CN107311628A - A kind of high-temperature crucible of face coat - Google Patents
A kind of high-temperature crucible of face coat Download PDFInfo
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- CN107311628A CN107311628A CN201710415274.0A CN201710415274A CN107311628A CN 107311628 A CN107311628 A CN 107311628A CN 201710415274 A CN201710415274 A CN 201710415274A CN 107311628 A CN107311628 A CN 107311628A
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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
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5053—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials non-oxide ceramics
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Abstract
The present invention relates to crucible technique field.The invention discloses a kind of high-temperature crucible of face coat, it is made up of corundum crucible and the coat of silicon carbide being coated on outside corundum crucible；Corundum crucible is made by raw materials such as schmigel, crystalline graphite powder, sericite, talcum powder and adhesive for granulating；Coat of silicon carbide is made by raw materials such as carbon source, silicon source and dispersants.High-temperature crucible results in homogeneity more base substrate after being particularly molded, can promote the efficiency of follow-up sintering technique in preparation process in the present invention；The high-temperature crucible being prepared has a higher consistency, the consistency of most samples up to 97% and more than；The present invention obtains a kind of high-temperature crucible with higher heat resisting temperature by way of coating on the premise of low cost is kept.
Description
Technical field
The present invention relates to crucible technique field, more particularly, to a kind of high-temperature crucible of face coat.
Background technology
Crucible is a kind of conventional experiment and production equipment, either in the growth preparation process of crystalline material, still
In the building-up process of powder body material, the participation of crucible is all be unable to do without, the quality of crucible often influences the preparation of these materials
Process and the performance for being prepared material.In the prior art, crucible is generally sintered and is prepared again using powder shaping, its
Middle shaping is an important ring in whole crucible preparation process, the uniformity and compactness of shaping can to the sintering process of crucible and
The performance of the final obtained crucible of sintering produces tremendous influence；Existing crucible shaping or even the shaping of all powder body materials are big
All using techniques such as pressure forming, isostatic pressings, wherein isostatic pressing is that uniform in shaping and shaping compactness are best
Molding mode, but it generally requires and carried out under oil pressure environment, it is more complicated to there is moulding process, and former cost is high, behaviour
Be required height, the shortcomings of molding time is also longer in addition, for need to improve shaping efficiency and reduce the crucible of shaping cost into
Type is relatively not suitable for；Mechanical pressing by the way of applying unilateral pressure to powder typically using being molded, because it is in forming process
There is provided unilateral pressure so that its base substrate unbalance stress in forming process, pressure side stress is larger, the side away from pressure
Stress is smaller, and unbalance stress causes compactness also heterogeneity, and stress side is more closely knit, and opposite side then has more skies
Gap, this uneven closely knit situation produces larger adverse effect when can be sintered to crucible, is needed for the more side in space
Control sintering rate and enable the movement of crystal boundary in base substrate more slowly so that gas and impurity be excluded outside crystal grain rather than by
Crystal grain is wrapped up, and closely knit side then needs to accelerate the rate travel of base substrate crystal boundary in sintering process, improves sintering efficiency；Mirror
In this situation, must control sintering rate during sintering is enough slow, improves the sintering effect of base substrate, but inevitably
It can influence to sinter efficiency, while there is also the sintering effect of the high side of influence compactness；Accordingly, it would be desirable to which one kind can be molded
The powder body material of base substrate compactness and the uniformity can be promoted in journey.
Existing conventional crucible is generally corundum, 95 porcelain, and 99 town of porcelains are conventional corundum crucibles, its mostly by purity compared with
High aluminum oxide is directly fired and formed, and the temperature that it can be acted on is also higher, up to 1700 DEG C or so, can meet most of materials
It is synthetically prepared；But wherein also have a problem often ignored, under nearly 1700 DEG C of hot environment, due to
It is fairly close to the fusing point of aluminum oxide, although corundum crucible is now also unlikely to fail or damage, but the aluminum oxide on its surface
Composition have high activity, these have high active aluminium ion, oxygen atom can enter crucible in react
In reactant, for structural material, the influence that the foreign ion of these micro contents is produced is relatively small, it might even be possible to neglect
Slightly disregard, but for some functional materials, the intrusion of some impurity, even the few impurity intrusion of content also can be big
Its corresponding performance is influenceed greatly；Turn into a feasible selection from the material with higher heat resisting temperature, but using has
The material of higher heat resisting temperature can then accordingly increase experiment/production cost.
The content of the invention
To solve the above problems, can be provided at lower cost with more preferable resistance to elevated temperatures the invention provides one kind,
And with higher-density, the face coat high-temperature crucible of homogeneity.
To achieve the above object, the technical solution adopted by the present invention is as follows：
A kind of high-temperature crucible of face coat, it is made up of corundum crucible and the coat of silicon carbide being coated on outside corundum crucible；
The weight of coat of silicon carbide is the 3~7% of corundum crucible weight；
Corundum crucible is made by the raw material of following parts by weight：Alumina content is 99~99.5wt% 100 parts of schmigel, scale
0.05~0.15 part of graphite powder, 0.3~0.8 part of sericite, 0.3~0.5 part of talcum powder, 1.5~2.0 parts of adhesive for granulating；
Coat of silicon carbide is made by the raw material of following parts by weight：20~35 parts of carbon source, 35~47 parts of silicon source, 5~8 parts of dispersant.
One purpose of technical solution of the present invention is in order to increase crucible green compact compactness and homogeneity, that is, to cause in powder
It during shaping, can also obtain that the uniform compactness of powder is uniform and the high base substrate of compactness in the case where briquetting pressure is uneven, protect
Demonstrate,prove the homogeneity of base substrate；Above-mentioned purpose is obtained by two methods, one is the particle diameter distribution of rational allocation powder；Second side
Method be added in powder it is a certain amount of can increase the additive of powder fluidity, these additives are with crystalline flake graphite and talcum
Based on powder.In order to obtain have higher heat-resisting ability crucible, from alumina content for 98~99wt% corundum powder compared with
Suitably, and the corundum of high alumina content is originally a kind of refractory material with fabulous resistance to elevated temperatures.
Graphite is a kind of inorganic material of stratiform, and it has good greasy property, by increasing capacitance it is possible to increase the mobility of powder, but
It is due to that its constitution element is carbon, its refractoriness under air ambient is simultaneously bad, therefore, can only add a small part,
And removing of being tried one's best when being sintered after powder shaping；Sericite is a kind of aluminium silicate mineral, is also a kind of laminar silicic acid salt mine
Thing, it also has good greasy property, and the mobility of powder can be increased by being added in powder, and aluminium silicate mineral is also
A kind of material with good fire resistance, its a small amount of addition will not produce on the refractoriness of powder and deteriorate influence；Talcum powder
It is a kind of hydrous magnesium silicate mineral, it has good greasy property, while it also has very outstanding anti-greasy performance, its energy
Prevent to reunite between fine powder material.
Carbofrax material is a kind of new refractory material with higher heat resisting temperature, and surface after its coating sintering
It is more fine and close and smooth.Presoma is mixed to prepare using carbon source and silicon source in the present invention, is sintered after coating afterwards and is made corresponding
Coat of silicon carbide, improve crucible surface heat resistance；Because the part in material preparation process, being in contact with raw material becomes
For the coat of silicon carbide with higher heat resisting temperature, because reaction temperature is far below the fusing point of carborundum, the activity of carborundum is still
It is old weaker, in the material that its more difficult entrance is being synthesized, thus also prevent the material correlated performance that influence is being synthesized
Possibility, using this kind have coat of silicon carbide corundum crucible the less material of impurity content can be made.
Preferably, 15~20wt% is coarse grain footpath schmigel in schmigel, 45~55wt% is middle particle diameter schmigel, surplus
For fine grain schmigel.
Preferably, the particle diameter of coarse grain footpath schmigel is 250~350 mesh, the particle diameter of middle particle diameter schmigel is 700~1000
Mesh, the particle diameter of fine grain schmigel is 1200~1500 mesh；The median particle diameter D of coarse grain footpath schmigel50For 290~300 mesh, middle grain
The median particle diameter D of footpath schmigel50For 800~900 mesh, the median particle diameter D of fine grain schmigel50For 1350~1400 mesh.
To make the base substrate of acquisition that there is the higher uniformity and compactness, it is ensured that the homogeneity of base substrate, also in crucible
Gas during sintering between powder granule can be excluded preferably, it is necessary to which the particle diameter distribution of rational allocation powder is so that medium grain size
Powder accounts for major part, so can both fill up compared with the space between coarse granule, reduces the gas content in base substrate after shaping, also may be used
With avoid when fine grain particle be in the great majority brought powder particles reunite the problem of, through test medium grain size powder account for
45wt% or so, then the minimum allocative decision of minimum thicker particles, which can try one's best, make the space between powder minimum, carefully
Agglomeration between particle is also minimum
The particle diameter of coarse grain footpath powder is in the range of 250~350 mesh, about 42~60 microns, the particle diameter of middle particle diameter powder
In the range of 700~1000 mesh, about 15~21 microns, the particle diameter of fine grain powder is 1200~1500 mesh scopes
It is interior, about 10~12 microns；Such particle diameter distribution can cause, fine grain powder can just fill up coarse grain footpath and
The space formed after middle particle diameter powder mixing, enables to powder to reach most compact state in theory；It is aided with mobility simultaneously
Additive, being distributed each several part in powder can be close to such ideal distribution state.
Preferably, the polyvinyl alcohol ethanol solution that it is 5% that pelletizing additives, which are percetage by weight,.
Preferably, carbon source is one kind in lignin, starch, sucrose or sodium alginate.
Lignin, starch, sucrose and sodium alginate etc. are all common carbon containing organic polymers, and its phosphorus content is higher,
And it is added in the aqueous solution（As in Ludox）The viscosity of solution can also be increased, coating so can be more easily prepared
Layer.
Preferably, silicon source is the Ludox that silica weight percentage is 60~70%.
Preferably, dispersant is odium stearate or sodium carboxymethylcellulose.
Face coat high-temperature crucible in the present invention can be made by following steps：
a）Get the raw materials ready：
b）Raw material for crucible batch mixing；
c）Mixed powder is granulated；
d）Crucible is molded：The mixed powder granulated is added to compression molding in mould crucible green compact are made；
e）Crucible is sintered：Crucible green compact are risen to 600 DEG C and be incubated 1 hour dumping by room temperature and arrange carbon；Temperature is continued afterwards to rise
To 1400 DEG C, and be incubated 4 hours and sinter, after the completion of be naturally cooling to room temperature, high-temperature crucible crude product is made；
f）It is prepared by coating paste：Dispersant is added in silicon source and stirred, carbon source is then added thereto again, and stir
Coating paste is made；
g）Coating：By in high-temperature crucible crude product immersion coating slurry, after slurry is completely covered after high-temperature crucible crude product surface
Take out and dry, face coat high-temperature crucible crude product is made；
h）Coating is sintered：By face coat high-temperature crucible crude product by room temperature to 1400 DEG C in nitrogen environment insulation it is 2 small
When, room temperature is subsequently cooled to, face coat high-temperature crucible is made.
Therefore, the invention has the advantages that：
（1）High-temperature crucible of the present invention is in forming process, and yields more preferably, in forming process is difficult because of powder unbalance stress
It is broken；
（2）High-temperature crucible results in homogeneity more base substrate, energy in preparation process after being particularly molded in the present invention
Enough promote the efficiency of follow-up sintering technique；
（3）The high-temperature crucible being prepared in the present invention has a higher consistency, and the consistency of most samples is up to 97%
And more than；
（4）The present invention obtains a kind of resistance to higher heat resisting temperature by way of coating on the premise of low cost is kept
High-temperature crucibles.
Embodiment
Technical scheme is further described with reference to embodiment.
Obviously, described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on this
Embodiment in invention, all other reality that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example is applied, the scope of protection of the invention is belonged to.
Embodiment 1
A kind of high-temperature crucible of face coat, it is made up of corundum crucible and the coat of silicon carbide being coated on outside corundum crucible；
The weight of coat of silicon carbide is the 3% of corundum crucible weight；
Corundum crucible is made by the raw material of following parts by weight：Alumina content is 99wt% 100 parts of schmigel, crystalline graphite powder
0.05 part, 0.38 part of sericite, 0.3 part of talcum powder, 1.5 parts of adhesive for granulating；
15wt% is coarse grain footpath schmigel in schmigel, and 45wt% is middle particle diameter schmigel, and 40wt% is fine grain schmigel；Coarse grain
The particle diameter of footpath schmigel is 250~350 mesh, its median particle diameter D50For 290 mesh, the particle diameter of middle particle diameter schmigel is 700~1000
Mesh, its median particle diameter D50For 800 mesh, the particle diameter of fine grain schmigel is 1200~1500 mesh, its median particle diameter D50For 1350
Mesh；Pelletizing additives are the polyvinyl alcohol ethanol solution that percetage by weight is 5%；
Coat of silicon carbide is made by the raw material of following parts by weight：20 parts of carbon source, 35 parts of silicon source, 5 parts of dispersant；Carbon source is wooden
Element；Silicon source is the Ludox that silica weight percentage is 60%；Dispersant is odium stearate.
Face coat high-temperature crucible in the embodiment can be made by following steps：
a）Get the raw materials ready：
b）Raw material for crucible batch mixing；
c）Mixed powder is granulated；
d）Crucible is molded：The mixed powder granulated is added to compression molding in mould crucible green compact are made；
e）Crucible is sintered：Crucible green compact are risen to 600 DEG C and be incubated 1 hour dumping by room temperature and arrange carbon；Temperature is continued afterwards to rise
To 1400 DEG C, and be incubated 4 hours and sinter, after the completion of be naturally cooling to room temperature, high-temperature crucible crude product is made；
f）It is prepared by coating paste：Dispersant is added in silicon source and stirred, carbon source is then added thereto again, and stir
Coating paste is made；
g）Coating：By in high-temperature crucible crude product immersion coating slurry, after slurry is completely covered after high-temperature crucible crude product surface
Take out and dry, face coat high-temperature crucible crude product is made；
h）Coating is sintered：By face coat high-temperature crucible crude product by room temperature to 1400 DEG C in nitrogen environment insulation it is 2 small
When, room temperature is subsequently cooled to, face coat high-temperature crucible is made.
Embodiment 2
A kind of high-temperature crucible of face coat, it is made up of corundum crucible and the coat of silicon carbide being coated on outside corundum crucible；
The weight of coat of silicon carbide is the 7% of corundum crucible weight
Corundum crucible is made by the raw material of following parts by weight：Alumina content is 99.5wt% 100 parts of schmigel, crystalline flake graphite
0.15 part, 0.8 part of sericite, 0.5 part of talcum powder, 2.0 parts of adhesive for granulating；
20wt% is coarse grain footpath schmigel in schmigel, and 55wt% is middle particle diameter schmigel, and 25wt% is fine grain schmigel；Coarse grain
The particle diameter of footpath schmigel is 250~350 mesh, its median particle diameter D50For 300 mesh, the particle diameter of middle particle diameter schmigel is 700~1000
Mesh, its median particle diameter D50For 900 mesh, the particle diameter of fine grain schmigel is 1200~1500 mesh, its median particle diameter D50For 1400
Mesh；Pelletizing additives are the polyvinyl alcohol ethanol solution that percetage by weight is 5%；
Coat of silicon carbide is made by the raw material of following parts by weight：35 parts of carbon source, 47 parts of silicon source, 8 parts of dispersant；Carbon source is alginic acid
Sodium；Silicon source is the Ludox that silica weight percentage is 70%；Dispersant is sodium carboxymethylcellulose.
Face coat high-temperature crucible in the embodiment can be made by following steps：
a）Get the raw materials ready：
b）Raw material for crucible batch mixing；
c）Mixed powder is granulated；
d）Crucible is molded：The mixed powder granulated is added to compression molding in mould crucible green compact are made；
e）Crucible is sintered：Crucible green compact are risen to 600 DEG C and be incubated 1 hour dumping by room temperature and arrange carbon；Temperature is continued afterwards to rise
To 1400 DEG C, and be incubated 4 hours and sinter, after the completion of be naturally cooling to room temperature, high-temperature crucible crude product is made；
f）It is prepared by coating paste：Dispersant is added in silicon source and stirred, carbon source is then added thereto again, and stir
Coating paste is made；
g）Coating：By in high-temperature crucible crude product immersion coating slurry, after slurry is completely covered after high-temperature crucible crude product surface
Take out and dry, face coat high-temperature crucible crude product is made；
h）Coating is sintered：By face coat high-temperature crucible crude product by room temperature to 1400 DEG C in nitrogen environment insulation it is 2 small
When, room temperature is subsequently cooled to, face coat high-temperature crucible is made.
Embodiment 3
A kind of high-temperature crucible of face coat, it is made up of corundum crucible and the coat of silicon carbide being coated on outside corundum crucible；
The weight of coat of silicon carbide is the 6% of corundum crucible weight；
Corundum crucible is made by the raw material of following parts by weight：Alumina content is 99wt% 100 parts of schmigel, crystalline graphite powder
0.05 part, 0.7 part of sericite, 0.5 part of talcum powder, 1.6 parts of adhesive for granulating；
18wt% is coarse grain footpath schmigel in schmigel, and 47wt% is middle particle diameter schmigel, and 35wt% is fine grain schmigel；Coarse grain
The particle diameter of footpath schmigel is 270~310 mesh, its median particle diameter D50For 290 mesh, the particle diameter of middle particle diameter schmigel is 750~850
Mesh, its median particle diameter D50For 800 mesh, the particle diameter of fine grain schmigel is 1300~1400 mesh, its median particle diameter D50For 1350
Mesh；Pelletizing additives are the polyvinyl alcohol ethanol solution that percetage by weight is 5%；
Coat of silicon carbide is made by the raw material of following parts by weight：25 parts of carbon source, 40 parts of silicon source, 6 parts of dispersant；Carbon source is starch；
Silicon source is the Ludox that silica weight percentage is 65%；Dispersant is odium stearate.
Face coat high-temperature crucible in the embodiment can be made by following steps：
a）Get the raw materials ready：
b）Raw material for crucible batch mixing；
c）Mixed powder is granulated；
d）Crucible is molded：The mixed powder granulated is added to compression molding in mould crucible green compact are made；
e）Crucible is sintered：Crucible green compact are risen to 600 DEG C and be incubated 1 hour dumping by room temperature and arrange carbon；Temperature is continued afterwards to rise
To 1400 DEG C, and be incubated 4 hours and sinter, after the completion of be naturally cooling to room temperature, high-temperature crucible crude product is made；
f）It is prepared by coating paste：Dispersant is added in silicon source and stirred, carbon source is then added thereto again, and stir
Coating paste is made；
g）Coating：By in high-temperature crucible crude product immersion coating slurry, after slurry is completely covered after high-temperature crucible crude product surface
Take out and dry, face coat high-temperature crucible crude product is made；
h）Coating is sintered：By face coat high-temperature crucible crude product by room temperature to 1400 DEG C in nitrogen environment insulation it is 2 small
When, room temperature is subsequently cooled to, face coat high-temperature crucible is made.
Embodiment 4
A kind of high-temperature crucible of face coat, it is made up of corundum crucible and the coat of silicon carbide being coated on outside corundum crucible；
The weight of coat of silicon carbide is the 5% of corundum crucible weight；
Corundum crucible is made by the raw material of following parts by weight：Alumina content is 99wt% 100 parts of schmigel, crystalline graphite powder
0.10 part, 0.55 part of sericite, 0.4 part of talcum powder, 1.75 parts of adhesive for granulating；
17.5wt% is coarse grain footpath schmigel in schmigel, and 50wt% is middle particle diameter schmigel, and 32.5wt% is fine grain schmigel；
The particle diameter of coarse grain footpath schmigel is 250~350 mesh, its median particle diameter D50For 300 mesh, the particle diameter of middle particle diameter schmigel for 700~
1000 mesh, its median particle diameter D50For 900 mesh, the particle diameter of fine grain schmigel is 1200~1500 mesh, its median particle diameter D50For
1400 mesh；Pelletizing additives are the polyvinyl alcohol ethanol solution that percetage by weight is 5%；
Coat of silicon carbide is made by the raw material of following parts by weight：27.5 parts of carbon source, 41 parts of silicon source, 6.5 parts of dispersant；Carbon source is sugarcane
Sugar；Silicon source is the Ludox that silica weight percentage is 65%；Dispersant is sodium carboxymethylcellulose.
Face coat high-temperature crucible in the embodiment can be made by following steps：
a）Get the raw materials ready：
b）Raw material for crucible batch mixing；
c）Mixed powder is granulated；
d）Crucible is molded：The mixed powder granulated is added to compression molding in mould crucible green compact are made；
e）Crucible is sintered：Crucible green compact are risen to 600 DEG C and be incubated 1 hour dumping by room temperature and arrange carbon；Temperature is continued afterwards to rise
To 1400 DEG C, and be incubated 4 hours and sinter, after the completion of be naturally cooling to room temperature, high-temperature crucible crude product is made；
f）It is prepared by coating paste：Dispersant is added in silicon source and stirred, carbon source is then added thereto again, and stir
Coating paste is made；
g）Coating：By in high-temperature crucible crude product immersion coating slurry, after slurry is completely covered after high-temperature crucible crude product surface
Take out and dry, face coat high-temperature crucible crude product is made；
h）Coating is sintered：By face coat high-temperature crucible crude product by room temperature to 1400 DEG C in nitrogen environment insulation it is 2 small
When, room temperature is subsequently cooled to, face coat high-temperature crucible is made.
Embodiment 5
A kind of high-temperature crucible of face coat, it is made up of corundum crucible and the coat of silicon carbide being coated on outside corundum crucible；
The weight of coat of silicon carbide is the 5% of corundum crucible weight；
Corundum crucible is made by the raw material of following parts by weight：Alumina content is 99.5wt% 100 parts of schmigel, crystalline flake graphite
0.05 part of powder, 0.6 part of sericite, 0.5 part of talcum powder, 1.5 parts of adhesive for granulating；
18wt% is coarse grain footpath schmigel in schmigel, and 50wt% is middle particle diameter schmigel, and 32wt% is fine grain schmigel；Coarse grain
The particle diameter of footpath schmigel is 250~350 mesh, its median particle diameter D50For 300 mesh, the particle diameter of middle particle diameter schmigel is 700~900
Mesh, its median particle diameter D50For 800 mesh, the particle diameter of fine grain schmigel is 1300~1500 mesh, its median particle diameter D50For 1400
Mesh；Pelletizing additives are the polyvinyl alcohol ethanol solution that percetage by weight is 5%；
Coat of silicon carbide is made by the raw material of following parts by weight：25 parts of carbon source, 42 parts of silicon source, 6 parts of dispersant；Carbon source is alginic acid
Sodium；Silicon source is the Ludox that silica weight percentage is 65%；Dispersant is sodium carboxymethylcellulose.
Face coat high-temperature crucible in the embodiment can be made by following steps：
a）Get the raw materials ready：
b）Raw material for crucible batch mixing；
c）Mixed powder is granulated；
d）Crucible is molded：The mixed powder granulated is added to compression molding in mould crucible green compact are made；
e）Crucible is sintered：Crucible green compact are risen to 600 DEG C and be incubated 1 hour dumping by room temperature and arrange carbon；Temperature is continued afterwards to rise
To 1400 DEG C, and be incubated 4 hours and sinter, after the completion of be naturally cooling to room temperature, high-temperature crucible crude product is made；
f）It is prepared by coating paste：Dispersant is added in silicon source and stirred, carbon source is then added thereto again, and stir
Coating paste is made；
g）Coating：By in high-temperature crucible crude product immersion coating slurry, after slurry is completely covered after high-temperature crucible crude product surface
Take out and dry, face coat high-temperature crucible crude product is made；
h）Coating is sintered：By face coat high-temperature crucible crude product by room temperature to 1400 DEG C in nitrogen environment insulation it is 2 small
When, room temperature is subsequently cooled to, face coat high-temperature crucible is made.
Performance test：
1. compression molding yields：
After the completion of shaping count molding blank yields, wherein base substrate rupture, it is imperfect be considered as unqualified base substrate, through statistics
Be molded yields 96% and more than, and in the existing powder forming process of identical size, yields can barely reach that 90% is left
It is right；
2. the consistency of high-temperature crucible after sintering：
The bulk density of finished product is calculated by the dry weight, weightlessness, buoyant weight of testing finished product respectively, and obtained with raw material weighted average calculation
To solid density compare acquisition consistency, after tested the consistency of the finished product in above-described embodiment be 97% and more than, and show
The consistency for having structural ceramics in technology is 95% or so；
3. the refractoriness under load test of finished product：
The high temperature resistant being prepared according to the load softening point method of testing described in GB/T 5989-2008 to above-described embodiment
Crucible carries out load softening point test, after testing under the conditions of 0.2MPa, the high-temperature crucible that the various embodiments described above are prepared
Refractoriness under load be not less than 1800 DEG C.
It should be appreciated that to those skilled in the art, can according to the above description be improved or be become
Change, and all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (7)
1. a kind of high-temperature crucible of face coat, it is characterised in that：It is by corundum crucible and the carbon being coated on outside corundum crucible
SiClx coating is constituted；The weight of coat of silicon carbide is the 3~7% of corundum crucible weight；
Described corundum crucible is made by the raw material of following parts by weight：Alumina content is 99~99.5wt% schmigel 100
Part, 0.05~0.15 part of crystalline graphite powder, 0.3~0.8 part of sericite, 0.3~0.5 part of talcum powder, adhesive for granulating 1.5~
2.0 part；
Described coat of silicon carbide is made by the raw material of following parts by weight：20~35 parts of carbon source, 35~47 parts of silicon source, dispersant 5
~8 parts.
2. a kind of high-temperature crucible of face coat according to claim 1, it is characterised in that：
15~20wt% is coarse grain footpath schmigel in described schmigel, and 45~55wt% is middle particle diameter schmigel, and surplus is particulate
Footpath schmigel.
3. a kind of high-temperature crucible of face coat according to claim 2, it is characterised in that：
The particle diameter of described coarse grain footpath schmigel is 250~350 mesh, and the particle diameter of described middle particle diameter schmigel is 700~1000
Mesh, the particle diameter of described fine grain schmigel is 1200~1500 mesh；The median particle diameter D of described coarse grain footpath schmigel50For 290
~300 mesh, the median particle diameter D of described middle particle diameter schmigel50For 800~900 mesh, the intermediate value grain of described fine grain schmigel
Footpath D50For 1350~1400 mesh.
4. a kind of high-temperature crucible of face coat according to claim 1, it is characterised in that：
Described pelletizing additives are the polyvinyl alcohol ethanol solution that percetage by weight is 5%.
5. a kind of high-temperature crucible of face coat according to claim 1, it is characterised in that：
Described carbon source is one kind in lignin, starch, sucrose or sodium alginate.
6. a kind of high-temperature crucible of face coat according to claim 1, it is characterised in that：
Described silicon source is the Ludox that silica weight percentage is 60~70%.
7. a kind of high-temperature crucible of face coat according to claim 1, it is characterised in that：
Described dispersant is odium stearate or sodium carboxymethylcellulose.
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| CN116102355A (en) * | 2023-02-23 | 2023-05-12 | 宝兴易达光伏刃料有限公司 | Carbon crucible with small thermal expansion coefficient and preparation method thereof |
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