CN107042309B - Water-soluble mold core part and preparation method thereof - Google Patents
Water-soluble mold core part and preparation method thereof Download PDFInfo
- Publication number
- CN107042309B CN107042309B CN201710132911.3A CN201710132911A CN107042309B CN 107042309 B CN107042309 B CN 107042309B CN 201710132911 A CN201710132911 A CN 201710132911A CN 107042309 B CN107042309 B CN 107042309B
- Authority
- CN
- China
- Prior art keywords
- water
- soluble
- chloride
- carbonate
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/115—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by spraying molten metal, i.e. spray sintering, spray casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/03—Press-moulding apparatus therefor
-
- 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
- B28B1/24—Producing shaped prefabricated articles from the material by injection moulding
-
- 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
- B28B7/28—Cores; Mandrels
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Ceramic Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention provides a water-soluble core part and a preparation method thereof, wherein the water-soluble core part comprises the following components: the water-soluble chloride ceramic powder comprises, by weight, 40-85% of water-soluble chloride, 10-30% of water-soluble carbonate and 5-30% of ceramic powder. The preparation method of the water-soluble core component comprises the steps of 1) mixing and cooling water-soluble chloride, water-soluble carbonate, ceramic powder and an organic binder on a mixing roll to obtain a mixture, wherein the mixing temperature is 150-175 ℃; 2) crushing the mixture to be less than 5mm to obtain mixture particles; 3) performing injection molding on the mixture particles through an injection molding machine to obtain a core blank, wherein the molding temperature is 155-180 ℃; 4) degreasing the core blank with an organic solvent, drying, and sintering to obtain the water-soluble core member.
Description
Technical Field
The invention belongs to the technical field of injection molding, and particularly relates to a water-soluble mold core part and a preparation method thereof.
Background
In the field of powder injection molding, inner holes of parts are mainly realized by a core-pulling mechanism of a mold. The complex shape of the inner bore often requires a very complex core-pulling mechanism, resulting in a bulky and bulky injection molding die and a high manufacturing cost. Some inner hole structures can not be directly realized even by a forming means and are obtained by later mechanical processing.
Disclosure of Invention
The inventor of the invention has repeatedly studied and found that if the water-soluble core is used for designing and manufacturing a mold for injection molding, the inner hole with a complex shape is realized by the water-soluble core with a complex shape, and great convenience is brought to the powder injection molding manufacturing of parts with complex inner hole structures.
However, water-soluble cores are currently used mainly in the field of metal casting, and are generally produced by a melt casting method, a press sintering method, and a bonding method. These conventional techniques do not allow for the rapid, low-cost manufacture of complex-shaped cores.
In view of the above problems, the present invention is directed to provide a water-soluble core part with high efficiency, low cost, complex shape and high precision for a mold for ceramic powder molding and metal powder injection molding and a preparation technique thereof, which is suitable for manufacturing parts with complex-shaped inner holes, simplifies the mold structure, improves the production efficiency, and reduces the production cost.
According to an aspect of the invention there is provided a water soluble core component having a raw material composition comprising: the water-soluble chloride ceramic powder comprises, by weight, 40-85% of water-soluble chloride, 10-30% of water-soluble carbonate and 5-30% of ceramic powder.
According to some embodiments of the invention, the water soluble chloride is one, two or a combination of three of sodium chloride, potassium chloride, calcium chloride.
According to some embodiments of the invention, the water soluble carbonate is one or a combination of potassium carbonate and sodium carbonate.
According to some embodiments of the invention, the ceramic powder comprises alumina, zirconia, silica, or a combination thereof.
According to another aspect of the invention there is provided a method of making a water soluble core part comprising the steps of:
1) mixing and cooling water-soluble chloride, water-soluble carbonate, ceramic powder and an organic binder on a mixing roll to obtain a mixture, wherein the mixing temperature is 150-175 ℃;
2) crushing the mixture to be less than 5mm to obtain mixture particles;
3) performing injection molding on the mixture particles through an injection molding machine to obtain a core blank, wherein the molding temperature is 155-180 ℃;
4) degreasing the core blank by using an organic solvent, drying the core blank in an oven, and sintering the core blank to obtain the water-soluble core component, wherein the sintering temperature is 450-550 ℃.
According to some embodiments of the invention, the water soluble chloride is one, two or a combination of three of sodium chloride, potassium chloride, calcium chloride.
According to some embodiments of the invention, the water soluble carbonate is one or a combination of potassium carbonate and sodium carbonate.
According to some embodiments of the invention, the ceramic powder is alumina, zirconia, silica, or a combination thereof.
According to some embodiments of the invention, the total weight of water-soluble chloride, water-soluble carbonate and the ceramic powder: the total weight ratio of the organic binder is 3-9: 1.
According to some embodiments of the invention, the organic binder comprises polyethylene, polypropylene, paraffin wax and stearic acid, wherein the weight ratio of polyethylene: polypropylene: paraffin wax: the mass ratio of stearic acid is 1:1 (3-6) to 0.1-0.5.
According to some embodiments of the invention, in step 4), the organic solvent is a solution of kerosene, n-heptane or dichloromethane, and the degreasing is in particular: soaking the core blank in the organic solvent.
Optionally, the soaking time is 10-24 hours, and the soaking temperature is 35-45 ℃.
According to some embodiments of the invention, in step 4), the drying is specifically drying in an oven for 10-24 hours at an oven temperature of 45-55 ℃.
According to some embodiments of the invention, in step 4), the sintering schedule is increased from room temperature to the sintering temperature at a temperature increasing rate of 5-10 ℃/h, and the temperature is maintained at the sintering temperature for 1-4 hours.
Advantageous effects of the invention
According to the water-soluble core part and the preparation method thereof provided by the embodiment of the invention, the water-soluble core part with a complex shape, high strength and precise size can be prepared quickly at low cost, and the water-soluble core part can be used for an injection molding process of a part with a complex inner hole structure.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Example 1
A water soluble core component is produced according to the following steps:
(1) weighing the following raw materials in percentage by mass:
85% of sodium chloride;
10% of potassium carbonate;
5% of ceramic powder.
In this example, potassium carbonate and sodium chloride were sieved through a 100 mesh sieve, and ceramic powder was sieved through a 200 mesh sieve. The ceramic powder is alumina powder.
The organic binder is a combination of polyethylene, polypropylene, paraffin and stearic acid, wherein the weight ratio of polyethylene: polypropylene: paraffin wax: stearic acid is 1:1:6: 0.5.
Total weight of potassium carbonate, sodium chloride and ceramic powder: the total weight of the organic binder was 9: 1.
(2) Mixing the raw materials and the organic binder on a mixing roll, wherein the mixing temperature is 150 ℃, and the mixed mixture is crushed to be less than 5 mm.
(3) And (3) injection molding the mixture on an injection molding machine to form a green body with a certain shape, wherein the injection molding temperature is 155 ℃.
(4) The core obtained by injection molding was degreased in kerosene at a degreasing temperature of 45 ℃ for 24 hours. Then dried in an oven for 24 hours at a drying temperature of 45 ℃.
(5) And sintering the dried core blank in a sintering furnace, wherein the sintering system is that the temperature is raised to 450 ℃ from 5 ℃ per hour at room temperature, and the temperature is kept at 450 ℃ for 4 hours to obtain the water-soluble core part.
Example 2
A water soluble core component is produced according to the following steps:
(1) weighing the following raw materials in percentage by mass:
55% of calcium chloride;
20% of sodium carbonate;
25% of ceramic powder.
In this example, potassium carbonate and sodium chloride were sieved through a 100 mesh sieve, and ceramic powder was sieved through a 200 mesh sieve. The ceramic powder is alumina powder and silicon dioxide powder in a weight ratio of 1: 1. The organic binder is a combination of polyethylene, polypropylene, paraffin and stearic acid, and the total weight of potassium carbonate, sodium chloride and ceramic powder is as follows: the total weight of the organic binder is 3:1, polyethylene: polypropylene: paraffin wax: stearic acid is 1:1:4: 0.1.
(2) Mixing the above raw materials and organic binder in a mixer at 175 deg.C, and crushing the mixture to below 5 mm.
(3) And (3) injection molding the mixture on an injection molding machine to form a green body with a certain shape, wherein the injection molding temperature is 180 ℃.
(4) The core obtained by injection molding was degreased in n-heptane at a degreasing temperature of 40 ℃ for 15 hours. Then dried in an oven for 15 hours at a drying temperature of 50 ℃.
(5) And sintering the dried core blank in a sintering furnace, wherein the sintering system is that the temperature is raised to 550 ℃ from 8 ℃ per hour at room temperature, and the temperature is kept at 550 ℃ for 1 hour.
Example 3
A water soluble core component is produced according to the following steps:
(1) weighing the following raw materials in percentage by mass:
40% of potassium chloride;
30% of potassium carbonate;
30% of ceramic powder.
In this example, potassium carbonate and sodium chloride were sieved through a 100 mesh sieve, and ceramic powder was sieved through a 200 mesh sieve. The ceramic powder is alumina powder and zirconia powder with the weight ratio of 1: 1. The organic binder is a combination of polyethylene, polypropylene, paraffin and stearic acid, and the total weight of potassium carbonate, sodium chloride and ceramic powder is as follows: the total weight of the organic binder is 7:1, polyethylene: polypropylene: paraffin wax: stearic acid is 1:1:3: 0.4.
(2) Mixing the raw materials and the organic binder on a mixing roll, wherein the mixing temperature is 160 ℃, and the mixed mixture is crushed to be less than 5 mm.
(3) And (3) injection molding the mixture on an injection molding machine to form a green body with a certain shape, wherein the injection molding temperature is 170 ℃.
(4) The core obtained by injection molding was degreased in dichloromethane at a temperature of 35 ℃ for 10 hours. Then dried in an oven for 10 hours at a drying temperature of 55 ℃.
(5) And sintering the dried core blank in a sintering furnace, wherein the sintering system is that the temperature is increased to 500 ℃ from 10 ℃ per hour at room temperature, and the temperature is kept at 500 ℃ for 3 hours.
Example 4:
a water soluble core component is produced according to the following steps:
(1) weighing the following raw materials in percentage by mass:
65% of sodium chloride; 25 percent of potassium chloride
10% of potassium carbonate;
5% of ceramic powder.
In this example, potassium carbonate, potassium chloride and sodium chloride were sieved through a 100 mesh sieve, and ceramic powder was sieved through a 200 mesh sieve. The ceramic powder is zirconia.
The rest of the procedure was the same as in example 1.
Example 5:
a water soluble core component is produced according to the following steps:
(1) weighing the following raw materials in percentage by mass:
65% of sodium chloride; 20% of potassium chloride; 5% of calcium chloride;
10% of potassium carbonate;
5% of ceramic powder.
In this example, potassium carbonate, potassium chloride, sodium chloride, and calcium chloride were sieved through a 100 mesh sieve, and ceramic powder was sieved through a 200 mesh sieve. The ceramic powder is prepared from the following components in percentage by weight of 1:1 zirconia and silica powder.
The rest of the procedure was the same as in example 1.
Example 6:
a water soluble core component is produced according to the following steps:
(1) weighing the following raw materials in percentage by mass:
20% of sodium chloride; 20% of calcium chloride;
15% of potassium carbonate;
15% of sodium carbonate;
30% of ceramic powder.
In this example, potassium carbonate and sodium chloride were sieved through a 100 mesh sieve, and ceramic powder was sieved through a 200 mesh sieve. The ceramic powder is silicon dioxide powder. The rest of the procedure was the same as in example 3.
According to the above embodiments, a water-soluble core member having a complicated shape, high strength, and precise dimensions, which can be used for an injection molding process of a member having a complicated inner hole structure, can be manufactured quickly and at low cost.
Claims (6)
1. A water soluble core component characterized by a raw material composition comprising: water-soluble chloride, water-soluble carbonate and ceramic powder,
the ceramic powder comprises, by weight, 100% of water-soluble chloride, 40-55% of water-soluble carbonate, 20-30% of water-soluble carbonate and 25-30% of ceramic powder, wherein the water-soluble chloride is one, two or a combination of three of alumina powder, zirconia powder and silica powder, the water-soluble chloride is one, two or a combination of three of sodium chloride, potassium chloride and calcium chloride, and the water-soluble carbonate is one or a combination of two of potassium carbonate and sodium carbonate.
2. A method of making a water soluble core component comprising the steps of:
1) mixing water-soluble chloride, water-soluble carbonate, ceramic powder and an organic binder on a mixing roll, and cooling to obtain a mixture, wherein the mixing temperature is 150-175 ℃, and the total weight of the water-soluble chloride, the water-soluble carbonate and the ceramic powder is as follows: the total weight ratio of the organic binder is 3-9: 1,
wherein, the total weight of the water-soluble chloride, the water-soluble carbonate and the ceramic powder is 100 percent, the weight percentage of the water-soluble chloride is 40 to 55 percent, the weight percentage of the water-soluble carbonate is 20 to 30 percent, the weight percentage of the ceramic powder is 25 to 30 percent,
the ceramic powder is one, two or three of alumina powder, zirconia powder and silicon dioxide powder,
the water-soluble chloride is one, two or three of sodium chloride, potassium chloride and calcium chloride,
the water-soluble carbonate is one or the combination of two of potassium carbonate and sodium carbonate;
2) crushing the mixture to be less than 5mm to obtain mixture particles;
3) performing injection molding on the mixture particles through an injection molding machine to obtain a core blank, wherein the molding temperature is 155-180 ℃;
4) degreasing the core blank by using an organic solvent, drying the core blank in an oven, and sintering the core blank to obtain the water-soluble core component, wherein the sintering temperature is 450-550 ℃, and the organic binder comprises polyethylene, polypropylene, paraffin and stearic acid, wherein the weight ratio of polyethylene: polypropylene: paraffin wax: the mass ratio of stearic acid is 1:1 (3-6) to 0.1-0.5.
3. The preparation method according to claim 2, wherein in step 4), the organic solvent is a solution of kerosene, n-heptane or dichloromethane, and the degreasing is specifically: soaking the core blank in the organic solvent.
4. The method of claim 3, wherein the soaking time is 10 to 24 hours and the soaking temperature is 35 to 45 ℃.
5. The preparation method according to claim 2, wherein in the step 4), the drying is specifically drying in an oven for 10-24 hours at an oven temperature of 45-55 ℃.
6. The method according to claim 2, wherein in the step 4), the sintering schedule is a temperature rise from room temperature to the sintering temperature at a temperature rise rate of 5-10 ℃/h, and the temperature is maintained at the sintering temperature for 1-4 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710132911.3A CN107042309B (en) | 2017-03-07 | 2017-03-07 | Water-soluble mold core part and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710132911.3A CN107042309B (en) | 2017-03-07 | 2017-03-07 | Water-soluble mold core part and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107042309A CN107042309A (en) | 2017-08-15 |
| CN107042309B true CN107042309B (en) | 2019-12-20 |
Family
ID=59545162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710132911.3A Active CN107042309B (en) | 2017-03-07 | 2017-03-07 | Water-soluble mold core part and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107042309B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107737880A (en) * | 2017-09-01 | 2018-02-27 | 东风精密铸造安徽有限公司 | A kind of Water-soluble ceramic core and preparation method thereof |
| CN107971451A (en) * | 2017-11-02 | 2018-05-01 | 深圳市爱能森科技有限公司 | A kind of soluble core based on ternary molten salt system and preparation method and application |
| CN108484178A (en) * | 2018-03-01 | 2018-09-04 | 辽宁航安特铸材料有限公司 | A kind of preparation method and applications of Water-soluble ceramic core plasticizer |
| CN108515147B (en) * | 2018-04-28 | 2020-01-10 | 安徽工业大学 | Rapid forming method of infrared pre-cured water-soluble salt core |
| CN109773948A (en) * | 2019-03-29 | 2019-05-21 | 深圳市宏通新材料有限公司 | Salt mould inner core material and manufacturing method of ceramic for ceramic injection forming |
| CN115321826B (en) * | 2021-05-10 | 2024-04-12 | 中国科学院上海硅酸盐研究所 | Water-soluble glass ceramic-based core and preparation method thereof |
| CN114368059B (en) * | 2022-01-12 | 2022-11-04 | 陕西固勤材料技术有限公司 | Preparation method of large high-temperature pipe |
| GB2620549A (en) * | 2022-06-27 | 2024-01-17 | The Manufacturing Tech Centre Limited | A method for creating an object |
| CN115710119B (en) * | 2022-11-29 | 2023-10-31 | 湖南圣瓷新材料有限公司 | Preparation method of ceramic arm based on water-based injection molding process |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4629708A (en) * | 1983-05-20 | 1986-12-16 | Doulton Industrial Products Limited | Moulding |
| JP2007136912A (en) * | 2005-11-21 | 2007-06-07 | Toray Ind Inc | Manufacturing method of ceramic molding, and manufacturing method of ceramic sintered article using the molding |
| CN102093040A (en) * | 2010-12-07 | 2011-06-15 | 山东理工大学 | Composite ceramic mold core for water pump impeller and preparation method thereof |
| CN102786295A (en) * | 2012-08-06 | 2012-11-21 | 江苏大学 | Water-soluble ceramic core and preparation method thereof |
| JP2014034707A (en) * | 2012-08-09 | 2014-02-24 | Castem Co Ltd | Method for producing metal powder sintered compact having hollow part |
| CN103601474A (en) * | 2013-10-24 | 2014-02-26 | 江苏大学 | Water-soluble ceramic core for high-temperature alloy monocrystal blades and preparation method of core |
| CN105693254A (en) * | 2016-02-03 | 2016-06-22 | 中国航空工业集团公司北京航空材料研究院 | Water-soluble ceramic core material and preparation method thereof |
| CN105798308A (en) * | 2016-03-29 | 2016-07-27 | 齐鲁工业大学 | Water-soluble salt core type metal powder injection molding technology |
-
2017
- 2017-03-07 CN CN201710132911.3A patent/CN107042309B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4629708A (en) * | 1983-05-20 | 1986-12-16 | Doulton Industrial Products Limited | Moulding |
| JP2007136912A (en) * | 2005-11-21 | 2007-06-07 | Toray Ind Inc | Manufacturing method of ceramic molding, and manufacturing method of ceramic sintered article using the molding |
| CN102093040A (en) * | 2010-12-07 | 2011-06-15 | 山东理工大学 | Composite ceramic mold core for water pump impeller and preparation method thereof |
| CN102786295A (en) * | 2012-08-06 | 2012-11-21 | 江苏大学 | Water-soluble ceramic core and preparation method thereof |
| JP2014034707A (en) * | 2012-08-09 | 2014-02-24 | Castem Co Ltd | Method for producing metal powder sintered compact having hollow part |
| CN103601474A (en) * | 2013-10-24 | 2014-02-26 | 江苏大学 | Water-soluble ceramic core for high-temperature alloy monocrystal blades and preparation method of core |
| CN105693254A (en) * | 2016-02-03 | 2016-06-22 | 中国航空工业集团公司北京航空材料研究院 | Water-soluble ceramic core material and preparation method thereof |
| CN105798308A (en) * | 2016-03-29 | 2016-07-27 | 齐鲁工业大学 | Water-soluble salt core type metal powder injection molding technology |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107042309A (en) | 2017-08-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107042309B (en) | Water-soluble mold core part and preparation method thereof | |
| CN109304424B (en) | Modified silicon oxide powder and preparation method thereof, ceramic core and preparation method thereof | |
| CN104387038B (en) | A kind of method improving alumina ceramic core high-temperature behavior | |
| CN107498056B (en) | Production process of card holder | |
| CN107790722A (en) | A kind of preparation method of double-pore structure TiAl porous materials | |
| CN104291814A (en) | Ceramic earphone and manufacturing method thereof | |
| CN108405792A (en) | A kind of casting ceramsite sand and preparation method thereof | |
| CN108046779A (en) | The method that labyrinth hollow ball ceramic part is prepared using selective laser sintering | |
| CN101734920B (en) | Titanium nitride porous ceramics and preparation method thereof | |
| KR101763122B1 (en) | Manufacturing method of ceramic core, ceramic core, precision casting method and precision casting products | |
| CN101186491B (en) | High grade quartz ceramic and preparation method thereof | |
| JP2015514657A (en) | Ceramic material for radome, radome and manufacturing method thereof | |
| CN106083005A (en) | High porosity easily removes silicon-base ceramic core preparation method | |
| CN108465772B (en) | Preparation method of molding sand special for integral casting of large stainless steel parts | |
| CN109016078B (en) | Fiber ceramic powder compression molding process | |
| CN101891493A (en) | Method for synthesizing mullite refractory | |
| CN110241420A (en) | A kind of cemented carbide material and hard alloy exemplar | |
| CN104801657A (en) | Moulding sand suitable for precision casting and preparation method of moulding sand | |
| CN114149274A (en) | Method for preparing directional porous SiC ceramic by using coal slime as pore-forming agent | |
| CN113149698A (en) | Magnesium oxide ceramic core with good dissolution collapsibility and preparation method thereof | |
| CN111333425A (en) | Preparation method of clay quartz crucible for high-temperature alloy casting | |
| CN108017389B (en) | Ceramic material for die | |
| CN113045295A (en) | High-strength ceramic sectional material and preparation method thereof | |
| CN112341164A (en) | Ceramic mold for glass hot bending molding and preparation method thereof | |
| CN105478780A (en) | Method for preparing engine cylinder head by powder metallurgy process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |