CN112045147A - Surface coating for inner surface of sand mold of high-temperature alloy mold casting and using method - Google Patents
Surface coating for inner surface of sand mold of high-temperature alloy mold casting and using method Download PDFInfo
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- CN112045147A CN112045147A CN202010972772.7A CN202010972772A CN112045147A CN 112045147 A CN112045147 A CN 112045147A CN 202010972772 A CN202010972772 A CN 202010972772A CN 112045147 A CN112045147 A CN 112045147A
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- 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
Abstract
The invention discloses a sand mold inner surface coating of a high-temperature alloy mold casting and a using method, which are composed of the following components: zircon powder, alumina micropowder, silica sol and alumina sol. The invention has the advantages that: the strength is high at low temperature, the high temperature resistance is realized at high temperature, and the scouring of molten steel is resisted at high temperature; after the inner surface coating of the sand mold of the isothermal forging high-temperature alloy mold casting is coated on the inner surface of the sand mold, the inner surface of the sand mold has good finish and no pores; can be used in vacuum environment.
Description
Technical Field
The invention relates to the scientific and technical field of aviation isothermal forging structural parts, in particular to a sand mold inner surface coating of a high-temperature alloy mold casting and a using method thereof.
Background
The high-temperature alloy die and the large stainless steel casting adopted by the aviation structure forging piece are forged by the isothermal forging die because aviation materials are expensive, such as the whole material processing wastes materials, the molded surface is complex, the working hour cost is expensive, and the processing is difficult, so that the materials are saved, and the waste of resources is avoided.
Because a high-temperature alloy die is used in isothermal forging, the high-temperature alloy has special material, heavy die weight, heavy single piece weight and large piece size in use, and the high alloy can not be formed after forging and can only be cast and formed. The material has high hardness, high temperature resistance, high quality requirement of an isothermal forging die, no inclusion, casting molding, smelting in vacuum, expensive and strictly selected materials used in vacuum pouring, no air release phenomenon of the used materials, high temperature resistance, original alcohol coating, resin serving as a bonding agent in the coating, large air release amount of the resin at high temperature, slag inclusion, air holes, impurities and the like in a casting. The resin bonding agent loses the function of the bonding agent when the sand type is baked to 200 ℃, so that the defect of isothermal forging high-temperature alloy castings is caused, the isothermal forging high-temperature alloy castings need to have smooth surfaces and cannot be adhered with sand, the organic bonding agent for alcohol paint cannot resist high temperature and resist high temperature molten steel scouring, and due to the fact that high-temperature alloy materials are poor in plasticity and high in rejection rate, the isothermal forging casting high-temperature alloy molds cannot be subjected to repair welding, if repair welding and high-temperature heating are needed, if the control is not good in the heating process, the molds crack, and the defects are reported to be wasted.
Therefore, the inner surface coating of the sand mold of the high-temperature alloy mold casting needs to be designed, and the purpose is to solve the defects that the high-temperature coating in the prior art has an air release phenomenon, is not high-temperature resistant and cannot be used in a vacuum environment.
Disclosure of Invention
The invention aims to solve the problems that the high-temperature coating in the prior art has an air bleeding phenomenon, is not high-temperature resistant and cannot be used in a vacuum environment.
The invention is realized by the following technical scheme:
the inner surface coating of the sand mold of the high-temperature alloy mold casting comprises the following components: zircon powder, alumina micropowder, silica sol and alumina sol.
Because a high-temperature alloy die is used in isothermal forging, the high-temperature alloy die is special in material, heavy in die weight, large in piece, incapable of being formed after forging, high in material hardness and high in high temperature resistance, casting forming needs to be smelted under vacuum, the material requirement for vacuum pouring is very strict, the used material is high temperature resistant and incapable of generating an air release phenomenon, the resin used as a binding agent in the original alcohol coating is large in air release amount at high temperature, the binding strength of the coating is weakened, the coating is flushed away in the molten steel flushing process, and the coating is mixed into the molten steel, so that slag, air holes and impurities are formed in a casting. The high-temperature alloy casting part is required to have a smooth surface and cannot be stuck with sand, an organic binding agent for alcohol paint cannot resist high temperature and resist high-temperature molten steel scouring, the plasticity of the added high-temperature alloy material is poor, the rejection rate is high, an isothermal forging casting high-temperature alloy mold cannot be subjected to repair welding, the repair welding needs high-temperature heating, and the mold can crack and be discarded if the heating process is not well controlled. The prior art results in lower quality superalloy casting molds. After vacuum casting, the casting can be taken out of the vacuum casting chamber after being slowly cooled in the vacuum casting chamber for 8 hours, and after the casting is taken out of the vacuum casting chamber, the surface is red, the temperature is high, and therefore the high-temperature coating can resist the high temperature for 8 hours.
The invention adopts two sols: silica sol and alumina sol, inorganic materials of zircon powder and alumina micropowder are well bonded together and matched with each other, nano SiO2 colloidal particles are adsorbed on the surfaces of ceramic particles, the silica sol Si-O-Si forms chemical bonds with aluminum in the ceramic, the alumina sol is used as a dispersion medium and an adhesive, the zircon powder is added to resist high temperature, the alumina micropowder is also a high temperature resistant inorganic bonding agent, thickening tension is reduced, cracking and microcrack generation of the colloid in the drying process are effectively controlled, and the silica sol and the alumina sol are high in strength at low temperature and high in temperature resistance at high temperature and can not generate an air release phenomenon when used in a vacuum environment.
Further, the mixture ratio of the components is as follows: 55-75 parts of zircon powder, 20-37 parts of aluminum oxide micro powder, 20-45 parts of silica sol and 4-17 parts of aluminum sol.
Further, the mixture ratio of the components is as follows: 57-65 parts of zircon powder, 27-35 parts of aluminum oxide micro powder, 25-40 parts of silica sol and 7-15 parts of aluminum sol.
Further, 65 parts of zircon powder, 27 parts of aluminum oxide micro powder, 35 parts of silica sol and 15 parts of aluminum sol;
65 parts of zircon powder, 27 parts of aluminum oxide micro powder, 35 parts of silica sol and 15 parts of alumina sol, wherein the strength of the alumina sol is 100 MPa, and the refractoriness of the alumina sol is 2220.5 degrees.
Further, 57 parts of zircon powder, 35 parts of aluminum oxide micro powder, 40 parts of silica sol and 5 parts of aluminum sol;
57 parts of zircon powder, 35 parts of aluminum oxide micro powder, 40 parts of silica sol, 5 parts of alumina sol, 110 MPa in strength and 2178.1 ℃ in refractoriness.
Further, the zircon powder is 400-1200 meshes;
the content of zirconia in the zircon powder is preferably more than 65 percent, and the refractoriness of the zircon powder is 2430 degrees;
preferably, the zircon powder is 400 mesh.
Further, the purity of the aluminum oxide micro powder is more than 98 percent;
the average grain size of the aluminum oxide micro powder is 1 micron, the sodium is less than 0.35 percent, and the iron is less than 0.13 percent.
Furthermore, the particle size of the silica sol and the aluminum sol is 10-20 nanometers;
the grain diameter of the silica sol is 10-20 nanometers, and 10-20 nanometers of aluminum sol is also added.
A use method of a high-temperature coating for a high-temperature alloy casting die comprises the following steps:
uniformly mixing zircon powder and aluminum oxide micro powder, and sieving the mixed powder by using a 0.178mm mesh sieve to obtain more uniform and fine mixed powder for later use; mixing silica sol and aluminum sol to obtain a colloid mixture, adding absolute alcohol into the colloid mixture, uniformly stirring, reacting at normal temperature for at least 4 hours to obtain flocculent colloid, and uniformly stirring again; the fine mixed powder and the colloid are uniformly mixed to obtain the qualified high-temperature coating, the coating which is not used up can be used after being sealed, and the strength of the white solid after use is high. The coating has high strength and refractoriness, and has higher low-temperature strength than other high-temperature coatings and higher refractoriness at high temperature, and the sand mold of the isothermal forging casting high-temperature alloy mold casting can be used in vacuum casting in a vacuum chamber only after being baked to 400 ℃ of 300-.
Further, the amount of absolute alcohol added was 5% by mass of the colloid mixture.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the coating for the inner surface of the sand mold of the high-temperature alloy mold casting has high strength at low temperature, can resist high temperature at high temperature, and can resist scouring of molten steel at high temperature.
2. The high-temperature alloy die casting sand mold inner surface coating has good smoothness and no air holes after the high-temperature alloy die casting sand mold inner surface coating for isothermal forging casting is coated on the inner surface of the sand mold.
3. The surface coating on the inner surface of the sand mold of the high-temperature alloy mold casting can be used in a vacuum environment, and the formula is nontoxic, practical and convenient.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic flow diagram of a paint casting.
FIG. 2 is a schematic view of the surface of a casting.
FIG. 3 is a schematic view of a coating on a surface of a casting after polishing.
1-insulating riser and 2-insulating brick.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not used as limitations of the present invention.
Example 1
As shown in figures 1, 2 and 3, the invention relates to a sand mold inner surface coating of a high-temperature alloy mold casting, which comprises the following components: 57 parts of zircon powder;
35 parts of aluminum oxide micro powder;
40 parts of silica sol;
and 5 parts of aluminum sol.
The use process comprises the following steps: uniformly stirring 57 parts of zircon powder and 35 parts of aluminum oxide micro powder to obtain mixed powder; sieving the obtained mixed powder by using a mesh sieve to obtain fine mixed powder, and fully and uniformly stirring the sieved fine mixed powder to facilitate the next step of use; mixing 40 parts of silica sol and 5 parts of alumina sol to obtain a colloid mixture, adding absolute alcohol into the colloid mixture, uniformly stirring, reacting at normal temperature for at least 4 hours to obtain a flocculent colloid substance, and uniformly stirring again; the fine mixed powder and the colloid are uniformly mixed to obtain the qualified high-temperature coating, the coating which is not used up can be used after being sealed, and the strength of the white solid after use is strong. The preparation method is characterized by reacting for 4 hours at normal temperature.
The coating is coated on the inner surface of the shell, the strength of the coating is 110 MPa, the fire resistance is 2178.1, and the coating has higher low-temperature strength and higher fire resistance at high temperature than other high-temperature coatings.
Example 2
As shown in fig. 1, 2 and 3, the present example is based on example 1, the present invention is a coating for the inner surface of a sand mold of a superalloy mold casting,
the composition comprises the following components: 60 parts of zircon powder;
34 parts of aluminum oxide micro powder;
20 parts of silica sol;
and 10 parts of aluminum sol.
The use process comprises the following steps: uniformly stirring 60 parts of zircon powder and 34 parts of aluminum oxide micro powder to obtain mixed powder; sieving the obtained mixed powder by using a mesh sieve to obtain fine mixed powder, and fully and uniformly stirring the sieved fine mixed powder to facilitate the next step of use; mixing 20 parts of silica sol and 10 parts of alumina sol to obtain a colloid mixture, adding absolute alcohol into the colloid mixture, uniformly stirring, reacting at normal temperature for at least 4 hours to obtain a flocculent colloid substance, and uniformly stirring again; the fine mixed powder and the colloid are uniformly mixed to obtain the qualified high-temperature coating, the coating which is not used up can be used after being sealed, and the strength of the white solid after use is strong. The preparation method is characterized by reacting for 4 hours at normal temperature.
The coating is coated on the inner surface of the shell, the strength of the coating is 70 MPa, the fire resistance is 2200, and the coating has higher low-temperature strength and higher fire resistance at high temperature than other high-temperature coatings.
Example 3
As shown in fig. 1, 2 and 3, the present example is based on examples 1 and 2, the present invention is a surface coating for the inner surface of a sand mold of a superalloy mold casting,
the composition comprises the following components: 70 parts of zircon powder;
24 parts of aluminum oxide micro powder;
25 parts of silica sol;
and 7 parts of aluminum sol.
The use process comprises the following steps: uniformly stirring 70 parts of zircon powder and 24 parts of aluminum oxide micro powder to obtain mixed powder; sieving the obtained mixed powder by using a mesh sieve to obtain fine mixed powder, and fully and uniformly stirring the sieved fine mixed powder to facilitate the next step of use; mixing 25 parts of silica sol and 7 parts of alumina sol to obtain a colloid mixture, adding absolute alcohol into the colloid mixture, uniformly stirring, reacting at normal temperature for at least 4 hours to obtain a flocculent colloid substance, and uniformly stirring again; the fine mixed powder and the colloid are uniformly mixed to obtain the qualified high-temperature coating, the coating which is not used up can be used after being sealed, and the strength of the white solid after use is strong. The preparation method is characterized by reacting for 4 hours at normal temperature.
The strength of the coating coated on the shell mold is 90 MPa, the fire resistance is 2259, and the coating has higher low-temperature strength and higher fire resistance at high temperature than other high-temperature coatings.
Example 4
As shown in fig. 1, 2 and 3, this example is based on examples 1, 2 and 3, the invention is a coating on the inner surface of a sand mold of a high-temperature alloy mold casting,
the composition comprises the following components: 65 parts of zircon powder;
27 parts of aluminum oxide micro powder;
35 parts of silica sol;
and 15 parts of aluminum sol.
The use process comprises the following steps: uniformly stirring 65 parts of zircon powder and 27 parts of aluminum oxide micro powder to obtain mixed powder; sieving the obtained mixed powder by using a mesh sieve to obtain fine mixed powder, and fully and uniformly stirring the sieved fine mixed powder to facilitate the next step of use; mixing 35 parts of silica sol and 15 parts of alumina sol to obtain a colloid mixture, adding absolute alcohol into the colloid mixture, uniformly stirring, reacting at normal temperature for at least 4 hours to obtain a flocculent colloid substance, and uniformly stirring again; the fine mixed powder and the colloid are uniformly mixed to obtain the qualified high-temperature coating, the coating which is not used up can be used after being sealed, and the strength of the white solid after use is strong. The preparation method is characterized by reacting for 4 hours at normal temperature.
The strength of the coating coated in the shell is 100 MPa, the fire resistance is 2220.5, and the coating has higher low-temperature strength and higher fire resistance at high temperature than other high-temperature coatings.
The strength and fire resistance results of the coatings of examples 1-4 after application were determined as shown in table 1 below:
TABLE 1 coating test results of various examples
| Examples | Strength (MPa) | Degree of refractoriness |
| Example 1 | 110 | 2178.1 |
| Example 2 | 70 | 2200 |
| Example 3 | 90 | 2259 |
| Example 4 | 100 | 2220.5 |
As can be seen from the table above, the strength value of the coating in example 1 is the maximum, and the coating is 110 MPa, and the components comprise 70 parts of zircon powder, 24 parts of aluminum oxide micro powder, 25 parts of silica sol and 7 parts of aluminum sol; the refractoriness value is 2259 in example 3, and the components are 70 parts of zircon powder, 24 parts of alumina micropowder, 25 parts of silica sol and 7 parts of alumina sol.
As shown in figure 1, the heat-insulating riser is arranged above the sand mould, the casting is arranged in the sand mould, the prepared coating is coated on the inner surface of the heat-insulating riser, the coating on the inner surface of the heat-insulating riser is very thin, the surface is smooth after the molten steel is poured and cooled, no air holes and no slag are left, the high-temperature alloy molten steel in the heat-insulating riser needs to be cooled and shrunk in the water cooling process of the high-temperature alloy steel of the casting, and the high-temperature coating on the inner surface of the sand mould has high strength at low temperature, can resist high temperature at high temperature and can resist the scouring of the molten steel.
As shown in figure 2, the coating on the surface of the high-temperature alloy after the heat-insulating riser is cooled automatically falls off, and the coating in the heat-insulating riser is not polished.
As shown in FIG. 3, the inner surface of the sand mold of the high-temperature alloy mold casting is subjected to isothermal forging, and the polished coating is smooth and has no cracks.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The inner surface coating for the sand mold of the high-temperature alloy mold casting is characterized by comprising the following components: zircon powder, alumina micropowder, silica sol and alumina sol.
2. The inner surface coating for the sand mold of the superalloy mold casting according to claim 1, wherein the ratio of the components is: 55-75 parts of zircon powder, 20-37 parts of aluminum oxide micro powder, 20-45 parts of silica sol and 4-17 parts of aluminum sol.
3. The inner surface coating for the sand mold of the superalloy mold casting according to claim 1, wherein the ratio of the components is: 57-65 parts of zircon powder, 27-35 parts of aluminum oxide micro powder, 25-40 parts of silica sol and 7-15 parts of aluminum sol.
4. The inner surface coating for the sand mold of the high-temperature alloy mold casting according to claim 1, wherein the inner surface coating comprises 65 parts of zircon powder, 27 parts of aluminum oxide micropowder, 35 parts of silica sol and 15 parts of aluminum sol.
5. The inner surface coating for the sand mold of the high-temperature alloy mold casting according to claim 1, wherein the inner surface coating comprises 57 parts of zircon powder, 35 parts of aluminum oxide micro powder, 40 parts of silica sol and 5 parts of aluminum sol.
6. A superalloy mold casting sand mold inner surface coating according to claim 1, wherein the zircon powder is 400-1200 mesh.
7. The inner surface coating of the sand mold of the superalloy mold casting according to claim 1, wherein the purity of the alumina micropowder is greater than 98%.
8. A superalloy mold casting sand mold inner surface coating according to claim 1, wherein the silica sol and alumina sol have a particle size of 10-20 nm.
9. A method of using the superalloy mold casting sand mold internal surface coating of any of claims 1 to 8, comprising the steps of: uniformly mixing zircon powder and aluminum oxide micro powder and refining to obtain fine mixed powder; mixing silica sol and aluminum sol to obtain a colloid mixture, adding absolute alcohol into the colloid mixture, uniformly stirring, reacting for at least 4 hours to obtain flocculent colloid, and uniformly stirring again; and uniformly mixing the fine mixed powder and the colloid to obtain the coating.
10. The method for using the surface coating on the inner surface of the sand mold of the superalloy mold casting according to claim 9, wherein the absolute alcohol is added in an amount of 5% of the mass of the colloid mixture.
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| EP0420781A2 (en) * | 1989-09-08 | 1991-04-03 | Bostlan, S.A. | Refractory paint for covering foundry moulds |
| CN101182192A (en) * | 2007-11-16 | 2008-05-21 | 上海伊索热能技术有限公司 | Ceramic fibre composition reducing variation of higher temperature lines and preparation technique thereof |
| CN103964862A (en) * | 2013-02-06 | 2014-08-06 | 济南圣泉倍进陶瓷过滤器有限公司 | Ceramic filter and preparation method thereof |
| CN107382342A (en) * | 2017-08-03 | 2017-11-24 | 济南圣泉倍进陶瓷过滤器有限公司 | A kind of exotic material and its preparation method and application |
| CN108453243A (en) * | 2018-04-10 | 2018-08-28 | 昆明理工大学 | A kind of ceramic-metal composites preparation method |
| CN108558421A (en) * | 2018-06-11 | 2018-09-21 | 无锡远能耐火材料有限公司 | Waste incinerator castable refractory and its method prepared by discarded high tension insulator |
| CN108787996A (en) * | 2018-07-11 | 2018-11-13 | 佛山市高明区爪和新材料科技有限公司 | A kind of Sand sticking-resistant cast paint and preparation method thereof |
-
2020
- 2020-09-16 CN CN202010972772.7A patent/CN112045147A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0420781A2 (en) * | 1989-09-08 | 1991-04-03 | Bostlan, S.A. | Refractory paint for covering foundry moulds |
| CN101182192A (en) * | 2007-11-16 | 2008-05-21 | 上海伊索热能技术有限公司 | Ceramic fibre composition reducing variation of higher temperature lines and preparation technique thereof |
| CN103964862A (en) * | 2013-02-06 | 2014-08-06 | 济南圣泉倍进陶瓷过滤器有限公司 | Ceramic filter and preparation method thereof |
| CN107382342A (en) * | 2017-08-03 | 2017-11-24 | 济南圣泉倍进陶瓷过滤器有限公司 | A kind of exotic material and its preparation method and application |
| CN108453243A (en) * | 2018-04-10 | 2018-08-28 | 昆明理工大学 | A kind of ceramic-metal composites preparation method |
| CN108558421A (en) * | 2018-06-11 | 2018-09-21 | 无锡远能耐火材料有限公司 | Waste incinerator castable refractory and its method prepared by discarded high tension insulator |
| CN108787996A (en) * | 2018-07-11 | 2018-11-13 | 佛山市高明区爪和新材料科技有限公司 | A kind of Sand sticking-resistant cast paint and preparation method thereof |
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