting 2h under vacuum, take out after naturally cooling to room temperature subsequently, obtain heat conduction modification infusorial earth.
Wherein aluminum isopropylate. in step (2), kieselguhr, deionized water weight ratio be 1:10:10.
The preparation method of this coating is: first by sodium lignin sulfonate, hydroxypropyl methyl cellulose, molybdenum bisuphide and dehydrated alcohol, deionized water mixed grinding dispersion 30min, it is subsequently added tetraethyl orthosilicate, dilute hydrochloric acid solution is dripped after stirring reaction 20min, add other leftover materials after completion of dropwise addition after hybrid reaction 40min, after mixing dispersion 2h, namely obtain this water based paint.
The coating property test result obtained is:
Density: 1.32g/mm3；Suspensibility: 96%；Viscosity: 65mP.s；Thixotroping rate: 18%；Low temperature breathability: 18.5cm2.(KPa.min)-1；Hot permeability (800 DEG C): 28.6cm2.(KPa.min)-1；Strength of coating: 920g/mm；Heat conductivity: 0.24W/ (m.k).
Being squeegeed onto forming thickness on foam plastic sample surface is the dope layer of 0.5mm, and drying carries out magnesium alloy member cast after processing subsequently, the Mg alloy castings any surface finish obtained, surface roughness≤Ra10.5 μm, non-oxidation elephant skin phenomenon.
Claims (4)
1. the water base lost foam paint of magnesium alloy cast antioxidation, it is characterized in that, this coating is made up of the raw material of following weight portion: silica flour 30-40, heat conduction modification infusorial earth 10-20, aluminium riched spinel micropowder 10-15, hydroxypropyl methyl cellulose 2-3, tetraethyl orthosilicate 2-5, Firebrake ZB 0.1-0.2, sodium lignin sulfonate 0.1-0.2, molybdenum bisuphide 1-2, potassium fluoride 0.1-0.2, dehydrated alcohol 20-30, deionized water 30-50, concentration are the dilute hydrochloric acid solution 5-10 of 15-20%.
2. a kind of water base lost foam paint of magnesium alloy cast antioxidation as claimed in claim 1, it is characterised in that described heat conduction modification infusorial earth is prepared by following methods:
(1) first being pulverized after remove impurity by kieselguhr, cross 200-300 mesh sieve, sieving is standby；
(2) aluminum isopropylate. is mixed with deionized water, heating in water bath is to 80-90 DEG C, solution ultrasonic agitation mixing 2-3h, adds the salpeter solution that appropriate concentration is 2mol/L after solution ph no longer changes, and adjustment solution ph is 4-5, then raise temperature to 95-100 DEG C, add, after continuing stirring mixing 1-2h, the material that step (1) obtains, be uniformly mixed post-heating to 500-600 DEG C, roasting 2-3h under vacuum, take out after naturally cooling to room temperature subsequently, obtain heat conduction modification infusorial earth.
3. the water base lost foam paint of magnesium alloy cast antioxidation as claimed in claim 2 a kind of, it is characterised in that aluminum isopropylate. in described step (2), kieselguhr, deionized water weight ratio be 1:10:10-20.
4. the preparation method of a kind of water base lost foam paint of magnesium alloy cast antioxidation as claimed in claim 1, it is characterized in that, described preparation method is: first by sodium lignin sulfonate, hydroxypropyl methyl cellulose, molybdenum bisuphide and dehydrated alcohol, deionized water mixed grinding dispersion 30-50min, it is subsequently added tetraethyl orthosilicate, dilute hydrochloric acid solution is dripped after stirring reaction 20-30min, add other leftover materials after completion of dropwise addition after hybrid reaction 40-50min, after mixing dispersion 2-3h, namely obtain this water based paint.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610273343.4A CN105750483A (en) | 2016-04-27 | 2016-04-27 | Antioxidant water-based lost foam casting coating for magnesium alloy casting and preparation method thereof |
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| CN201610273343.4A CN105750483A (en) | 2016-04-27 | 2016-04-27 | Antioxidant water-based lost foam casting coating for magnesium alloy casting and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106141076A (en) * | 2016-08-30 | 2016-11-23 | 阜阳市富鑫铸造机械有限公司 | A kind of nonferrous metal lost foam casting isopropyl alcohol-base paint and preparation method thereof |
| CN106141079A (en) * | 2016-08-30 | 2016-11-23 | 阜阳市富鑫铸造机械有限公司 | A kind of high intensity dispellable mould casting isopropyl alcohol-base paint and preparation method thereof |
| CN108655332A (en) * | 2017-03-29 | 2018-10-16 | 宁夏共享模具有限公司 | A kind of water-based dip applicating paint and preparation method thereof for 3D printing sand mold |
| CN112247066A (en) * | 2020-10-23 | 2021-01-22 | 湖南塑源特科技有限公司 | Quick-drying water-based lost foam casting coating and preparation method thereof |
| CN113894251A (en) * | 2021-12-13 | 2022-01-07 | 河北钢研德凯科技有限公司 | High-inertia mould shell for casting, preparation method thereof and method for improving magnesium alloy casting precision |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106141076A (en) * | 2016-08-30 | 2016-11-23 | 阜阳市富鑫铸造机械有限公司 | A kind of nonferrous metal lost foam casting isopropyl alcohol-base paint and preparation method thereof |
| CN106141079A (en) * | 2016-08-30 | 2016-11-23 | 阜阳市富鑫铸造机械有限公司 | A kind of high intensity dispellable mould casting isopropyl alcohol-base paint and preparation method thereof |
| CN108655332A (en) * | 2017-03-29 | 2018-10-16 | 宁夏共享模具有限公司 | A kind of water-based dip applicating paint and preparation method thereof for 3D printing sand mold |
| CN108655332B (en) * | 2017-03-29 | 2019-12-20 | 共享智能装备有限公司 | Water-based dip-coating paint for 3D printing sand mold and preparation method thereof |
| CN112247066A (en) * | 2020-10-23 | 2021-01-22 | 湖南塑源特科技有限公司 | Quick-drying water-based lost foam casting coating and preparation method thereof |
| CN113894251A (en) * | 2021-12-13 | 2022-01-07 | 河北钢研德凯科技有限公司 | High-inertia mould shell for casting, preparation method thereof and method for improving magnesium alloy casting precision |
| CN113894251B (en) * | 2021-12-13 | 2022-02-22 | 河北钢研德凯科技有限公司 | High-inertia mould shell for casting, preparation method thereof and method for improving magnesium alloy casting precision |
| WO2023109101A1 (en) * | 2021-12-13 | 2023-06-22 | 河北钢研德凯科技有限公司 | Highly-inert mold shell for casting, preparation method therefor, and method for improving precision of magnesium alloy casting |
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Application publication date: 20160713 |