CN110078477B - Magnesium oxide ceramic core and preparation method thereof - Google Patents
Magnesium oxide ceramic core and preparation method thereof Download PDFInfo
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- CN110078477B CN110078477B CN201910342863.XA CN201910342863A CN110078477B CN 110078477 B CN110078477 B CN 110078477B CN 201910342863 A CN201910342863 A CN 201910342863A CN 110078477 B CN110078477 B CN 110078477B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/6303—Inorganic additives
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3232—Titanium oxides or titanates, e.g. rutile or anatase
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention discloses a magnesium oxide ceramic core which is mainly prepared from 100-110 parts by weight of magnesium oxide and 2-10 parts by weight of titanium dioxide. The preparation method of the magnesia ceramic core comprises the steps of pressing and forming the magnesia and the titanium dioxide, and then sintering to obtain the magnesia ceramic core. Compared with the prior art, the invention adopts titanium dioxide with better sintering promoting effect as the mineralizer of the magnesium-based ceramic core, the core has good dissolution and removal performance, and in addition, the final sintering temperature and the content of the titanium dioxide can be adjusted according to the requirement on the performance of the core in the actual use process, so as to adjust the performance of the core.
Description
Technical Field
The invention relates to a magnesium oxide ceramic core and a preparation method thereof, belonging to the technical field of ceramic cores.
Background
With the continuous development of the manufacturing industry, the requirement on the reliability of the casting is continuously improved, the casting design is more and more functionalized, and the function realized by combining a plurality of parts is gradually realized by adopting a single part, so that the complexity of the casting is improved. When parts with structures of complex shapes, special-shaped inner cavities and the like are produced, casting has the advantages which are not possessed by other preparation processes, and even the casting is inevitably selected.
In recent years, castings of various alloy steels are more widely used, and parts of the castings have complex inner cavity structures, so that difficulties are brought to casting process design and casting production. At present, ceramic core materials for high-temperature alloys are widely applied, and the research and application are mostly carried out on silica-based cores, but when the silica-based cores are applied to alloy steel castings, silica can react with certain metal elements in the alloys to generate pores, sand sticking and the like on the interface between ceramics and metal, so that the surface quality of the castings is reduced, and the cores are difficult to escape.
The ceramic core taking magnesium oxide as a base material has high mechanical strength, refractoriness and chemical stability, and simultaneously has good solubility. The magnesium oxide ceramic core has the service temperature as high as 1600 ℃, does not react with casting metal under the high-temperature condition, has smooth casting surface and small surface roughness, and is suitable for casting alloy containing Al, Hf and C, stainless steel and other alloy steels. The adoption of acetic acid for dissolving and depoling has the advantages of short depoling time, simple depoling equipment, small corrosion of depoling liquid to castings, safety, reliability and the like. On the other hand, the thermal expansion of the magnesium oxide is very close to that of the alloy, and the thermal expansion matching is good, so that the thermal cracking defect cannot be generated when the magnesium oxide ceramic core is used for pouring the thin-wall alloy steel casting with the extremely complex inner cavity shape.
According to material property analysis, the alloy steel ceramic core manufactured by magnesium oxide has obvious advantages. However, the prior researches are few, and a small amount of research work is carried out, so that the magnesium oxide ceramic core has the problems of low strength and difficult core release.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the problems, the invention aims to provide a magnesium oxide ceramic core and a preparation method thereof.
The technical scheme is as follows: in order to achieve the purpose, the invention provides the following technical scheme:
a magnesia ceramic core is mainly made of 100-110 parts by weight of magnesia and 2-10 parts by weight of titanium dioxide.
Preferably, the method comprises the following steps:
the magnesium oxide and the titanium dioxide are both in powder form, and the powder particle size of the magnesium oxide is preferably 200 meshes.
The preparation method of the magnesia ceramic core comprises the steps of pressing and forming the magnesia and the titanium dioxide, and then sintering to obtain the magnesia ceramic core.
Preferably, the magnesium oxide and the titanium dioxide are mixed, a polyvinyl alcohol solution is added to the mixture to be uniformly ground, the mixture is pressed and formed, demolding is carried out to obtain a green body, and finally the pressed green body is sintered according to a set heating curve to obtain the magnesium oxide ceramic core.
Further preferably, the method comprises the following steps:
(1) drying magnesium oxide and titanium dioxide at the temperature of 110-120 ℃ for 2-3 h, mixing in proportion, and ball-milling at the rotating speed of 400r/min for 1.5-2 h to obtain a mixture;
(2) adding a polyvinyl alcohol solution into the mixture, and uniformly grinding;
(3) keeping the pressure of the ground mixture at 8-9 MPa for 120-150 s, pressing and molding, and demolding to obtain a green body;
(4) and sintering the pressed green body at 1250-1500 ℃ for 0.5-2 hours to obtain the core.
Preferably, the concentration of the polyvinyl alcohol solution is 5% (mass concentration), and the weight ratio of the polyvinyl alcohol solution to the magnesium oxide is 6: (100-110).
The technical effects are as follows: compared with the prior art, the invention adopts titanium dioxide with better sintering promoting effect as the mineralizer of the magnesium-based ceramic core, the core has good dissolution and removal performance, and in addition, the final sintering temperature and the content of the titanium dioxide can be adjusted according to the requirement on the performance of the core in the actual use process, so as to adjust the performance of the core.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples.
The bending strength of the samples in the following examples is measured by a microcomputer-controlled electronic universal tester.
Example 1:
(1) putting the required raw materials into an oven, and drying at the temperature of 120 ℃ for 2 h;
(2) weighing a certain amount of magnesium oxide and titanium dioxide, wherein 100 parts by weight (200 meshes) of magnesium oxide powder and 2 parts by weight of titanium dioxide powder are weighed;
(3) putting the weighed magnesium oxide powder and titanium dioxide into a ball milling tank of a planetary ball mill, and carrying out ball milling for 2 hours at the rotating speed of 400 r/min;
(4) preparing 6 parts by weight of 5% polyvinyl alcohol solution, putting the mixture into a mortar, adding the polyvinyl alcohol solution, and uniformly grinding;
(5) and (3) placing the uniformly ground mixture into a mold, maintaining the pressure for 120s under the pressure of 9MPa, and then demolding to take out the green body.
(6) And (3) placing the pressed green body into a box furnace, and sintering for half an hour at 1320 ℃ according to a set sintering curve to obtain a core, wherein the bending strength is 30 MPa.
Example 2:
(1) putting the required raw materials into an oven, and drying at the temperature of 120 ℃ for 2 h;
(2) weighing a certain amount of magnesium oxide and titanium dioxide, wherein 105 parts by weight (200 meshes) of magnesium oxide powder and 5 parts by weight of titanium dioxide powder are weighed;
(3) putting the weighed magnesium oxide powder and titanium dioxide into a ball milling tank of a planetary ball mill, and carrying out ball milling for 2 hours at the rotating speed of 400 r/min;
(4) preparing 6 parts by weight of 5% polyvinyl alcohol solution, putting the mixture into a mortar, adding the polyvinyl alcohol solution, and uniformly grinding;
(5) and (3) placing the uniformly ground mixture into a mold, maintaining the pressure for 120s under the pressure of 9MPa, and then demolding to take out the green body.
(6) And (3) placing the pressed green body into a box type furnace, and sintering for half an hour at 1250 ℃ according to a set sintering curve to obtain a mold core, wherein the bending strength is 10 MPa.
Example 3:
(1) putting the required raw materials into an oven, and drying at the temperature of 120 ℃ for 2 h;
(2) weighing a certain amount of magnesium oxide and titanium dioxide, wherein 105 parts by weight (200 meshes) of magnesium oxide powder and 6 parts by weight of titanium dioxide powder are weighed;
(3) putting the weighed magnesium oxide powder and titanium dioxide into a ball milling tank of a planetary ball mill, and carrying out ball milling for 2 hours at the rotating speed of 400 r/min;
(4) preparing 6 parts by weight of 5% polyvinyl alcohol solution, putting the mixture into a mortar, adding the polyvinyl alcohol solution, and uniformly grinding;
(5) and (3) placing the uniformly ground mixture into a mold, maintaining the pressure for 120s under the pressure of 9MPa, and then demolding to take out the green body.
(6) And (3) placing the pressed green body into a box type furnace, and sintering for half an hour at 1500 ℃ according to a set sintering curve to obtain a core, wherein the bending strength is 53 MPa.
Example 4:
(1) putting the required raw materials into an oven, and drying at the temperature of 120 ℃ for 2 h;
(2) weighing a certain amount of magnesium oxide and titanium dioxide, wherein 110 parts by weight (200 meshes) of magnesium oxide powder and 6 parts by weight of titanium dioxide powder are weighed;
(3) putting the weighed magnesium oxide powder and titanium dioxide into a ball milling tank of a planetary ball mill, and carrying out ball milling for 2 hours at the rotating speed of 400 r/min;
(4) preparing 6 parts by weight of 5% polyvinyl alcohol solution, putting the mixture into a mortar, adding the polyvinyl alcohol solution, and uniformly grinding;
(5) and (3) placing the uniformly ground mixture into a mold, maintaining the pressure for 120s under the pressure of 9MPa, and then demolding to take out the green body.
(6) And (3) placing the pressed green body into a box type furnace, and sintering for 2 hours at 1280 ℃ according to a set sintering curve to obtain a core, wherein the bending strength is 22 MPa.
Example 5:
(1) putting the required raw materials into an oven, and drying at the temperature of 120 ℃ for 2 h;
(2) weighing a certain amount of magnesium oxide and titanium dioxide, wherein 102 parts by weight (200 meshes) of magnesium oxide powder and 9 parts by weight of titanium dioxide powder;
(3) putting the weighed magnesium oxide powder and titanium dioxide into a ball milling tank of a planetary ball mill, and carrying out ball milling for 2 hours at the rotating speed of 400 r/min;
(4) preparing 6 parts by weight of 5% polyvinyl alcohol solution, putting the mixture into a mortar, adding the polyvinyl alcohol solution, and uniformly grinding;
(5) and (3) placing the uniformly ground mixture into a mold, maintaining the pressure for 120s under the pressure of 9MPa, and then demolding to take out the green body.
(6) And (3) placing the pressed green body into a box furnace, and sintering for half an hour at 1320 ℃ according to a set sintering curve to obtain a core, wherein the bending strength is 40 MPa.
Claims (1)
1. The preparation method of the magnesia ceramic core is characterized in that the magnesia ceramic core is prepared by 100-110 parts by weight of magnesia and 2-10 parts by weight of titanium dioxide; mixing the magnesium oxide and the titanium dioxide, adding a polyvinyl alcohol solution, grinding uniformly, pressing and molding the mixture, demolding to obtain a green body, and finally sintering the pressed green body according to a set temperature rise curve to obtain the magnesium oxide ceramic core; the method comprises the following steps:
(1) drying magnesium oxide and titanium dioxide at the temperature of 110-120 ℃ for 2-3 h, mixing in proportion, and ball-milling at the rotating speed of 400r/min for 1.5-2 h to obtain a mixture;
(2) adding a polyvinyl alcohol solution into the mixture, and uniformly grinding;
(3) keeping the pressure of the ground mixture at 8-9 MPa for 120-150 s, pressing and molding, and demolding to obtain a green body;
(4) sintering the pressed green body at 1250-1500 ℃ for 0.5-2 hours to obtain the mold core;
the magnesium oxide and titanium dioxide are both in powder form; the powder granularity of the magnesium oxide is 200 meshes; the concentration of the polyvinyl alcohol solution is 5%, and the weight ratio of the polyvinyl alcohol solution to the magnesium oxide is 6: (100-110).
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| CN111153629A (en) * | 2020-04-02 | 2020-05-15 | 佛山市恒之芯复合材料有限公司 | Manufacturing process of sintering-free ceramic core |
| CN113149698A (en) * | 2021-04-25 | 2021-07-23 | 东南大学 | Magnesium oxide ceramic core with good dissolution collapsibility and preparation method thereof |
| CN115138846B (en) * | 2022-09-02 | 2022-11-25 | 中国航发北京航空材料研究院 | Preparation method of sheath dual core for powder metallurgy |
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| US20150078958A1 (en) * | 2013-09-18 | 2015-03-19 | General Electric Company | Ceramic core compositions, methods for making cores, methods for casting hollow titanium-containing articles, and hollow titanium-containing articles |
| CN104072107A (en) * | 2014-05-24 | 2014-10-01 | 芜湖浙鑫新能源有限公司 | Modified magnesium oxide based ceramic core |
| CN104070141A (en) * | 2014-05-24 | 2014-10-01 | 芜湖浙鑫新能源有限公司 | Rare earth coated and magnesium oxide based ceramic core |
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