CN1018338B - Magnesite cast steel coating - Google Patents
Magnesite cast steel coatingInfo
- Publication number
- CN1018338B CN1018338B CN 90105575 CN90105575A CN1018338B CN 1018338 B CN1018338 B CN 1018338B CN 90105575 CN90105575 CN 90105575 CN 90105575 A CN90105575 A CN 90105575A CN 1018338 B CN1018338 B CN 1018338B
- Authority
- CN
- China
- Prior art keywords
- paint
- steel
- casting
- coating
- sand
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Ceramic Products (AREA)
Abstract
The present invention relates to magnesite cast steel paint for sand molds and mold cores, which is used for casting carbon steel and alloy steel and particularly to for casting high manganese steel. Compared with the prior art, the present invention is mainly characterized in that magnesium chloride and barium chloride are added in the paint; on one hand, a paint layer forms a sand fusion layer which can be easily stripped after high-temperature casting; simultaneously, the intensity of the paint layer can be greatly improved; accordingly, the resistant ability of the paint layer to the flushing and the penetration of molten steel is improved, the sand fusion resisting function of the paint layer is enhanced, and accordingly, castings with smooth surfaces can be obtained. When a casting mold using the paint is used, a sintered paint layer can be easily stripped after casting; the surfaces of the castings are smooth, the sand fusion defective index is reduced to 3/1000, and the economic benefit is outstanding.
Description
The present invention relates to a kind of carbon steel and steel alloy, particularly the sand mold of potassium steel cast and the magnesite cast steel coating of core.Belong to the machine casting technology.
The steel moulder's paint that present domestic casting industry adopts has zircon flour coating, bauxite paints and magnesia coating etc.1, zircon flour coating mainly is to cost an arm and a leg and radioactivity is arranged; 2, bauxite paints mainly is a poor permeability, and coating and sand mold bond strength are low, so at high temperature anti-molten steel scouring is relatively poor, when being used for the quartz sand Modeling Material simultaneously, the anxious hot crack resistance of high temperature is poor, can not get good anti-stick sand effect.3, magnesite cast steel coating because magnesia linear expansivity wherein is bigger, makes the easy crackle of coating and flakes, thereby reduced coating and sand mold bond strength, thereby be difficult to bear washing away and infiltrating of high-temperature molten steel when mould drying; Simultaneously, because magnesite cast steel coating is after high temperature cast, coating can not form the comparatively ideal viscosity sand layer of easily peeling off, and therefore is difficult to obtain the foundry goods of any surface finish.
The objective of the invention is to overcome above-mentioned defective, make and a kind ofly easily peel off, suspension is good, and anti-stick sand is effective, can obtain the magnesite cast steel coating of the little foundry goods of surface roughness.
Characteristics of the present invention: be to add two kinds of alkaline-earth halides in existing magnesite cast steel coating, promptly magnesium chloride and barium chloride in order to regulate the coating sintering, form it and easily peel off viscosity sand layer.Simultaneously, the intensity of dope layer is heightened, thereby improve the resistivity of washing away and infiltrating of dope layer molten steel.
Concrete prescription of the present invention: with the magnesia powder is refractory material, the suspension with waterglass, syrup, activated bentonite, magnesium chloride and barium chloride and water composition of joining, and its weight proportion is as follows:
100 parts of magnesia powders
0.4～5 part of waterglass
1～3 part in syrup
1～3 part of activated bentonite
0.3～4 part in magnesium chloride
0.3～4 part of barium chloride
Water is an amount of
Preparing process of the present invention: according to above-mentioned component weight proportion, magnesia powder, activated bentonite and two kinds of alkaline-earth halides are placed dried mixing in the edge runner, add waterglass and syrup then and carry out mixed grind a period of time.Add water-powered roller at last to pasty state, promptly be its proportion of suspension and be 1.65～1.75 and get final product.
Magnesia powder among the present invention, its main component are that the fusing point of MgO, pure MgO is 2800 ℃, though contain SiO
2, CaO, Fe
2O
3Deng impurity, fusing point is decreased, but still greater than 1900 ℃, its refractoriness height; Magnesia powder belongs to basic refractory, and FeO or MnO are had good thermo-chemical stability, and waterglass and syrup are the binding agents in the coating, in order to the intensity of raising dope layer and the bond strength on dope layer and sand mold surface.In order to keep coating property stable, add a spot of activated bentonite, as the suspension stabilizer in the coating.Water is the diluent of coating, has certain viscosity and proportion to keep coating, in order to brushing.Add two kinds of alkaline-earth halide-magnesium chlorides and barium chloride among the present invention, its effect is a sintering of regulating coating, makes its formation easily peel off viscosity sand layer, thereby improves peeling off of dope layer, in order to casting cleaning.Simultaneously, magnesium chloride still is the important binding agent in the coating; Because of magnesium chloride (MgCL
2) and magnesia powder in MgO and water mutual effect generate a kind of basic salt (MgOHCL) that is called magnesia cement; Because of it has good consolidation, thereby can improve the surface strength of dope layer greatly.
The present invention after tested, the suspension measured value was more than 95% in eight hours.Measuring the high temperature crack resistance in two minutes 1200 ℃ of heating is one-level.Oven dry compression strength was 80～150Kg/cm in 200 ℃ * 2 hours
2, 800 ℃ of high temperature compression strengths are 200～300Kg/cm
2, permeability of the present invention and brushability are good, can spray, brushing or dip-coating, form coating complete, even, fine and close, that do not split, can be from doing or oven dry.After the cast, the coating of sintering is easily peeled off, and cast(ing) surface is bright and clean, and size is accurate.The present invention is applicable to carbon steel and steel alloy, particularly is applicable to the water-glass sand of potassium steel and stainless steel cast, the sand mold and the core of dry sand.
In sum, because the present invention has good anti-stick grittiness energy,, can obtain huge economic benefit so use this coating.Example: the high manganese steel lining plate of this plant produced.Do not use this coating 90 year 1～April, and the molten steel yield rate has only 63%, brings into use this coating May, to ending by the end of June, the molten steel yield rate rises to more than 80%, and the daily output increases by 50%, and material and water power consumption expense are more than 90,000 yuan than the first four months reduction 8%(saving amount of money).Use this coating, more preceding 4 months of 5～June reduced 91.8 tons of losses due to spoiled work altogether, amounted to 26.63 ten thousand yuan of the amount of money, and the amount of money of can reducing the loss reached 1,600,000 yuan in 1 year, and the scab percent defective drops to 3/1000ths.This shows that economic benefit is appreciable.
Claims (1)
1, a kind of magnesite cast steel coating, it is to be refractory material with the magnesia powder, the suspension of forming with waterglass, syrup, activated bentonite and an amount of water of joining is characterized in that being furnished with in the magnesite cast steel coating two kinds of compositions of magnesium chloride and barium chloride, and the weight proportion of its coating component is as follows:
100 parts of magnesia powders
0.4～5 part of waterglass
1～3 part in syrup
1～3 part of activated bentonite
0.3～4 part in magnesium chloride
0.3～4 part of barium chloride
Water is an amount of
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90105575 CN1018338B (en) | 1990-10-24 | 1990-10-24 | Magnesite cast steel coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90105575 CN1018338B (en) | 1990-10-24 | 1990-10-24 | Magnesite cast steel coating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1053200A CN1053200A (en) | 1991-07-24 |
| CN1018338B true CN1018338B (en) | 1992-09-23 |
Family
ID=4879387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90105575 Expired CN1018338B (en) | 1990-10-24 | 1990-10-24 | Magnesite cast steel coating |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1018338B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011115025A1 (en) * | 2011-10-07 | 2013-04-11 | Ask Chemicals Gmbh | Coating compositions for inorganic casting molds and cores containing salts and their use |
| CN103537614B (en) * | 2013-10-29 | 2015-12-30 | 成都三强轧辊股份有限公司 | A kind of large cast steel roll coating and preparation method thereof |
| CN104261789B (en) * | 2014-09-17 | 2016-03-02 | 安徽芜湖飞琪水泥制品有限公司 | Water glass refractory concrete and preparation method thereof |
| CN104190862B (en) * | 2014-09-24 | 2016-08-31 | 无锡康柏斯机械科技有限公司 | A kind of machinery cast steel processing adiabatic release coating and preparation method thereof |
| CN104525851B (en) * | 2014-12-10 | 2017-01-18 | 桂林中铸机械科技有限公司 | High-temperature, ceramic, erosion-resistant, dust-pollution-free and environment-friendly casting coating |
| CN109794581A (en) * | 2019-03-25 | 2019-05-24 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | A kind of lost foam paint suitable for the casting of continuous Thin-Section Steel Castings |
| CN112692227B (en) * | 2020-12-30 | 2022-05-17 | 刘玉满 | Reinforcer for casting coating material for preventing sand from flaky peeling and shelling and preparation and use method thereof |
-
1990
- 1990-10-24 CN CN 90105575 patent/CN1018338B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1053200A (en) | 1991-07-24 |
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Legal Events
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |