CN103706757A - Magnesium alloy evaporative pattern casting coating and preparation method thereof - Google Patents
Magnesium alloy evaporative pattern casting coating and preparation method thereof Download PDFInfo
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- CN103706757A CN103706757A CN201310727810.2A CN201310727810A CN103706757A CN 103706757 A CN103706757 A CN 103706757A CN 201310727810 A CN201310727810 A CN 201310727810A CN 103706757 A CN103706757 A CN 103706757A
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Abstract
The invention relates to a magnesium alloy evaporative pattern casting coating and a preparation method thereof. The coating comprises the following components in percentage by mass: 30-50% of aluminum oxide powder, 2-8% of diatomite, 0.5-3% of polyvinyl alcohol, 0.2-1.0% of sodium carboxymethylcellulose, 2-6% of aluminum dihydrogen phosphate, 2-6% of a white emulsion, 0.5-2% of sodium dodecyl sulfate, 1-3% of boric acid, 0.01-0.03% of normal butanol and the balance of water. The coating provided by the invention has the beneficial effects that (1) the coating is free from harmful substances and does not cause the environmental pollution; (2) the coating not only has good flame retardance and heat insulation, but also has a relatively good process performance; (3) a magnesium alloy casting which is clear in contour and smooth in surface can be obtained by using the coating.
Description
Technical field
The present invention relates to a kind of lost foam casting coating, relate in particular to a kind of magnesium alloy evaporative-pattern casting coating and preparation method thereof, belong to metallurgy and Material Field.
Background technology
It is little that magnesium alloy has density, specific strength, specific stiffness are high, and damping shock absorption, machinability, thermal conductivity are good, and electromagnetic shielding ability is strong, be easy to the advantages such as recovery, in fields such as Aeronautics and Astronautics, traffic, communication, electronics and defence and militaries, there is very wide application prospect.
Lost foam casting is the novel casting technology of a kind of Near net shape, Accurate Shaping, cleaner production, is applicable to very much magnesium alloy cast and is shaped.Because the chemical property of magnesium is very active, very easily oxidizing fire, causes cast(ing) surface to occur hole or oxidation elephant skin defect, when serious, foundry goods is scrapped; The thermal capacity of magnesium is little, and cooling velocity is too fast, causes the mold-filling capacity of liquid magnesium alloy poor, and foundry goods easily produces misrun defect.Therefore, prevent that the oxidizing fire of magnesium alloy in casting process and the mold-filling capacity of raising liquid magnesium alloy from being one of key technology obtaining high-quality Mg alloy castings.Coating technology is one of core technology of lost foam casting, and the performance of magnesium alloy evaporative-pattern casting coating is most important to the quality of Mg alloy castings, and the research of magnesium alloy evaporative-pattern casting coating is relatively less at present.
Chinese patent CN1381321A discloses a kind of flame-retarding paint for casting Mg-alloy and preparation method thereof, it selects magnesia powder, pearl essence, mica powder as refractory aggregate, selecting Ludox, white glue with vinyl, polyacrylamide, sodium carboxymethylcellulose is binding agent, selecting attapulgite clay, palygorskite clay is adsorbent, selects NH
4bF
4, KBF
4, sodium alkyl sulfonate, boric acid and sulphur is fire retardant.The mass percent of each component of coating is: magnesia powder 30～50%, pearl essence 20～40%, mica powder 15～30%, Ludox 3～9%, white glue with vinyl 1～5%, polyacrylamide 0.1～0.8%, sodium carboxymethylcellulose 0.1～0.8%, adsorbent 1～6%, fire retardant 0.3～2%, surplus is water.This technology is too much paid close attention to the anti-flammability of coating, causes the processing performance of coating undesirable, and its fire retardant selected fluorine additives and sulphur, and fluorine additives and sulphur can produce a large amount of fluoride gas and SO in casting process
2gas, these pernicious gas contaminated environment, grievous injury people's is healthy, corrosion factory building.
Summary of the invention
The object of the invention is to for prior art not enough, a kind of magnesium alloy evaporative-pattern casting coating and preparation method thereof is provided, make coating both there is good anti-flammability, heat insulating ability and slag absorbing ability, there is again good wellability, brushability, gas permeability and intensity, to obtain the magnesium alloy evaporative-pattern die casting of clear-cut, any surface finish.
For realizing above-mentioned target, the technical scheme that the present invention takes comprises the steps:
A kind of magnesium alloy evaporative-pattern casting coating of the present invention, the mass percent that it is characterized in that each component is: alumina powder 35～50%, diatomite 2～8%, polyvinyl alcohol 0.5～3%, sodium carboxymethylcellulose 0.2～1.0%, aluminium dihydrogen phosphate 2～6%, white glue with vinyl 2～6%, dodecyl sodium sulfate 0.5～2%, boric acid 1～3%, n-butanol 0.01～0.03%, surplus is water.
The granularity of alumina powder of the present invention is 200～320 orders.
The preparation method of magnesium alloy evaporative-pattern casting coating of the present invention is: by 10～20 parts of polyvinyl alcohol heating waters, stir 0.5～1h, make A solution; By 10～20 parts of sodium carboxymethylcellulose heating waters, stir 0.5～1h, make B solution; Alumina powder, diatomite are put into ball mill and are dry mixed 1～2h, then add aluminium dihydrogen phosphate respectively, white glue with vinyl, dodecyl sodium sulfate, boric acid, n-butanol, A solution, B solution and suitable quantity of water are milled 2～3h.
While using coating of the present invention, can adopt brushing, dip-coating or flow coat method, on foam plastics mould surface, being coated with thick layer is 0.6～1.2mm coating, and after natural drying, being placed on temperature is to dry 2～8 hours in 45～60 ℃ of environment.
Beneficial effect of the present invention is: unharmful substance in (1) coating of the present invention, and free from environmental pollution; (2) the existing good anti-flammability of coating of the present invention and heat insulating ability, have again good processing performance; (3) use coating of the present invention can obtain the Mg alloy castings of clear-cut, any surface finish.
The specific embodiment
Embodiment 1:
A magnesium alloy evaporative-pattern casting coating, is characterized in that the mass percent of this each component of coating is: alumina powder 42%, diatomite 5%, polyvinyl alcohol 1.5%, sodium carboxymethylcellulose 0.6%, aluminium dihydrogen phosphate 4%, white glue with vinyl 4%, dodecyl sodium sulfate 1.2%, boric acid 2%, n-butanol 0.02%, surplus is water, preparation method is: by 15 parts of polyvinyl alcohol heating waters, stir 0.75h, make A solution; By 15 parts of sodium carboxymethylcellulose heating waters, stir 0.75h, make B solution; Alumina powder, diatomite are put into ball mill and are dry mixed 1.5h, then add aluminium dihydrogen phosphate respectively, white glue with vinyl, dodecyl sodium sulfate, boric acid, n-butanol, A solution, B solution and suitable quantity of water are milled 2.5h.
Embodiment 2:
A kind of magnesium alloy evaporative-pattern casting coating, the mass percent that it is characterized in that this each component of coating is: alumina powder 35%, diatomite 2%, polyvinyl alcohol 0.5%, sodium carboxymethylcellulose 0.2%, aluminium dihydrogen phosphate 2%, white glue with vinyl 2%, dodecyl sodium sulfate 0.5%, boric acid 1%, n-butanol 0.01%, surplus is water; Preparation method is by 10 parts of polyvinyl alcohol heating waters, stirs 0.5h, makes A solution; By 10 parts of sodium carboxymethylcellulose heating waters, stir 0.5h, make B solution; Alumina powder, diatomite are put into ball mill and are dry mixed 1h, then add aluminium dihydrogen phosphate respectively, white glue with vinyl, dodecyl sodium sulfate, boric acid, n-butanol, A solution, B solution and suitable quantity of water are milled 2h.
Embodiment 3:
A magnesium alloy evaporative-pattern casting coating, is characterized in that the mass percent of this each component of coating is: alumina powder 50%, diatomite 8%, polyvinyl alcohol 3%, sodium carboxymethylcellulose 1.0%, aluminium dihydrogen phosphate 6%, white glue with vinyl 6%, dodecyl sodium sulfate 2%, boric acid 3%, n-butanol 0.03%, surplus is water, preparation method is by 20 parts of polyvinyl alcohol heating waters, stirs 1h, makes A solution; By 20 parts of sodium carboxymethylcellulose heating waters, stir 1h, make B solution; Alumina powder, diatomite are put into ball mill and are dry mixed 2h, then add aluminium dihydrogen phosphate respectively, white glue with vinyl, dodecyl sodium sulfate, boric acid, n-butanol, A solution, B solution and suitable quantity of water are milled 3h.
Claims (3)
1. a magnesium alloy evaporative-pattern casting coating, the mass percent that it is characterized in that this each component of coating is: alumina powder 35～50%, diatomite 2～8%, polyvinyl alcohol 0.5～3%, sodium carboxymethylcellulose 0.2～1.0%, aluminium dihydrogen phosphate 2～6%, white glue with vinyl 2～6%, dodecyl sodium sulfate 0.5～2%, boric acid 1～3%, n-butanol 0.01～0.03%, surplus is water.
2. a kind of magnesium alloy evaporative-pattern casting coating according to claim 1, the granularity that it is characterized in that described alumina powder is 200～320 orders.
3. a preparation method for magnesium alloy evaporative-pattern casting coating according to claim 1, is characterized in that 10～20 parts of polyvinyl alcohol heating waters, stirs 0.5～1h, makes A solution; By 10～20 parts of sodium carboxymethylcellulose heating waters, stir 0.5～1h, make B solution; Alumina powder, diatomite are put into ball mill and are dry mixed 1～2h, then add aluminium dihydrogen phosphate respectively, white glue with vinyl, dodecyl sodium sulfate, boric acid, n-butanol, A solution, B solution and suitable quantity of water are milled 2～3h.
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| CN201310727810.2A CN103706757B (en) | 2013-12-26 | 2013-12-26 | Magnesium alloy evaporative pattern casting coating and preparation method thereof |
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| CN201310727810.2A CN103706757B (en) | 2013-12-26 | 2013-12-26 | Magnesium alloy evaporative pattern casting coating and preparation method thereof |
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| CN103706757A true CN103706757A (en) | 2014-04-09 |
| CN103706757B CN103706757B (en) | 2015-07-08 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105728640A (en) * | 2016-04-27 | 2016-07-06 | 霍邱县鑫瑞金属制品有限责任公司 | High-strength and high-toughness water-based lost foam coating for magnesium alloy casting and preparation method thereof |
| CN105750485A (en) * | 2016-04-27 | 2016-07-13 | 霍邱县鑫瑞金属制品有限责任公司 | Water-based lost foam casting coating with porous zeolite modified by titania film for magnesium alloy casting and preparation method thereof |
| CN105750488A (en) * | 2016-04-27 | 2016-07-13 | 霍邱县鑫瑞金属制品有限责任公司 | Water-based lost foam casting coating with aramid pulp for magnesium alloy casting and preparation method thereof |
| CN105750487A (en) * | 2016-04-27 | 2016-07-13 | 霍邱县鑫瑞金属制品有限责任公司 | Water-based lost foam casting coating with aquadag for magnesium alloy casting and preparation method thereof |
| CN105772624A (en) * | 2016-04-27 | 2016-07-20 | 霍邱县鑫瑞金属制品有限责任公司 | Glass-powder-contained high-breathability water-base expendable pattern casting coating for magnesium alloy casting and preparing method for glass-powder-contained high-breathability water-base expendable pattern casting coating for magnesium alloy casting |
| CN105964899A (en) * | 2016-07-20 | 2016-09-28 | 张耀忠 | Water-based casting coating |
| 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 |
| KR20210035774A (en) * | 2019-09-20 | 2021-04-01 | 콘풍 매테리얼스 인터네셔널 컴퍼니 리미티드 | High-purity aluminum smelting and casting coating material and its manufacturing method and use |
| CN113121250A (en) * | 2021-05-08 | 2021-07-16 | 丁威 | Preparation method of nano coating laminar flow steel brick |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105728640A (en) * | 2016-04-27 | 2016-07-06 | 霍邱县鑫瑞金属制品有限责任公司 | High-strength and high-toughness water-based lost foam coating for magnesium alloy casting and preparation method thereof |
| CN105750485A (en) * | 2016-04-27 | 2016-07-13 | 霍邱县鑫瑞金属制品有限责任公司 | Water-based lost foam casting coating with porous zeolite modified by titania film for magnesium alloy casting and preparation method thereof |
| CN105750488A (en) * | 2016-04-27 | 2016-07-13 | 霍邱县鑫瑞金属制品有限责任公司 | Water-based lost foam casting coating with aramid pulp for magnesium alloy casting and preparation method thereof |
| CN105750487A (en) * | 2016-04-27 | 2016-07-13 | 霍邱县鑫瑞金属制品有限责任公司 | Water-based lost foam casting coating with aquadag for magnesium alloy casting and preparation method thereof |
| CN105772624A (en) * | 2016-04-27 | 2016-07-20 | 霍邱县鑫瑞金属制品有限责任公司 | Glass-powder-contained high-breathability water-base expendable pattern casting coating for magnesium alloy casting and preparing method for glass-powder-contained high-breathability water-base expendable pattern casting coating for magnesium alloy casting |
| 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 |
| CN105964899A (en) * | 2016-07-20 | 2016-09-28 | 张耀忠 | Water-based casting coating |
| KR20210035774A (en) * | 2019-09-20 | 2021-04-01 | 콘풍 매테리얼스 인터네셔널 컴퍼니 리미티드 | High-purity aluminum smelting and casting coating material and its manufacturing method and use |
| KR102492076B1 (en) | 2019-09-20 | 2023-01-27 | 콘풍 매테리얼스 인터네셔널 컴퍼니 리미티드 | Coating material for high-purity aluminum smelting casting and its manufacturing method and use |
| CN113121250A (en) * | 2021-05-08 | 2021-07-16 | 丁威 | Preparation method of nano coating laminar flow steel brick |
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| CN103706757B (en) | 2015-07-08 |
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