CN104249130A - Coating capable of improving thickness of graphite layer on inner surface of precision casting and preparation process of coating - Google Patents
Coating capable of improving thickness of graphite layer on inner surface of precision casting and preparation process of coating Download PDFInfo
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- CN104249130A CN104249130A CN201410493153.4A CN201410493153A CN104249130A CN 104249130 A CN104249130 A CN 104249130A CN 201410493153 A CN201410493153 A CN 201410493153A CN 104249130 A CN104249130 A CN 104249130A
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Abstract
The invention discloses a coating capable of improving the thickness of a graphite layer on the inner surface of a precision casting. The coating comprises an organic solvent and a solute, wherein the organic solvent is ethyl alcohol, and the solute comprises 60-65 parts of bauxite, 3-6 parts of electrolytic cerium, 1-3 parts of sodium bentonite, 3-7 parts of graphite and 1-1.5 parts of a dispersing agent. The baume degree of the coating is 62-68. According to the invention, 200-300-mesh bauxite, graphite, sodium bentonite and electrolytic cerium are adopted, and the active electrolytic cerium is added in a refractory material, so that a matrix can have good high-temperature strength and stability. The electrolytic cerium can promote the ductile progress of high-nickel austenitic nodular cast iron and reduces the formation of layered graphite layers. The coating is simple in formula, practical, simple and convenient in preparation process and full in effect and is worthy of application and promotion.
Description
Technical field
The invention belongs to casting auxiliary material technical field, be specifically related to a kind of coating and the preparation technology thereof that improve precision casting inner surface graphite linings thickness.
Background technology
Form in High Nickel Austenite Nodular Cast Iron is due to its good heat resistance and corrosion resistance, increasing application is obtained in automobile exhaust pipe manufacturer, but due to the solidification mode that it is special, make the crystallization condition of its inner surface cooling procedure different from outside, it has the structure and properties different from inside, endosexine is made to occur flake graphite defect, especially complicated pipe fitting foundry goods, have a strong impact on the quality of foundry goods, its product percent of pass is caused to reduce, hydraulic performance decline, and this defect has more present pipe fitting runner intersection or tube wall thickness changes obvious thermal center place, surface is made to produce the graphite linings being up to 0.8 ㎜, have a strong impact on the quality of product, in order to avoid the generation of this type of situation in actual production, often adopt to be coated with on core or inner core and coat, make it can form layer protective layer to prevent the generation reducing graphite linings, but the inner core of the precoated sand adopting coating additive that foundry goods is used, because of the H produced after iron liquid parcel and heating, O.N gas, because H.N gas hinders graphite element, consume the nodularization element that foundry goods inner surface and inner core connect principal surface, the inner surface of foundry goods is made to create abnormal nodularizing, there is flake graphite and lopsided graphite.
A kind of sand casting alcohol-base paint and preparation method thereof has been suffered at CN 102873267 A.The density of this coating is 1200-1400kg/m3, is made up of solute and organic solvent; Organic solvent is selected from one or more mixing in methyl alcohol, ethanol, isopropyl alcohol; Solute comprises the component of following weight percentage: bauxite 60-75%, attapulgite 1-5%, sodium bentonite 0.5-1.5%, amorphous graphite 2-10%, flake graphite 3-15%, iron oxide red 2-10%, polyvinyl butyral resin 1-5%, surfactant 0.1-0.5%, dispersant 0.1-0.5%, hydrochloric acid solution 1-5%; But the improvement of ductile Ni-resist cast iron foundry goods graphite linings can not be applicable to, therefore need a kind of coating that ductile Ni-resist cast iron graphite linings can be maximized process.
Summary of the invention
The present invention is to make up the deficiencies in the prior art, provides a kind of easy and simple to handle and significantly can reduce the coating of graphite linings thickness.
Technical scheme adopted to achieve these goals: a kind of coating improving precision casting inner surface graphite linings thickness, described coating comprises organic solvent and solute, described organic solvent is ethanol, described solute comprises bauxite 60-65 part, electrolysis cerium 3-6 part, sodium bentonite 1-3 part, graphite 3-7 part, dispersant 1-1.5 part, the Baume degrees of described coating is 62-68.
Described solute comprises bauxite 60 parts, electrolysis cerium 5 parts, sodium bentonite 2 parts, 5 parts, graphite, dispersant 1 part, and the Baume degrees of described coating is 65.
The granularity of described bauxite, electrolysis cerium, sodium bentonite, graphite is 200-300 order.
Improve a preparation technology for the coating of precision casting inner surface graphite linings thickness, comprise the following steps: a, add bauxite, graphite and dispersant in organic solvent and then stir;
B, the electrolysis cerium adding 3-6 part stir;
C, add the sodium bentonite of 1-3 part, stir 40-50 minute, namely obtain described coating.
Of the present invention possess following advantage:
1. the present invention adopts 200-300 object bauxite, graphite, sodium bentonite and electrolysis cerium, it adds active electrolysis cerium in refractory material, make matrix can possess good elevated temperature strength and stability, and electrolysis cerium can promote that Form in High Nickel Austenite Nodular Cast Iron spheroidal graphiteization is in progress, reduce the formation of stratiform graphite linings.
2. in the end adding sodium bentonite makes the solute in the present invention to disperse in organic solvent uniformly, makes can not precipitate in pulping process, causes the phenomenon of skewness, improve stability and the brushability of coating.
3. formulation for coating material of the present invention is simple and practical, and manufacture craft is easy and effect abundant, is worth application and promotes.
detailed description of the invention:
Embodiment one: a kind of coating improving precision casting inner surface graphite linings thickness, described coating comprises organic solvent and solute, and described organic solvent is ethanol, described solute comprises bauxite 60 parts, electrolysis cerium 3 parts, sodium bentonite 1 part, 3 parts, graphite, dispersant 1 part;
The granularity of described bauxite, electrolysis cerium, sodium bentonite, graphite is 200 orders.
Improve a preparation technology for the coating of precision casting inner surface graphite linings thickness, comprise the following steps: a, add bauxite, graphite and dispersant in organic solvent and then stir;
B, the electrolysis cerium adding 3 parts stir;
C, add the sodium bentonite of 1 part, stir 45 minutes, namely obtain described coating, Baume degrees is 60.
Embodiment two:
Improve a coating for precision casting inner surface graphite linings thickness, described coating comprises organic solvent and solute, and described organic solvent is ethanol, and described solute comprises bauxite 62 parts, electrolysis cerium 5 parts, sodium bentonite 2 parts, 5 parts, graphite, dispersant 1.3 parts.
The granularity of described bauxite, electrolysis cerium, sodium bentonite, graphite is 200 orders.
Improve a preparation technology for the coating of precision casting inner surface graphite linings thickness, comprise the following steps: a, add bauxite, graphite and dispersant in organic solvent and then stir;
B, the electrolysis cerium adding 5 parts stir;
C, add the sodium bentonite of 2 parts, stir 40 minutes, namely obtain described coating, Baume degrees is 62.
Embodiment three: a kind of coating improving precision casting inner surface graphite linings thickness, described coating comprises organic solvent and solute, and described organic solvent is ethanol, described solute comprises bauxite 65 parts, electrolysis cerium 6 parts, sodium bentonite 3 parts, 7 parts, graphite, dispersant 1.5 parts.
The granularity of described bauxite, electrolysis cerium, sodium bentonite, graphite is 290 orders.
Improve a preparation technology for the coating of precision casting inner surface graphite linings thickness, comprise the following steps: a, add bauxite, graphite and dispersant in organic solvent and then stir;
B, the electrolysis cerium adding 6 parts stir;
C, add the sodium bentonite of 3 parts, stir 50 minutes, namely obtain described coating, the Baume degrees of acquisition is 61.
Embodiment four: a kind of coating improving precision casting inner surface graphite linings thickness, described coating comprises organic solvent and solute, and described organic solvent is ethanol, described solute comprises bauxite 60 parts, electrolysis cerium 5 parts, sodium bentonite 2 parts, 5 parts, graphite, dispersant 1 part
The granularity of described bauxite, electrolysis cerium, sodium bentonite, graphite is 300 orders.
Improve a preparation technology for the coating of precision casting inner surface graphite linings thickness, comprise the following steps: a, add bauxite, graphite and dispersant in organic solvent and then stir;
B, the electrolysis cerium adding 5 parts stir;
C, add the sodium bentonite of 2 parts, stir 48 minutes, namely obtain described coating, the Baume degrees of described coating is 65.
Embodiment five: a kind of coating improving precision casting inner surface graphite linings thickness, described coating comprises organic solvent and solute, and described organic solvent is ethanol, described solute comprises bauxite 65 parts, electrolysis cerium 6 parts, sodium bentonite 2.5 parts, 7 parts, graphite, dispersant 1.3 parts
The granularity of described bauxite, electrolysis cerium, sodium bentonite, graphite is 240 orders.
Improve a preparation technology for the coating of precision casting inner surface graphite linings thickness, comprise the following steps: a, add bauxite, graphite and dispersant in organic solvent and then stir;
B, the electrolysis cerium adding 6 parts stir;
C, add the sodium bentonite of 2.5 parts, stir 50 minutes, namely obtain described coating, the Baume degrees of described coating is 68.
The coating test result characteristic that embodiment 1-5 obtains is as shown in the table:
| ? | Suspension stability (24 hours suspensions) | Equadag coating (thickness is millimeter) |
| Embodiment 1 | 98% | 0.01 |
| Embodiment 2 | 95% | 0.05 |
| Embodiment 3 | 97% | 0.02 |
| Embodiment 4 | 96% | 0.09 |
| Embodiment 5 | 98% | 0.07 |
Splendid and equadag coating thickness very thin obtained of suspension stability of the present invention as can be seen from the above table, make the graphite linings that originally can arrive 0.5 ㎜, be reduced to 0.1 below ㎜, and the sidewall thickness originally producing graphite linings place is about 5 ㎜, before not adopting this coating, actual wall thickness is about 4 ㎜, adopt actual (real) thickness after the present invention to be then 4.8 more than ㎜, improve the quality of product, extend service life.
In use by uniform for the present invention dipping thermal center place and the corner being with pit, then light, for subsequent use after the drying.
Of the present invention possess following advantage:
1. the present invention adopts 200-300 object bauxite, graphite, sodium bentonite and electrolysis cerium, it adds active electrolysis cerium in refractory material, make matrix can possess good elevated temperature strength and stability, and electrolysis cerium can promote that Form in High Nickel Austenite Nodular Cast Iron spheroidal graphiteization is in progress, reduce the formation of stratiform graphite linings.
2. in the end adding sodium bentonite makes the solute in the present invention to disperse in organic solvent uniformly, makes can not precipitate in pulping process, causes the phenomenon of skewness, improve stability and the brushability of coating.
3. formulation for coating material of the present invention is simple and practical, and manufacture craft is easy and effect abundant, is worth application and promotes.
Claims (4)
1. one kind is improved the coating of precision casting inner surface graphite linings thickness, it is characterized in that: described coating comprises organic solvent and solute, described organic solvent is ethanol, described solute comprises bauxite 60-65 part, electrolysis cerium 3-6 part, sodium bentonite 1-3 part, graphite 3-7 part, dispersant 1-1.5 part, the Baume degrees of described coating is 62-68.
2. improve the coating of precision casting inner surface graphite linings thickness as claimed in claim 1, it is characterized in that: described solute comprises bauxite 60 parts, electrolysis cerium 5 parts, sodium bentonite 2 parts, 5 parts, graphite, dispersant 1 part, the Baume degrees of described coating is 65.
3. improve the coating of precision casting inner surface graphite linings thickness as claimed in claim 1, it is characterized in that: the granularity of described bauxite, electrolysis cerium, sodium bentonite, graphite is 200-300 order.
4. improve a preparation technology for the coating of precision casting inner surface graphite linings thickness, it is characterized in that: comprise the following steps:
A, add bauxite, graphite and dispersant in organic solvent and then stir;
B, the electrolysis cerium adding 3-6 part stir;
C, add the sodium bentonite of 1-3 part, stir 40-50 minute, namely obtain described coating.
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| CN201410493153.4A CN104249130B (en) | 2014-09-24 | 2014-09-24 | A kind of coating and preparation technology thereof improving precision casting inner surface graphite linings thickness |
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| CN201410493153.4A CN104249130B (en) | 2014-09-24 | 2014-09-24 | A kind of coating and preparation technology thereof improving precision casting inner surface graphite linings thickness |
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| CN104249130A true CN104249130A (en) | 2014-12-31 |
| CN104249130B CN104249130B (en) | 2016-01-27 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105344922A (en) * | 2015-10-26 | 2016-02-24 | 无锡市永亿精密铸造有限公司 | Primary layer coating for airplane blade precise coating |
| CN112059105A (en) * | 2020-09-18 | 2020-12-11 | 纪汉成 | Coating and method for thoroughly eliminating defects of reaction layer on surface of ductile iron piece |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5994550A (en) * | 1982-11-19 | 1984-05-31 | Kawasaki Steel Corp | Method for preventing deterioration in graphite texture in surface layer of casting of spherioidal graphite cast iron |
| CN101602088A (en) * | 2009-07-13 | 2009-12-16 | 西安建筑科技大学 | A kind of preparation method of iron casting coating by flyash |
| CN102000762A (en) * | 2010-11-08 | 2011-04-06 | 上海市机械制造工艺研究所有限公司 | Combined coating layer process for large-scale steel casting water glass sand molds |
| CN102873266A (en) * | 2012-10-19 | 2013-01-16 | 南京信息工程大学 | Alcohol-group dry powder sand mould foundry coating |
| CN102873267A (en) * | 2012-10-19 | 2013-01-16 | 南京信息工程大学 | Alcohol-based paint for sand casting and preparation method thereof |
| CN103056290A (en) * | 2013-01-25 | 2013-04-24 | 南京信息工程大学 | Heat-resisting cast iron casting coating and preparation method thereof |
-
2014
- 2014-09-24 CN CN201410493153.4A patent/CN104249130B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5994550A (en) * | 1982-11-19 | 1984-05-31 | Kawasaki Steel Corp | Method for preventing deterioration in graphite texture in surface layer of casting of spherioidal graphite cast iron |
| CN101602088A (en) * | 2009-07-13 | 2009-12-16 | 西安建筑科技大学 | A kind of preparation method of iron casting coating by flyash |
| CN102000762A (en) * | 2010-11-08 | 2011-04-06 | 上海市机械制造工艺研究所有限公司 | Combined coating layer process for large-scale steel casting water glass sand molds |
| CN102873266A (en) * | 2012-10-19 | 2013-01-16 | 南京信息工程大学 | Alcohol-group dry powder sand mould foundry coating |
| CN102873267A (en) * | 2012-10-19 | 2013-01-16 | 南京信息工程大学 | Alcohol-based paint for sand casting and preparation method thereof |
| CN103056290A (en) * | 2013-01-25 | 2013-04-24 | 南京信息工程大学 | Heat-resisting cast iron casting coating and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105344922A (en) * | 2015-10-26 | 2016-02-24 | 无锡市永亿精密铸造有限公司 | Primary layer coating for airplane blade precise coating |
| CN112059105A (en) * | 2020-09-18 | 2020-12-11 | 纪汉成 | Coating and method for thoroughly eliminating defects of reaction layer on surface of ductile iron piece |
| CN112059105B (en) * | 2020-09-18 | 2021-03-30 | 纪汉成 | Coating for thoroughly eliminating defects of reaction layer on surface of ductile iron piece |
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| CN104249130B (en) | 2016-01-27 |
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Effective date of registration: 20151216 Address after: Nanyang City, Henan province 474550 Xixia County Private eco industrial park (enter Zhen Shi Mei Long Cun) Applicant after: XIXIA COUNTY XIBENG SPECIAL FOUNDRY CO.,LTD. Address before: 474550 Industrial Zone, East Ring Road, Xixia County, Nanyang, Henan Applicant before: Henan Province Xixia Automobile Water Pump Co.,Ltd. |
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Address after: 474550 private Ecological Industrial Park, Xixia County, Nanyang City, Henan Province (HUICHE Town, Shiti Village) Patentee after: Xixia Feilong Special Casting Co.,Ltd. Address before: 474550 private Ecological Industrial Park, Xixia County, Nanyang City, Henan Province (HUICHE Town, Shiti Village) Patentee before: XIXIA COUNTY XIBENG SPECIAL FOUNDRY CO.,LTD. |
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