CN112496254A - Heat-preservation demolding coating for casting - Google Patents
Heat-preservation demolding coating for casting Download PDFInfo
- Publication number
- CN112496254A CN112496254A CN202011270702.3A CN202011270702A CN112496254A CN 112496254 A CN112496254 A CN 112496254A CN 202011270702 A CN202011270702 A CN 202011270702A CN 112496254 A CN112496254 A CN 112496254A
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- CN
- China
- Prior art keywords
- coating
- casting
- heat
- preservation
- demolding
- 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.)
- Pending
Links
- 238000000576 coating method Methods 0.000 title claims abstract description 53
- 239000011248 coating agent Substances 0.000 title claims abstract description 50
- 238000005266 casting Methods 0.000 title claims abstract description 34
- 238000004321 preservation Methods 0.000 title claims abstract description 11
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052582 BN Inorganic materials 0.000 claims abstract description 8
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 239000010445 mica Substances 0.000 claims abstract description 8
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 8
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 8
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000011230 binding agent Substances 0.000 claims abstract description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 9
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 claims description 7
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 7
- 229940080314 sodium bentonite Drugs 0.000 claims description 7
- 229910000280 sodium bentonite Inorganic materials 0.000 claims description 7
- 239000003381 stabilizer Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 239000003973 paint Substances 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 abstract description 23
- 239000002184 metal Substances 0.000 abstract description 23
- 238000005299 abrasion Methods 0.000 abstract description 5
- 239000000853 adhesive Substances 0.000 abstract description 4
- 230000001070 adhesive effect Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 239000000203 mixture Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 238000001000 micrograph Methods 0.000 description 4
- 239000008199 coating composition Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011081 inoculation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005058 metal casting Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007528 sand casting Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Images
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention provides a heat-preservation demolding coating for casting, and mainly relates to the field of coatings. A heat-preservation demolding coating for casting comprises the following components in percentage by mass: 5% -7% of mica; 8% -12% of boron nitride; 3% -4% of titanium dioxide; 8% -10% of water glass; 16% -22% of a binder; the balance of water and inevitable impurities. The invention has the beneficial effects that: the invention has better adhesive force on the working surface of the metal mold, stronger abrasion resistance and finer surface finish of the cast casting.
Description
Technical Field
The invention mainly relates to the field of coatings, and particularly relates to a heat-preservation demolding coating for casting.
Background
The common sand casting can not meet the requirements of casting production, more special castings are used on a large scale successively with the advantages of high precision, good damage resistance, low cost and the like, and the metal casting is increasingly used with the advantages of high process performance, simple working procedure and high surface smoothness of castings. The metal type heat-insulating coating has a heat insulation effect, can reduce the cooling speed of a solution, prevents a casting from being white, weakens the thermal shock of the solution to the metal type during pouring, relaxes the thermal stress, prevents the corrosion of molten metal, and plays a role in protecting the metal type. In addition, the surface is smooth, so that the casting is easy to separate from the casting mold, and the inoculation on the casting surface is expected.
But the conventional metal type cast aluminum coating has poor adhesive force and poor abrasion resistance.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a heat-preservation demolding coating for casting, which has better adhesive force on the working surface of a metal mold, stronger abrasion resistance and finer surface smoothness of a cast piece.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a heat-preservation demolding coating for casting comprises the following components in percentage by mass: 5% -7% of mica; 8% -12% of boron nitride; 3% -4% of titanium dioxide; 8% -10% of water glass; 16% -22% of a binder; the balance of water and inevitable impurities.
Preferably, the binder comprises 3% -6% of sodium bentonite; 12% -15% of silica sol; 1.0 percent of stabilizing agent.
Preferably, the heat-preservation demolding coating for casting comprises the following components in percentage by mass: 6% of mica; 10% of boron nitride; 4% of titanium dioxide; 9% of water glass; 5% of sodium bentonite; silica sol 14%; 1.0% of a stabilizer; the balance of water and inevitable impurities.
Preferably, the coating is applied to the working surface of the casting mould at the time of use.
Preferably, the coating is re-coated once after the molding times of 120-150.
A use method of a heat-preservation demolding coating for casting comprises the following steps:
s1: uniformly mixing the components as described in any one of claims 1-2 to obtain a coating;
s2: uniformly coating the paint mixed in the step S1 on the working surface of the die;
s3: recoating once after 120-150 mold times.
The casting method of aluminum parts is to coat the paint comprising the components on the working surface of the casting mold before casting.
Compared with the prior art, the invention has the beneficial effects that:
the heat-insulating demolding coating is applied to a metal mold, when an aluminum piece is cast, the metal mold coated with the coating enables the metal liquid to have better fluidity, the coating has better adhesive force on the working surface of the metal mold and stronger abrasion resistance, the metal mold can be better protected, and the surface quality of an aluminum casting is improved.
Drawings
FIG. 1a is a graph showing the effect of a coating of the composition of example 1 of the present invention sprayed on a metal mold and sanded with sandpaper;
FIG. 1b is a diagram showing the effect of the present invention in comparative example 1, which is obtained by spraying a general coating material on a metal mold and then sanding with sandpaper;
FIG. 2a shows the results of 150 mold cycles of the coating composition of example 1 after it was sprayed on a metal mold;
FIG. 2b shows the effect of comparative example 1 after spraying the common coating on the metal mold and performing 150 mold secondary operations;
FIG. 3a is a micrograph of a coating of the composition of example 1;
FIG. 3b is a micrograph of the coating of comparative example 1.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and these equivalents also fall within the scope of the present application.
Example 1:
in the embodiment, the coating is prepared from the following components in percentage by mass: 6% of mica; 10% of boron nitride; 4% of titanium dioxide; 9% of water glass; 5% of sodium bentonite; silica sol 14%; 1.0% of a stabilizer; the balance of water and inevitable impurities.
Example 2:
in the embodiment, the coating is prepared from the following components in percentage by mass: 5% of mica; 8% of boron nitride; 3% of titanium dioxide; 8% of water glass; 3% of sodium bentonite; 12% of silica sol; 1.0% of a stabilizer; the balance of water and inevitable impurities.
Example 3:
in the embodiment, the coating is prepared from the following components in percentage by mass: 7% of mica; 12% of boron nitride; 4% of titanium dioxide; 10% of water glass; 6% of sodium bentonite; 15% of silica sol; 1.0% of a stabilizer; the balance of water and inevitable impurities.
Example 4:
aiming at any embodiment of 1 to 3, the components of any embodiment are uniformly mixed to obtain a coating; and (4) uniformly coating the coating mixed in the step S1 on the working surface of the die, and then, after the die is aired, casting the aluminum piece by using the die. The die was recoated once after 150 passes.
Comparative example 1:
and uniformly coating the 395-type coating on the working surface of the die, and casting the aluminum piece by using the die.
As shown in the figure, the two coatings of example 1 and comparative example 1 are compared.
In FIG. 1, a shows the effect of sanding with sandpaper after the coating material of the composition of example 1 was sprayed on a metal mold, and b shows the effect of sanding with sandpaper after the ordinary coating material of comparative example 1 was sprayed on a metal mold. As shown, the coating in b had significant scratches, while no scratches were visible to the naked eye in a, thus demonstrating the better adhesion and better wear resistance of the coating of the composition of example 1 on the die.
In FIG. 2, a shows the effect of the coating composition of example 1 after being applied to a mold of a metal mold and subjected to 150 mold cycles, and b shows the effect of comparative example 1 after the coating composition of example 1 is applied to a mold of a metal mold and subjected to 150 mold cycles. As shown in the figure, the painted surface of the metal mold in the step a is worn uniformly and has no aluminum adhesion phenomenon, and the painted surface of the metal mold in the step b is worn seriously and has severe aluminum adhesion. Thus, the coating material of the composition of example 1 has better abrasion resistance on the metal mold and can effectively prevent the phenomenon of aluminum adhesion.
In FIG. 3, a is a micrograph of the coating of the composition of example 1 and b is a micrograph of the coating of comparative example 1. As can be seen from the figure, the particles in a are fine and uniform, and the particles in b are non-uniform and coarse. Therefore, the cast product has higher surface smoothness and higher surface quality after the coating with the component of the example 1 is applied.
Claims (7)
1. The heat-preservation demolding coating for casting is characterized by comprising the following components in percentage by mass: 5% -7% of mica; 8% -12% of boron nitride; 3% -4% of titanium dioxide; 8% -10% of water glass; 16% -22% of a binder; the balance of water and inevitable impurities.
2. The heat-insulating mold release coating for casting according to claim 1, characterized in that: the binder comprises 3% -6% of sodium bentonite; 12% -15% of silica sol; 1.0 percent of stabilizing agent.
3. The heat-insulating mold release coating for casting according to claim 2, characterized in that: the composite material comprises the following components in percentage by mass: 6% of mica; 10% of boron nitride; 4% of titanium dioxide; 9% of water glass; 5% of sodium bentonite; silica sol 14%; 1.0% of a stabilizer; the balance of water and inevitable impurities.
4. A heat-insulating mold release coating for casting according to any one of claims 1 to 3, characterized in that: the coating is applied to the working surface of the casting mold in use.
5. The heat-insulating mold release coating for casting according to claim 4, characterized in that: the coating is re-coated once after the molding times of 120-150.
6. A use method of a heat-preservation demolding coating for casting is characterized by comprising the following steps:
s1: uniformly mixing the components as described in any one of claims 1 to 3 to obtain a coating;
s2: uniformly coating the paint mixed in the step S1 on the working surface of the die;
s3: recoating once after 120-150 mold times.
7. A method for casting an aluminum piece is characterized by comprising the following steps: the coating according to claims 1-2 is applied to the working surface of the casting mould before casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011270702.3A CN112496254A (en) | 2020-11-13 | 2020-11-13 | Heat-preservation demolding coating for casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011270702.3A CN112496254A (en) | 2020-11-13 | 2020-11-13 | Heat-preservation demolding coating for casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112496254A true CN112496254A (en) | 2021-03-16 |
Family
ID=74957556
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011270702.3A Pending CN112496254A (en) | 2020-11-13 | 2020-11-13 | Heat-preservation demolding coating for casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112496254A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11199880A (en) * | 1997-11-13 | 1999-07-27 | Stt Kk | Releasing agent for casting mold |
| CN1276275A (en) * | 1999-06-03 | 2000-12-13 | 三井金属矿业株式会社 | Magnesium alloy pressure die casting method and articles |
| CN1805808A (en) * | 2003-06-13 | 2006-07-19 | Esk制陶两合公司 | Durable bn mould separating agents for the die casting of metals |
| CN101658899A (en) * | 2009-09-17 | 2010-03-03 | 上海交通大学 | Magnesium-alloy metal-type casting coating and preparation method thereof |
| CN106391998A (en) * | 2016-12-02 | 2017-02-15 | 江麓机电集团有限公司 | Coating for sand mould low-pressure casting of aluminum alloy and preparation method thereof |
| CN109865796A (en) * | 2019-04-23 | 2019-06-11 | 福州大学 | A kind of copper alloy permanent mold foundry facing and preparation method thereof |
-
2020
- 2020-11-13 CN CN202011270702.3A patent/CN112496254A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11199880A (en) * | 1997-11-13 | 1999-07-27 | Stt Kk | Releasing agent for casting mold |
| CN1276275A (en) * | 1999-06-03 | 2000-12-13 | 三井金属矿业株式会社 | Magnesium alloy pressure die casting method and articles |
| CN1805808A (en) * | 2003-06-13 | 2006-07-19 | Esk制陶两合公司 | Durable bn mould separating agents for the die casting of metals |
| CN101658899A (en) * | 2009-09-17 | 2010-03-03 | 上海交通大学 | Magnesium-alloy metal-type casting coating and preparation method thereof |
| CN106391998A (en) * | 2016-12-02 | 2017-02-15 | 江麓机电集团有限公司 | Coating for sand mould low-pressure casting of aluminum alloy and preparation method thereof |
| CN109865796A (en) * | 2019-04-23 | 2019-06-11 | 福州大学 | A kind of copper alloy permanent mold foundry facing and preparation method thereof |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210316 |