CN106007724B - The preparation method of smelting metal high strength graphite silicon carbide crucible - Google Patents
The preparation method of smelting metal high strength graphite silicon carbide crucible Download PDFInfo
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—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
- C04B35/56—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 based on carbides or oxycarbides
- C04B35/565—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 based on carbides or oxycarbides based on silicon carbide
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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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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/52—Multiple coating or impregnating multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/89—Coating or impregnation for obtaining at least two superposed coatings having different compositions
Abstract
The invention discloses the smelting metal preparation methods of high strength graphite silicon carbide crucible, including：1）Feed proportioning；2）Batch mixing；3）Batch mixing is dried；4）Crushing and screening；5）Second batch；6）Rerolling；7）Compression moulding；8）Cutting finishing；9）Drying；10）Glazing；11）It is primary to fire；12）Dipping；13）Secondary firing；14）Coating；15）Go out finished product；The crucible that the present invention is produced using new crucible formula and new production technology, its high temperature resistant, corrosion resistance are stronger, and the average life span of crucible reaches 78 months, interiors of products even tissue zero defect, intensity are high, wall is relatively thin, good heat conductivity, in addition the glazing layer and coating and repeated drying of appearance, repeatedly firing, on the one hand substantially increase the corrosion resistance of product, on the other hand greatly reduce energy consumption, energy consumption saves 30% or so, and vitrifying degree is high.
Description
Technical field
The present invention relates to nonferrous metallurgy casting field more particularly to the systems of smelting metal high strength graphite silicon carbide crucible
Preparation Method.
Background technology
Graphitic carbon SiClx special type crucible is mainly used in non-ferrous metals casting and forging technology, as noble metal recycling with
Refining, plastics, ceramics, glass, cement, rubber and drug manufacture required corrosion-and high-temp-resistant product and petro chemical industry
Corrosion-resistant container needed for field.
The formula of existing graphitic carbon SiClx special type crucible and the finished product of technique productions because by production technology limited with
And the limitation of formula etc., it is 55 days to lead to produced product average life span, and the service life is too short, and use and production cost are continuous
Increase, the waste of generation also remains high, and therefore, studies a kind of novel graphitic carbon SiClx special type crucible and its production technology
It is current urgent problem, graphitic carbon SiClx special type crucible has larger purposes in each field of industrial chemistry.
Invention content
In view of the above problems, the present invention is intended to provide the preparation of smelting metal high strength graphite silicon carbide crucible
Method, it is the product high temperature resistant prepared in the method, corrosion-resistant, it is long using mission, and can accomplish to save during production
The recycling rate of energy, emission reduction, environmental protection, waste is high, and resource is recycled to greatest extent.
To achieve the goals above, the technical solution adopted in the present invention is as follows：
The smelting metal preparation method of high strength graphite silicon carbide crucible, includes the following steps：
1）Feed proportioning：Silicon carbide, graphite, clay, metallic silicon are respectively put by driving in respective batch hopper,
PLC program automatically controls requires each material progress blanking to weigh according to the ratio, and blanking, each batch hopper bottom are controlled by operated pneumatic valve
At least two weighing sensors are arranged in portion, and the material after weighing is put by automatic moveable carriage machine in batch mixer, wherein
The first addition of silicon carbide is the 50% of its total amount；
2）Batch mixing：Blanking will buffer the raw material in hopper again to buffering in hopper after preparing raw material in batch mixer
It is promoted in blending bucket by bucket elevator and carries out batch mixing, deironing apparatus is set at bucket elevator feed opening, and in batch mixing
Priming apparatus is set on bucket, adds water, amount of water 10L/min while stirring；
3）Batch mixing is dried：Wet feed after batch mixing is dried in drying equipment, and 120-150 DEG C of drying temperature removes moisture removal, complete
Natural cooling is taken out after full drying；
4）Crushing and screening：The material of dried cake enters Crushing ＆ Screening Machineries progress precrushing, impact breaker is broken again
It is broken, while being sieved through 60 mesh screening plants, the material particles more than 0.25mm return to carry out cycle precrushing, breaks again again
It is broken, sieve again, material of the screening less than 0.25mm is to hopper；
5）Second batch：Material in lower hopper is transported again and carries out second batch into proportioning machine, when second batch
Remaining 50% silicon carbide is added in material, the material through second batch is sent into batch mixer and carries out batch mixing again；
6）Rerolling：Secondary agitation mixing process, special solution liquid-adding device of the setting with viscosity in blending bucket,
Special solution is weighed by weighing bucket and is added in blending bucket；
7）Compression moulding：The material of rerolling is sent into isostatic pressing machine hopper, by feeding in a mold, jolt ramming, takes out very
It is sent into isostatic pressing machine and is suppressed after empty, cleaning process；
8）Cutting finishing：Including Qie Gao and finishing crucible burr, cuts height and met the requirements by cutting high machine to be cut into
The height of crucible, and the burr after cutting is modified；
9）Drying：Through step（8）It cuts in the crucible feeding drying oven trimmed and carries out drying operation, drying temperature 120-
150 DEG C, 1-2 hours are kept the temperature after drying, air duct regulating system is set in drying oven, the air duct regulating system by several can on
The aluminium sheet of lower adjusting forms, which is arranged two medial surfaces in the drying oven, and each two aluminium
It is set as air duct between plate, achievees the purpose that adjust air duct by adjusting the gap between aluminium sheet described in each two；
10）Glazing：Glaze adds water through bentonite, fire clay, glass powder, feldspar powder, sodium carboxymethylcellulose according to the ratio
It is formulated, using manual brushing glazing when glazing；
11）It is primary to fire：The crucible feeding kiln progress once-firing of first-class glaze, firing time 28-30 hour, in order to
It improves and fires effect, one layer of with sealing effect and gas circuit blocking-up type labyrinth kiln bed, the kiln are set in kiln inner bottom surface
One layer of sealing cotton layer is arranged in the bed bottom, one layer of heat preservation brick layer is arranged on sealing cotton layer, which forms labyrinth kiln
Bed；
12）Dipping：The crucible feeding impregnating autoclave formed by a firing is vacuumized and pressure impregnation, vacuumizes, maceration extract is logical
Piping sealing is delivered in impregnating autoclave, dip time 45-60min；
13）Secondary firing：The crucible impregnated, which is put into kiln, carries out twice firing, and the firing time is 2 hours；
14）Coating：The good crucible surface application water paint acrylic resin water paint of twice firing；
15）Go out finished product：Dry tack free is carried out after the completion of coating, and packaging is put in storage after the completion of dry.
Preferably, which includes major ingredient according to parts by weight：40-50 parts of silicon carbide, 20-30 parts of graphite, clay
20-30 parts, 2-5 parts of metallic silicon；Auxiliary material：0.2-0.3 parts of wood pulp and glaze are several.
Preferably, which includes major ingredient according to parts by weight：45 parts of silicon carbide, 25 parts of graphite, 27 parts of clay, metallic silicon
3 parts；Auxiliary material：0.775 part of 0.25 part of wood pulp and glaze, wherein 0.125 part of bentonite, fire clay 0.05 in the glaze
Part, 0.2 part of glass powder, 0.125 part of feldspar powder, 0.075 part of sodium carboxymethylcellulose, 0.2 part of water.
Preferably, the step（1）Moveable carriage machine in " feed proportioning " is equipped with airborne deduster.
Preferably, the step（2）" batch mixing " and the step（6）Surrounding in " rerolling " in blending bucket is equal
Pneumatic arch device is set, which is Pneumatic knocking hammer, and blending bucket is constantly tapped during blanking, is realized
Blanking more thoroughly.
Preferably, the step（6）The special solution being added in " rerolling " is wood pulp solution.
Preferably, the step（7）Vibrator is set in the bottom of mold in " compression moulding ".
Preferably, the step（2）-（6）And（8）During be equipped with dust catcher.
Preferably, the step（9）Gas circuit blocking-up type labyrinth kiln bed described in " drying " is specifically on sealing cotton layer
Insulating brick-layer is arranged in face, in the insulating brick-layer, the insulating brick stagger setting of one of insulating brick and its forward and backward position, i.e.,
It is exactly the edge stagger setting with forward and backward insulating brick, gas circuit access can be blocked in this way, heat is stayed in into kiln to greatest extent
It is interior.
The beneficial effects of the invention are as follows：The crucible that the present invention is produced using new crucible formula and new production technology,
Its high temperature resistant, corrosion resistance are stronger, and the average life span of crucible reaches 7-8 months, interiors of products even tissue zero defect, strong
Degree is high, wall is relatively thin, good heat conductivity, in addition the glazing layer and coating and repeated drying of appearance, repeatedly firing, on the one hand significantly
The corrosion resistance for improving product, on the other hand greatly reduces energy consumption, and energy consumption saves 30% or so.
Description of the drawings
Fig. 1 is present invention process flow chart.
Fig. 2 is the arrangement schematic diagram of gas circuit blocking-up type of the present invention labyrinth kiln bed.
Specific implementation mode
In order to make those skilled in the art be better understood on technical scheme of the present invention, with reference to embodiment
Technical scheme of the present invention is further described.
Embodiment：The preparation method of smelting metal high strength graphite silicon carbide crucible, the crucible is according to parts by weight packet
Include major ingredient：45 parts of silicon carbide, 25 parts of graphite, 27 parts of clay, 3 parts of metallic silicon；Auxiliary material：0.775 part of 0.25 part of wood pulp and glaze,
0.125 part of bentonite, 0.05 part of fire clay, 0.2 part of glass powder, 0.125 part of feldspar powder, carboxymethyl cellulose in the glaze
0.075 part of sodium, 0.2 part of water.
Silicon carbide：It is commonly called as diamond dust, molecular weight 40.1, sterling is clear crystal, and industrial goods are in black dull because impure
Color, density are 3.06~3.2g/cm3, refractive index 2.65,2700 DEG C of fusing point, with high rigidity, high thermal stability and semiconductor
Property；
Graphite：For iron black, steel grey, metallic luster is opaque, 3850 DEG C of fusing point, 4827 DEG C of boiling point, density 2.25g/
cm2, it is corrosion-resistant, it is not easy to react with soda acid etc., is used as antiwear additive and lubriation material, make crucible, electrode, pencil-lead etc.；
Clay：Main component is kaolinite, accounts for about the 80-90% of total amount, followed by hydromuscovite and quartz.It is also a small number of
Using gibbsite as main component.Dioxide-containing silica is 43-55%, di-iron trioxide 1-3.5%, alundum (Al2O3) in clay
For 20-25%, titanium dioxide 0.8-1.2%；Clay used does not contain fluoride in the present invention；
Metallic silicon：Belonging to technical grade, silicone content is more than 97%, is the amorphous non-metal powder of dark brown, 1410 DEG C of fusing point,
2355 DEG C of boiling point, not soluble in water, hydrochloric acid, nitric acid etc.；This project is used to have a good welding performance for silicon copper, and by
To spark is not likely to produce when impact, there is explosion prevention function, can be used for making storage tank；
Wood pulp：Lignosulphonic acid magnesium 10-20%, aqueous solution 30-40%, dry matter 30-60%.
Sodium carboxymethylcellulose：Appearance is pure strain white or yellowish fibrous powder or particle, and it is molten to be dissolved in water, buck
Liquid, ammonia and cellulose solution, insoluble in organic solution, the colourless amorphous article of mineral oil.Can be used as powerful emulsifying agent for water/
Oil, oil/water system, are also used as thickener and stabilizer.
The smelting metal preparation method of high strength graphite silicon carbide crucible, includes the following steps：
1）Feed proportioning：Silicon carbide, graphite, clay, metallic silicon are respectively put by driving in respective batch hopper,
PLC program automatically controls requires each material progress blanking to weigh according to the ratio, and blanking, each batch hopper bottom are controlled by operated pneumatic valve
At least two weighing sensors are arranged in portion, and the material after weighing is put by automatic moveable carriage machine in batch mixer, wherein
The first addition of silicon carbide is the 50% of its total amount, and configuration solution bag protective device, reduces the production for the dust that feeds intake during feeding intake
It is raw；Adding for material feeds intake for indirect type, and proportioning machine has certain dust to overflow in the process of work, and dust yield is to throw
5/10000ths of dosage, the special dust catcher that is equipped with carry out purified treatment, and hopper upper side setting collection gas port collects the middle generation that feeds intake
Dust is handled after collection by bag filter, dust-collecting efficiency 95%, and then is discharged again by exhaust tube, due to graphite compared with
Gently, the batch hopper of graphite individually prepares bag filter processing, and the dust of dust-collecting efficiency 95%, collection directly returns to stone again
Cartridge, the dust after airborne deduster is collected add in batch mixer again, achieve the purpose that material recycle；
2）Batch mixing：Blanking will buffer the raw material in hopper again to buffering in hopper after preparing raw material in batch mixer
It is promoted in blending bucket by bucket elevator and carries out batch mixing, deironing apparatus, deironing apparatus are set at bucket elevator feed opening
Main three magnet tubes being provided at bucket elevator feed opening, are removed the iron in batch mixing by magnet tube, are improved mixed
The purity of material, and priming apparatus is set in blending bucket, add water, amount of water 10L/min, mistake of the batch mixing in work while stirring
The certain dust of Cheng Zhongyou overflows, and dust carries out purified treatment by dust catcher, adds water that material can be made quickly to lump mixing；
3）Batch mixing is dried：Wet feed after batch mixing is dried in drying equipment, and 120-150 DEG C of drying temperature removes moisture removal, is dried
Dry equipment uses drying oven, and drying oven uses natural gas as combustion medium, takes out natural cooling after drying completely, after cooling
Material can be sent into subsequent processing progress crushing and screening and be granulated again；
4）Crushing and screening：The material of dried cake enters Crushing ＆ Screening Machineries progress precrushing, impact breaker is broken again
Broken, precrushing is that the material of caking is first broken into coarse granule, and it is then to be broken into coarse granule that impact breaker is crushed again
Fine grained, at the same through 60 mesh screening plants sieve, the material particles more than 0.25mm return to carry out again cycle precrushing,
It is crushed, sieves again again, to hopper, crushing and screening process has certain dust and overflows material of the screening less than 0.25mm, passes through
Dust catcher carries out purified treatment, and dust-collecting efficiency 95%, treated, and exhaust gas is discharged by exhaust tube；
5）Second batch：The material for meeting granularity requirements in lower hopper is transported again and carries out secondary match into proportioning machine
Material remaining 50% silicon carbide is added in material when second batch, and the material through second batch is sent into batch mixer and is carried out again
Batch mixing；
The present invention's is that silicon carbide is divided into two parts to carry out compounding, mixing, can ensure the equal of compounding, mixing in this way
It is even, ensure that the crucible of production has a performances such as high rigidity, high thermal stability and semiconductive, and this dispensing batch mixing of the present invention
Method solves in the prior art that dispensing batch mixing is uneven, the relatively low problem of the quality of production；
6）Rerolling：Secondary agitation mixing process, special solution liquid-adding device of the setting with viscosity in blending bucket,
Special solution is weighed by weighing bucket and is added in blending bucket, and wood pulp is added in special solution, and the addition temperature of wood pulp is in 18-20
DEG C, because wood pulp has higher viscosity, the mixed adhesive strength of material can be improved, into further increasing the strong of crucible
Degree, extends its service life；
7）Compression moulding：The material of rerolling is sent into isostatic pressing machine hopper, by feeding in a mold, jolt ramming, takes out very
It is sent into isostatic pressing machine and is suppressed after empty, cleaning process, vibrator is arranged in the bottom of mold, and mold bottom increases vibrator
Afterwards, vibration is more solid, and the density higher be combineding with each other between material, raw material has on a small quantity during being put into mold
Dust is overflowed carries out purified treatment by dust catcher；
8）Cutting finishing：Including Qie Gao and finishing crucible burr, cuts height and met the requirements by cutting high machine to be cut into
The height of crucible, and the burr after cutting is modified, the dust for cutting the process generation of finishing is carried out only by dust catcher
Change is handled；
9）Drying：Through step（8）It cuts in the crucible feeding drying oven trimmed and carries out drying operation, drying temperature 120-
150 DEG C, 1-2 hours are kept the temperature after drying, which is natural gas heat-conducting oil furnace, and crucible proper alignment is in drying oven；Drying
Air duct regulating system is set in stove, the air duct regulating system by several can the aluminium sheet of up and down adjustment form, this is upper and lower adjustable
Two medial surfaces in the drying oven are arranged in the aluminium sheet of section, and are set as air duct between each two aluminium sheet, by adjusting every two
Gap between a aluminium sheet achievees the purpose that adjust air duct, and card slot is arranged in every piece of aluminium sheet both ends, aluminium sheet can be in card slot
It moves up and down, adjusts air duct size；
10）Glazing：Glaze adds water through bentonite, fire clay, glass powder, feldspar powder, sodium carboxymethylcellulose according to the ratio
It is formulated, 0.125 part of bentonite, 0.05 part of fire clay, 0.2 part of glass powder, 0.125 part of feldspar powder, carboxymethyl cellulose
0.075 part of sodium, 0.2 part of water generate waste water using manual brushing glazing when glazing in the cleaning of glaze charging basket, which enters plant area's precipitation
Pond is precipitated, and supernatant is discharged into development zone drainage system, and precipitating sludge dries rear crush cycle and uses, environmental protection, liquid waste processing
Effect is good；
11）It is primary to fire：The crucible of first-class glaze is sent into kiln and carries out once-firing, firing time 28-30 hour, burned
Crucible become special cermacis product, i.e. one layer of band sealing is arranged in order to improve firing effect in crucible in kiln inner bottom surface
Effect and gas circuit blocking-up type labyrinth kiln bed, the kiln bed bottom be arranged one layer sealing cotton layer, sealing cotton layer above setting
One layer of heat preservation brick layer, the insulating brick-layer form labyrinth kiln bed；Gas circuit blocking-up type labyrinth kiln bed is specifically to be set on sealing cotton layer
Insulating brick-layer is set, in the insulating brick-layer, the insulating brick stagger setting of one of insulating brick and its forward and backward position is exactly
With the edge stagger setting of forward and backward insulating brick, gas circuit access can be blocked in this way, and heat is stayed in kiln to greatest extent,
Gas circuit is blocked between every two blocks of insulating bricks, and gas cannot be from the gap on ground to leakage, can only upwards " spilling ", by heat
It all concentrates in kiln being fired, reduces the thermal loss in sintering procedure, save the energy, and improve firing efficiency,
Shorten the firing time；
12）Dipping：The crucible feeding impregnating autoclave formed by a firing is vacuumized and pressure impregnation, 0.5MPa pressurize 30min,
It vacuumizes, maceration extract is delivered to by seal for pipe joints in impregnating autoclave, dip time 45-60min；
13）Secondary firing：The crucible impregnated, which is put into kiln, carries out twice firing, and the firing time is 2 hours；
14）Coating：The good crucible surface application water paint acrylic resin water paint of twice firing；
15）Go out finished product：Dry tack free is carried out after the completion of coating, and packaging is put in storage after the completion of dry.
Have been shown and described above the present invention novel process, It should be understood by those skilled in the art that the present invention not by
The limitation of above-described embodiment, the above embodiments and description only illustrate the principle of the present invention, is not departing from this hair
Under the premise of bright spirit and scope, various changes and improvements may be made to the invention, these changes and improvements both fall within claimed
The scope of the invention in, the scope of the present invention is defined by the appended claims and its equivalents.
Claims (5)
1. the smelting metal preparation method of high strength graphite silicon carbide crucible, which is characterized in that include the following steps：
1）Feed proportioning：Silicon carbide, graphite, clay, metallic silicon are respectively put by driving in respective batch hopper, PLC journeys
Sequence automatically controls requires each material progress blanking to weigh according to the ratio, controls blanking by operated pneumatic valve, each batch hopper bottom is set
At least two weighing sensors are set, the material after weighing is put by automatic moveable carriage machine in batch mixer, wherein being carbonized
The first addition of silicon is the 50% of its total amount；
2）Batch mixing：Blanking passes through the raw material buffered in hopper to buffering in hopper again after preparing raw material in batch mixer
Bucket elevator, which is promoted in blending bucket, carries out batch mixing, deironing apparatus is arranged at bucket elevator feed opening, and in blending bucket
Priming apparatus is set, adds water, amount of water 10L/min while stirring；
3）Batch mixing is dried：Wet feed after batch mixing is dried in drying equipment, and 120-150 DEG C of drying temperature removes moisture removal, is dried completely
Natural cooling is taken out after dry；
4）Crushing and screening：The material of dried cake enters Crushing ＆ Screening Machineries progress precrushing, impact breaker is crushed again, together
When through 60 mesh screening plants sieve, the material particles more than 0.25mm return to carries out again cycle precrushing, again be crushed, again
Screening, material of the screening less than 0.25mm to hopper；
5）Second batch：Material in lower hopper is transported again and carries out second batch into proportioning machine, when second batch will remain
50% remaining silicon carbide is added in material, and the material through second batch is sent into batch mixer and carries out batch mixing again；
6）Rerolling：Secondary agitation mixing process, special solution liquid-adding device of the setting with viscosity, special in blending bucket
Solution is weighed by weighing bucket and is added in blending bucket；
The step（2）" batch mixing " and the step（6）In " rerolling " pneumatic break is respectively provided in the surrounding of blending bucket
Encircle device, which is Pneumatic knocking hammer, blending bucket is constantly tapped during blanking, under realizing more thoroughly
Material；
The step（6）The special solution being added in " rerolling " is wood pulp solution；
7）Compression moulding：The material of rerolling is sent into isostatic pressing machine hopper, by feeding, jolt ramming, vacuumizing, clearly in a mold
It washes to be sent into isostatic pressing machine after process and be suppressed；The step（7）Vibrator is set in the bottom of mold in " compression moulding "；
8）Cutting finishing：Including Qie Gao and finishing crucible burr, it is to be cut into the crucible met the requirements by cutting high machine to cut height
Height, and the burr after cutting is modified；
9）Drying：Through step（8）It cuts in the crucible feeding drying oven trimmed and carries out drying operation, drying temperature 120-150
DEG C, 1-2 hours are kept the temperature after drying, air duct regulating system is set in drying oven, and the air duct regulating system can be upper and lower by several
The aluminium sheet of adjusting forms, which is arranged two medial surfaces in the drying oven, and each two aluminium sheet
Between be set as air duct, achieve the purpose that adjust air duct by adjusting the gap described in each two between aluminium sheet；
10）Glazing：Glaze adds water to prepare through bentonite, fire clay, glass powder, feldspar powder, sodium carboxymethylcellulose according to the ratio
It forms, using manual brushing glazing when glazing；
11）It is primary to fire：The crucible of first-class glaze is sent into kiln and carries out once-firing, firing time 28-30 hour, in kiln
One layer of with sealing effect and gas circuit blocking-up type labyrinth kiln bed is set on portion bottom surface, which is arranged one layer of sealing cotton
One layer of heat preservation brick layer is arranged on sealing cotton layer in layer, which forms labyrinth kiln bed；
The step（11）Gas circuit blocking-up type labyrinth kiln bed described in " primary to fire " is specifically to be arranged on sealing cotton layer
Insulating brick-layer, in the insulating brick-layer, the insulating brick stagger setting of one of insulating brick and its forward and backward position, that is, be exactly with
The edge stagger setting of forward and backward insulating brick, can block gas circuit access in this way, and heat is stayed in kiln to greatest extent；
12）Dipping：The crucible feeding impregnating autoclave formed by a firing is vacuumized and pressure impregnation, vacuumizes, maceration extract passes through pipe
Road sealing is delivered in impregnating autoclave, dip time 45-60min；
13）Secondary firing：The crucible impregnated, which is put into kiln, carries out twice firing, and the firing time is 2 hours；
14）Coating：The good crucible surface application water paint acrylic resin water paint of twice firing；
15）Go out finished product：Dry tack free is carried out after the completion of coating, and packaging is put in storage after the completion of dry.
2. the smelting metal according to claim 1 preparation method of high strength graphite silicon carbide crucible, which is characterized in that
The raw material for crucible includes major ingredient according to parts by weight：40-50 parts of silicon carbide, 20-30 parts of graphite, 20-30 parts of clay, metallic silicon 2-
5 parts；Auxiliary material：0.2-0.3 parts of wood pulp and glaze are several.
3. the smelting metal according to claim 2 preparation method of high strength graphite silicon carbide crucible, it is characterised in that：
The crucible includes major ingredient according to parts by weight：45 parts of silicon carbide, 25 parts of graphite, 27 parts of clay, 3 parts of metallic silicon；Auxiliary material：Wood pulp
0.25 part and 0.775 part of glaze, wherein 0.125 part of bentonite, 0.05 part of fire clay, glass powder 0.2 in the glaze
Part, 0.125 part of feldspar powder, 0.075 part of sodium carboxymethylcellulose, 0.2 part of water.
4. the smelting metal according to claim 1 preparation method of high strength graphite silicon carbide crucible, which is characterized in that
The step（1）Moveable carriage machine in " feed proportioning " is equipped with airborne deduster.
5. the smelting metal according to claim 1 preparation method of high strength graphite silicon carbide crucible, which is characterized in that
The step（2）-（6）And（8）During be equipped with dust catcher.
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| CN109516807B (en) * | 2018-12-25 | 2021-08-06 | 安徽工业大学 | Silicon carbide-expanded graphite composite material parison and preparation method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1048751A (en) * | 1990-07-17 | 1991-01-23 | 天津大学 | Metallic crucible made of anticorrosion composite material |
| CN102942365A (en) * | 2012-12-07 | 2013-02-27 | 俞金龙 | Production method and application of microwave-heated heat-insulating board |
| CN103964875A (en) * | 2014-05-09 | 2014-08-06 | 青岛百顿坩埚有限公司 | Raw material composition for graphite-silicon carbide crucible and manufacturing process thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1048751A (en) * | 1990-07-17 | 1991-01-23 | 天津大学 | Metallic crucible made of anticorrosion composite material |
| CN102942365A (en) * | 2012-12-07 | 2013-02-27 | 俞金龙 | Production method and application of microwave-heated heat-insulating board |
| CN103964875A (en) * | 2014-05-09 | 2014-08-06 | 青岛百顿坩埚有限公司 | Raw material composition for graphite-silicon carbide crucible and manufacturing process thereof |
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