CN104646605A - Coating for cast aluminum alloy - Google Patents
Coating for cast aluminum alloy Download PDFInfo
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- CN104646605A CN104646605A CN201510097368.9A CN201510097368A CN104646605A CN 104646605 A CN104646605 A CN 104646605A CN 201510097368 A CN201510097368 A CN 201510097368A CN 104646605 A CN104646605 A CN 104646605A
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- coating
- birmasil
- attapulgite
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention belongs to the field of functional coatings and in particular relates to a coating for a cast aluminum alloy. The coating comprises the following components in percentage by weight: 30-40 percent of attapulgite, 10-20 percent of ethylene-vinyl acetate, 15-30 percent of silicon powder, 10-20 percent of abietate, 3-8 percent of carboxymethylcellulose and the balance of ethanol. The coating disclosed by the invention has the advantages that (1) the coating disclosed by the invention has high viscosity, good high-temperature crack resistance and high-temperature strength, particularly after the attapulgite subjected to silanization treatment is added, the performance of the coating is further improved; and (2) due to the selected boron nitride nanopowder, the heat-conducting property of the coating is improved, and the solidification rate of the casting is improved, so that the pores and micro cracks of the aluminum alloy castings are reduced. Furthermore, according to the added boron nitride nanopowder, the binding strength and tightness between the coating and molding sand can be improved at high temperature, and the porosity in the coating is reduced.
Description
Technical field
The invention belongs to field of functional coatings, be specifically related to a kind of Birmasil coating.
Background technology
As structural material, compared with iron and steel, it is little that aluminium alloy has density, specific strength advantages of higher, day by day increases at field consumptions such as Aeronautics and Astronautics, automobile, medicine equipments.In aluminium alloy castings production process, especially in the aluminium alloy castings manufacture process that band is porose, a large amount of hole defects can be produced near pore structure, cause aluminium alloy castings performance especially the declining to a great extent of mechanical property and sealing property, cause yield rate low, mass energy is wasted, and brings loss to production.Research for aluminium alloy Hole defect becomes the study hotspot of casting aluminum alloy already, but never effectively process is to control or to eliminate this type of hole defect.
CN103752809 A discloses a kind of method eliminating aluminium alloy castings hole defect, and specifically disclose following technical characteristic: before lower core, use hairbrush or felt-cloth evenly to brush at chill in deployed varnish, when varnish is not dry, evenly sprinkle dry sand, natural drying 10 ~ 15 minutes, makes dry sand stick on chill; Chill is placed in sand mold; Again foundry goods is poured into a mould.
CN102228979 A discloses a kind of casting method of major diameter fluid coupling aluminum alloy impeller assembly, and specifically disclose following technical characteristic: in casting mold cavity, place chill, chill first coats tung oil, sprinkle quartz sand, be positioned over appropriate location in die cavity again after oven dry, then foundry goods is poured into a mould.
In the scheme of above-mentioned prior art, varnish and tung oil all belong to common coating, and Birmasil coating should possess following performance requirement, and namely coating should have good wetability and caking property, good high-temperature resistant property and elevated temperature strength.
Summary of the invention
The present invention is directed to the deficiency of prior art existence and a kind of Birmasil coating is provided, the present invention is to chill sprayed coating, make cold ironing surface scab effective, at high temperature can not come off because of fluid scouring, thus eliminate the source of hole defect formation, and then eliminate this type of hole defect completely.
The technical scheme realizing the object of the invention is: a kind of Birmasil coating, by weight percentage, this coating comprises: attapulgite 30 ~ 40%, ethylene-vinyl acetate 10 ~ 20%, silica flour 15 ~ 30%, rosin ester 10 ~ 20%, carboxymethyl cellulose 3 ~ 8%, ethanol balance.
Preferably, Birmasil coating of the present invention, by weight percentage, this coating consists of the following composition: attapulgite 30%, ethylene-vinyl acetate 20%, silica flour 15%, rosin ester 20%, carboxymethyl cellulose 8%, ethanol balance.
Further, attapulgite of the present invention is through silanization treatment, and concrete silanization treatment step is: 1) by attapulgite and silicone oil in mass ratio for 1:3 is scattered in alcohol solvent; 2) stir 2 ~ 4 hours at bath temperature 40 ~ 60 DEG C, then evaporate to dryness at bath temperature 90 DEG C ~ 95 DEG C; 3) be transferred in Muffle furnace and carry out roasting.
More preferably, Birmasil coating of the present invention, by weight percentage, this coating also comprises: nano boron nitride powder 0.5 ~ 2%.
Coating is preferably evenly brushed on the surface of chill with hairbrush or felt-cloth by the present invention, and brushing thickness is 0.3 ~ 0.6mm.When coating is not dry, sprinkle dry sand uniformly, dry sand is sticked on chill.Described dry sand particle diameter is less than 200 orders.
The invention has the advantages that:
1) coating of the present invention possesses good viscosity, good high-temperature resistant property and elevated temperature strength, especially adds after the attapulgite of silanization treatment, further improves the performance of coating;
2) nano boron nitride powder that the present invention selects improves the heat conductivility of coating, improves the setting rate of foundry goods, thus reduces the tendency of aluminium alloy castings pore and micro-crack.Further, the nano boron nitride powder of interpolation at high temperature can improve binding strength and the tight ness rating of coating and molding sand, reduces the porosity in coating.
Detailed description of the invention
Below in conjunction with embodiment the present invention done and describe further.
A kind of Birmasil coating of the present invention, by weight percentage, this coating comprises: attapulgite 30 ~ 40%, ethylene-vinyl acetate 10 ~ 20%, silica flour 15 ~ 30%, rosin ester 10 ~ 20%, carboxymethyl cellulose 3 ~ 8%, ethanol balance.
Evenly brush on the surface of chill by obtained coating selection hairbrush or felt-cloth, brushing thickness is 0.3 ~ 0.6mm.When coating is not dry, sprinkle dry sand uniformly, dry sand is sticked on chill.The dry sand particle diameter selected is less than 200 orders.
embodiment 1
A kind of Birmasil coating, consists of the following composition: attapulgite 30%, ethylene-vinyl acetate 20%, silica flour 15%, rosin ester 20%, carboxymethyl cellulose 8%, ethanol balance.
embodiment 2
A kind of Birmasil coating, consists of the following composition: attapulgite 40%, ethylene-vinyl acetate 16%, silica flour 20%, rosin ester 15%, carboxymethyl cellulose 5%, ethanol balance.
embodiment 3
A kind of Birmasil coating, consists of the following composition: attapulgite 34%, ethylene-vinyl acetate 10%, silica flour 30%, rosin ester 10%, carboxymethyl cellulose 3%, ethanol balance.
embodiment 4
In order to improve the heat conductivility of coating, reduce the tendency of aluminium alloy castings pore and micro-crack.Birmasil coating of the present invention also comprises: nano boron nitride powder 0.5 ~ 2%.
When concrete this coating of use, preferably evenly brush with hairbrush or felt-cloth on the surface of chill by coating, brushing thickness is 0.3 ~ 0.6mm.When coating is not dry, sprinkle dry sand uniformly, dry sand is sticked on chill.Described dry sand particle diameter is less than 200 orders.
In embodiment 1-4, in order to improve the dispersive property of attapulgite, thus improve further the performance of coating, by attapulgite through silanization treatment, concrete silanization treatment step is: 1) by attapulgite and silicone oil in mass ratio for 1:3 is scattered in alcohol solvent; 2) stir 2 ~ 4 hours at bath temperature 40 ~ 60 DEG C, then evaporate to dryness at bath temperature 90 DEG C ~ 95 DEG C; 3) be transferred in Muffle furnace and carry out roasting.Roasting condition is: sintering temperature 300 ~ 450 DEG C, roasting time 3 ~ 6 hours.
Above according to desirable embodiment of the present invention for enlightenment, by above-mentioned description, related personnel in the scope not departing from this invention technological thought, can carry out various change and amendment completely.The technical scope of this invention is not limited to the content on description, must determine technical scope according to right.
Claims (7)
1. a Birmasil coating, by weight percentage, this coating comprises: attapulgite 30 ~ 40%, ethylene-vinyl acetate 10 ~ 20%, silica flour 15 ~ 30%, rosin ester 10 ~ 20%, carboxymethyl cellulose 3 ~ 8%, ethanol balance.
2. a kind of Birmasil coating according to claim 1, it is characterized in that: by weight percentage, this coating consists of the following composition: attapulgite 30%, ethylene-vinyl acetate 20%, silica flour 15%, rosin ester 20%, carboxymethyl cellulose 8%, ethanol balance.
3. a kind of Birmasil coating according to claim 1 and 2, is characterized in that: described attapulgite is through silanization treatment, and concrete silanization treatment step is: 1) by attapulgite and silicone oil in mass ratio for 1:3 is scattered in alcohol solvent; 2) stir 2 ~ 4 hours at bath temperature 40 ~ 60 DEG C, then evaporate to dryness at bath temperature 90 DEG C ~ 95 DEG C; 3) be transferred in Muffle furnace and carry out roasting.
4. a kind of Birmasil coating according to claim 1, it is characterized in that: by weight percentage, this coating also comprises: nano boron nitride powder 0.5 ~ 2%.
5. a kind of Birmasil coating according to claim 1 or 4, is characterized in that: evenly brush with hairbrush or felt-cloth on the surface of chill by coating, brushing thickness is 0.3 ~ 0.6mm.
6. a kind of Birmasil coating according to claim 5, is characterized in that: when coating is not dry, sprinkle dry sand uniformly, dry sand is sticked on chill.
7. a kind of Birmasil coating according to claim 6, is characterized in that: described dry sand particle diameter is less than 200 orders.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510097368.9A CN104646605B (en) | 2015-03-05 | 2015-03-05 | A kind of Cast aluminium alloy gold coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510097368.9A CN104646605B (en) | 2015-03-05 | 2015-03-05 | A kind of Cast aluminium alloy gold coating |
Publications (2)
| Publication Number | Publication Date |
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| CN104646605A true CN104646605A (en) | 2015-05-27 |
| CN104646605B CN104646605B (en) | 2016-07-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510097368.9A Active CN104646605B (en) | 2015-03-05 | 2015-03-05 | A kind of Cast aluminium alloy gold coating |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106111951A (en) * | 2016-06-29 | 2016-11-16 | 无锡康柏斯机械科技有限公司 | A kind of casting technique of aluminium alloy wheel hub |
| CN106391995A (en) * | 2016-04-27 | 2017-02-15 | 霍邱县鑫瑞金属制品有限责任公司 | High-thermal stability water-based EPC paint for magnesium alloy casting and preparation method thereof |
| CN107243594A (en) * | 2017-06-14 | 2017-10-13 | 合肥市旺友门窗有限公司 | A kind of used in aluminium alloy casting insulating refractory coating and preparation method thereof |
| CN108129920A (en) * | 2017-12-06 | 2018-06-08 | 安徽金达节能材料发展有限公司 | One kind is used for aluminium alloy casting metal coating |
| CN108555228A (en) * | 2017-12-06 | 2018-09-21 | 安徽金达节能材料发展有限公司 | One kind being used for aluminium alloy coating |
| CN109848364A (en) * | 2018-12-11 | 2019-06-07 | 商丘师范学院 | A kind of compression casting boron nitride coating and preparation method thereof |
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| CN1363436A (en) * | 2001-12-11 | 2002-08-14 | 上海交通大学 | Casting paint for adsorptive lost Al-alloy mould and its preparing process |
| JP2003088938A (en) * | 2001-09-14 | 2003-03-25 | Suzuki Motor Corp | Method for heightening heat resistance of casting |
| CN102357648A (en) * | 2011-10-13 | 2012-02-22 | 李华山 | Chill coating for casting |
| CN102836951A (en) * | 2012-08-31 | 2012-12-26 | 太仓科博尔精密铸业有限公司 | Aluminum alloy EPC (Expendable Pattern Casting) coating and preparation method thereof |
| CN103752809A (en) * | 2014-01-07 | 2014-04-30 | 南通宏德机电有限公司 | Method for eliminating aluminum alloy casting pore defects |
| CN104128557A (en) * | 2014-07-26 | 2014-11-05 | 宁国市大泉机械有限公司 | Aluminum alloy casting coating |
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2015
- 2015-03-05 CN CN201510097368.9A patent/CN104646605B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003088938A (en) * | 2001-09-14 | 2003-03-25 | Suzuki Motor Corp | Method for heightening heat resistance of casting |
| CN1363436A (en) * | 2001-12-11 | 2002-08-14 | 上海交通大学 | Casting paint for adsorptive lost Al-alloy mould and its preparing process |
| CN102357648A (en) * | 2011-10-13 | 2012-02-22 | 李华山 | Chill coating for casting |
| CN102836951A (en) * | 2012-08-31 | 2012-12-26 | 太仓科博尔精密铸业有限公司 | Aluminum alloy EPC (Expendable Pattern Casting) coating and preparation method thereof |
| CN103752809A (en) * | 2014-01-07 | 2014-04-30 | 南通宏德机电有限公司 | Method for eliminating aluminum alloy casting pore defects |
| CN104128557A (en) * | 2014-07-26 | 2014-11-05 | 宁国市大泉机械有限公司 | Aluminum alloy casting coating |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106391995A (en) * | 2016-04-27 | 2017-02-15 | 霍邱县鑫瑞金属制品有限责任公司 | High-thermal stability water-based EPC paint for magnesium alloy casting and preparation method thereof |
| CN106111951A (en) * | 2016-06-29 | 2016-11-16 | 无锡康柏斯机械科技有限公司 | A kind of casting technique of aluminium alloy wheel hub |
| CN107243594A (en) * | 2017-06-14 | 2017-10-13 | 合肥市旺友门窗有限公司 | A kind of used in aluminium alloy casting insulating refractory coating and preparation method thereof |
| CN108129920A (en) * | 2017-12-06 | 2018-06-08 | 安徽金达节能材料发展有限公司 | One kind is used for aluminium alloy casting metal coating |
| CN108555228A (en) * | 2017-12-06 | 2018-09-21 | 安徽金达节能材料发展有限公司 | One kind being used for aluminium alloy coating |
| CN109848364A (en) * | 2018-12-11 | 2019-06-07 | 商丘师范学院 | A kind of compression casting boron nitride coating and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104646605B (en) | 2016-07-20 |
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Effective date of registration: 20230913 Address after: No. 415 Kaiyuan Road, Fenghua District, Ningbo City, Zhejiang Province, 315500 Patentee after: Ningbo Fenghua Wansheng Aluminum Co.,Ltd. Address before: 215400 1 1 Beijing West Road, Taicang Economic Development Zone, Suzhou, Jiangsu. Patentee before: SUZHOU YUXI NEW MATERIAL TECHNOLOGY Co.,Ltd. |