CN114213109B - High-precision and high-strength ceramic hand mold and preparation method thereof - Google Patents
High-precision and high-strength ceramic hand mold and preparation method thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
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- B28B1/0873—Producing shaped prefabricated articles from the material by vibrating or jolting by means acting on the mould ; Fixation thereof to the mould the mould being placed on vibrating or jolting supports, e.g. moulding tables
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
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- B28B11/243—Setting, e.g. drying, dehydrating or firing ceramic articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
- B28B13/04—Discharging the shaped articles
- B28B13/06—Removing the shaped articles from moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/38—Treating surfaces of moulds, cores, or mandrels to prevent sticking
- B28B7/384—Treating agents
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- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
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Abstract
The invention discloses a high-precision and high-strength ceramic hand mold and a preparation method thereof, wherein white corundum and alpha alumina powder are adopted as raw materials for manufacturing the hand mold, and although the cost of the raw materials is relatively high, a forming mold is made of polyurethane and paraffin, so that the links of wiping and fettling after a gypsum mold is formed are avoided; the raw materials are subjected to high-temperature treatment, and after the product is fired, the shrinkage is almost 0, so that the firing precision of the product can be effectively guaranteed; meanwhile, the raw materials have extremely high thermal stability, so that the repeated extremely cold and extremely hot phenomena in the glove production process can be effectively resisted, and the use times of the ceramic hand mold are greatly improved; the preparation method gets rid of the links of wiping and trimming blanks and the like in the production process of the traditional clay ceramic hand mold, and greatly improves the production efficiency and the manual error of the product.
Description
Technical Field
The invention discloses the technical field of hand molds for manufacturing PVC gloves and butyronitrile gloves, and particularly relates to a high-precision and high-strength ceramic hand mold and a preparation method thereof.
Background
The ceramic hand mold is mainly applied to the forming process of PVC gloves and butyronitrile gloves, and the size precision control and the surface smoothness of the ceramic hand mold directly influence the size and the appearance quality of the gloves.
At present, the domestic ceramic hand die is mainly prepared by taking a clay material as a main raw material and utilizing a gypsum die for slip casting and high-temperature sintering. Although the process has extremely low raw material cost, the clay material needs to perform blank trimming and wiping work on a formed blank body in the manufacturing process of the ceramic hand die, so that a large amount of labor is consumed in the step, and the qualification rate of products cannot be ensured; the clay material has larger shrinkage in the firing process, which causes the ceramic hand mould to have larger size deviation in the later firing period; meanwhile, in the glove production process, the ceramic hand mold can experience the phenomenon of repeated extreme cold and extreme heat, and the use times of the traditional ceramic hand mold are greatly influenced.
Therefore, how to develop a novel hand model to solve the above problems is a problem to be solved.
Disclosure of Invention
In view of the above, the invention provides a high-precision and high-strength ceramic hand former and a preparation method thereof, so as to solve the problems that the shrinkage is large in the production process of the clay hand former, the size precision of later glove production is influenced, multiple fettling and wiping operations are required in the production process, the production process is complex and the like.
In one aspect, the invention provides a high-precision and high-strength ceramic hand mold, which is prepared from the following raw materials in parts by weight: 20-30 parts of 20-50-mesh white corundum powder, 17-30 parts of 120-mesh white corundum powder, 25-35 parts of 5-micron alpha-alumina powder, 3-21 parts of 0.5-micron alpha-alumina powder, 4-12 parts of aluminate cement and 0.8-1.2 parts of sodium polyacrylate.
On the other hand, the invention also provides a preparation method of the high-precision and high-strength ceramic hand mold, which comprises the following steps:
a) Mixing raw materials: taking 20-30 parts of 20-50-mesh white corundum powder, 17-30 parts of 120-mesh white corundum powder, 25-35 parts of 5 mu m alpha-alumina powder, 3-21 parts of 0.5 mu m alpha-alumina powder and 4-12 parts of high aluminate cement by weight, feeding the materials into a gravity-free mixing device, uniformly mixing, adding 0.8-1.2 parts of sodium polyacrylate and 7 parts of water, and standing after the materials form paste slurry;
b) And (3) vacuum stirring for bubble removal: sending the paste slurry into a vacuum stirrer, starting vacuum stirring, removing bubbles in the slurry, and sealing for storage;
c) Treating the die: uniformly coating dimethyl silicone oil on the surface of the mold cavity for later use;
d) And (3) casting and molding a ceramic hand mold: pouring the slurry subjected to vacuum defoaming into a processed mold cavity, placing the poured mold on a vibration platform, and starting vibration to fully fill the slurry into the mold cavity;
e) Demolding and dewaxing: after the slurry is hardened, removing the mold jacket, and simultaneously sending the molded hand mold blank into a dewaxing room to melt and discharge the paraffin mold in the blank;
f) Treating the surface of the blank: completely immersing the hand mold blank in a silica sol solution with the mass concentration of 30%, vacuumizing the silica sol solution until no bubbles are generated on the surface of the hand mold blank, forming a uniform silica sol layer on the surface of the blank, and taking out the ceramic hand mold blank;
g) Drying the green body: sending the hand mold blank into a drying room, drying and discharging redundant moisture in the blank;
h) Sintering of the green body: and (4) sending the dried hand die blank body into a kiln, and sintering to obtain the finished ceramic hand die.
Preferably, the mixing time in the gravity-free mixing device in step a) is 10 to 30 minutes, and the mixing time after adding the sodium polyacrylate and the water is 15 minutes.
Further preferably, the vacuum degree of the vacuum stirring in the step b) is-0.09 Mpa, and the vacuum stirring time is 15-30 minutes.
Preferably, in the step d), firstly, high-frequency vibration is used, the vibration time is 3-5 minutes, then, low-frequency vibration is adopted, the vibration time is 5-10 minutes, and after the vibration is finished, the pouring gate of the mold is sealed by a preservative film.
Further preferably, after the outer die of the blank body is separated in the step e), the dewaxing temperature is 120 ℃, and the dewaxing time is 60-120 minutes.
Further preferably, in step f), the silica sol is evacuated at a vacuum of-0.09 MPa.
Further preferably, in the step g), the drying temperature of the ceramic hand mold blank is 105 ℃, and the drying time is 3-6 hours.
Further preferably, in the step h), the sintering temperature of the ceramic hand die blank is 800-1050 ℃, and the sintering time is 6-8 hours.
According to the high-precision and high-strength ceramic hand mold provided by the invention, the raw materials adopt white corundum and alpha alumina powder, and although the cost of the raw materials is relatively high, the forming mold is made of polyurethane and paraffin, so that the links of wiping and trimming after the gypsum mold is formed are avoided; the raw materials are subjected to high-temperature treatment, and after the product is fired, the shrinkage is almost 0, so that the firing precision of the product can be effectively guaranteed; meanwhile, the raw materials have extremely high thermal stability, the repeated extremely cold and extremely hot phenomena in the glove production process can be effectively resisted, and the use times of the ceramic hand mold are greatly improved.
The preparation method of the high-precision and high-strength ceramic hand mold provided by the invention gets rid of the links of wiping and trimming blanks and the like in the production process of the traditional clay ceramic hand mold, and greatly improves the production efficiency and the manual error of the product.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a photograph of a finished high precision, high strength ceramic hand mold made in accordance with the present invention;
FIG. 2 is a ray diffraction pattern for providing a high precision, high strength ceramic hand mold according to example 1 of the present disclosure;
FIG. 3 is a scanning electron microscope atlas of a high precision, high strength ceramic hand mold provided in example 1 of the present disclosure.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to limit the scope of the present invention.
Example 1
A high-precision and high-strength ceramic hand die is prepared by the following steps:
a) Mixing main materials: 20 parts of 20-50-mesh white corundum powder, 30 parts of 120-mesh white corundum powder, 25 parts of 5-micron alpha-alumina powder, 21 parts of 0.5-micron alpha-alumina powder and 4 parts of high aluminate cement are taken by weight and sent into a gravity-free mixing device to be started and mixed for 10 minutes, after the raw materials are uniformly mixed, 0.8 part of sodium polyacrylate and 7 parts of water are added to be started and mixed for 15 minutes, and the mixture is used after the raw materials form paste slurry;
b) And (3) vacuum stirring for bubble removal: feeding the paste slurry into a vacuum stirrer, starting vacuum stirring, wherein the vacuum degree needs to reach-0.09 Mpa, the vacuum stirring time is 15 minutes, removing bubbles in the paste slurry, and sealing and storing for later use;
c) Opening a mould: the mold is divided into an inner core and an outer sleeve according to the structure, wherein the outer sleeve mold is made of polyurethane materials, the inner core is made of paraffin materials, and the inner core and the outer sleeve of the mold are combined for later use;
d) Treating the die: uniformly coating dimethyl silicone oil on the surface of the combined mold cavity for later use;
e) And (3) casting and molding a ceramic hand mold: pouring the slurry subjected to vacuum defoaming into a cavity of a processed mold, simultaneously placing the poured mold on a vibration platform, starting vibration, firstly using high-frequency vibration for 3 minutes, then converting into low-frequency vibration for 5 minutes, and fully filling the slurry into the cavity of the mold;
f) Demolding and dewaxing: after the slurry is hardened, removing the outer sleeve of the mold, and simultaneously sending the formed blank into a dewaxing room, wherein the dewaxing temperature is 120 ℃, and the dewaxing time is 60 minutes, so that a paraffin mold in the blank is melted and discharged;
g) Treating the surface of the blank: completely immersing the hand mold blank in a silica sol solution with the content of 30%, vacuumizing the silica sol solution until the vacuum degree of the hand mold blank reaches-0.09 Mpa until no bubbles are generated on the surface of the hand mold blank, forming a uniform silica sol layer on the surface of the blank, and taking out the ceramic hand mold blank;
h) Drying the green body: sending the hand mold green body into a drying room, wherein the drying temperature of the ceramic hand mold green body is 105 ℃, the drying time is 3 hours, and discharging redundant moisture in the green body;
i) Sintering of the green body: and (3) conveying the dried hand die blank body into a kiln, sintering the ceramic hand die blank body at 800 ℃ for 6 hours, and sintering to obtain the finished ceramic hand die.
Example 2
A high-precision and high-strength ceramic hand die is prepared by the following steps:
a) Mixing main materials: according to the weight, 23 parts of 20-50-mesh white corundum powder, 27 parts of 120-mesh white corundum powder, 30 parts of 5-micron alpha-alumina powder, 12 parts of 0.5-micron alpha-alumina powder and 8 parts of high aluminate cement are fed into a gravity-free mixing device, the materials are started to be mixed for 15 minutes, 1 part of sodium polyacrylate and 7 parts of water are added after the materials are uniformly mixed, the materials are started to be mixed for 15 minutes, and the materials are used for standby after being formed into paste slurry;
b) And (3) vacuum stirring for bubble removal: feeding the paste slurry into a vacuum stirrer, starting vacuum stirring, wherein the vacuum degree needs to reach-0.09 Mpa, the vacuum stirring time is 20 minutes, removing bubbles in the paste slurry, and sealing and storing for later use;
c) Opening a mould: the mold is divided into an inner core and an outer sleeve according to the structure, wherein the outer sleeve mold is made of polyurethane materials, and the inner core is made of paraffin materials. Combining the inner core and the outer sleeve of the mold for later use;
d) And (3) processing the die: uniformly coating dimethyl silicone oil on the surface of the combined mold cavity for later use;
e) And (3) casting and molding a ceramic hand mold: pouring the slurry subjected to vacuum defoaming into a cavity of the treated mold, simultaneously placing the poured mold on a vibration platform, starting vibration, firstly using high-frequency vibration for 4 minutes, then converting the vibration into low-frequency vibration for 8 minutes, and fully filling the slurry into the cavity of the mold;
f) Demolding and dewaxing: after the slurry is hardened, removing the outer sleeve of the mold, and simultaneously sending the molded blank into a dewaxing room, wherein the dewaxing temperature is 120 ℃, and the dewaxing time is 90 minutes, so that a paraffin mold in the blank is melted and discharged;
g) Treating the surface of the blank: completely immersing the hand mold blank in a silica sol solution with the content of 30%, vacuumizing the silica sol solution until the vacuum degree of the hand mold blank reaches-0.09 Mpa until no bubbles are generated on the surface of the hand mold blank, forming a uniform silica sol layer on the surface of the blank, and taking out the ceramic hand mold blank;
h) Drying the green body: sending the hand mold green body into a drying room, wherein the drying temperature of the ceramic hand mold green body is 105 ℃, the drying time is 4.5 hours, and discharging redundant moisture in the green body;
i) Sintering of the green body: and (3) conveying the dried hand die blank body into a kiln, sintering the ceramic hand die blank body at the sintering temperature of 950 ℃ for 7 hours, and sintering to obtain the finished ceramic hand die.
Example 3
A high-precision and high-strength ceramic hand die is prepared by the following steps: :
a) Mixing main materials: taking 27 parts of 20-50-mesh white corundum powder, 23 parts of 120-mesh white corundum powder, 35 parts of 5 mu m alpha-alumina powder, 3 parts of 0.5 mu m alpha-alumina powder and 12 parts of high aluminate cement by weight, feeding the materials into a gravity-free mixing device, starting mixing for 20 minutes, uniformly mixing the materials, adding 1.2 parts of sodium polyacrylate and 7 parts of water, starting mixing for 15 minutes, and standing for later use after the materials form paste slurry;
b) And (3) vacuum stirring for bubble removal: feeding the paste slurry into a vacuum stirrer, starting vacuum stirring, wherein the vacuum degree needs to reach-0.09 Mpa, the vacuum stirring time is 30 minutes, removing bubbles in the paste slurry, and sealing and storing for later use;
c) Opening a mould: the mold is divided into an inner core and an outer sleeve according to the structure, wherein the outer sleeve mold is made of polyurethane materials, and the inner core is made of paraffin materials. Combining the inner core and the outer sleeve of the mold for later use;
d) Treating the die: uniformly coating dimethyl silicone oil on the surface of the combined mold cavity for later use;
e) And (3) casting and molding a ceramic hand mold: pouring the slurry subjected to vacuum defoaming into a cavity of a processed mold, simultaneously placing the poured mold on a vibration platform, starting vibration, firstly using high-frequency vibration for 5 minutes, then converting into low-frequency vibration for 10 minutes, and fully filling the slurry into the cavity of the mold;
f) Demolding and dewaxing: after the slurry is hardened, removing the outer sleeve of the mold, and simultaneously sending the formed blank into a dewaxing room, wherein the dewaxing temperature is 120 ℃, and the dewaxing time is 120 minutes, so that a paraffin mold in the blank is melted and discharged;
g) Treating the surface of the blank: completely immersing the hand mold blank in a silica sol solution with the content of 30%, vacuumizing the silica sol solution until the vacuum degree of the hand mold blank reaches-0.09 Mpa until no bubbles are generated on the surface of the hand mold blank, forming a uniform silica sol layer on the surface of the blank, and taking out the ceramic hand mold blank;
h) Drying the green body: sending the hand mold green body into a drying room, wherein the drying temperature of the ceramic hand mold green body is 105 ℃, the drying time is 6 hours, and discharging redundant moisture in the green body;
i) Sintering of a green body: and (3) conveying the dried hand die blank body into a kiln, sintering the ceramic hand die blank body at 1050 ℃ for 8 hours, and sintering to obtain the finished ceramic hand die.
Example 4
A high-precision and high-strength ceramic hand die is prepared by the following steps:
a) Mixing main materials: taking 30 parts of 20-50-mesh white corundum powder, 20 parts of 120-mesh white corundum powder, 30 parts of 5-micron alpha-alumina powder, 12 parts of 0.5-micron alpha-alumina powder and 8 parts of high aluminate cement by weight, feeding the materials into a gravity-free mixing device, starting and mixing for 25 minutes, uniformly mixing the materials, adding 1 part of sodium polyacrylate and 7 parts of water, starting and mixing for 15 minutes, and standing for later use after the materials form paste slurry;
b) And (3) vacuum stirring for bubble removal: feeding the paste slurry into a vacuum stirrer, starting vacuum stirring, wherein the vacuum degree needs to reach-0.09 Mpa, the vacuum stirring time is 20 minutes, removing bubbles in the paste slurry, and sealing and storing for later use;
c) Opening a mould: the mold is divided into an inner core and an outer sleeve according to the structure, wherein the outer sleeve mold is made of polyurethane materials, and the inner core is made of paraffin materials. Combining the inner core and the outer sleeve of the mold for later use;
d) Treating the die: uniformly coating dimethyl silicone oil on the surface of the combined mold cavity for later use;
e) And (3) casting and molding a ceramic hand mold: pouring the slurry subjected to vacuum defoaming into a cavity of the treated mold, simultaneously placing the poured mold on a vibration platform, starting vibration, firstly using high-frequency vibration for 4 minutes, then converting the vibration into low-frequency vibration for 8 minutes, and fully filling the slurry into the cavity of the mold;
f) Demolding and dewaxing: after the slurry is hardened, removing the outer sleeve of the mold, and simultaneously sending the molded blank into a dewaxing room, wherein the dewaxing temperature is 120 ℃, and the dewaxing time is 90 minutes, so that a paraffin mold in the blank is melted and discharged;
g) Treating the surface of the blank: completely immersing the hand mold blank in a silica sol solution with the content of 30%, vacuumizing the silica sol solution until the vacuum degree of the hand mold blank reaches-0.09 Mpa until no bubbles are generated on the surface of the hand mold blank, forming a uniform silica sol layer on the surface of the blank, and taking out the ceramic hand mold blank;
h) Drying the green body: sending the hand mold green body into a drying room, wherein the drying temperature of the ceramic hand mold green body is 105 ℃, the drying time is 4.5 hours, and discharging redundant moisture in the green body;
i) Sintering of the green body: and (3) feeding the dried hand die blank body into a kiln, sintering the ceramic hand die blank body at 950 ℃ for 7 hours, and sintering to obtain the finished ceramic hand die.
Example 5
A high-precision and high-strength ceramic hand die is prepared by the following steps:
a) Mixing main materials: taking 33 parts of 20-50-mesh white corundum powder, 17 parts of 120-mesh white corundum powder, 28 parts of 5-micron alpha-alumina powder, 18 parts of 0.5-micron alpha-alumina powder and 4 parts of high aluminate cement by weight, feeding the materials into a gravity-free mixing device, starting and mixing for 30 minutes, uniformly mixing the materials, adding 0.8 part of sodium polyacrylate and 7 parts of water, starting and mixing for 15 minutes, and standing for later use after the materials form paste slurry;
b) And (3) vacuum stirring for bubble removal: feeding the paste slurry into a vacuum mixer, starting vacuum stirring, wherein the vacuum degree needs to reach-0.09 Mpa, the vacuum stirring time is 15 minutes, removing bubbles in the paste slurry, and sealing and storing for later use;
c) Opening a mould: the mold is divided into an inner core and an outer sleeve according to the structure, wherein the outer sleeve mold is made of polyurethane materials, and the inner core is made of paraffin materials. Combining the inner core and the outer sleeve of the mold for later use;
d) Treating the die: uniformly coating dimethyl silicone oil on the surface of the combined mold cavity for later use;
e) And (3) casting and molding a ceramic hand mold: pouring the slurry subjected to vacuum defoaming into a cavity of a processed mold, simultaneously placing the poured mold on a vibration platform, starting vibration, firstly using high-frequency vibration for 3 minutes, then converting into low-frequency vibration for 5 minutes, and fully filling the slurry into the cavity of the mold;
f) Demolding and dewaxing: after the slurry is hardened, removing the outer sleeve of the mold, and simultaneously sending the molded blank into a dewaxing room, wherein the dewaxing temperature is 120 ℃, and the dewaxing time is 60 minutes, so that a paraffin mold in the blank is melted and discharged;
g) Treating the surface of the blank: completely immersing the hand mold blank in a silica sol solution with the content of 30%, vacuumizing the silica sol solution until the vacuum degree of the hand mold blank reaches-0.09 Mpa until no bubbles are generated on the surface of the hand mold blank, forming a uniform silica sol layer on the surface of the blank, and taking out the ceramic hand mold blank;
h) Drying the blank body: sending the hand mold green body into a drying room, wherein the drying temperature of the ceramic hand mold green body is 105 ℃, the drying time is 3 hours, and discharging redundant moisture in the green body;
i) Sintering of the green body: and (3) conveying the dried hand die blank body into a kiln, sintering the ceramic hand die blank body at 800 ℃ for 6 hours, and sintering to obtain the finished ceramic hand die.
Example 6
The ceramic hand models prepared in examples 1 to 5 and the existing clay hand models are subjected to performance tests, and the specific test results are as follows:
other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It is to be understood that the present invention is not limited to what has been described above, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (8)
1. A preparation method of a high-precision and high-strength ceramic hand mold is characterized by comprising the following steps:
a) Mixing raw materials: taking 20-30 parts of 20-50-mesh white corundum powder, 17-30 parts of 120-mesh white corundum powder, 25-35 parts of 5 mu m alpha-alumina powder, 3-21 parts of 0.5 mu m alpha-alumina powder and 4-12 parts of high aluminate cement by weight, feeding the materials into a gravity-free mixing device, uniformly mixing, adding 0.8-1.2 parts of sodium polyacrylate and 7 parts of water, and standing after the materials form paste slurry;
b) And (3) vacuum stirring for bubble removal: sending the paste slurry into a vacuum stirrer, starting vacuum stirring, removing bubbles in the slurry, and sealing for storage;
c) Treating the die: uniformly coating dimethyl silicone oil on the surface of the mold cavity for later use;
d) And (3) casting and molding a ceramic hand mold: pouring the slurry subjected to vacuum defoaming into a processed mold cavity, placing the poured mold on a vibration platform, and starting vibration to fully fill the slurry into the mold cavity;
e) Demolding and dewaxing: after the slurry is hardened, removing the mold jacket, and simultaneously sending the molded hand mold blank into a dewaxing room to melt and discharge the paraffin mold in the blank;
f) Treating the surface of the blank: completely immersing the hand mold blank in a silica sol solution with the mass concentration of 30%, vacuumizing the silica sol solution until no bubbles are generated on the surface of the hand mold blank, forming a uniform silica sol layer on the surface of the blank, and taking out the ceramic hand mold blank;
g) Drying the green body: sending the hand mold blank into a drying room, drying and discharging redundant moisture in the blank;
h) Sintering of the green body: and (4) sending the dried hand die blank into a kiln, and sintering to obtain the finished ceramic hand die.
2. The method for preparing a high-precision, high-strength ceramic hand mold according to claim 1, wherein the mixing time in the gravity-free mixing device in step a) is 10 to 30 minutes, and the mixing time after adding the sodium polyacrylate and the water is 15 minutes.
3. The method for preparing a high-precision and high-strength ceramic hand mold according to claim 1, wherein the vacuum degree of the vacuum stirring in the step b) is-0.09 Mpa, and the vacuum stirring time is 15-30 minutes.
4. The method for preparing a high-precision and high-strength ceramic hand mold according to claim 1, wherein in step d), high-frequency vibration is used for 3-5 minutes, and then low-frequency vibration is used for 5-10 minutes, and after the vibration is finished, a pouring gate of the mold is sealed by a preservative film.
5. The method for preparing a high-precision and high-strength ceramic hand mold according to claim 1, wherein the dewaxing temperature is 120 ℃ and the dewaxing time is 60-120 minutes after the green body outer mold is separated in step e).
6. The method for preparing a high-precision and high-strength ceramic hand mold according to claim 1, wherein in the step f), the silica sol is vacuumized, and the degree of vacuum is-0.09 Mpa.
7. The method for preparing a high-precision and high-strength ceramic hand mold according to claim 1, wherein in the step g), the drying temperature of the ceramic hand mold blank is 105 ℃ and the drying time is 3-6 hours.
8. The method for preparing a high-precision and high-strength ceramic hand mold according to claim 1, wherein in the step h), the sintering temperature of the ceramic hand mold blank is 800-1050 ℃, and the sintering time is 6-8 hours.
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