CN1364996A - Multiple furnace core furnace for smelting silicon carbide and its method for producing silicon carbide - Google Patents
Multiple furnace core furnace for smelting silicon carbide and its method for producing silicon carbide Download PDFInfo
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- CN1364996A CN1364996A CN01132774A CN01132774A CN1364996A CN 1364996 A CN1364996 A CN 1364996A CN 01132774 A CN01132774 A CN 01132774A CN 01132774 A CN01132774 A CN 01132774A CN 1364996 A CN1364996 A CN 1364996A
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- furnace
- silicon carbide
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- 229910010271 silicon carbide Inorganic materials 0.000 title claims abstract description 32
- 238000003723 Smelting Methods 0.000 title claims abstract description 23
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims description 16
- 239000000463 material Substances 0.000 claims abstract description 29
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 9
- 239000010439 graphite Substances 0.000 claims abstract description 9
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 9
- 239000007772 electrode material Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000002485 combustion reaction Methods 0.000 claims description 92
- 150000001875 compounds Chemical class 0.000 claims description 11
- 239000012774 insulation material Substances 0.000 claims description 11
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims description 9
- 239000003830 anthracite Substances 0.000 claims description 9
- 239000000571 coke Substances 0.000 claims description 8
- 239000003921 oil Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 6
- 239000002802 bituminous coal Substances 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 125000006850 spacer group Chemical group 0.000 claims description 5
- 239000006004 Quartz sand Substances 0.000 claims description 4
- 240000007594 Oryza sativa Species 0.000 claims description 2
- 235000007164 Oryza sativa Nutrition 0.000 claims description 2
- 239000004020 conductor Substances 0.000 claims description 2
- 235000009566 rice Nutrition 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 3
- 239000011162 core material Substances 0.000 abstract 4
- -1 bitmute Chemical compound 0.000 abstract 1
- 238000013329 compounding Methods 0.000 abstract 1
- 239000011810 insulating material Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 230000008901 benefit Effects 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 241001417490 Sillaginidae Species 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000002006 petroleum coke Substances 0.000 description 1
- 239000011295 pitch Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
The silicon carbide smelting furnace comprises heat insulating wall, heat maintaining material, reaction material, two or more plate furnace cores buried inside the reaction material and electrodes. The furnace cores are arranged parallelly or spatially and each of the furnace cores has ends connected to electrodes. The silicon carbide smelting process includes desiging furnace shape; compounding furnace core material with graphite, bitmute, silicon carbide and silicon dioxide; selecting electrode material and shape; and determining the ratio of the reaction material and heat insulating material. The present invention has obvious energy saving effect, high product yield and high product quality.
Description
The present invention relates to the stove and the production method thereof of silicon carbide smelting.
Existing various countries produce carborundum, all usefulness is a combustion chamber, the history in existing more than 100 year of this single combustion chamber mode of production, the backward production of this high energy consumption, low output is tried hard to improve by many countries, and success is very few so far, only improves mechanization and develops to some extent aspect horizontal strengthening the body of heater scale at present, these all fundamentally do not solve, per unit area yield energy consumption height, high-class product rate are low, and single furnace output is little, and easily producing spray stove etc. influences problems such as productivity effect and safety in production.Before the application, applied for one three core stove patent, its application number is 01106717.9, date of application is 01 month 15 days calendar year 2001, and this patented technology can make energy consumption reduce more than 10%, and single furnace output improves 50%, high-class product reaches more than 60%, produce and also to have advantages such as not spraying stove, maximize and produce and the combustion chamber number is few, structure is single, can not adapt to defectives such as the requirement of multiple capacity specifications power supply facilities and different working condition requirements but also exist the incompatibility type of furnace.
The object of the present invention is to provide a kind of many combustion chambers or tabular whole combustion chamber, multi-electrode to heat simultaneously, make the multiple furnace core furnace of silicon carbide smelting of heat energy mutual superposition of the reaction material of low-temperature space.
Another object of the present invention provides the method for producing carborundum with multiple furnace core furnace.
The technical scheme that realizes the object of the invention is to solve like this: the multiple furnace core furnace of silicon carbide smelting comprises insulated wall, reaction material and insulation material.The contribution that the present invention did is to be embedded with in reaction material and the insulation material combustion chambers tabular or more than two or two, the two ends of combustion chamber are connected with electrode, electrode is connected with power supply again, above-mentioned said combustion chamber is in reaction material, can be n is arranged in parallel or the three-dimensional combustion chamber of arranging, can equidistant arrangement also can not equidistant arrangement, infinitely small or when equalling zero when any one combustion chamber arrangement pitches, its combustion chamber constitutes tabular whole combustion chamber, and said electrode is monolithic combined electrode or the monoblock electrode that is made of main electrode and auxiliary electrode.
The method that multiple furnace core furnace is produced carborundum is to follow these steps to carry out:
A. determine the production scale of multiple furnace core furnace, the design type of furnace;
B. calculate combustion chamber number and arrangement mode according to the type of furnace of design;
C. determine section configuration and the size and the modes of emplacement of combustion chamber;
D. select the combustion chamber material mixture ratio, its combustion chamber material mainly includes the graphite of 62-98 part, 0-18 part bituminous coal, 0-8 part carborundum powder, 0-12 part silicon dioxide powder;
E. according to combustion chamber section configuration and the size selected, by the combustion chamber material mixture ratio with various compositions weigh and stir pack into gently molded in the spacer plate box;
F. select the electrode form of fracture according to combustion chamber number and arrangement mode, determine that with compound electrode still be the monoblock electrode, it is electrode that its electrode material is generally selected with carbon lump, perhaps adopts other conductive materials;
G. determine combustion chamber spacing L, L is generally 0-5 rice;
H. determine the proportioning of reaction material and insulation material, its proportioning is anthracite or petroleum coke carbon ratio: silica=0.3-1: 1-2, the granularity requirements of reaction material and insulation material is that the footpath degree of anthracite or oil coke is 0.001-100mm, and the granularity of quartz sand is the 0.01-30 millimeter; Wherein contain SiO in the quartz sand
2＞95.0%, fixed carbon＞56% in anthracite or the oil coke, ash＜10%;
I. various parameters of determining by above-mentioned steps, with electrode, reaction material, insulation material, combustion chamber, be fit into stove, energising is smelted and is formed product.
The present invention compared with prior art
The compound electrode multiple furnace core furnace, in SiC smelts by multiple spot heating in the stove or whole tabular large tracts of land heating and the heat generating spot heat energy mutual superposition of low-temperature space on every side, effectively utilized heat energy, improved the thermal efficiency, it is short to have heat transfer distances, heat transfer rate is fast, thermograde is little, is suitable for generating the warm area broadness of SiC, mutual good heat insulating and thermal efficiency high-technology advantage between combustion chamber, this production SiC new technology has production safety, do not spray stove, dust is few, and is easy to operate, be easy to keep away advantages such as peak power supply, adopt compound electrode form and many combustion chambers structure, have multifunctionality, adjust and go slick, the combustion chamber spacing can be provided with arbitrarily as requested, is easy to the body of heater maximization and reaches characteristics such as implementing transformation on existing equipment.
Can save energy more than 12%, below the per unit area yield energy consumption 6000 degree/T, select quality and the ratio of first-grade products are compared than conventional art and can on average be improved approximately 32%, and it is about 50% that single furnace output can improve, and good economic benefits is arranged.
The invention will be further described below in conjunction with drawings and Examples:
Fig. 1-1 combustion chamber main pseudosection that is arranged in parallel;
Fig. 1-2 combustion chamber cross section cutaway view that is arranged in parallel;
Fig. 2-1 erects 2 combustion chambers and arranges sectional drawing;
The three-dimensional sectional drawing of arranging of Fig. 2-2 product word combustion chamber;
The three-dimensional sectional drawing of arranging of Fig. 2-3 4 combustion chamber;
The three-dimensional sectional drawing of arranging of Fig. 2-4 5 combustion chamber;
Three times three-dimensional sectional drawings of arranging on Fig. 2-5 5 combustion chamber two;
Three times three-dimensional sectional drawings of arranging in two on Fig. 2-6 6 combustion chamber one;
The Three Up Three Down of Fig. 2-7 6 combustion chamber is three-dimensional arranges;
The three-dimensional sectional drawing of arranging of Fig. 2-8 8 combustion chamber garden shape;
The three-dimensional sectional drawing of arranging of Fig. 2-9 5 combustion chamber polygon;
Fig. 3-1 electrode inverted T-shape sectional drawing;
Fig. 3-2 electrode T font sectional drawing;
Fig. 3-3 electrode rectangle sectional drawing;
Fig. 3-4 electrode H-shape cross section figure;
Fig. 3-5 electrode square sectional drawing;
Fig. 3-6 electrode trapezoidal cross-section figure;
Fig. 3-7 electrode figure of falling the trapezoidal cross-section;
Fig. 3-8 electrode garden shape sectional drawing;
Fig. 3-9 electrode polygon sectional drawing;
Fig. 3-10 electrode combination shape sectional drawing.
Fig. 1-1, Fig. 1-2, Fig. 3-1 are a specific embodiment of the present invention.
Shown in Fig. 1-1, Fig. 1-2, Fig. 3-1, reaction material 2 and insulation material 1 are housed in the insulated wall 4, in reaction material 2, are embedded with 4 core combustion chambers 3.Combustion chamber 3 is for being arranged in parallel, and its two ends are connected with electrode 5, and electrode 5 is connected with power supply again.Combustion chamber 3 is erect for rectangle and is placed.Electrode 5 is an inverted T-shape.
Combustion chamber number, combustion chamber section and arrangement mode depend primarily on factory building size and height and production scale and decide, electrode structure depend mainly on combustion chamber arrangement mode and number what, selection monoblock electrode or compound electrode.The combustion chamber spacing is arranged and is generally equidistant arrangement, and the spacing infinitesimal of just using not equidistant arrangement or combustion chamber arrangement when the special type of furnace is when spacing equals zero, and its combustion chamber constitutes tabular whole combustion chamber.
Fig. 2-1～Fig. 2-9 is many combustion chambers permutation and combination view, its combustion chamber size can be identical, also can be inequality, its permutation and combination shape mainly depends on factory building size, just, determines to use above-mentioned wherein a kind of layout drawing according to the stove length size of design again.
Fig. 3-1～Fig. 3-the 10th, various electrode shape views, it can form the monoblock electrode by main electrode and auxiliary electrode.Also can constitute compound electrode by the electrode combination of any two or more shape of above-mentioned Fig. 3-1～Fig. 3-9; By a certain electrode group that is combined into when same size or the different size among Fig. 3-1～Fig. 3-9; Or electrode is independently of one another and corresponding with the combustion chamber number of Fig. 2-1～Fig. 2-8 and constitute, for example the electrode group among Fig. 3-10.The electrode group of these versions is more saved electrode material, has multifunctionality, the power supplying efficiency height, and adjustment and running are more flexible, are easy to the smelting furnace that maximizes.
Embodiment 1:
A. determine that according to mill construction and power supply facilities producing the stove scale is 150 tons of single furnace outputs, the type of furnace is the four-core stove;
C. the section of combustion chamber 3 is a square, is of a size of 52 * 52cm, and modes of emplacement is three-dimensional parallel placement;
D. the combustion chamber material is 83 parts of graphite powders, 6 parts of bituminous coal, 11 parts of silica;
E. by above-mentioned combustion chamber 3 shape and size, the parallel baffle case two with 4000 * 600 * 600 is assembled reaction material 2, press-fits the combustion chamber material and installs combustion chamber, treat that ground floor insulation material 1, reaction material 2 and combustion chamber 3 install after, with crane machinery spacer plate box is proposed.In like manner, repave another layer.
F. the smelting furnace electrode adopts Fig. 3-5 monoblock public electrode, and electrode material adopts graphite block;
G. the combustion chamber spacing is 1.2 meters;
H. anthracite (or oil coke) is 1: 1.55 with the ratio of silica, amounts to 750 tons of compounds;
I. by the technique scheme shove charge, smelting furnace was smelted 90 hours with the power supply unit energising of 10000KW, but 150 tons of production silication silicon.
Embodiment 2:
Present embodiment is the method that two furnace core furnaces are produced carborundum:
A. determine that according to mill construction and power supply facilities producing the stove scale is single stove, 40 tons of single furnace outputs, the type of furnace are two core stoves;
B. combustion chamber is the three-dimensional arrangements of two cores, sees Fig. 2-1;
C. the combustion chamber section is a polygon, the placement figure when being of a size of inscribed circle diameter and equaling 25cm;
D. the combustion chamber material is 86 parts of graphite powders, 6 parts of bituminous coal, 5 parts of silica, 3 parts of carborundum;
E. by above-mentioned combustion chamber shape and size, the spacer plate box two assembling reaction material with 4000 * 600 * 600 press-fit the combustion chamber material and install combustion chamber, and other are with embodiment 1;
F. smelting furnace electricity level adopts Fig. 3-10 monolithic compound electrode, and electrode material adopts graphite block;
G. the combustion chamber spacing is 1m;
H. anthracite (or oil coke) is 1: 1.50 with the ratio of silica, amounts to 200 tons of compounds;
I. by the technique scheme shove charge, smelting furnace was smelted 90 hours with the power supply unit energising of 5000KW, can produce 75 tons of carborundum.
Embodiment 3:
A. determine that according to mill construction and power supply facilities producing the stove scale is 200 tons of single furnace outputs, the type of furnace is five core stoves;
B. combustion chamber is the three-dimensional arrangements of five cores, sees Fig. 2-4;
C. the combustion chamber section is a rectangle, is of a size of 36 * 20cm, and modes of emplacement is placed for erectting;
D. the combustion chamber material is 92 parts of graphite powders, 5 parts of bituminous coal, 3 parts of silica;
E. by above-mentioned combustion chamber shape and size, the spacer plate box two assembling reaction material with 4000 * 600 * 600 press-fit the combustion chamber material and install combustion chamber, and other are with embodiment 1;
F. the smelting furnace electrode adopts trapezoidal cross-section of Fig. 3-6 trapezoidal cross-section or Fig. 3-7, and electrode material adopts graphite block;
G. the combustion chamber spacing is 1.3m;
H. anthracite (or oil coke) is 1: 1.60 with the ratio of silica, amounts to 1000 tons of compounds;
I. by the technique scheme shove charge, smelting furnace was smelted 100 hours with the power supply unit energising of 12000KW, but 200 tons of production silication silicon.
In sum, the present invention is owing to adopt a plurality of combustion chamber heatings, heat transfer rate is fast, thermal field is even, be suitable for generating the warm area broadness (especially infinitely small or when being zero when a plurality of combustion chamber spacings, warm area is more even during the tabular whole combustion chamber that constituted) of SiC, thermograde is little in the stove, available power is fully used, and it is too concentrated not produce heat energy.Therefore, can not produce the generation of spray stove accident, guarantee production safety.In addition, many combustion chambers heat insulation effect is remarkable, and suitable employing keeps away the peak power supply.
Adopt the present invention on the one hand again, product quality is guaranteed, and select quality and first class product rate obviously improve, and output can increase substantially, and economic benefit and social benefit are fairly obvious.For silicon carbide smelting from now on provides more effective technical way.
Claims (8)
1. the multiple furnace core furnace of a silicon carbide smelting, comprise insulated wall (4), reaction material (2) and insulation material (1), it is characterized in that being embedded with tabular in the reaction material (2) or the combustion chamber more than 2 or 2 (3), the two ends of combustion chamber (3) are connected with electrode (5), electrode (5) is connected with power supply again, above-mentioned said many combustion chambers (3) can be to be arranged in parallel or three-dimensional the arrangement in reaction material (2), and above-mentioned said electrode (5) is monolithic combined electrode or the monoblock electrode that is made of main electrode and auxiliary electrode.
2. the multiple furnace core furnace of silicon carbide smelting according to claim 1, it is characterized in that the combustion chamber number is 2,3,4,5,6 to N combustion chamber, arrangement mode for according to the width of stove, highly, length takes the equidistant or not equidistant three-dimensional arrangement or the form that is arranged in parallel.
3. the multiple furnace core furnace of silicon carbide smelting according to claim 1 and 2 is characterized in that infinitely smallly or when equalling zero when N combustion chamber spacing, constitutes tabular whole combustion chamber.
4. the multiple furnace core furnace of silicon carbide smelting according to claim 1 is characterized in that the combustion chamber cross section is respectively square, garden shape, polygon, rectangle, and rectangular length-width ratio is: long: wide=50～1: 1.
5. the multiple furnace core furnace of silicon carbide smelting according to claim 1 is characterized in that the electrode section configuration is respectively inverted T-shape, T font, rectangle, I-shaped, square, trapezoidal, trapezoidal, garden shape, polygon, combination shape.
6. the multiple furnace core furnace of silicon carbide smelting according to claim 1 is characterized in that single compound electrode or constitutes the electrode group with the corresponding electrode of combustion chamber number.
7. the multiple furnace core furnace of silicon carbide smelting according to claim 1 or 5 it is characterized in that being combined into the electrode group by two or more form electrode arbitrarily, or a certain electrode shape is combined into the electrode group when same size or different size.
8. use the method for the multiple furnace core furnace production carborundum of the described silicon carbide smelting of claim 1, it is characterized in that following these steps to carrying out:
A. determine the production scale of multiple furnace core furnace, the design type of furnace;
B. calculate combustion chamber number and arrangement mode according to the type of furnace of design;
C. determine section configuration and the size and the modes of emplacement of combustion chamber;
D. select the combustion chamber material mixture ratio, its combustion chamber material mainly contains the graphite of 62-98 part, 0-18 part bituminous coal, 0-8 part carborundum powder, 0-12 part silicon dioxide powder;
E. according to combustion chamber section configuration and the size selected, by the combustion chamber material mixture ratio with various compositions weigh and stir pack into gently molded in the spacer plate box;
F. select the electrode form of fracture according to combustion chamber number and arrangement mode, determine that with compound electrode still be the monoblock electrode, it is electrode that its electrode material is generally selected with carbon lump, perhaps adopts other conductive materials;
G. determine combustion chamber spacing L, L is generally 0-5 rice;
H. determine the proportioning of reaction and insulation material, its proportioning is anthracite or oil coke: silica=0.3-1: 1-2, and the granularity requirements of reaction and insulation material is that the granularity of anthracite or oil coke is 0.001-100mm, and the granularity of quartz sand is the 0.01-30 millimeter; Wherein contain SiO in the quartz sand
2＞95.0%, fixed carbon＞56% in anthracite or the oil coke, ash＜10%;
I. various parameters of determining by above-mentioned steps, with electrode, reaction material, insulation material, combustion chamber, be fit into stove, energising is smelted and is formed product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01132774XA CN1181306C (en) | 2001-01-15 | 2001-09-21 | Multiple furnace core furnace for smelting silicon carbide and its method for producing silicon carbide |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01106718 | 2001-01-15 | ||
| CN01106718.7 | 2001-01-15 | ||
| CNB01132774XA CN1181306C (en) | 2001-01-15 | 2001-09-21 | Multiple furnace core furnace for smelting silicon carbide and its method for producing silicon carbide |
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| Publication Number | Publication Date |
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| CN1364996A true CN1364996A (en) | 2002-08-21 |
| CN1181306C CN1181306C (en) | 2004-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB01132774XA Expired - Lifetime CN1181306C (en) | 2001-01-15 | 2001-09-21 | Multiple furnace core furnace for smelting silicon carbide and its method for producing silicon carbide |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101962187A (en) * | 2010-10-19 | 2011-02-02 | 平罗县滨河碳化硅制品有限公司 | Serial double-furnace core silicon carbide smelting furnace |
| CN103641499A (en) * | 2013-11-29 | 2014-03-19 | 凤冈县凤鸣农用机械制造有限公司 | Refractory stove core and preparation method thereof |
| CN103757703B (en) * | 2014-01-24 | 2016-08-24 | 汪长安 | A kind of High-purity large-size silicon carbide single crystal and preparation technology thereof |
| CN110195981A (en) * | 2019-04-24 | 2019-09-03 | 段晓燕 | A kind of resistance furnace discharging device |
| CN111233495A (en) * | 2020-03-12 | 2020-06-05 | 中南大学 | Sintering method for preparing fine-grain boron carbide |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202164123U (en) * | 2011-07-01 | 2012-03-14 | 段晓燕 | Furnace side wall for collecting gas of silicon carbide smelting furnace |
-
2001
- 2001-09-21 CN CNB01132774XA patent/CN1181306C/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101962187A (en) * | 2010-10-19 | 2011-02-02 | 平罗县滨河碳化硅制品有限公司 | Serial double-furnace core silicon carbide smelting furnace |
| CN101962187B (en) * | 2010-10-19 | 2012-10-24 | 平罗县滨河碳化硅制品有限公司 | Serial double-furnace core silicon carbide smelting furnace |
| CN103641499A (en) * | 2013-11-29 | 2014-03-19 | 凤冈县凤鸣农用机械制造有限公司 | Refractory stove core and preparation method thereof |
| CN103641499B (en) * | 2013-11-29 | 2014-12-31 | 凤冈县凤鸣农用机械制造有限公司 | Refractory stove core and preparation method thereof |
| CN103757703B (en) * | 2014-01-24 | 2016-08-24 | 汪长安 | A kind of High-purity large-size silicon carbide single crystal and preparation technology thereof |
| CN110195981A (en) * | 2019-04-24 | 2019-09-03 | 段晓燕 | A kind of resistance furnace discharging device |
| CN111233495A (en) * | 2020-03-12 | 2020-06-05 | 中南大学 | Sintering method for preparing fine-grain boron carbide |
| CN111233495B (en) * | 2020-03-12 | 2021-05-11 | 中南大学 | Sintering method for preparing fine-grain boron carbide |
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| CN1181306C (en) | 2004-12-22 |
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Address after: Yanta Road 710054 middle Shaanxi province Xi'an City No. 58 Patentee after: Xi'an University of Science and Technology Address before: Yanta Road 710054 middle Shaanxi province Xi'an City No. 58 Patentee before: Xi'an Science and Technology College |
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Effective date of registration: 20190520 Address after: 713199 No. 3 Textile Third Road, Xinxing Textile Industrial Park, Xianyang City, Shaanxi Province Patentee after: Xianyang New Energy Materials Industry Technology Research Institute Co., Ltd. Address before: 710054 84 Yanta Road South, Yanta District, Xi'an, Shaanxi Patentee before: Shanxi Xike Boer Special Materials Technology Co., Ltd. |
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