CN115368157A - Air brick seat brick and preparation method thereof - Google Patents
Air brick seat brick and preparation method thereof Download PDFInfo
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- CN115368157A CN115368157A CN202110557224.2A CN202110557224A CN115368157A CN 115368157 A CN115368157 A CN 115368157A CN 202110557224 A CN202110557224 A CN 202110557224A CN 115368157 A CN115368157 A CN 115368157A
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- Prior art keywords
- air brick
- corundum
- brick cup
- spinel
- air
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- 239000011449 brick Substances 0.000 title claims abstract description 125
- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 58
- 229910052596 spinel Inorganic materials 0.000 claims abstract description 46
- 239000011029 spinel Substances 0.000 claims abstract description 46
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 29
- 239000002994 raw material Substances 0.000 claims abstract description 20
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 15
- 239000010703 silicon Substances 0.000 claims abstract description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 7
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 6
- 238000003723 Smelting Methods 0.000 claims abstract description 5
- 238000005266 casting Methods 0.000 claims description 34
- 239000000463 material Substances 0.000 claims description 33
- 229910052593 corundum Inorganic materials 0.000 claims description 20
- 239000010431 corundum Substances 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 11
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 10
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 239000004568 cement Substances 0.000 claims description 4
- 229910052681 coesite Inorganic materials 0.000 claims description 2
- 229910052906 cristobalite Inorganic materials 0.000 claims description 2
- 235000012239 silicon dioxide Nutrition 0.000 claims description 2
- 229910052682 stishovite Inorganic materials 0.000 claims description 2
- 229910052905 tridymite Inorganic materials 0.000 claims description 2
- 230000035939 shock Effects 0.000 abstract description 18
- 238000005336 cracking Methods 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 9
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 9
- 230000003628 erosive effect Effects 0.000 description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 8
- 238000001816 cooling Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000008646 thermal stress Effects 0.000 description 5
- 229910052786 argon Inorganic materials 0.000 description 4
- 239000007791 liquid phase Substances 0.000 description 4
- 239000001095 magnesium carbonate Substances 0.000 description 4
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 4
- 235000014380 magnesium carbonate Nutrition 0.000 description 4
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008439 repair process Effects 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- NACUKFIFISCLOQ-UHFFFAOYSA-N [Mg].[Cr] Chemical compound [Mg].[Cr] NACUKFIFISCLOQ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Classifications
-
- 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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/58—Pouring-nozzles with gas injecting means
-
- 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
- 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
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
-
- 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
- C04B2235/02—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
- C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
-
- 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
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/428—Silicon
-
- 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
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/602—Making the green bodies or pre-forms by moulding
-
- 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
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/606—Drying
Abstract
The invention discloses an air brick cup and a preparation method thereof, and the air brick cup comprises the following raw materials in percentage by weight: electric smelting of magnesia: 0.5-2%, silicon micropowder: 0.2 to 0.6%, CA2:8.0 to 30 percent, and the balance being corundum-spinel castable. The brick cup of the air brick disclosed by the invention has good thermal shock resistance by adding the fused magnesia, the silica powder and the CA2, and the cracking and falling phenomena of the brick cup in the using process are reduced, so that the service lives of the air-permeable core and the air brick are prolonged.
Description
Technical Field
The invention relates to the field of steelmaking, in particular to a gas brick seat brick and a preparation method thereof, which are mainly installed at the bottom of a ladle.
Background
The ladle bottom argon blowing process is the earliest and most commonly used external refining technology, argon is blown in through a gas permeable brick arranged at the bottom of a ladle to stir molten steel, metallurgical physical and chemical reaction is accelerated, inclusion floating is promoted, the cleanliness of the molten steel is improved, and meanwhile, the components and the temperature of the molten steel are uniform.
The ladle air brick is an important functional element for blowing argon at the bottom of the ladle, plays an important role in external refining, the normal turnover of the ladle is directly influenced by the height of the service life of the air brick, and the quality of the metallurgical effect directly influences the quality of molten steel and the stable and smooth production; therefore, the high efficiency and long service life of the air brick have important significance for stabilizing the production rhythm, improving the product quality and reducing the production cost.
The air permeable brick consists of an air permeable core and a seat brick, argon enters the steel ladle through the air permeable core, and the seat brick plays a role in protecting the air permeable core; the damage of the brick cup can directly affect the service life of the air-permeable core, so the function of the brick cup is very important; wherein the brick cup mainly undergoes the following actions in the use process:
1) The working surface of the brick cup is repeatedly subjected to rapid cooling and rapid heating, so that the brick cup is easy to break and peel;
2) Is eroded and permeated by molten steel and slag;
3) Is strongly washed and abraded by high-temperature molten steel;
therefore, the brick cup is required to have high strength, good thermal shock resistance and excellent slag corrosion resistance in actual production.
In the prior art, the steel ladle air brick seat brick is made of casting materials, which generally adopt corundum-spinel, chromium corundum and magnesium chromium, and the corundum-spinel casting materials have good erosion resistance, so the corundum-spinel is widely used for steel ladle working linings, air brick seat bricks, RH dip pipe casting materials and the like, but the corundum-spinel has large expansion at high temperature, and is subjected to the thermal stress generated by the repeated change of the steel ladle temperature, thermal shock and the like in the use process, and the phenomena of cracks, transverse fracture and chipping are often generated, so that the seat brick is cracked and peeled off, and the service life of an air core and the air brick is directly influenced. Domestic related researches on the air brick seat brick mainly focus on the structure, and the researches related to the material formula are less.
In view of this, it is urgently needed to develop a novel air brick cup, which has good thermal shock resistance and reduces cracking and peeling of the cup in the using process, thereby prolonging the service life of the air permeable core and the air brick.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an air brick cup and a preparation method thereof, wherein corundum-spinel castable is adopted, and fused magnesia, silica powder and CA2 are added, so that the air brick cup has good thermal shock resistance, the cracking and stripping phenomena in the use process are reduced, and the service life of an air core and the air brick is prolonged.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides an air brick cup which comprises the following raw materials in percentage by weight: electric smelting of magnesia: 0.5-2%, silicon micropowder: 0.2 to 0.6%, CA2:8.0 to 30 percent, and the balance being corundum-spinel castable.
Preferably, the MgO content in the fused magnesia is more than 95wt%; and/or
The grain diameter of the fused magnesia is 0.044-0.1 mm.
Preferably, the SiO2 content in the silicon micropowder is more than 94wt%.
Preferably, the melting point of CA2 is 1765 +/-25 ℃, and the thermal expansion coefficient at 200 ℃ is 1.4 multiplied by 10 -6 4.4X 10 thermal expansion coefficient at 1400 deg.C -6 /° c; and/or
The particle size of the CA2 is 0.1-1 mm.
Preferably, the corundum-spinel castable comprises corundum, spinel, alumina micro powder and pure calcium aluminate cement.
Preferably, the corundum accounts for 35-65% of the mass of the raw materials; and/or
The spinel accounts for 15-25% of the mass of the raw material.
Preferably, the corundum is tabular corundum or white corundum, and the spinel is sintered magnesia alumina spinel or fused magnesia alumina spinel.
Preferably, the grain diameter of the corundum is 0.1-8 mm; and/or
The particle size of the spinel is 0.1-1 mm.
Preferably, the air brick cup is prepared by proportioning the raw materials, adding water, uniformly mixing to form a casting material, pouring the casting material into a cup brick mould, carrying out vibration casting, curing in the mould for 2-5 days, curing for not less than 7 days after demoulding, and then baking at 350-400 ℃.
The air brick cup brick of the invention adopts the following measures to improve the thermal shock resistance of the corundum-spinel castable according to the inherent material characteristics of the corundum-spinel castable:
firstly, microcracks are generated in the castable at high temperature, and microcrack toughening is achieved: 0.5-2% of fused magnesia with the thickness of 0.044-0.1 mm and Al in the corundum-spinel castable material at high temperature are added 2 O 3 The fine powder can react with MgO to form in-situ spinel to expand to generate microcracks, the content of fused magnesite is less than 0.5%, the function of forming the microcracks at high temperature is not obvious and exceeds 2%, and the volume stability of the castable is influenced because the fine powder is greatly expanded due to the formation of more in-situ spinel;
secondly, the casting material generates a small amount of liquid phase at high temperature to relieve thermal stress: adding 0.2-0.6% of silicon micropowder, generating a small amount of liquid phase at high temperature, and absorbing thermal stress to relieve the thermal stress so as to improve thermal shock resistance; the content of the silicon micropowder is less than 0.2%, the liquid phase formed at high temperature is less, the effect of relieving the thermal stress is not obvious and exceeds 0.6%, and the corrosion resistance of the castable is influenced because more liquid phases are formed at high temperature;
thirdly, adding a low-expansion material to reduce the expansion of the casting material and improve the thermal shock resistance: the addition of 0.1-1 mm of 8-30% of low expansion material CA2 (a compound of calcium aluminate series) can reduce the expansion coefficient of the castable, improve the volume stability and improve the thermal shock resistance; the content of CA2 is less than 8 percent, the effect of reducing the expansion of the casting material is not obvious and is higher than 30 percent, and the strength is influenced because the water adding amount of the casting material is increased.
The invention also provides a preparation method for preparing the air brick cup, the air brick cup is prepared by proportioning the raw materials, adding water, uniformly mixing to form a casting material, pouring the casting material into a cup mould, carrying out vibration casting, carrying out in-mould curing for 2-5 days, carrying out in-mould curing for not less than 7 days after demoulding, and then baking at 350-400 ℃.
The invention has the following beneficial effects:
the air brick cup disclosed by the invention adopts the corundum-spinel castable, and the fused magnesia, the silica powder and the CA2 are added, so that the air brick cup has good thermal shock resistance, the cracking and stripping phenomena in the use process are reduced, and the service lives of the air core and the air brick are prolonged; in the steel-making process, after the brick cup of the air brick is used in a minor repair period of a steel ladle, the brick cup of the air brick still has good thermal shock resistance, less cracking and stripping, and the corrosion resistance is equivalent to that of the brick cup in the prior art.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way.
The invention provides an air brick cup, which comprises the following raw materials in percentage by weight: electric smelting of magnesia: 0.5-2%, silicon micropowder: 0.2-0.6%, CA2:8.0 to 30 percent, and the balance being corundum-spinel castable.
The main raw material of the air brick cup brick adopts corundum-spinel castable, wherein the corundum-spinel castable is prepared by adopting corundum (0.1-8 mm), spinel (0.1-1 mm), alumina micropowder and pure calcium aluminate cement; the corundum accounts for 35-65% of the mass of the raw material, and the spinel accounts for 15-25% of the mass of the raw material; wherein the corundum is tabular corundum or white corundum, and the spinel is sintered magnesia-alumina spinel or fused magnesia-alumina spinel.
The fused magnesite adopts fused magnesite with MgO content more than 95wt%, for example, the fused magnesite with MgO content of 97% or 98%; wherein the grain diameter of the fused magnesia is 0.044-0.1 mm;
the silicon micropowder adopts SiO 2 Silicon micropowder with the content of more than 94wt percent.
CA2 is a compound of the calcium aluminate series: calcium dialuminate (CaO 2 Al) 2 O 3 ) In the present invention, the thermal expansion coefficient is 1.4 × 10 with a melting point of 1765 + -25 ℃ and a temperature of 200 DEG C -6 The coefficient of thermal expansion at 1400 ℃ is 4.4X 10 -6 CA2 at/DEG C can reduce the expansion coefficient of the corundum-spinel castable, improve the volume stability and improve the thermal shock resistance. Wherein the particle size of CA2 is0.1～1mm。
After being weighed according to the formula, a brick cup die is installed, then water is added for uniform mixing to form a casting material with good fluidity, then the casting material is poured into the brick cup die for vibration casting, the in-die curing is carried out for 2-5 days, the out-die curing is carried out for not less than 7 days after the demoulding, and then the air brick cup is baked at the baking temperature of 350-400 ℃ to obtain the air brick cup brick of the invention.
When the air brick cup is subjected to a thermal shock test, the test condition is 1100 ℃→ water cooling, wherein the water cooling frequency is more than 40 times when the sample cracks and peels off; in the actual use process, after a minor repair period of the ladle, the air brick seat brick only has small cracks and has no stripping phenomenon.
The air brick holder block of the present invention will be further described with reference to specific examples; in the following embodiments, the corundum-spinel castable comprises corundum, spinel, alumina micropowder and pure calcium aluminate cement, wherein the grain size of the corundum is 0.1-8 mm, and the grain size of the spinel is 0.1-1 mm; electric smelting of magnesia: the grain diameter is 0.044-0.1 mm, and the MgO content is 97% or 98%; silicon micropowder: siO2 2 The content is more than 94wt%; and (3) CA2: the grain diameter is 0.1-1 mm, the melting point is 1765 +/-25 ℃, and the thermal expansion coefficient at 200 ℃ is 1.4 multiplied by 10 -6 The thermal expansion coefficient at 1400 ℃ is 4.4X 10 -6 /℃。
Example 1
The air brick seat brick in the embodiment comprises the following raw materials in percentage by weight:
0.5 percent of fused magnesia;
0.2 percent of silicon micropowder;
CA2 30％；
corundum-spinel castable:
after being weighed according to the formula, a brick cup die is installed, then water is added for uniform mixing to form a casting material with good fluidity, then the casting material is poured into the brick cup die for vibration casting, the in-die curing is carried out for 2-5 days, the out-die curing is carried out for not less than 7 days after the demoulding, and then the air brick cup is baked at the baking temperature of 350-400 ℃ to obtain the air brick cup.
Example 2
The air brick seat brick in the embodiment comprises the following raw materials in percentage by weight:
1.0% of fused magnesia;
0.3 percent of silicon micropowder;
CA2 20％；
corundum-spinel castable:
after being weighed according to the formula, the brick cup die is installed, then water is added for uniform mixing to form a pouring material with good fluidity, then the pouring material is poured into the brick cup die for vibration pouring, the in-die curing is carried out for 2-5 days, the out-die curing is carried out for not less than 7 days after the demoulding, and then the baking is carried out at the baking temperature of 350-400 ℃ to obtain the air brick cup.
Example 3
The air brick seat brick in the embodiment comprises the following raw materials in percentage by weight:
1.5 percent of fused magnesia;
0.5 percent of silicon micropowder;
CA2 15％；
corundum-spinel castable:
after being weighed according to the formula, a brick cup die is installed, then water is added for uniform mixing to form a casting material with good fluidity, then the casting material is poured into the brick cup die for vibration casting, the in-die curing is carried out for 2-5 days, the out-die curing is carried out for not less than 7 days after the demoulding, and then the air brick cup is baked at the baking temperature of 350-400 ℃ to obtain the air brick cup.
Example 4
The air brick setting brick in the embodiment comprises the following raw materials in percentage by weight:
2.0 percent of fused magnesia;
0.6 percent of silicon micropowder;
CA2 8％；
corundum-spinel castable:
after being weighed according to the formula, a brick cup die is installed, then water is added for uniform mixing to form a casting material with good fluidity, then the casting material is poured into the brick cup die for vibration casting, the in-die curing is carried out for 2-5 days, the out-die curing is carried out for not less than 7 days after the demoulding, and then the air brick cup is baked at the baking temperature of 350-400 ℃ to obtain the air brick cup.
Comparative example
The prior corundum-spinel castable is adopted in the comparative example, and the components of the raw materials of the castable are as follows in percentage by weight:
after being weighed according to the formula, a brick cup die is installed, then water is added for uniform mixing to form a casting material with good fluidity, then the casting material is poured into the brick cup die for vibration casting, the in-die curing is carried out for 2-5 days, the out-die curing is carried out for not less than 7 days after the demoulding, and then the air brick cup is baked at the baking temperature of 350-400 ℃ to obtain the air brick cup.
Performance testing
The air brick and the brick cup prepared in the examples 1 to 4 and the comparative example are respectively subjected to thermal shock resistance, erosion resistance and use effect detection, and the detection method comprises the following steps:
thermal shock resistance test method: according to the national standard, standard bricks are adopted, water cooling is carried out at 1100 ℃ → the water cooling frequency when cracking and stripping of the sample occur is recorded, and the specific result is shown in table 1;
erosion resistance test method: a crucible slag resistance test is adopted, slag is put into a crucible, the crucible is split after treatment at 1600 ℃ for 3h, the erosion area is measured, the erosion resistance index is recorded, and the specific result is shown in table 1; wherein the smaller the number of the erosion resistance index, the better the erosion resistance.
The using effect detection method comprises the following steps: after a minor repair period of the ladle, the air brick cup bricks prepared in examples 1 to 4 and the comparative example were subjected to recording of the cracking and peeling conditions of the air brick cup bricks, and the specific results are shown in table 1;
table 1 air brick seat brick performance test results
With reference to examples 1-4, comparative examples and table 1, the thermal shock resistance of the brick cup of the invention is significantly higher than that of the comparative examples, and the erosion resistance index of the brick cup of the invention is very close to that of the comparative examples and is basically equivalent to that of the comparative examples; after the brick cup is used in a minor repair period of a ladle, the brick cup of the invention has good thermal shock resistance and less cracking and stripping phenomena, while the brick cup of the air brick in the comparative example has good erosion resistance but more cracking and stripping phenomena.
Therefore, the air brick cup adopts the corundum-spinel castable, and the electric melting magnesia, the silicon micropowder and the CA2 are added, so that the air brick cup has good thermal shock resistance, the cracking and stripping phenomena in the use process are reduced, and the service lives of the air core and the air brick are prolonged.
Although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The air brick cup is characterized in that the raw materials comprise the following components in percentage by weight: electric smelting of magnesia: 0.5-2%, silicon micropowder: 0.2 to 0.6%, CA2:8.0 to 30 percent, and the balance being corundum-spinel castable.
2. The air brick cup brick of claim 1 wherein the fused magnesia has an MgO content of greater than 95wt%; and/or
The grain diameter of the fused magnesia is 0.044-0.1 mm.
3. The air brick cup as claimed in claim 1, wherein the fine silica powder has a SiO2 content of more than 94wt%.
4. The air brick cup according to claim 1 wherein CA2 has a melting point of 1765 ± 25 ℃ and a coefficient of thermal expansion of 1.4 x 10 at 200 ℃ -6 Per DEG C, a coefficient of thermal expansion at 1400 ℃ of 4.4X 10 -6 /° c; and/or
The particle size of the CA2 is 0.1-1 mm.
5. The air brick cup according to any one of claims 1 to 4 wherein the corundum-spinel castable material comprises corundum, spinel, alumina micropowder and pure calcium aluminate cement.
6. The air brick cup brick of claim 5, wherein the corundum accounts for 35-65% of the mass of the raw materials; and/or
The spinel accounts for 15-25% of the mass of the raw material.
7. The air brick setting brick as claimed in claim 6, wherein the corundum is tabular corundum or white corundum, and the spinel is sintered magnesia alumina spinel or fused magnesia alumina spinel.
8. The air brick cup according to claim 7, wherein the corundum has a particle size of 0.1-8 mm; and/or
The particle size of the spinel is 0.1-1 mm.
9. The air brick cup according to any one of claims 1 to 4, wherein the air brick cup is prepared by mixing the raw materials, adding water, mixing uniformly to form a casting material, pouring the casting material into a cup mold, performing vibration casting, performing in-mold curing for 2 to 5 days, performing curing for not less than 7 days after demolding, and then baking at 350 to 400 ℃.
10. The preparation method for preparing the air brick cup as claimed in claim 5, wherein the air brick cup is prepared by proportioning the raw materials, adding water, uniformly mixing to form a casting material, pouring the casting material into a cup mould, carrying out vibration casting, carrying out in-mould curing for 2-5 days, carrying out demoulding, then carrying out curing for not less than 7 days, and then baking at 350-400 ℃.
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| CN202110557224.2A CN115368157A (en) | 2021-05-21 | 2021-05-21 | Air brick seat brick and preparation method thereof |
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