CN106083144A - A kind of silicon nitride large size ceramic heat storage and preparation technology thereof - Google Patents

A kind of silicon nitride large size ceramic heat storage and preparation technology thereof Download PDF

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Publication number
CN106083144A
CN106083144A CN201610433814.3A CN201610433814A CN106083144A CN 106083144 A CN106083144 A CN 106083144A CN 201610433814 A CN201610433814 A CN 201610433814A CN 106083144 A CN106083144 A CN 106083144A
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heat storage
weight portion
silicon nitride
weight
large size
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吴道君
周守洪
李军营
姜朝兴
杨晓波
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Hubei Shenwu Thermal Energy Technology Co Ltd
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Hubei Shenwu Thermal Energy Technology Co Ltd
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Abstract

A kind of silicon nitride large size ceramic heat storage, it is characterized in that described heat storage is column structure, the duct of multiple through cylinder it is provided with inside heat storage, described heat storage is sintered by inorganic powder and additive and forms, and wherein inorganic powder includes the component of following weight proportion: carborundum 60 weight portion～70 weight portions, silica flour 10 weight portion～30 weight portions, silicon nitride 5 weight portion～10 weight portions, alumina powder 2 weight portion～8 weight portions, silicon dioxide 2 weight portion～5 weight portions, calcium oxide 1.0 weight portion～2.5 weight portions.The present invention has good processability and conformal performance.Using inventive formulation and production method, heat storage duct is intensive, and wall thickness is thin, and wall thickness is only 1mm, and sectional dimension is big, and sectional dimension is more than 100cm2, draw ratio is high, and length reaches 1000mm, the features such as it is little that all ducts have resistance, and dust stratification is few, is not easily blocked, and dust discharge is functional.

Description

A kind of silicon nitride large size ceramic heat storage and preparation technology thereof
Technical field
The invention belongs to industrial energy saving, emission abatement device field, particularly relate to a kind of silicon nitride large size ceramic heat storage And preparation technology.
Background technology
Regenerative combustion technology has obtained extensively application on industrial furnace, and one of its technological core is high-temperature heat accumulation honeycomb Body.Heat accumulating type ceramic honey comb, due to good storage exothermicity, high-temperature behavior and thermal shock resistance, instead of traditional accumulation of heat Formula bead, checker brick.During use, make high-temperature flue gas and cryogenic gas (such as air gas) the most in turn by commutation By heat storage, make heat storage constantly absorb heat heat release, medium as heat exchange, reach the mesh of flue gas and air gas heat exchange 's.Detailed process is: when high-temperature flue gas is by heat storage, heat storage is heated to high temperature, and flue-gas temperature is through being greatly reduced heel row Putting, now accumulation of heat is in heat storage；After commutation, Cryogenic air or coal gas flow through heat storage from opposite direction, heated paramount Temperature, heat storage heat release is also lowered the temperature；Again after commutation, flue gas passes through heat storage, is heated by heat storage.So move in circles, it is achieved The discharged at lower temperature of flue gas and heat energy recycle.
The heat exchange area of ceramic honey comb has direct relation with ceramic honey comb aperture and wall thickness.Ceramic honey comb product aperture is more Little, wall thickness is the thinnest, surface area is the biggest, and heat exchange area is the biggest, and heat exchange efficiency is the highest.But in application process, there is a lot of reasons Making heat storage to use, trace it to its cause, the most existing ceramic honey comb formula and processing technology are unreasonable, after causing burning till Honeycomb ceramics anti-wear performance, decay resistance are the highest, size is little, length is short, aperture compared with big, wall thickness, global shape are irregular.
When honeycomb ceramic body size is little, length in short-term, regenerator is assembled, between honeycomb ceramics by multiple little honeycomb ceramics There is certain interval.Thus cause that the airflow hole between any two honeycomb ceramics is off and there is serious inconsistent phenomenon. Dust in flue gas and the particulate matter staggered site deposition between honeycomb ceramics, last blocking airflow through hole.And existing honeycomb Ceramic body is undesirable because of material, causes heat exchange efficiency to be also affected.
Summary of the invention
The present invention provides a kind of silicon nitride large size ceramic heat storage and preparation technology thereof, in order to solve existing honeycomb pottery Porcelain anti-wear performance, decay resistance are the highest, and shape is irregular, size is little, length is short, aperture is relatively big, wall thickness, during use easily Blocking flue, thermal waste are big, heat changes the technical problems such as efficiency is low.
In order to solve above technical problem, the technical solution used in the present invention is: in order to solve above technical problem, this Invention is adopted the technical scheme that: a kind of silicon nitride large size ceramic heat storage, it is characterized in that described heat storage is cylinder Structure, is provided with the duct of multiple through cylinder inside heat storage, described heat storage is sintered by inorganic powder and additive and forms, its Middle inorganic powder includes the component of following weight proportion: carborundum 60-70 weight portion, silica flour 10-30 weight portion, silicon nitride 5-10 Weight portion, alumina powder 2-8 weight portion, silicon dioxide 2-5 weight portion, calcium oxide 1.0-2.5 weight portion；Described heat storage Cross sectional shape is polygon, semicircle, circle, arch, fan-shaped one, and the cross sectional shape in described duct is polygon, semicircle Shape, circle, arch, one or more fan-shaped combinations, described heat storage cross section circumscribed circle diameter >=150mm, cylinder length with Cross section circumscribed circle diameter ratio >=3；Described preparation technology is: (1) is dry mixed: first add in ball mill by inorganic powder, be dry mixed 6～ 8 hours, cross the screen cloth of 80 mesh；(2) doping, described additive component includes organic binder bond, plasticizer and wetting agent, presses 100 parts of listed as parts by weight of inorganic powder, wherein organic binder bond is 2.0～5.0 weight portions, and plasticizer is 0.5～3.0 weight Part, wetting agent is 0.5～3.0 weight portions；(3) mediate, kneader adds water and lubricant while stirring；(4) just practice: will Pug carries out just practicing on vacuum deairing machine, and pug mill vacuum >=-0.05MPa when just practicing practices into closely knit pug block, detection The moisture content of pug block, index of plasticity；The moisture content of described pug block, index of plasticity be: moisture content 28～32%, extrusion Power plasticity 1700～2200N；(5) old: to carry out old in pug block is placed in the ageing silo that environment is 3 DEG C, old time 5h, Carry out old in pug block is placed in the ageing silo that environment is 8～25 DEG C again, old time >=24h；(6) refine filtering: warp After vacuum extruding machine refine, it is in-0.09MPa at relative vacuum degree and carries out, then filter through filter；(7) use horizontal very Empty extruder for shaping；(8) it is dried: fumigate 2 hours initially with steam, can produce by pre-Anti-cracking, be then placed in microwave Stove, microwave drying 15 minutes, it is re-fed into air stove and uses hot air drying 1 hour；(9) cutting, sintering: blank is cut, Then burn till in nitridation room, be raised to 1400 DEG C from room temperature, programming rate 50 DEG C/min, it is incubated 2～2.5 at 1400 DEG C Hour；Then it is raised to 1550～1600 DEG C from 1400 DEG C: programming rate 25 DEG C/min, little at 1550～1600 DEG C of insulation 2.5-3 Time, maximum sintering temperature 1600 DEG C, prepare finished product after firing time 96h.
Organic binder bond, polyethylene glycol oxide, polyvinyl alcohol, the addition of wetting agent, and the old process of secondary, can allow pottery Ceramic powder forms mixing pug network the finest and close, uniform.
In dry run, first steam is fumigated 2 hours, can produce by pre-Anti-cracking, is then placed in microwave oven, microwave drying Air stove can be re-fed into and uses hot air drying 1 hour with overall reduction pug moisture content, it is thus achieved that most suitable moisture content.This Sample both can prevent wet base from not ftractureing in dry run as far as possible, plays a part again to reduce mud material forming pressure in molding.
The positioning convex strip of honeycomb ceramics coordinates with detent, is possible to prevent airflow hole between two honeycomb ceramics upper and lower end faces wrong Position phenomenon occurs.The axial notch set up adds somewhat to the heat storage porosity, improves heat storage heat exchanger effectiveness.
The present invention has good processability and conformal performance.Use inventive formulation and production method, accumulation of heat body opening Road is intensive, and wall thickness is thin, and wall thickness is only 1mm, and sectional dimension is big, and sectional dimension is more than 100cm2, draw ratio is high, and length reaches 1000mm, the features such as it is little that all ducts have resistance, and dust stratification is few, is not easily blocked, and dust discharge is functional.Can significantly subtract after installation Airflow hole inconsistent phenomenon between few two honeycomb ceramics is the most unimpeded along the passage of airflow direction.And heat storage stores exothermicity Energy, anti-wear performance, corrosion resistance and good, thermal shock resistance is good, heat exchange efficiency is high, thus economize on resources, environmental protection Novel product.
Accompanying drawing explanation
Shown in Fig. 1 be cross section of the present invention be foursquare structural representation.
Detailed description of the invention
Below in conjunction with detailed description of the invention, technical scheme is described in further detail.
As it is shown in figure 1, the cross sectional shape of this silicon nitride large size ceramic heat storage is that square, rectangle etc. are polygon The one of shape, or the one of the shape such as semicircle, circle, arch, sector.Heat storage sectional dimension >=150mm, draw ratio >=3(i.e. cylinder length and cross section circumscribed circle diameter ratio >=3), it is provided with size inside heat storage uniformly and in parallel or staggered row The duct 1 of row, the shape in cross section, duct 1 selects according to the actual requirements: can be many for square, triangle, pentagon, hexagon etc. A kind of or semicircle, circular, the arch of limit shape, the combination of one or more fan-shaped various shapes.
Embodiment one:
The preparation technology of this silicon nitride large size ceramic heat storage, its preparation technology is: the heat accumulating type honeycomb cross-section of making Square；(1) it is dry mixed, first inorganic powder is added in ball mill, be dry mixed 4 hours, cross the screen cloth of 100 mesh, inorganic powder Component including following weight proportion:
Carborundum 61 weight portion, silica flour 11 weight portion, silicon nitride 6 weight portion, alumina powder 3 weight portion, silicon dioxide 3 weight Part, calcium oxide 1.5 weight portion；(2) doping, additive component is hydroxyethyl cellulose 4 weight portion, polyvinyl alcohol 1 weight Part, polyethylene glycol oxide 1 weight portion, (PEG400) 2 weight portion；(3) mediate, add while stirring in kneader water and Lubricating oil, during kneading, after adding 400kg material, divides 5 times while stirring and adds water, and water continues after adding to stir 5 minutes and disposable Add Oleum Verniciae fordii, after 20 minutes, stop stirring；(4) just practice, be in-0.09MPa just white silk through vacuum extruding machine at relative vacuum degree, Practice into closely knit pug block；(5) old, carry out old in pug block is placed in the ageing silo that environment is 3 DEG C, old time 5h, Carry out old in pug block is placed in the ageing silo that environment is 8 DEG C again, old time 26h；(6) refine, filters, then squeezes through vacuum After machine refine processed, it is in-0.09MPa at relative vacuum degree and carries out, then filter through filter；(7) extrusion molding, squeezes horizontal Go out machine and be extruded into the wet base of 540mm length；(8) fumigate 2 hours initially with steam, be then placed in microwave oven, microwave drying 15 minutes, It is re-fed into air stove and uses hot air drying 1 hour；(9) cutting, sintering: blank is cut, then carry out in nitridation room Burn till, be first raised to 1400 DEG C from room temperature, programming rate 50 DEG C/min, it is incubated 2～2.5 hours at 1400 DEG C；Then from 1400 DEG C are raised to 1550～1600 DEG C: programming rate 25 DEG C/min, are incubated 2.5-3 hour at 1550～1600 DEG C, firing time Finished product is prepared after 96h.
Performance indications: the size of finished product is 150mm × 150mm × 540mm.Resistant to sulfur acid attack rate 0.3wt%(GB/ T17601-2008)；Specific heat capacity 858J/Kg；Water absorption rate 4%；Heat shock resistance temperature 460 DEG C；Compressive resistance (axially): 62MPa；Resistance to Mill property 0.5 cm3.Finished product sectional dimension is big, and draw ratio is high, installs tailing edge airflow direction channels open, and resistance is little, and dust stratification is few.Real Border uses and shows: because of this, honeycomb ceramic heat accumulator size is big, shape is regular, and after installation, the duct 1 between honeycomb ceramics is to level Really, as long as along generally 12 pieces honeycomb ceramic heat accumulators series connection of airflow direction it is ensured that airway patency, allow whole regenerative apparatus Storage exothermicity, high-temperature behavior and thermal shock resistance be not fully exerted.
Embodiment two:
The preparation technology of this silicon nitride large size ceramic heat storage, its preparation technology is: the heat accumulating type honeycomb cross-section of making Square；(1) it is dry mixed, first inorganic powder is added in ball mill, be dry mixed 6 hours, cross the screen cloth of 80 mesh, inorganic powder bag Include the component of following weight proportion: carborundum 65 weight portion, silica flour 18 weight portion, silicon nitride 7 weight portion, alumina powder 4 weight Amount part, silicon dioxide 4 weight portion, calcium oxide 2 weight portion；(2) doping, additive component be methylcellulose 1 weight portion, Hydroxyethyl cellulose 1 weight portion, cyanethyl cellulose 3 weight portion, polyvinyl alcohol 1 weight portion, polyethylene glycol oxide 1 weight portion, poly- Propylene glycol 2 weight portion；(3) mediate, kneader adds water and lubricating oil while stirring, during kneading, after adding 400kg material, Dividing 3 times while stirring and add water, water continues stirring after adding and within 2 minutes, adds Oleum Verniciae fordii at twice, stops stirring after 30 minutes；(4) Just practice, be in-0.08MPa just white silk through vacuum extruding machine at relative vacuum degree, practice into closely knit pug block；(5) old by mud Material block carries out old in being placed in the ageing silo that environment is 3 DEG C, old time 5h, then pug block is placed in environment is 12 DEG C old Indoor carry out old, old time 24h；(6) refine, filters, then after vacuum extruding machine refine, relative vacuum degree be- 0.08MPa is carried out；(7) extrusion molding, is extruded into the wet base of 1050mm length at horizontal extruder；(8) 2 are fumigated initially with steam Hour, it is then placed in microwave oven, microwave drying 15 minutes, is re-fed into air stove and uses hot air drying 1 hour；(9) cutting, burns Knot: cut blank, then burns till in nitridation room, is first raised to 1400 DEG C from room temperature, programming rate 50 DEG C/minute Clock, is incubated 2～2.5 hours at 1400 DEG C；Then it is raised to 1550～1600 DEG C from 1400 DEG C: programming rate 25 DEG C/min, 1550～1600 DEG C are incubated 2.5-3 hour, prepare finished product after firing time 96h.
Performance indications: the size of finished product is 150mm × 150mm × 1050mm.Resistant to sulfur acid attack rate 0.32wt%(GB/ T17601-2008)；Specific heat capacity 859J/Kg；Water absorption rate 3%；Heat shock resistance temperature 460 DEG C；Compressive resistance (axially): 63MPa；Resistance to Mill property 0.6 cm3.Finished product sectional dimension is big, and draw ratio is high, installs tailing edge airflow direction channels open, and resistance is little, and dust stratification is few.Real Border uses and shows: because of this, honeycomb ceramic heat accumulator size is big, shape is regular, and after installation, the duct 1 between honeycomb ceramics is to level Really, as long as along generally 12 pieces honeycomb ceramic heat accumulators series connection of airflow direction it is ensured that airway patency, allow whole regenerative apparatus Storage exothermicity, high-temperature behavior and thermal shock resistance be not fully exerted.
Embodiment three:
The preparation technology of this silicon nitride large size ceramic heat storage, its preparation technology is: the heat accumulating type honeycomb cross-section of making It is rectangle；(1) it is dry mixed, first inorganic powder is added in ball mill, add in ball mill by required powder, be dry mixed 3 hours, Crossing the screen cloth of 80 mesh, inorganic powder includes the component of following weight proportion: carborundum 65 weight portion, silica flour 20 weight portion, nitridation Silicon 8 weight portion, alumina powder 6 weight portion, silicon dioxide 4 weight portion, calcium oxide 2 weight portion；(2) doping, additive Composition is methylcellulose 2 weight portion, cyanethyl cellulose 3 weight portion, polyvinyl alcohol 1 weight portion, polyethylene glycol oxide 1 weight Part, butanediol 3 weight portion；(3) mediate, kneader adds water and lubricating oil while stirring, during kneading, add 400kg material After, it is initially charged the water of half after stirring 15min, after continuing stirring 5 minutes, adds the Oleum Brassicae campestris of half, add surplus after spending 5 minutes Under water and Oleum Brassicae campestris, after 20 minutes stop stirring；(4) just practice, through vacuum extruding machine relative vacuum degree be- 0.08MPa just practices, practices into closely knit pug block；(5) old, carry out old in pug block is placed in the ageing silo that environment is 3 DEG C Corruption, old time 5h, then carry out in pug block is placed in the ageing silo that environment is 20 DEG C old, old time 26h；(6) refine, Filter, then after vacuum extruding machine refine, be in-0.09MPa at relative vacuum degree and carry out, then filter through filter；(7) squeeze Go out molding, be extruded into the wet base of 880mm length at horizontal extruder；(8) fumigate 2 hours initially with steam, be then placed in microwave oven, Microwave drying 15 minutes, is re-fed into air stove and uses hot air drying 1 hour；(9) cutting, sintering: blank is cut, then Nitridation room is burnt till, is first raised to 1400 DEG C from room temperature, programming rate 50 DEG C/min, it is incubated 2～2.5 at 1400 DEG C Hour；Then it is raised to 1550～1600 DEG C from 1400 DEG C: programming rate 25 DEG C/min, little at 1550～1600 DEG C of insulation 2.5-3 Time, prepare finished product after firing time 96h.
Performance indications: the size of finished product is 150mm × 150mm × 880mm.Resistant to sulfur acid attack rate 0.34wt%(GB/ T17601-2008)；Specific heat capacity 856J/Kg；Water absorption rate 4%；Heat shock resistance temperature 460 DEG C；Compressive resistance (axially): 62MPa；Resistance to Mill property 0.7cm3.Finished product sectional dimension is big, and draw ratio is high, installs tailing edge airflow direction channels open, and resistance is little, and dust stratification is few.Real Border uses and shows: because of this, honeycomb ceramic heat accumulator size is big, shape is regular, and after installation, the duct 1 between honeycomb ceramics is to level Really, as long as along generally 12 pieces honeycomb ceramic heat accumulators series connection of airflow direction it is ensured that airway patency, allow whole regenerative apparatus Storage exothermicity, high-temperature behavior and thermal shock resistance be not fully exerted.
Embodiment four:
The preparation technology of this silicon nitride large size ceramic heat storage, its preparation technology is: the heat accumulating type honeycomb cross-section of making Semicircular in shape；(1) it is dry mixed, first inorganic powder is added in ball mill, add in ball mill by required powder, be dry mixed 6 hours, Crossing the screen cloth of 120 mesh, inorganic powder includes the component of following weight proportion: carborundum 70 weight portion, silica flour 30 weight portion, nitridation Silicon 10 weight portion, alumina powder 8 weight portion, silicon dioxide 5 weight portion, calcium oxide 2.5 weight portion；(2) doping, adds Agent composition is methylcellulose 1 weight portion, cyanethyl cellulose 2 weight portion, polyvinyl alcohol 1 weight portion, polyethylene glycol oxide 2 weight Part, (PEG400) 3 weight portion；(3) mediate, kneader adds water and lubricating oil while stirring, during kneading, add After 400kg material, disposably add water after stirring 20min, add all of Oleum Brassicae campestris after continuing stirring 5 minutes, mediated 30 points Stirring is stopped after clock；(4) just practice, be at relative vacuum degree through vacuum extruding machine～0.08MPa just practices, practicing into closely knit mud Material block；(5) old, carry out old in pug block is placed in the ageing silo that environment is 3 DEG C, old time 5h, then pug block is put Carry out old in the ageing silo that environment is 25 DEG C, old time 29h；(6) refine, filters, then after vacuum extruding machine refine, It is in-0.06MPa at relative vacuum degree and carries out, then filter through filter；(7) extrusion molding, it is extruded at horizontal extruder The wet base of 660mm length；(8) fumigate 2 hours initially with steam, be then placed in microwave oven, microwave drying 15 minutes, be re-fed into heat Wind furnace uses hot air drying 1 hour；(9) cutting, sintering: cut blank, then burns till, first in nitridation room It is raised to 1400 DEG C from room temperature, programming rate 50 DEG C/min, it is incubated 2～2.5 hours at 1400 DEG C；Then it is raised to from 1400 DEG C 1550～1600 DEG C: programming rate 25 DEG C/min, it is incubated 2.5-3 hour at 1550～1600 DEG C, prepares after firing time 96h Finished product.
Performance indications: the size of finished product is 150mm × 150mm × 1000mm.Resistant to sulfur acid attack rate 0.34wt%(GB/ T17601-2008)；Specific heat capacity 859J/Kg；Water absorption rate 4%；Heat shock resistance temperature 460 DEG C；Compressive resistance (axially): 62MPa；Resistance to Mill property 0.6 cm3.Finished product sectional dimension is big, and draw ratio is high, installs tailing edge airflow direction channels open, and resistance is little, and dust stratification is few.Real Border uses and shows: because of this, honeycomb ceramic heat accumulator size is big, shape is regular, and after installation, the duct 1 between honeycomb ceramics is to level Really, as long as along generally 12 pieces honeycomb ceramic heat accumulators series connection of airflow direction it is ensured that airway patency, allow whole regenerative apparatus Storage exothermicity, high-temperature behavior and thermal shock resistance be not fully exerted.
Comparative example 1: the production method of novel heat-storing material comprises the following steps:
To ceramic powder (potassium feldspar 25%, mullite 65%, Kaolin 6%, α-Al2032%, boron nitride 2%) 75.5 parts add silicon Colloidal sol 4 parts, carboxymethyl cellulose 2 parts, ammonium chloride solution 0.2 part, glycerol 2 parts, polyvinyl alcohol 0.4 part, butyl silicate 5 parts, vinegar Vinyl acetate resin 4 parts and 12 parts of water carry out mixing, make pug；By pug by mould extrusion molding, make blank；By blank After drying, fire 12 hours in 1400 DEG C in sending into tunnel cave, get product.
The ceramic honey comb and the existing product that embodiment 1-4 are obtained are tested, and experimental result is as shown in the table:
Finally it is pointed out that above detailed description of the invention is only the more representational example of the present invention.Obviously, the present invention does not limits In above-mentioned detailed description of the invention, it is also possible to there are many deformation.Every technical spirit according to the present invention is to above specific embodiment party Any simple modification, equivalent variations and the modification that formula is made, is all considered as belonging to protection scope of the present invention.

Claims (4)

1. a silicon nitride large size ceramic heat storage, is characterized in that described heat storage is column structure, sets inside heat storage Having the duct of multiple through cylinder, described heat storage is sintered by inorganic powder and additive and forms, wherein inorganic powder include with The component of lower weight proportion: carborundum 60-70 weight portion, silica flour 10-30 weight portion, silicon nitride 5-10 weight portion, aluminium oxide are micro- Powder 2-8 weight portion, silicon dioxide 2-5 weight portion, calcium oxide 1.0-2.5 weight portion；The cross sectional shape of described heat storage is polygon Shape, semicircle, circle, arch, fan-shaped one, the cross sectional shape in described duct is polygon, semicircle, circle, arch, fan One or more combinations of shape, described heat storage cross section circumscribed circle diameter >=150mm, cylinder length and cross section circumscribed circle diameter ratio ≥3；Described preparation technology is: (1) is dry mixed: first add in ball mill by inorganic powder, is dry mixed 6～8 hours, crosses the sieve of 80 mesh Net；(2) doping, described additive component includes organic binder bond, plasticizer and wetting agent, by 100 parts of weights of inorganic powder Amount part calculate, wherein organic binder bond is 2.0～5.0 weight portions, and plasticizer is 0.5～3.0 weight portions, wetting agent be 0.5～ 3.0 weight portion；(3) mediate, kneader adds water and lubricant while stirring；(4) just practice: by pug at vacuum deairing machine On carry out just practicing, pug mill vacuum >=-0.05MPa when just practicing, practices into closely knit pug block, detect pug block moisture content, Index of plasticity；The moisture content of described pug block, index of plasticity be: moisture content 28～32%, extrusion force plasticity 1700～ 2200N；(5) old: to carry out old in pug block is placed in the ageing silo that environment is 3 DEG C, old time 5h, then pug block is put Carry out old in the ageing silo that environment is 8～25 DEG C, old time >=24h；(6) refine filtering: through vacuum extruding machine essence After refining, it is in-0.09MPa at relative vacuum degree and carries out, then filter through filter；(7) horizontal vacuum extruder extrusion is used Molding；(8) it is dried: fumigate 2 hours initially with steam, can produce by pre-Anti-cracking, be then placed in microwave oven, microwave drying 15 Minute, it is re-fed into air stove and uses hot air drying 1 hour；(9) cutting, sintering: cut blank, then in nitridation room Burn till, be raised to 1400 DEG C from room temperature, programming rate 50 DEG C/min, it is incubated 2～2.5 hours at 1400 DEG C；Then from 1400 DEG C are raised to 1550～1600 DEG C: programming rate 25 DEG C/min, are incubated 2.5-3 hour at 1550～1600 DEG C, the highest sintering Temperature 1600 DEG C, prepares finished product after firing time 96h.
The preparation technology of silicon nitride large size ceramic heat storage the most according to claim 1, is characterized in that described organic Binding agent is methylcellulose, hydroxyethyl cellulose, cyanethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, ethyl fibre One or more combinations in dimension element, polyvinyl alcohol, butyl silicate, vinyl acetate resin, modified starch.
The preparation technology of silicon nitride large size ceramic heat storage the most according to claim 1, is characterized in that described organic Plasticizer is the compositions of polyethylene glycol oxide, polyvinyl alcohol.
The preparation technology of silicon nitride large size ceramic heat storage the most according to claim 1, is characterized in that described moisturizing Agent is one or more in Polyethylene Glycol, glycerol, butanediol, propylene glycol, hexylene glycol, xylitol, polypropylene glycol, Sorbitol Combination；Described lubricant is one or more combinations of vegetable oil, mineral oil, vaseline.
CN201610433814.3A 2016-06-18 2016-06-18 A kind of silicon nitride large size ceramic heat storage and preparation technology thereof Pending CN106083144A (en)

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