CN113981262A - Foam metal cavity forming material and forming method thereof - Google Patents
Foam metal cavity forming material and forming method thereof Download PDFInfo
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- CN113981262A CN113981262A CN202111192538.3A CN202111192538A CN113981262A CN 113981262 A CN113981262 A CN 113981262A CN 202111192538 A CN202111192538 A CN 202111192538A CN 113981262 A CN113981262 A CN 113981262A
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- foam metal
- silicate
- cavity forming
- cavity
- carbon black
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/08—Alloys with open or closed pores
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/08—Alloys with open or closed pores
- C22C1/081—Casting porous metals into porous preform skeleton without foaming
- C22C1/082—Casting porous metals into porous preform skeleton without foaming with removal of the preform
Abstract
The invention discloses a foam metal cavity forming material, and particularly relates to the technical field of foam metal cavity forming materials, which comprises the following raw materials: hydrated silica, carbon black, alkali metal silicate. When the cavity forming material is used as a filling sphere, the shape of the sphere can be kept intact during seepage casting, and the smooth inner cavity can be obtained by quickly cleaning the sphere with water after cooling, so that the foam metal with larger shape and size can be formed and manufactured; the invention can solve the problems that the salt filling material is easy to corrode a metal matrix, the existing filling sphere material is loose in texture and cannot form a smooth inner cavity, the existing filling sphere material is difficult to remove and the like in the current foam metal seepage casting, remarkably improves the preparation size and the cavity forming quality of the foam metal, and meets the requirements of working conditions of large bearing explosion prevention, impact resistance and the like on the high-strength stable application of the large-size foam metal.
Description
Technical Field
The invention relates to the technical field of foam metal cavity forming materials, in particular to a foam metal cavity forming material and a forming method thereof.
Background
At present, the preparation technology of the foam metal mainly comprises a foaming method, a seepage casting method, a deposition method and the like. The closed-cell foam metal mainly adopts a foaming method, has the characteristics of thin cavity wall and high porosity, and has remarkable advantages in the aspects of sound absorption and noise reduction; the manufacturing techniques mainly used for open-cell metal foams are the percolation casting method and the deposition method based on chemical pretreatment.
The current seepage casting method adopts a method of presetting cavity forming materials, seepage casting metal molten slurry and cavity forming material clean removal. The cavity forming material mainly adopts soluble salt (such as NaCl, MgSO)4Etc.) or hydratable inorganic materials. The problems of electrochemical corrosion and unsmooth cavity forming exist in the use of soluble salt represented by NaCl, and the soluble salt becomes an important factor influencing the quality of foam metal. The cavity forming material (filling sphere) taking sepiolite, bentonite and vermiculite powder as a matrix is provided in the prior art, so that the size control and the cavity forming control of the forming material are effectively realized, but the hydration cleaning effect of the filling sphere is not ideal enough, so that the incomplete cleaning of the inner sphere material is easy to occur when large-size foamed aluminum is prepared, the surface density of the filling sphere is low, and the quality problem of low smoothness of a foamed metal cavity is easy to occur.
Disclosure of Invention
In order to overcome the above-mentioned defects in the prior art, embodiments of the present invention provide a foam metal cavity molding material and a molding method thereof, and the problems to be solved by the present invention are: the conventional foam metal foaming process has the problems of irregular cavity forming, electrochemical corrosion of salt used for the existing cavity forming material in the seepage casting process, unsmooth cavity inner wall, high cavity material cleaning difficulty and limited foam metal preparation size.
In order to achieve the purpose, the invention provides the following technical scheme: a foam metal cavity molding material comprises the following raw materials in percentage by weight: 20-70% of hydrous silicon dioxide, 20-70% of carbon black and 2-60% of alkali metal silicate.
In a preferred embodiment, the composition comprises the following raw materials in percentage by weight: 30-50% of hydrous silicon dioxide, 30-50% of carbon black and 10-30% of alkali metal silicate.
In a preferred embodiment, the composition comprises the following raw materials in percentage by weight: 35% of hydrated silicon dioxide, 35% of carbon black and 30% of alkali metal silicate.
In a preferred embodiment, the alkali metal silicate is one or more of calcium silicate, magnesium silicate, aluminum silicate, sodium silicate.
The invention also provides a forming method of the foam metal cavity forming material, which comprises the following specific preparation steps:
the method comprises the following steps: weighing the hydrous silicon dioxide, the carbon black and the alkali metal silicate according to the weight percentage, and uniformly stirring and mixing the weighed hydrous silicon dioxide, the weighed carbon black and the weighed alkali metal silicate to obtain mixed powder for later use;
step two: adding a proper amount of water into the mixed powder obtained in the step one, and then making the mixed powder into paste or slurry by using a pulping machine;
step three: pouring the paste or slurry obtained in the step two into a spherical mold, extruding the material by using the spherical mold, simultaneously carrying out auxiliary gradual heating to promote drying and curing of the spherical material, and realizing primary drying and curing when the temperature is raised to 90-95 ℃;
step four: heating to 800-;
step five: and D, taking the spherical material obtained in the fourth step as a cavity forming material of the foam metal, presetting the spherical material in a mold of a seepage casting process for use, introducing the metal raw material of the foam metal into the mold containing the cavity forming material in a pressing or sucking mode for seepage casting and cooling solidification, demoulding, and then placing the mould in an ultrasonic water tank for vibration cleaning, so that hydration and decontamination treatment of the cavity material can be realized, and the foam metal material with regular cavities and continuous through holes can be obtained.
In a preferred embodiment, the stirring rate during the stirring and mixing in the first step is 800-.
In a preferred embodiment, said step consists in mixing the powder to water in a mass ratio of 0.2 to 5.
In a preferred embodiment, the heating rate of the temperature rise in the third step is 0.5-20 ℃/min when the temperature rises to 90-95 ℃, and the temperature rise is kept for 1-60min when the temperature rises to 90-95 ℃.
In a preferred embodiment, in the fourth step, the primarily dried and cured material is demolded and then placed in a muffle furnace or a vacuum heating furnace for high-temperature calcination, the high-temperature calcination temperature is 800-1300 ℃, and the high-temperature calcination time is 20-60min, so as to obtain the spherical material for later use.
The invention has the technical effects and advantages that:
1. when the foam metal cavity forming material prepared by the raw material formula is used as a filling sphere, the cavity forming material can keep the intact sphere shape unchanged during seepage casting, and can be quickly cleaned by water after being cooled to obtain a smooth inner cavity, so that the foam metal with larger shape and size can be formed and manufactured;
2. the invention can solve the problems that the salt filling material is easy to corrode a metal matrix, the existing filling sphere material is loose in texture and cannot form a smooth inner cavity, the existing filling sphere material is difficult to remove and the like in the current foam metal seepage casting, remarkably improves the preparation size and the cavity forming quality of the foam metal, and meets the requirements of working conditions of large bearing explosion prevention, impact resistance and the like on the high-strength stable application of the large-size foam metal.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the invention provides a foam metal cavity forming material which comprises the following raw materials in percentage by weight: 25% of hydrated silicon dioxide, 25% of carbon black and 50% of alkali metal silicate.
In a preferred embodiment, the alkali metal silicate is one or more of calcium silicate, magnesium silicate, aluminum silicate, sodium silicate.
The invention also provides a forming method of the foam metal cavity forming material, which comprises the following specific preparation steps:
the method comprises the following steps: weighing the hydrous silicon dioxide, the carbon black and the alkali metal silicate according to the weight percentage, and uniformly stirring and mixing the weighed hydrous silicon dioxide, the weighed carbon black and the weighed alkali metal silicate to obtain mixed powder for later use;
step two: adding a proper amount of water into the mixed powder obtained in the step one, and then making the mixed powder into paste or slurry by using a pulping machine;
step three: pouring the paste or slurry obtained in the step two into a spherical mold, extruding the material by using the spherical mold, simultaneously carrying out auxiliary gradual heating to promote drying and curing of the spherical material, and realizing primary drying and curing when the temperature is raised to 95 ℃;
step four: heating to 1100 ℃ after the primary drying and solidification, preserving heat for 40min, and then cooling and forming to obtain a spherical material for later use;
step five: and D, taking the spherical material obtained in the fourth step as a cavity forming material of the foam metal, presetting the spherical material in a mold of a seepage casting process for use, introducing the metal raw material of the foam metal into the mold containing the cavity forming material in a pressing or sucking mode for seepage casting and cooling solidification, demoulding, and then placing the mould in an ultrasonic water tank for vibration cleaning, so that hydration and decontamination treatment of the cavity material can be realized, and the foam metal material with regular cavities and continuous through holes can be obtained.
In a preferred embodiment, the stirring rate of the stirring and mixing in the first step is 1000 rpm, and the stirring and mixing time is 80 min.
In a preferred embodiment, said step consists in mixing the powder with water in a mass ratio of 2.
In a preferred embodiment, the heating rate of the heating to 95 ℃ in the third step is 8 ℃/min, and the heating to 95 ℃ is kept for 40 min.
Example 2:
different from the embodiment 1, the invention provides a foam metal cavity molding material, which comprises the following raw materials in percentage by weight: 30% of hydrated silicon dioxide, 30% of carbon black and 40% of alkali metal silicate.
Example 3:
different from the embodiments 1-2, the invention provides a foam metal cavity molding material, which comprises the following raw materials in percentage by weight: 40% of hydrated silicon dioxide, 40% of carbon black and 20% of alkali metal silicate.
Example 4:
the invention provides a foam metal cavity forming material which comprises the following raw materials in percentage by weight: 25% of hydrated silicon dioxide, 25% of carbon black and 50% of alkali metal silicate.
In a preferred embodiment, the alkali metal silicate is one or more of calcium silicate, magnesium silicate, aluminum silicate, sodium silicate.
The invention also provides a forming method of the foam metal cavity forming material, which comprises the following specific preparation steps:
the method comprises the following steps: weighing the hydrous silicon dioxide, the carbon black and the alkali metal silicate according to the weight percentage, and uniformly stirring and mixing the weighed hydrous silicon dioxide, the weighed carbon black and the weighed alkali metal silicate to obtain mixed powder for later use;
step two: adding a proper amount of water into the mixed powder obtained in the step one, and then making the mixed powder into paste or slurry by using a pulping machine;
step three: pouring the paste or slurry obtained in the step two into a spherical mold, extruding the material by using the spherical mold, simultaneously carrying out auxiliary gradual heating to promote drying and curing of the spherical material, and realizing primary drying and curing when the temperature is raised to 95 ℃;
step four: demolding the primarily dried and solidified material, and then placing the demolded material in a muffle furnace or a vacuum heating furnace for high-temperature calcination, wherein the high-temperature calcination temperature is 800-1300 ℃, and the high-temperature calcination time is 20-60min, so as to obtain a spherical material for later use;
step five: and D, taking the spherical material obtained in the fourth step as a cavity forming material of the foam metal, presetting the spherical material in a mold of a seepage casting process for use, introducing the metal raw material of the foam metal into the mold containing the cavity forming material in a pressing or sucking mode for seepage casting and cooling solidification, demoulding, and then placing the mould in an ultrasonic water tank for vibration cleaning, so that hydration and decontamination treatment of the cavity material can be realized, and the foam metal material with regular cavities and continuous through holes can be obtained.
In a preferred embodiment, the stirring rate of the stirring and mixing in the first step is 1000 rpm, and the stirring and mixing time is 80 min.
In a preferred embodiment, said step consists in mixing the powder with water in a mass ratio of 2.
In a preferred embodiment, the heating rate of the heating to 95 ℃ in the third step is 8 ℃/min, and the heating to 95 ℃ is kept for 40 min.
When the foam metal cavity forming material prepared by the raw material formula is used as a filling sphere, the cavity forming material can keep the intact sphere shape unchanged during seepage casting, and can be quickly cleaned by water after being cooled to obtain a smooth inner cavity, so that the foam metal with larger shape and size can be formed and manufactured; the invention can solve the problems that the salt filling material is easy to corrode a metal matrix, the existing filling sphere material is loose in texture and cannot form a smooth inner cavity, the existing filling sphere material is difficult to remove and the like in the current foam metal seepage casting, remarkably improves the preparation size and the cavity forming quality of the foam metal, and meets the requirements of working conditions of large bearing explosion prevention, impact resistance and the like on the high-strength stable application of the large-size foam metal.
And finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (9)
1. A foam metal cavity molding material is characterized in that: comprises the following raw materials in percentage by weight: 20-70% of hydrous silicon dioxide, 20-70% of carbon black and 2-60% of alkali metal silicate.
2. The foam metal cavity molding material as claimed in claim 1, wherein: comprises the following raw materials in percentage by weight: 30-50% of hydrous silicon dioxide, 30-50% of carbon black and 10-30% of alkali metal silicate.
3. The foam metal cavity molding material as claimed in claim 1, wherein: comprises the following raw materials in percentage by weight: 35% of hydrated silicon dioxide, 35% of carbon black and 30% of alkali metal silicate.
4. The foam metal cavity molding material as claimed in claim 1, wherein: the alkali metal silicate is one or more of calcium silicate, magnesium silicate, aluminum silicate and sodium silicate.
5. The method for forming a foam metal cavity forming material according to any one of claims 1 to 4, wherein: the preparation method comprises the following specific steps:
the method comprises the following steps: weighing the hydrous silicon dioxide, the carbon black and the alkali metal silicate according to the weight percentage, and uniformly stirring and mixing the weighed hydrous silicon dioxide, the weighed carbon black and the weighed alkali metal silicate to obtain mixed powder for later use;
step two: adding a proper amount of water into the mixed powder obtained in the step one, and then making the mixed powder into paste or slurry by using a pulping machine;
step three: pouring the paste or slurry obtained in the step two into a spherical mold, extruding the material by using the spherical mold, simultaneously carrying out auxiliary gradual heating to promote drying and curing of the spherical material, and realizing primary drying and curing when the temperature is raised to 90-95 ℃;
step four: heating to 800-;
step five: and D, taking the spherical material obtained in the fourth step as a cavity forming material of the foam metal, presetting the spherical material in a mold of a seepage casting process for use, introducing the metal raw material of the foam metal into the mold containing the cavity forming material in a pressing or sucking mode for seepage casting and cooling solidification, demoulding, and then placing the mould in an ultrasonic water tank for vibration cleaning, so that hydration and decontamination treatment of the cavity material can be realized, and the foam metal material with regular cavities and continuous through holes can be obtained.
6. The method of claim 5, wherein the step of forming the foam metal cavity forming material comprises: the stirring speed is 800-1200 r/min during stirring and mixing in the step one, and the stirring and mixing time is 20-120 min.
7. The method of claim 5, wherein the step of forming the foam metal cavity forming material comprises: the mass ratio of the two-way mixed powder to the water in the step is 0.2-5.
8. The method of claim 5, wherein the step of forming the foam metal cavity forming material comprises: in the third step, the heating rate is 0.5-20 ℃/min when the temperature is raised to 90-95 ℃, and the temperature is kept for 1-60min when the temperature is raised to 90-95 ℃.
9. The method of claim 5, wherein the step of forming the foam metal cavity forming material comprises: and in the fourth step, the primarily dried and solidified material is demoulded and then placed in a muffle furnace or a vacuum heating furnace for high-temperature calcination, wherein the high-temperature calcination temperature is 800-1300 ℃, and the high-temperature calcination time is 20-60min, so that the spherical material is obtained for later use.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111192538.3A CN113981262A (en) | 2021-10-13 | 2021-10-13 | Foam metal cavity forming material and forming method thereof |
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| CN202111192538.3A CN113981262A (en) | 2021-10-13 | 2021-10-13 | Foam metal cavity forming material and forming method thereof |
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| WO2018041032A1 (en) * | 2016-08-31 | 2018-03-08 | 昆山德泰新材料科技有限公司 | Copper foam powder and manufacturing method thereof |
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2021
- 2021-10-13 CN CN202111192538.3A patent/CN113981262A/en not_active Withdrawn
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