CN1243050A - Metal type heat-insulation coating - Google Patents
Metal type heat-insulation coating Download PDFInfo
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- CN1243050A CN1243050A CN 99116316 CN99116316A CN1243050A CN 1243050 A CN1243050 A CN 1243050A CN 99116316 CN99116316 CN 99116316 CN 99116316 A CN99116316 A CN 99116316A CN 1243050 A CN1243050 A CN 1243050A
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- coating
- aqueous solution
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- diatomite
- mica powder
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Abstract
The present invention relates to a metal heat insulating coating which comprises (wt%) mica powder 45-65%, diatomite 15-25%, Leituoshi 5-10%, colloidal silica 10-20% and sodium salt aqueous solution 5-10%. The raw materials are ground into paste or pulp by adding water, and the paste or the pulp possesses excellent suspension and coating property, and can be matched with primer coating and surface layer heat-insulating coating, it possesses the obvious action of regulating casting cooling speed and raising the effect of riser padding, its lubricating property is good, adhesive strength is high, service life is long, it is convenient for pulling core and forming casting, and the aluminium alloy casting surface roughness can be up to Ra 3.2-12.5 micrometer.
Description
The present invention is that name is called dividing an application of " metal type coating series ", application number 94104236.7, the applyings date 940423 application for a patent for invention.
The invention belongs in the casting and molding technology mo(U)ld face coating composition and select, the thermal insulation coatings that is used among the metal mold semipermanent coating series is provided.
Metal mold belongs to the Special Processes of Metal Castings technology in the casting field, is widely used in aluminum casting production.This technological requirement has coating to be separated by between metal mold type wall and cast(ing) surface, to play the protective money genotype, to regulate casting solidification speed, is convenient to effects such as foundry goods off-type.Commercial coating series, the Dycote coating series developed of Foseco company for example be widely used in during the permanent mold casting of aluminum casting and low pressure casting produce in states such as English, U.S., methods already, but its prescription is not seen open report.In China, owing to there is not the serial marketed coating of function admirable, each producer all is that autogamy is personal, and the coating that is used to produce is at present summarized and mainly contained three classes: 1, flake asbestos thermal insulation coatings generally is used in brushing technology, though heat insulation effect is preferably arranged, but its hot brushability is bad, and tack is not strong, and working life is short, flake asbestos needs preliminary treatment, and human body is had harm; 2, zinc oxide coating generally is used in spraying coating process, because zinc oxide and waterglass effect in its prescription causes coating suspension poor, perishable inefficacy, storage period, is short, and working life is not long, its lubricity is also poor, and is complicated or be embedded with the metal mold of getting deeply stuck in iron core for external form, the open form difficulty of loosing core; 3, the graphite powder water paint is used in impregnation technology more, and this clagging is bad, and intensity is very low, poor durability.For less demanding aluminum casting, adopt above-mentioned coating still can meet the demands,, overcome the shortcoming of above-mentioned coating for special that has relatively high expectations then obvious deficiency, become factory and further improved metal mold casting quality and output, and the major technique key that enlarges its range of application.
Purpose of the present invention promptly is the shortcoming that overcomes existing chill coating; make the chill coating of processing performances such as both having good suspension, screening characteristics and durability; require this coating in the protective money genotype again; regulate casting solidification speed and be convenient to open form aspect such as loose core and be better than existing coating, have good serviceability.
For achieving the above object, need three kinds of basic coating to be used, i.e. subbing, thermal insulation coatings and top heat-conductive coating.The present invention adopts special nonmetallic materials and prescription, the thermal insulation coatings prescription that provides is by weight percentage: mica powder 45～65%, diatomite 15～25%, rectorite 5～10%, Ludox 10～20%, sodium-salt aqueous solution 5～10%, above-mentioned raw materials add water and are rolled into paste or pulpous state.
When being rolled into pulpous state, described Ludox can be alkaline silica sol, pH value 9～11, and described sodium-salt aqueous solution is Na
3PO
4Saturated aqueous solution, mica powder granularity 50～20 μ m, diatomite granularity 50～28 μ m, raw material drop into when mill is rolled in colloid mill or the ball mill, the addition of water is controlled between 15～25 seconds the viscosity of coating and (adopts the N-6 flow cup to measure), be suitable as the thermal insulation coatings of die cavity thermal insulation.
When being rolled into paste, described Ludox can be acidic silicasol, pH value 2～4, described natrium brine colloidal sol is waterglass, modulus 2.5～3.0, described mica powder granularity 100～63 μ m, diatomite granularity 80～50 μ m, raw material adopts mixer or rivet bucker to prepare, and the addition of water makes coating be paste, is suitable as riser head heat-preserving coating.
Thermal insulation coatings, subbing and top heat-conductive coating are used and can reach global optimization.
1. the thermal insulation coatings and the top heat-conductive coating of subbing and die cavity thermal insulation are supporting, to improve the durability of composite coating, make it semipermanentization.Consider the thermal physical characteristic of coating, subbing has half thermal conductivity, the thermal insulation coatings tool heat insulating function of die cavity thermal insulation, top heat-conductive coating has heat conduction and lubrication concurrently, on subbing, apply the thermal insulation coatings of die cavity thermal insulation like this, and then the coating top heat-conductive coating, make it to constitute adiabatic composite coating; And on subbing, directly apply top heat-conductive coating, then constitute the heat conduction composite coating.Adopt above-mentioned coating and adopt composite coating technology, composite coating just has good thermal physical characteristic and off-type, has durability or semipermanent again.
2, the thermal insulation coatings and the top heat-conductive coating of riser head heat-preserving coating, die cavity thermal insulation are supporting, to play the effect of regulating casting solidification.
Though the thermal insulation coatings of riser head heat-preserving coating and die cavity thermal insulation adopts heat preserving aggregate of the same race, but the former will make paste and aggregate size is thick partially, be convenient to brush thick and do not trickle, the latter will make pulpous state and aggregate size partially carefully is easy to spraying, viscosity is low and suspension good, can realize different parts, the requirement of different degree of insulation.According to of the specific (special) requirements of foundry goods different parts, adopt the coating of different heat conductivilitys, different coating thickness and surface roughness, to reach the purpose of control foundry goods cooling velocity to coating.For example, at the dead head place, apply thicker riser head heat-preserving coating, fill type and feeding capacity with raising, at iron core or the abundant mould nest place of foundry goods, the top heat-conductive coating that spraying is thin to eliminate local shrinkage porosite, obtains sound casting.
Thermal insulation coatings of the present invention has good suspension, screening characteristics; Be used with subbing and top heat-conductive coating, have the effect of tangible adjusting foundry goods cooling velocity and the feeding effect of raising rising head, have good lubricity, be convenient to loose core and the foundry goods removing from mould; Adhesive strength height, long service life have semipermanent.Use this coating series production aluminium alloy castings surface roughness and can reach Ra3.2～12.5 μ m, than the zinc oxide coating raising secondary of routine, its main performance index reaches the international advanced similar coating property index of Britain Foseco company:
During the checking of producing, the actual prescription of described coating is: the thermal insulation coatings of die cavity thermal insulation
| Heat transfer coefficient W/m 2·C 0 | Strength of coating N/mm 2 | Suspension | Gas forming amount ml/g | |
| The die cavity thermal insulation paint | ＜400 (coating 0.15mm) | ???＞3.2 | ??＞90％ | ???＜20 |
| Riser head heat-preserving coating | ＜160 (coating 0.65mm) | ???＞2.5 | Paste | ???＜20 |
Mica powder (50～28 μ m) 50%
Diatomite (50～28 μ m) 20%
Rectorite 5%
Alkaline silica sol (PH=10) 15%
Na
3NO
4Saturated aqueous solution 10%
Water is an amount of
Dope viscosity is 16sec, adopts No. 4 flow cup timing.Riser head heat-preserving coating
Mica powder (100～63 μ m) 50%
Diatomite (80～50 μ m) 25%
Acidic silicasol (PH=2) 15%
Rectorite 5%
Waterglass (modulus 2.8) 10%
Water is an amount of
Coating is paste
Claims (3)
1. metal type heat-insulation coating, the prescription that it is characterized by this coating is by weight percentage: mica powder 45～65%, diatomite 15～25%, rectorite 5～10%, Ludox 10～20%, sodium-salt aqueous solution 5～10%, above-mentioned raw materials add water and are rolled into paste or pulpous state.
2. metal heat preservation coating as claimed in claim 1, it is characterized by described Ludox is alkaline silica sol, pH value 9～11, described sodium-salt aqueous solution is Na
3PO
4Saturated aqueous solution, mica powder granularity 50～20 μ m, diatomite granularity 50～28 μ m, raw material drop into when mill is rolled in colloid mill or the ball mill, and the addition of water is controlled between 15～25 seconds the viscosity of coating.
3. metal type heat-insulation coating as claimed in claim 1, it is characterized by described Ludox is acidic silicasol, pH value 2～4, described sodium-salt aqueous solution is waterglass, modulus 2.5～3.0, described mica powder granularity 100～63 μ m, diatomite granularity 80～50 μ m, raw material adopts mixer or rivet bucker to prepare, and the addition of water makes coating be paste.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99116316A CN1071162C (en) | 1999-01-18 | 1999-01-18 | Metal type heat-insulation coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99116316A CN1071162C (en) | 1999-01-18 | 1999-01-18 | Metal type heat-insulation coating |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94104236A Division CN1045096C (en) | 1994-04-23 | 1994-04-23 | Metal type coating series |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1243050A true CN1243050A (en) | 2000-02-02 |
| CN1071162C CN1071162C (en) | 2001-09-19 |
Family
ID=5279144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99116316A Expired - Fee Related CN1071162C (en) | 1999-01-18 | 1999-01-18 | Metal type heat-insulation coating |
Country Status (1)
| Country | Link |
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| CN (1) | CN1071162C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100588689C (en) * | 2008-02-22 | 2010-02-10 | 刘�文 | Radiation-resisting composite dope |
| CN102397987A (en) * | 2011-11-23 | 2012-04-04 | 北京交通大学 | Self-temperature regulating mould and using method thereof |
| CN105127364A (en) * | 2015-08-25 | 2015-12-09 | 苏州热工研究院有限公司 | Mold releasing coating for centrifugal casting and painting method of mold releasing coating |
| CN105440465A (en) * | 2014-09-29 | 2016-03-30 | 中国石油化工股份有限公司 | Plastic-rubber composition and its preparation method and film |
| CN117282922A (en) * | 2023-09-23 | 2023-12-26 | 河北北方铸业有限公司 | Non-contact thermal repairing technology for castings |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5063972A (en) * | 1989-09-15 | 1991-11-12 | Sulzer Brothers Limited | Projectile accelerator for a loom |
| CN1017030B (en) * | 1990-07-24 | 1992-06-17 | 鸡西市柳毛石墨矿 | Solid coating for steel ingot mold and its production method |
-
1999
- 1999-01-18 CN CN99116316A patent/CN1071162C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100588689C (en) * | 2008-02-22 | 2010-02-10 | 刘�文 | Radiation-resisting composite dope |
| CN102397987A (en) * | 2011-11-23 | 2012-04-04 | 北京交通大学 | Self-temperature regulating mould and using method thereof |
| CN102397987B (en) * | 2011-11-23 | 2015-03-11 | 北京交通大学 | Self-temperature regulating mould and using method thereof |
| CN105440465A (en) * | 2014-09-29 | 2016-03-30 | 中国石油化工股份有限公司 | Plastic-rubber composition and its preparation method and film |
| CN105127364A (en) * | 2015-08-25 | 2015-12-09 | 苏州热工研究院有限公司 | Mold releasing coating for centrifugal casting and painting method of mold releasing coating |
| CN117282922A (en) * | 2023-09-23 | 2023-12-26 | 河北北方铸业有限公司 | Non-contact thermal repairing technology for castings |
| CN117282922B (en) * | 2023-09-23 | 2024-04-26 | 河北北方铸业有限公司 | Non-contact thermal repairing technology for castings |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1071162C (en) | 2001-09-19 |
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