CN108249922B - Sagger for metallurgy and preparation method thereof - Google Patents
Sagger for metallurgy and preparation method thereof Download PDFInfo
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- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
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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
- C04B35/16—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 silicates other than clay
- C04B35/18—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 silicates other than clay rich in aluminium oxide
- C04B35/185—Mullite 3Al2O3-2SiO2
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D5/00—Supports, screens, or the like for the charge within the furnace
- F27D5/0006—Composite supporting structures
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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
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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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
- C04B2235/34—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
- C04B2235/349—Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite
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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
- C04B2235/3817—Carbides
- C04B2235/3826—Silicon carbides
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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
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3852—Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride
- C04B2235/3873—Silicon nitrides, e.g. silicon carbonitride, silicon oxynitride
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Abstract
The invention relates to a metallurgical sagger and a preparation method thereof, belonging to the technical field of metallurgy. The metallurgical sagger of the invention consists of an inner layer, a middle layer and an outer layer; the inner layer is a carbon composite material layer, the middle layer is refractory cotton or ceramic cotton, and the outer layer is a non-wave-absorbing material layer; wherein, the carbonaceous composite material layer comprises the following components in parts by weight: 50-70 parts of graphite, 20-40 parts of silicon carbide, 5-10 parts of silicon nitride, 1-5 parts of talc, 0.5-4.5 parts of reinforcing fiber and 5-15 parts of phenolic resin; the non-wave-absorbing material layer consists of the following components in parts by weight: 50-80 parts of mullite, 30-60 parts of corundum powder, 50-90 parts of high-alumina bauxite, 30-50 parts of kieselguhr and 20-40 parts of raw bauxite. The metallurgical sagger outer layer structure can enhance the mechanical strength of the inner layer and the whole sagger, the inner layer is protected from being corroded by high-temperature melt, any layer can be replaced after being damaged, the service life is prolonged, and materials are saved.
Description
Technical Field
The invention relates to a metallurgical sagger and a preparation method thereof, belonging to the technical field of metallurgy.
Background
The microwave heating technology is applied to the metallurgical industry, is a revolution of the metallurgical technology, and has the advantages of energy conservation, high efficiency, environmental protection and the like. However, the application of microwave heating technology in the metallurgical industry is not mature enough at present, and the technology is still in the laboratory or semi-industrial stage, and has a plurality of problems. When the alloy is smelted by microwave, the saggars made of carbon, silicon carbide, graphite and other composite materials containing carbon, silicon carbide and the like are used for containing materials and reaction melt, so that the problem that the crucible or the saggar is corroded by smelting high-temperature melt can be solved well, but the carbon, silicon carbide, graphite and other carbon composite materials have strong microwave absorption capacity, so that the saggars made of carbon, silicon carbide, graphite and other carbon composite materials are heated by microwave, a part of microwave energy is absorbed, and the utilization efficiency of the microwave energy is reduced. If the sagger is made of carbon, silicon carbide, graphite and other carbon composite materials, the mechanical strength is low and the sagger is easy to damage.
Although sagger made of silica, aluminum trioxide, calcium carbonate and materials containing the components, such as mullite, high alumina brick and other materials which do not absorb waves can be prevented from being heated by microwave, the sagger is easy to react with the components in the materials, so that the sagger is corroded, and the service life is short.
Disclosure of Invention
The invention aims to provide a metallurgical sagger and a preparation method thereof, and solves the technical problems that a carbonaceous sagger absorbs partial microwave energy, has low mechanical strength and is easy to damage, and the sagger made of a non-wave-absorbing material is easy to react with materials and erode and has short service life.
The realization process of the invention is as follows:
a sagger for metallurgy is of a composite structure and comprises an inner layer, a middle layer and an outer layer; the inner layer is a carbon composite material layer, the middle layer is refractory cotton or ceramic cotton, and the outer layer is a non-wave-absorbing material layer; wherein, the carbonaceous composite material layer comprises the following components in parts by weight: 50-70 parts of graphite, 20-40 parts of silicon carbide, 5-10 parts of silicon nitride, 1-5 parts of talc, 0.5-4.5 parts of reinforcing fiber and 5-15 parts of phenolic resin; the non-wave-absorbing material layer consists of the following components in parts by weight: 50-80 parts of mullite, 30-60 parts of corundum powder, 50-90 parts of high-alumina bauxite, 30-50 parts of kieselguhr and 20-40 parts of raw bauxite.
The preparation method of the sagger for metallurgy comprises the following steps:
(1) adding graphite, silicon carbide, silicon nitride, talc, reinforcing fiber and phenolic resin into a pulverizer according to the parts by weight, mixing and pulverizing into 400-mesh and 500-mesh powder;
(2) adding 10-30 parts by weight of water into the powder obtained in the step (1), performing wet ball milling for 4-6 hours, performing granulation and green compact forming, drying for 12-24 hours after demolding, placing into a kiln for sintering, introducing inert gas into the kiln for protection, wherein the sintering time is 20-25 hours, and the sintering temperature is 1000-1300 ℃, so as to obtain an inner layer blank of the sagger for metallurgy;
(3) adding mullite, corundum powder, high-alumina bauxite, diatomite and raw bauxite into a crusher according to the weight parts, mixing and crushing into 400-mesh and 500-mesh powder;
(4) adding 10-30 parts by weight of water into the powder obtained in the step (3), performing wet ball milling for 4-6 hours, performing granulation and green compact forming, drying for 12-24 hours after demolding, placing into a kiln for sintering, introducing inert gas into the kiln for protection, and obtaining an outer layer blank of the sagger for metallurgy at the sintering temperature of 1000-1300 ℃;
(5) and making the inner layer green body and the outer layer green body into a groove shape by using an angle grinder or a cutting machine, fitting the groove of the outer layer green body with the outer wall of the inner layer green body, wherein the size of the groove of the outer layer green body is larger than that of the inner layer green body, and filling refractory cotton or ceramic cotton between the inner layer green body and the outer layer green body.
Further, the compaction forming in the step (2) adopts isostatic pressing or hydraulic forming under the pressure of 50 Mpa.
Further, the thickness of the inner layer blank in the step (5) is 3-8 mm.
Further, the size of the groove of the outer layer green body in the step (5) is 2-4mm larger than that of the outer wall of the inner layer green body.
The refractory cotton or the ceramic cotton has the following functions: firstly, it fills the fixed action, secondly leaves the room when taking place expend with heat and contract with cold.
The invention has the following positive effects: although the inner layer of the metallurgical sagger can be heated by absorbing waves, the structure is thin, the consumed microwave energy is greatly reduced compared with the prior sagger, the outer layer structure can enhance the mechanical strength of the inner layer and the whole sagger, the inner layer can be protected from being eroded by high-temperature melt, and any layer can be replaced after being damaged, so that the service life is prolonged, and the used materials are saved.
Drawings
FIG. 1 is a schematic structural view of a metallurgical sagger in example 1, wherein 1 is an outer layer of the sagger, 2 is an inner layer of the sagger, and 3 is an intermediate layer;
FIG. 2 is a schematic structural view of a metallurgical container in example 2, wherein 4 is an outer layer of the container, 5 is an inner layer of the container, and 6 is an intermediate layer.
Detailed Description
The present invention will be further described with reference to the following examples.
The invention provides a metallurgical sagger and a preparation method thereof, aiming at solving the technical problems that a carbonaceous sagger absorbs partial microwave energy, has low mechanical strength and is easy to damage, and the sagger made of non-wave-absorbing materials is easy to react with materials and erode and has short service life. The sagger for metallurgy is of a composite structure and comprises an inner layer, a middle layer and an outer layer; the inner layer is a carbon composite material layer, the middle layer is refractory cotton or ceramic cotton, and the outer layer is a non-wave-absorbing material layer; wherein, the carbonaceous composite material layer comprises the following components in parts by weight: 50-70 parts of graphite, 20-40 parts of silicon carbide, 5-10 parts of silicon nitride, 1-5 parts of talc, 0.5-4.5 parts of reinforcing fiber and 5-15 parts of phenolic resin; the non-wave-absorbing material layer consists of the following components in parts by weight: 50-80 parts of mullite, 30-60 parts of corundum powder, 50-90 parts of high-alumina bauxite, 30-50 parts of kieselguhr and 20-40 parts of raw bauxite.
The preparation method of the sagger for metallurgy comprises the following steps:
(1) adding graphite, silicon carbide, silicon nitride, talc, reinforcing fiber and phenolic resin into a pulverizer according to the parts by weight, mixing and pulverizing into 400-mesh and 500-mesh powder;
(2) adding 10-30 parts by weight of water into the powder obtained in the step (1), performing wet ball milling for 4-6 hours, performing granulation and green compact forming, drying for 12-24 hours after demolding, placing into a kiln for sintering, introducing inert gas into the kiln for protection, wherein the sintering time is 20-25 hours, and the sintering temperature is 1000-1300 ℃, so as to obtain an inner layer blank of the sagger for metallurgy;
(3) adding mullite, corundum powder, high-alumina bauxite, diatomite and raw bauxite into a crusher according to the weight parts, mixing and crushing into 400-mesh and 500-mesh powder;
(4) adding 10-30 parts by weight of water into the powder obtained in the step (3), performing wet ball milling for 4-6 hours, performing granulation and green compact forming, drying for 12-24 hours after demolding, placing into a kiln for sintering, introducing inert gas into the kiln for protection, and obtaining an outer layer blank of the sagger for metallurgy at the sintering temperature of 1000-1300 ℃;
(5) and making the inner layer green body and the outer layer green body into a groove shape by using an angle grinder or a cutting machine, fitting the groove of the outer layer green body with the outer wall of the inner layer green body, wherein the size of the groove of the outer layer green body is larger than that of the inner layer green body, and filling refractory cotton or ceramic cotton between the inner layer green body and the outer layer green body.
Further, the compaction forming in the step (2) adopts isostatic pressing or hydraulic forming under the pressure of 50 Mpa.
Further, the thickness of the inner layer blank in the step (5) is 3-8 mm.
Further, the size of the groove of the outer layer green body in the step (5) is 2-4mm larger than that of the outer wall of the inner layer green body.
The refractory cotton or the ceramic cotton has the following functions: firstly, it fills the fixed action, secondly leaves the room when taking place expend with heat and contract with cold.
Although the inner layer of the metallurgical sagger can be heated by absorbing waves, the structure is thin, the consumed microwave energy is greatly reduced compared with the prior sagger, the outer layer structure can enhance the mechanical strength of the inner layer and the whole sagger, the inner layer can be protected from being eroded by high-temperature melt, and any layer can be replaced after being damaged, so that the service life is prolonged, and the used materials are saved.
Example 1
The metallurgical sagger of the invention is shown in figure 1 and consists of an inner layer, a middle layer and an outer layer; the inner layer is a carbon composite material layer, the middle layer is refractory cotton, and the outer layer is a non-wave-absorbing material layer;
the carbonaceous composite material layer comprises the following components in parts by weight:
60 parts of graphite, 30 parts of silicon carbide, 8 parts of silicon nitride, 3 parts of talcum, 2.5 parts of reinforcing fiber and 10 parts of phenolic resin;
the non-wave-absorbing material layer consists of the following components in parts by weight:
70 parts of mullite, 50 parts of corundum powder, 70 parts of high-alumina bauxite, 40 parts of diatomite and 30 parts of raw bauxite.
The preparation method of the sagger for metallurgy comprises the following steps:
(1) adding graphite, silicon carbide, silicon nitride, talc, reinforcing fiber and phenolic resin into a pulverizer according to the parts by weight, mixing and pulverizing into 400-mesh and 500-mesh powder;
(2) adding 20 parts by weight of water into the powder obtained in the step (1), carrying out wet ball milling for 5 hours, carrying out granulation and green compact forming, drying for 20 hours after demolding, placing into a kiln for sintering, introducing inert gas into the kiln for protection, wherein the sintering time is 23 hours, and the sintering temperature is 1200 ℃, so as to obtain an inner layer green body of the sagger for metallurgy;
(3) adding mullite, corundum powder, high-alumina bauxite, diatomite and raw bauxite into a crusher according to the weight parts, mixing and crushing into 400-mesh and 500-mesh powder;
(4) adding 20 parts by weight of water into the powder obtained in the step (3), carrying out wet ball milling for 5 hours, granulating, forming by isostatic pressing and pressing, drying for 24 hours after demolding, sintering in a kiln for 23 hours at the sintering temperature of 1100 ℃, and obtaining an outer layer blank of the sagger for metallurgy;
(5) and (2) making the inner layer green body and the outer layer green body into a groove shape by using an angle grinder or a cutting machine, wherein the thickness of the inner layer green body is 5mm, the groove of the outer layer green body is matched with the outer wall of the inner layer green body, the size of the groove of the outer layer green body is 3mm larger than that of the outer wall of the inner layer green body, and refractory cotton or ceramic cotton is filled between the inner layer green body and the outer layer green body.
Example 2
The metallurgical sagger of the invention is shown in figure 2 and consists of an inner layer, a middle layer and an outer layer; the inner layer is a carbon composite material layer, the middle layer is refractory cotton, and the outer layer is a non-wave-absorbing material layer.
The carbonaceous composite material layer comprises the following components in parts by weight:
50 parts of graphite, 40 parts of silicon carbide, 10 parts of silicon nitride, 5 parts of talcum, 4.5 parts of reinforcing fiber and 15 parts of phenolic resin;
the non-wave-absorbing material layer consists of the following components in parts by weight:
80 parts of mullite, 60 parts of corundum powder, 90 parts of high-alumina bauxite, 50 parts of diatomite and 40 parts of raw aluminum stone.
The preparation method of the sagger for metallurgy comprises the following steps:
(1) adding graphite, silicon carbide, silicon nitride, talc, reinforcing fiber and phenolic resin into a pulverizer according to the parts by weight, mixing and pulverizing into 400-mesh and 500-mesh powder;
(2) adding 30 parts by weight of water into the powder obtained in the step (1), carrying out wet ball milling for 6 hours, carrying out granulation and green compact forming, drying for 24 hours after demolding, placing into a kiln for sintering, introducing inert gas into the kiln for protection, wherein the sintering time is 25 hours, and the sintering temperature is 1300 ℃, so as to obtain an inner layer green body of the sagger for metallurgy;
(3) adding mullite, corundum powder, high-alumina bauxite, diatomite and raw bauxite into a crusher according to the weight parts, mixing and crushing into 400-mesh and 500-mesh powder;
(4) adding 30 parts by weight of water into the powder obtained in the step (3), carrying out wet ball milling for 6 hours, granulating, carrying out isostatic pressing, drying for 24 hours after demolding, placing into a kiln for sintering, introducing inert gas into the kiln for protection, wherein the sintering time is 25 hours, and the sintering temperature is 1300 ℃, so as to obtain an outer layer blank of the sagger for metallurgy;
(5) and (2) making the inner layer green body and the outer layer green body into groove shapes by using an angle grinder or a cutting machine, wherein the thickness of the inner layer green body is 8mm, the groove of the outer layer green body is matched with the outer wall of the inner layer green body, the size of the groove of the outer layer green body is 2mm larger than that of the outer wall of the inner layer green body, and refractory cotton or ceramic cotton is filled between the inner layer green body and the outer layer green body.
Example 3
The metallurgical sagger of the invention consists of an inner layer, a middle layer and an outer layer; the inner layer is a carbon composite material layer, the middle layer is ceramic wool, and the outer layer is a non-wave-absorbing material layer;
the carbonaceous composite material layer comprises the following components in parts by weight:
70 parts of graphite, 20 parts of silicon carbide, 5 parts of silicon nitride, 1 part of talcum, 0.5 part of reinforcing fiber and 5 parts of phenolic resin;
the non-wave-absorbing material layer consists of the following components in parts by weight:
50 parts of mullite, 30 parts of corundum powder, 50 parts of high-alumina bauxite, 30 parts of diatomite and 20 parts of raw aluminum stone.
The preparation method of the sagger for metallurgy comprises the following steps:
(1) adding graphite, silicon carbide, silicon nitride, talc, reinforcing fiber and phenolic resin into a pulverizer according to the parts by weight, mixing and pulverizing into 400-mesh and 500-mesh powder;
(2) adding 10 parts by weight of water into the powder obtained in the step (1), performing wet ball milling for 4 hours, performing granulation and green compact forming, drying for 12 hours after demolding, placing into a kiln for sintering, introducing inert gas into the kiln for protection, wherein the sintering time is 20 hours, and the sintering temperature is 1000 ℃, so as to obtain an inner layer green body of the sagger for metallurgy;
(3) adding mullite, corundum powder, high-alumina bauxite, diatomite and raw bauxite into a crusher according to the weight parts, mixing and crushing into 400-mesh and 500-mesh powder;
(4) adding 10 parts by weight of water into the powder obtained in the step (3), performing wet ball milling for 4 hours, granulating, performing hydraulic compaction forming under the pressure of 50Mpa, demolding, drying for 12 hours, putting into a kiln for sintering, introducing inert gas into the kiln for protection, and obtaining an outer layer blank of the sagger for metallurgy, wherein the sintering time is 20 hours, and the sintering temperature is 1000 ℃;
(5) and (2) making the inner layer green body and the outer layer green body into a groove shape by using an angle grinder or a cutting machine, wherein the thickness of the inner layer green body is 3mm, the groove of the outer layer green body is matched with the outer wall of the inner layer green body, the size of the groove of the outer layer green body is 4mm larger than that of the outer wall of the inner layer green body, and refractory cotton or ceramic cotton is filled between the inner layer green body and the outer layer green body.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and is not intended to limit the invention to the particular forms disclosed. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (1)
1. A sagger for metallurgy is characterized in that the sagger is of a composite structure and comprises an inner layer, a middle layer and an outer layer; the inner layer is a carbon composite material layer, the middle layer is refractory cotton or ceramic cotton, and the outer layer is a non-wave-absorbing material layer;
wherein, the carbonaceous composite material layer comprises the following components in parts by weight: 50-70 parts of graphite, 20-40 parts of silicon carbide, 5-10 parts of silicon nitride, 1-5 parts of talc, 0.5-4.5 parts of reinforcing fiber and 5-15 parts of phenolic resin;
the non-wave-absorbing material layer consists of the following components in parts by weight: 50-80 parts of mullite, 30-60 parts of corundum powder, 50-90 parts of high-alumina bauxite, 30-50 parts of kieselguhr and 20-40 parts of raw bauxite;
the preparation method of the sagger for metallurgy comprises the following steps:
(1) adding graphite, silicon carbide, silicon nitride, talc, reinforcing fiber and phenolic resin into a pulverizer according to the parts by weight, mixing and pulverizing into 400-mesh and 500-mesh powder;
(2) adding 10-30 parts by weight of water into the powder obtained in the step (1), performing wet ball milling for 4-6 hours, performing granulation and green compact forming, drying for 12-24 hours after demolding, placing into a kiln for sintering, introducing inert gas into the kiln for protection, wherein the sintering time is 20-25 hours, and the sintering temperature is 1000-1300 ℃, so as to obtain an inner layer blank of the sagger for metallurgy;
(3) adding mullite, corundum powder, high-alumina bauxite, diatomite and raw bauxite into a crusher according to the weight parts, mixing and crushing into 400-mesh and 500-mesh powder;
(4) adding 10-30 parts by weight of water into the powder obtained in the step (3), performing wet ball milling for 4-6 hours, performing granulation and green compact forming, drying for 12-24 hours after demolding, placing into a kiln for sintering, introducing inert gas into the kiln for protection, and obtaining an outer layer blank of the sagger for metallurgy at the sintering temperature of 1000-1300 ℃;
(5) making the inner layer green body and the outer layer green body into a groove shape by using an angle grinder or a cutting machine, fitting the groove of the outer layer green body with the outer wall of the inner layer green body, wherein the size of the groove of the outer layer green body is larger than that of the inner layer green body, and filling refractory cotton or ceramic cotton between the inner layer green body and the outer layer green body; the thickness of the inner layer blank body in the step (5) is 3-8 mm;
and (3) the green compact forming in the step (2) adopts isostatic pressing or hydraulic forming under the pressure of 50MPa, and the groove size of the outer layer green body in the step (5) is 2-4mm larger than the outer wall of the inner layer green body.
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| CN108249922B true CN108249922B (en) | 2020-12-29 |
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| CN109534837B (en) * | 2019-01-09 | 2021-07-27 | 山东中鹏特种陶瓷有限公司 | Silicon carbide coated graphite sagger and manufacturing process thereof |
| CN112225570B (en) * | 2019-07-14 | 2023-02-17 | 江苏摩铸特种陶瓷有限公司 | Three-layer silicon carbide graphite crucible and preparation method thereof |
| CN113636848A (en) * | 2021-03-29 | 2021-11-12 | 湖北大清科技有限公司 | Method for preparing graphite sagger by using graphite waste |
| CN114538928B (en) * | 2022-04-25 | 2022-07-12 | 长沙中瓷新材料科技有限公司 | Graphite carbon-based sagger |
| CN118089411B (en) * | 2024-04-18 | 2024-07-05 | 长沙中瓷新材料科技有限公司 | Silicon carbide coated graphite sagger and manufacturing process thereof |
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