CN110981436B - Powder pressing ceramic die for synthesis of superhard material blade and preparation method - Google Patents
Powder pressing ceramic die for synthesis of superhard material blade and preparation method Download PDFInfo
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- 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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- 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
- C04B35/62605—Treating the starting powders individually or as mixtures
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- 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
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
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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
- C04B2235/30—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
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- 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
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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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
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3852—Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride
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Abstract
The invention provides a powder pressing ceramic die for synthesizing a superhard material blade and a preparation method thereof, wherein the powder pressing ceramic die comprises the following components in percentage by weight: 20-50wt% of dolomite, 40-70wt% of magnesium oxide, 5-15wt% of hexagonal boron nitride and 2-5wt% of zirconia. The preparation method of the powder pressing ceramic die for synthesizing the superhard material blade comprises the following steps: (1) Uniformly mixing all the components, loading the mixture into a disc granulator, spraying water glass for granulation, and drying to obtain granules; (2) And (2) filling the granulated material obtained in the step (1) into a bin of a full-automatic powder press, pressing and forming, and then drying and calcining to obtain the die. The invention directly presses ceramic powder on an automatic press, has high pressing efficiency, high material utilization rate, easy control of die density, good pressure transmission characteristic and lower price than a graphite die.
Description
Technical Field
The invention relates to the field of superhard material preparation, in particular to a preparation method of a powder pressing ceramic die for synthesizing a superhard material blade.
Background
The superhard materials are mainly diamond and cubic boron nitride. Diamond (english: diamond) is currently known as the hardest substance in the world, and the hardness of C60 may not be inferior to that of Diamond, but is not yet determined. Cubic boron nitride is second only to diamond in hardness. The hardness of the two superhard materials is far higher than that of other materials, including corundum and silicon carbide which are used as abrasive materials, and hard tool materials such as hard alloy and high-speed steel which are used as cutter materials.
Therefore, superhard materials are suitable for use in the manufacture of tools for machining other materials, and in particular for machining hard materials, have incomparable advantages and are of irreplaceable importance. As such, superhard materials have found wide industrial application. In addition to the use for manufacturing tools, superhard materials have special properties in the aspects of optics, electricity and heat, are important functional materials, and attract high attention, and the properties and the applications of the superhard materials are continuously researched and developed.
Graphite is adopted as forming die at present in the synthesis of superhard materials, and graphite jig adopts graphite rod machining to form, and machining efficiency is low, and the dust is big, and the price is high, and most non-circular moulds all do not have the end, need the manual work to glue the end, and waste man-hour to graphite jig can influence electric conductivity and density because graphite bar material is every batch density difference, thereby influences blade material quality.
Disclosure of Invention
The invention provides a preparation method of a powder pressing ceramic die for synthesizing a superhard material blade, which solves the problems of low efficiency, manual bottom adhesion, labor waste and poor blade quality in the existing superhard material processing process.
The technical scheme for realizing the invention is as follows:
a powder pressing ceramic die for synthesizing a superhard material blade comprises the following components in percentage by weight: 20-50wt% of dolomite, 40-70wt% of magnesium oxide, 5-15wt% of hexagonal boron nitride and 2-5wt% of zirconium oxide.
The preparation method of the powder pressing ceramic die for synthesizing the superhard material blade comprises the following steps:
(1) Uniformly mixing all the components, putting the components into a disc granulator, spraying water glass for granulation, and drying to obtain granules;
(2) And (2) filling the granulated material obtained in the step (1) into a bin of a full-automatic powder press, pressing and forming, and then drying and calcining to obtain the die.
The adding amount of the water glass in the step (1) is 5-15wt% of the total weight of the components.
In the step (1), the granulation size is 30-60 meshes, and the drying temperature is 80 ℃.
The pressing pressure in the step (2) is 30-50 tons, and the pressed product is baked for 4-6 hours at 140-160 ℃.
The calcination temperature in the step (2) is 1000-1500 ℃.
The beneficial effects of the invention are: the powder pressing ceramic die is adopted to replace a graphite die, dolomite resists high temperature, changes phase under the high temperature, increases the volume, and can uniform the internal pressure of a cavity; the magnesium oxide has high temperature resistance and good insulativity; the hexagonal boron nitride is high temperature resistant, good in insulativity and self-lubricating, and can improve the powder pressing density. The invention directly presses ceramic powder on an automatic press, has high pressing efficiency, high material utilization rate, easy control of die density, good pressure transmission characteristic and lower price than a graphite die.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood 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 obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
A powder pressing ceramic die for synthesizing a superhard material blade comprises the following components in percentage by weight: 20 wt% of dolomite, 70wt% of magnesium oxide, 5wt% of hexagonal boron nitride and 5wt% of zirconium oxide.
The preparation process comprises the following steps:
(1) The powder is prepared according to the proportion, the mixture is uniform, then the powder is put into a disk granulator, water glass is sprayed for granulation, the adding amount of the water glass is 5wt% of the total weight of the components, the granulation size is between 30 meshes, and the granulated material is baked in an oven at 80 ℃ to be half-dry;
(2) Then filling the material into a bin of a full-automatic powder press, and installing different dies according to different products so as to press products with different specifications and shapes, wherein the pressing pressure is 30 tons;
(3) And baking the pressed blank in a baking oven at 140 ℃ for 6h, then putting the blank into a high-temperature baking oven, baking the blank at 1000 ℃, and calcining the blank to obtain the powder pressing ceramic die.
Example 2
A powder pressing ceramic die for synthesizing a superhard material blade comprises the following components in percentage by weight: 40 wt% of dolomite, 50wt% of magnesium oxide, 8 wt% of hexagonal boron nitride and 2wt% of zirconia.
The preparation process comprises the following steps:
(1) The powder is mixed evenly after being proportioned, then the powder is put into a disk pelletizer, water glass is sprayed for pelleting, the pelleting size is between 50 meshes, and the pelleting material is baked to be semi-dry in an oven at 80 ℃;
(2) Then filling the material into a bin of a full-automatic powder press, and installing different dies according to different products so as to press products with different specifications and shapes, wherein the pressing pressure is 40 tons;
(3) And baking the pressed blank in a baking oven at 150 ℃ for 5 hours, then putting the blank into a high-temperature baking oven, baking the blank at 1200 ℃, and calcining the blank to obtain the powder pressing ceramic die.
Example 3
A powder pressing ceramic die for synthesizing a superhard material blade comprises the following components in percentage by weight: 50wt% of dolomite, 40 wt% of magnesium oxide, 5wt% of hexagonal boron nitride and 5wt% of zirconia.
The preparation process comprises the following steps:
(1) The powder is mixed evenly after being proportioned, then the powder is put into a disk pelletizer, water glass is sprayed for pelleting, the pelleting size is between 50 meshes, and the pelleting material is baked to be semi-dry in an oven at 80 ℃;
(2) Then filling the material into a bin of a full-automatic powder press, and installing different dies according to different products so as to press products with different specifications and shapes, wherein the pressing pressure is 45 tons;
(3) And baking the pressed blank in an oven at 155 ℃ for 4.5h, then placing the blank into a high-temperature oven, firing the blank at 1400 ℃, and calcining the blank to obtain the powder pressing ceramic die.
Example 4
A powder pressing ceramic die for synthesizing a superhard material blade comprises the following components in percentage by weight: 25 wt% of dolomite, 57 wt% of magnesium oxide, 15wt% of hexagonal boron nitride and 3wt% of zirconia.
The preparation process comprises the following steps:
(1) The powder is mixed evenly after being proportioned, then the powder is put into a disk pelletizer, water glass is sprayed for pelleting, the pelleting size is between 60 meshes, and the pelleting material is baked to be half-dry in an oven at 80 ℃;
(2) Then filling the material into a bin of a full-automatic powder press, and installing different dies according to different products so as to press products with different specifications and shapes, wherein the pressing pressure is 50 tons;
(3) And baking the pressed blank in a 160 ℃ baking oven for 4 hours, then placing the blank into a high-temperature baking oven, firing the blank to 1500 ℃, and calcining the blank to obtain the powder pressing ceramic die.
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 fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A powder pressing ceramic die for synthesizing a superhard material blade is characterized by comprising the following components in percentage by weight: 20-50wt% of dolomite, 40-70wt% of magnesium oxide, 5-15wt% of hexagonal boron nitride and 2-5wt% of zirconium oxide, wherein the preparation method of the powder pressing ceramic die for synthesizing the superhard material blade comprises the following steps:
(1) Uniformly mixing all the components, loading the mixture into a disc granulator, spraying water glass for granulation, and drying to obtain granules;
(2) And (2) filling the granulated material obtained in the step (1) into a bin of a full-automatic powder press, pressing and forming, and then drying and calcining at the calcining temperature of 1000-1500 ℃ to obtain the die.
2. The method for manufacturing a powder compact ceramic mold for the synthesis of a superhard material insert according to claim 1, wherein: the adding amount of the water glass in the step (1) is 5-15wt% of the total weight of the components.
3. The method for manufacturing a powder compact ceramic mold for the synthesis of a superhard material insert according to claim 1, wherein: in the step (1), the granulation size is 30-60 meshes, and the drying temperature is 80 ℃.
4. The method for manufacturing a powder compact ceramic mold for the synthesis of a superhard material insert according to claim 1, wherein: the pressing pressure in the step (2) is 30-50 tons, and the pressed product is baked for 4-6 hours at 140-160 ℃.
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| CN111908842A (en) * | 2020-07-31 | 2020-11-10 | 航天特种材料及工艺技术研究所 | Nano heat-insulating material and preparation method thereof |
| CN113860855A (en) * | 2021-09-27 | 2021-12-31 | 郑州中南杰特超硬材料有限公司 | Method for manufacturing pressure transmission medium used in ultrahigh pressure environment |
| CN114455930B (en) * | 2022-01-11 | 2022-11-25 | 郑州中南杰特超硬材料有限公司 | Preparation method of dolomite composite material |
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| CA1177262A (en) * | 1983-02-04 | 1984-11-06 | Minyoung Lee | Composite of metal-bonded cubic boron nitride and a substrate and process of preparation |
| AU724090B2 (en) * | 1997-11-14 | 2000-09-14 | Diamond Innovations, Inc. | A cell and method for forming a composite hard material and composite hard materials formed thereby |
| AUPP040297A0 (en) * | 1997-11-14 | 1997-12-11 | Australian National University, The | A cell for forming a composite hard material and method of forming composite hard materials |
| US20050133277A1 (en) * | 2003-08-28 | 2005-06-23 | Diamicron, Inc. | Superhard mill cutters and related methods |
| US8052765B2 (en) * | 2007-04-03 | 2011-11-08 | Cho H Sam | Contoured PCD and PCBN for twist drill tips and end mills and methods of forming the same |
| CN102219509A (en) * | 2011-04-22 | 2011-10-19 | 辽宁中大超导材料有限公司 | Method and blank for manufacturing super-hard zirconia ceramic mould for tabletting and forming machine |
| CN103158287B (en) * | 2011-12-09 | 2015-06-10 | 郑州博特硬质材料有限公司 | Glomerocryst cubic boron nitride composite sheet and preparation method for same |
| CN104557068B (en) * | 2013-10-23 | 2016-08-17 | 郑州博特硬质材料有限公司 | A kind of mould of superhard material synthesis |
| CN207872108U (en) * | 2017-12-20 | 2018-09-18 | 富耐克超硬材料股份有限公司 | Superhard material synthesizes component and synthesizer |
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