CN106518114B - The manufacture craft of ultralow-porosity, low thermal expansion fireclay refractory - Google Patents
The manufacture craft of ultralow-porosity, low thermal expansion fireclay refractory Download PDFInfo
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- CN106518114B CN106518114B CN201611014132.5A CN201611014132A CN106518114B CN 106518114 B CN106518114 B CN 106518114B CN 201611014132 A CN201611014132 A CN 201611014132A CN 106518114 B CN106518114 B CN 106518114B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 39
- 239000004927 clay Substances 0.000 claims abstract description 33
- 239000011449 brick Substances 0.000 claims abstract description 23
- 230000008569 process Effects 0.000 claims abstract description 20
- 238000000465 moulding Methods 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 239000011265 semifinished product Substances 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 238000004321 preservation Methods 0.000 claims abstract description 4
- 230000003647 oxidation Effects 0.000 claims abstract description 3
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 3
- 238000010304 firing Methods 0.000 claims description 25
- 238000011068 loading method Methods 0.000 claims description 13
- 238000002791 soaking Methods 0.000 claims description 5
- 238000005245 sintering Methods 0.000 abstract description 15
- 239000011521 glass Substances 0.000 abstract description 8
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 abstract description 5
- 238000009826 distribution Methods 0.000 abstract description 3
- 239000011819 refractory material Substances 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 12
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 8
- 239000000843 powder Substances 0.000 description 7
- 230000002829 reductive effect Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 239000012071 phase Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 239000010437 gem Substances 0.000 description 3
- 229910001751 gemstone Inorganic materials 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 229910052863 mullite Inorganic materials 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229920001732 Lignosulfonate Polymers 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- DLHONNLASJQAHX-UHFFFAOYSA-N aluminum;potassium;oxygen(2-);silicon(4+) Chemical class [O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Si+4].[Si+4].[Si+4].[K+] DLHONNLASJQAHX-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 239000002010 green coke Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229910052851 sillimanite Inorganic materials 0.000 description 1
- 238000007582 slurry-cast process Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 150000003609 titanium compounds Chemical class 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B33/00—Clay-wares
- C04B33/32—Burning methods
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/658—Atmosphere during thermal treatment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/77—Density
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention belongs to technical field of refractory materials, and in particular to the manufacture craft of a kind of ultralow-porosity, low thermal expansion fireclay refractory.The manufacture craft, using traditional semidry method mixing raw materials technique mixing, using conventional molding process molding making at semi-finished product green body, semi-finished product green body is in sintering process, reducing atmosphere is all made of in 1200 DEG C or more of heatings and the insulating process risen to after being burnt into maximum temperature, after heat preservation, switch to regular oxidation atmosphere.Using technique of the present invention, ultralow-porosity clay brick that the past can not all be made by the high-pressure molding of accurate grain size distribution, extreme, it is easy to make, so that the quality of fireclay refractory is got a promotion and is optimized to greatest extent；It can produce that refractoriness under load height, flat appearance, the porosity be extremely low, the fireclay refractory suitable for titanium sponge industry and glass industry of low thermal expansion.
Description
Technical field
The invention belongs to technical field of refractory materials, and in particular to a kind of ultralow-porosity, low thermal expansion clayey fire resisting
The manufacture craft of material.
Background technique
It makes low stomata clay brick and generallys use hard paste clinker (flint clay) as aggregate and main powder, addition is high
Alumina content powder adds mild-clay as room temperature binder and plasticizer as matrix is strengthened.
Traditional low stomata clay brick manufacture craft is as follows:
1) planetary mixer or similar mechanical progress pug mixing are generallyd use, is kneaded program are as follows: firstly, bone is added
Material mixes in kneading machine, then, suitable lignosulfonates electrolyte aqueous solution is added and mixes, adds all powders
It is rolled in kneading machine and is mixed into semidry method pug.The mixing program is traditional semidry method mixing raw materials technique.
2) friction press or hydraulic press are generallyd use to form semidry method pug, is fabricated to semi-finished product green body.
3) it generallys use double of finished base substrate of tunnel oven or shuttle kiln to be burnt into, is fabricated to low stomata clay brick, be burnt into
Atmosphere is usually weak oxide atmosphere, and firing temperature is generally at 1330-1380 DEG C.
4) to reduce the porosity, there are also the methods for promoting agglutinant using addition potassium feldspar class, occur in sintering process lower
Temperature glass phase forms liquid-phase sintering, and closed porosity increases, and apparent porosity reduces, but high-temperature behavior becomes negatively affected,
Load softening point temperature reduces, and high temperature creep rate increases.
5) the low stomata clay brick that can be made under above process conditions, the porosity are minimum close in 12-15%, volume
Degree is in 2.30g/cm3Above, 0.2MPa loading softening starting point 1500 DEG C, 1000 DEG C of coefficient of thermal expansions 0.6% or more it is low
Stomata clay brick.
6) under the conditions of process above, firing temperature is more than 1380 DEG C, then clay brick product surface strumae occurs, outside
Surface irregularity, porosity decline is unobvious, thermal-shock resistance reduction.
7) under the conditions of process above, by changing size distribution, briquetting pressure, the pole that the porosity of product reduces are increased
Limit value is 11-12%.
The variation of customer demand: start to occur requiring the porosity to be reduced to 10% ultralow stomata below in glass industry viscous
Cob brick demand occurs that the porosity is required to be reduced to 5% extremely low stomata clay brick demand below in titanium sponge industry.
Therefore, the high grade clay brick that innovative development manufactures ultralow stomata and the extremely low porosity manufactures new technique and very must
It wants.
Summary of the invention
In view of the deficiencies of the prior art, the object of the present invention is to provide a kind of ultralow-porosity, low thermal expansion clayey are resistance to
It is extremely low, low thermal expansion suitable can to produce refractoriness under load height, flat appearance, the porosity for the manufacture craft of fiery material
Fireclay refractory for titanium sponge industry and glass industry.
The manufacture craft of ultralow-porosity of the present invention, low thermal expansion fireclay refractory, using traditional half
Dry method mixing raw materials technique mixing, using conventional molding process molding making at semi-finished product green body, semi-finished product green body had been burnt into
Cheng Zhong is all made of reducing atmosphere, heat preservation knot in 1200 DEG C or more of heatings and the insulating process risen to after being burnt into maximum temperature
Shu Hou switchs to regular oxidation atmosphere.
The reducing atmosphere CO concentration is controlled in 10000ppm or more.
Preferably, 5% or less the porosity, bulk density 2.50g/cm are made3Above, 0.2MPa loading softening starting point exists
When the extremely low porosity low thermal expansion clay brick of 1600 DEG C or more, 1000 DEG C coefficient of thermal expansions 0.46%, firing maximum temperature is
1550-1600 DEG C, soaking time 6-48h, preferably 8-12h.
Preferably, 10% or less the porosity, bulk density 2.45g/cm are made3Above, 0.2MPa loading softening starting point
In 1500 DEG C or more of ultralow-porosity clay brick, firing maximum temperature is 1500-1550 DEG C, soaking time 6-48h, excellent
It is selected as 12h.
Preferably, 12% or less the porosity, bulk density 2.40g/cm are made3Above, 0.2MPa loading softening starting point
In 1500 DEG C or more of advanced low-porosity clay brick, firing maximum temperature is 1450-1500 DEG C, soaking time 6-48h,
Preferably 12h.
The raw material that the present invention uses is identical as conventional clay fire resistant materials, and aggregate is that alumina content is 43-50% coke
Jewel clinker or alumina content are 40-50% synthesis homogenizing Mullite grogs；Powder is the high temperature oxygen that granularity is 180-320 mesh
Change aluminium powder or sillimanite mineral suite fine powder；Plasticizer and room temperature bonding agent are mild-clay；Electrolyte solution is sulfomethylated lignin
Hydrochlorate serial solution or other electrolyte dispersing agents.
The molding mode of use are as follows: using friction press, hydraulic forming machine or iso-static pressure shaping machine molding, or use
Slurry casting mode.
Sintering mechanism of the present invention:
(1) flint clay feature: flint clay belongs to hard paste mineral, and the green coke jewel newly exploited is block material, stratiform
Microstructure, 1250 DEG C or so firing density reach maximum, become commercial goods flint clay clinker.Its firing temperature is improved again,
Due to formation mullite and cristobalite crystal grain is grown up and phase transformation, cause layer structure to produce crack, bulk density drops instead
It is low.
(2) mainly using commercially available flint clay clinker as aggregate and main powder, firing temperature is more than traditional clay brick
After 1380 DEG C, flint clay clinker in adobe generates violent irregular expansion and stratiform internal crack, leads to product surface
Strumae is generated, volume expansion counteracts high temperature sintering volume contraction factor, and the porosity does not decline or decline unobvious.
(3) firing process of the present invention is used, 1200 DEG C or more is warming up to, switchs to reducing atmosphere.
A small amount of Fe under the conditions of reductive firing, in product green body in flint clay clinker2O3And TiO2Impurity, be reduced into compared with
The ferrous oxide FeO of low melting point and the protoxide of titanium produce the glass phase compared with low melting point, form liquid-phase sintering, lead to coke
Jewel densification, forms the compact texture that microstructure fills glass phase between mullite grains.
In this sintering process, the porosity of product is constantly reduced, the density of product constantly increases.Firing temperature is higher,
Sintering is more violent, and the porosity is lower, and bulk density is bigger.
Flint clay clinker in this sintering process, product green body is unanimously shunk, and will not generate expansion and crack, macroscopical table
Now for product surface it is smooth, without strumae object.
(4) terminate in firing highest temperature heat preservation, after switching to oxidizing atmosphere, the sub- oxygen of base intracorporal ferrous oxide FeO and titanium
Compound is constantly oxidized, and the fusing point of low melting glass phase is continuously improved, and the high-temperature behavior of product improves, and load softening point temperature mentions
It is high.
(5) firing mode of the invention is used, the porosity of fireclay refractory can be reduced to greatest extent,
Bulk density is improved to greatest extent, high-temperature behavior is improved to greatest extent.
In conclusion beneficial effects of the present invention are as follows:
(1) use technique of the present invention, by the past by accurate grain size distribution, extreme high-pressure molding all without legal system
The ultralow-porosity clay brick of work, it is easy to make, mention the quality of fireclay refractory to greatest extent
It rises and optimizes.
(2) technique of the present invention is used, it is extremely low, hot that refractoriness under load height, flat appearance, the porosity can be produced
The low fireclay refractory suitable for titanium sponge industry and glass industry of expansion rate.
(3) technique of the present invention is used, 5% or less the porosity, bulk density 2.50g/cm can be produced3Above,
Extremely low porosity low thermal expansion clay of the 0.2MPa loading softening starting point in 1600 DEG C or more, 1000 DEG C coefficient of thermal expansions 0.46%
Brick.
(4) technique of the present invention is used, 10% or less the porosity, bulk density 2.45g/cm can be produced3Above,
Ultralow-porosity clay brick of the 0.2MPa loading softening starting point at 1500 DEG C or more.
(5) technique of the present invention is used, 12% or less the porosity, bulk density 2.40g/cm can be produced3Above,
Advanced low-porosity clay brick of the 0.2MPa loading softening starting point at 1500 DEG C or more.
Specific embodiment
Below with reference to embodiment, the present invention will be further described.
All raw materials used in the examples are commercially available.
The physical and chemical index of primary raw material used in the examples is shown in Table 1.
The physical and chemical index of 1 primary raw material of table
Wherein, the loss on ignition of Guangxi soil and Suzhou soil is 14%.
Embodiment 1-2
Prepare surfacing, 12% or less the porosity, bulk density 2.40g/cm3Above, 0.2MPa loading softening starts
O'clock in 1500 DEG C or more of advanced low stomata clay brick.
The composition of raw materials of use is shown in Table 5.
It proportionally after mixing, is formed using friction press, is burnt into after semi-finished product body drying after molding, burnt
At maximum temperature be 1480 DEG C, firing time be 12 hours, 1200 DEG C or more of heating and rise to firing maximum temperature after guarantor
Reducing atmosphere is all made of during temperature, CO concentration is greater than 10000PPm.Sintering process conditional control parameter is shown in Table 2.
2 embodiment 1-2 sintering process conditional control parameter of table
The performances such as bulk density, the porosity, cold crushing strength, refractoriness under load of product, detection after test firing
It the results are shown in Table 6.
Embodiment 3-4
Prepare 10% or less the porosity, bulk density 2.45g/cm3Above, 0.2MPa loading softening starting point is at 1500 DEG C
Above ultralow stomata clay brick.
The composition of raw materials of use is shown in Table 5.
It proportionally after mixing, is formed using friction press, is burnt into after semi-finished product body drying after molding, burnt
At maximum temperature be 1530 DEG C, firing time be 12 hours, 1200 DEG C or more of heating and rise to firing maximum temperature after guarantor
Reducing atmosphere is all made of during temperature, CO concentration is greater than 10000PPm.Sintering process conditional control parameter is shown in Table 3.
3 embodiment 3-4 sintering process conditional control parameter of table
The performances such as bulk density, the porosity, cold crushing strength, refractoriness under load of product, detection after test firing
It the results are shown in Table 6.
Embodiment 5-7
Prepare the porosity 1.05%, bulk density 2.58g/cm3Above, 0.2MPa loading softening starting point 1636 DEG C,
The fireclay refractory of 1000 DEG C of coefficient of thermal expansions 0.46%.
The composition of raw materials of use is shown in Table 5.
It proportionally after mixing, is formed using friction press, is burnt into after semi-finished product body drying after molding, burnt
At maximum temperature be 1600 DEG C, firing time be 12 hours, 1200 DEG C or more of heating and rise to firing maximum temperature after guarantor
Reducing atmosphere is all made of during temperature, CO concentration is greater than 10000PPm.Sintering process conditional control parameter is shown in Table 4.
4 embodiment 5-7 sintering process conditional control parameter of table
The performances such as bulk density, the porosity, cold crushing strength, refractoriness under load of product, detection after test firing
It the results are shown in Table 6.
The composition of raw materials that 5 embodiment 1-7 of table is used
6 embodiment 1-7 testing result of table
Claims (4)
1. the manufacture craft of a kind of ultralow-porosity, low thermal expansion fireclay refractory, mixed using traditional semidry method raw material
Technique mixing is expected, using conventional molding process molding making at semi-finished product green body, it is characterised in that: semi-finished product green body had been burnt into
Cheng Zhong is all made of reducing atmosphere, heat preservation knot in 1200 DEG C or more of heatings and the insulating process risen to after being burnt into maximum temperature
Shu Hou switchs to regular oxidation atmosphere；
Wherein, the control of reducing atmosphere CO concentration is in 10000ppm or more.
2. the manufacture craft of ultralow-porosity according to claim 1, low thermal expansion fireclay refractory, feature exist
In: production 5% or less the porosity, bulk density 2.50g/cm3Above, 0.2MPa loading softening starting point 1600 DEG C or more,
When the extremely low porosity low thermal expansion clay brick of 1000 DEG C of coefficient of thermal expansions 0.46%, firing maximum temperature is 1550-1600 DEG C, is protected
The warm time is 6-48h.
3. the manufacture craft of ultralow-porosity according to claim 1, low thermal expansion fireclay refractory, feature exist
In: production 10% or less the porosity, bulk density 2.45g/cm3Above, 0.2MPa loading softening starting point is at 1500 DEG C or more
When ultralow-porosity clay brick, firing maximum temperature is 1500-1550 DEG C, soaking time 6-48h.
4. the manufacture craft of ultralow-porosity according to claim 1, low thermal expansion fireclay refractory, feature exist
In: production 12% or less the porosity, bulk density 2.40g/cm3Above, 0.2MPa loading softening starting point is at 1500 DEG C or more
When advanced low-porosity clay brick, firing maximum temperature is 1450-1500 DEG C, soaking time 6-48h.
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| CN113800928B (en) * | 2021-10-12 | 2022-08-02 | 宜兴市丁山耐火器材有限公司 | Low-porosity high-strength clay refractory material and preparation method thereof |
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| CN104072160A (en) * | 2014-05-14 | 2014-10-01 | 山东嘉腾实业有限公司 | Ultralow-pore mullite brick |
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