CN113336558A - Magnesia-carbon brick with strong thermal shock resistance and preparation method thereof - Google Patents
Magnesia-carbon brick with strong thermal shock resistance and preparation method thereof Download PDFInfo
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- CN113336558A CN113336558A CN202110519124.0A CN202110519124A CN113336558A CN 113336558 A CN113336558 A CN 113336558A CN 202110519124 A CN202110519124 A CN 202110519124A CN 113336558 A CN113336558 A CN 113336558A
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- carbon brick
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 72
- 239000011449 brick Substances 0.000 title claims abstract description 56
- 230000035939 shock Effects 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 114
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 72
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 57
- 239000000463 material Substances 0.000 claims abstract description 35
- 239000011230 binding agent Substances 0.000 claims abstract description 19
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 13
- 239000000835 fiber Substances 0.000 claims abstract description 12
- 239000005011 phenolic resin Substances 0.000 claims abstract description 12
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 12
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000007767 bonding agent Substances 0.000 claims abstract description 7
- 239000004615 ingredient Substances 0.000 claims abstract description 4
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 18
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 239000000919 ceramic Substances 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 11
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 claims description 9
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 8
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 8
- 239000012634 fragment Substances 0.000 claims description 5
- 239000006229 carbon black Substances 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 239000011863 silicon-based powder Substances 0.000 claims description 4
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical group [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims description 3
- 239000013078 crystal Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000005057 refrigeration Methods 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 3
- 229920005989 resin Polymers 0.000 abstract description 7
- 239000011347 resin Substances 0.000 abstract description 7
- 230000005489 elastic deformation Effects 0.000 abstract description 5
- 230000008646 thermal stress Effects 0.000 abstract description 5
- 239000002657 fibrous material Substances 0.000 abstract description 3
- 239000011148 porous material Substances 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 229910001374 Invar Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000002671 adjuvant Substances 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- -1 corrosion resistance Chemical compound 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000035882 stress 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
- 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
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3244—Zirconium oxides, zirconates, hafnium oxides, hafnates, 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
- C04B2235/40—Metallic constituents or additives not added as binding phase
- C04B2235/404—Refractory metals
-
- 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
- C04B2235/40—Metallic constituents or additives not added as binding phase
- C04B2235/405—Iron group metals
-
- 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
- C04B2235/422—Carbon
- C04B2235/424—Carbon black
-
- 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
- C04B2235/422—Carbon
- C04B2235/425—Graphite
-
- 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
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/52—Constituents or additives characterised by their shapes
- C04B2235/5208—Fibers
- C04B2235/5216—Inorganic
-
- 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
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
Abstract
The invention discloses a magnesia carbon brick with strong thermal shock resistance and a preparation method thereof, relating to the technical field of magnesia carbon bricks, wherein the ingredients comprise fused magnesia, a carbon source, an auxiliary material, an auxiliary agent and a bonding agent, wherein the fused magnesia comprises the following components in percentage by content: carbon source: material assisting: auxiliary agents: the binder is 3:3:1:0.1: 2.9. The magnesia carbon brick with strong thermal shock resistance and the preparation method thereof have the advantages that a certain number of microcracks and pores are formed in the material by increasing the appropriate porosity in the material, introducing or generating a phase with a small linear expansion coefficient, introducing or generating a phase, adding and uniformly dispersing fibers or fibrous materials and the like, so that the thermal shock resistance of the material is improved, meanwhile, a phenolic resin binding agent is selected to replace a carbon-containing resin binding agent, so that the elastic modulus can be effectively reduced, the smaller the elastic modulus is, the larger the elasticity is, the larger the elastic deformation of the material is, the thermal stress can be relieved and released, and the thermal shock resistance of the magnesia carbon brick can be obviously ensured.
Description
Technical Field
The invention relates to the technical field of magnesia carbon bricks, in particular to a magnesia carbon brick with strong thermal shock resistance and stability and a preparation method thereof.
Background
The magnesia carbon brick is mainly used for the inner lining of a converter, an alternating current electric arc furnace and a direct current electric arc furnace, a slag line of a ladle and other parts, and is a non-burning carbon composite refractory material which is formed by taking a high-melting point basic oxide magnesia (melting point 2800 ℃) and a high-melting point carbon material which is difficult to be infiltrated by slag as raw materials, adding various non-oxide additives and combining the raw materials by a carbonaceous bonding agent.
As a composite refractory material, the magnesia carbon brick has good high temperature resistance, strong slag resistance, good thermal shock resistance and low high-temperature creep.
The existing magnesia carbon brick is compared and analyzed by using the elastic modulus, under the same stress, if the strain of the carbon-containing resin brick is 25 percent of that of the phenolic resin brick, the modulus of the carbon-containing resin brick is 4 times that of the phenolic resin brick, the larger the elastic modulus is, the smaller the elasticity is, the smaller the elastic deformation of the material is, the thermal stress cannot be relieved and released, and the thermal shock resistance is unfavorable, so that the thermal shock resistance of the carbon-containing resin magnesia carbon brick is poor.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a magnesia carbon brick with strong thermal shock resistance and a preparation method thereof, and solves the problems in the background art.
In order to achieve the purpose, the invention is realized by the following technical scheme: the magnesia-carbon brick with strong thermal shock resistance comprises the following ingredients of fused magnesia, a carbon source, an auxiliary material, an auxiliary agent and a bonding agent, wherein the fused magnesia comprises the following components in percentage by content: carbon source: material assisting: auxiliary agents: the binder is 3:3:1:0.1: 2.9.
Optionally, the carbon source specifically comprises flaky graphite, carbon black and ceramic powder, and the ratio of 1: 1:1, and mixing the components.
Optionally, the ceramic powder is prepared by adding the ceramic fragments into a sand mill, sanding the ceramic fragments to a powder state, and sieving the powder through a 100-mesh sieve.
Optionally, the auxiliary material is prepared by mixing a component A, a component B and a component C, wherein the component A comprises the following components in percentage by content: and B component: and the component C is 3:1: 1.
Optionally, the component A consists of Fe-36% Ni, tetragonal ZrO2 and steel fibers, and the content ratio of Fe-36% Ni, tetragonal ZrO2 and steel fibers is 0.2: 0.15: 0.5.
optionally, the component B is specifically sodium bicarbonate, and the crystal particle size of the sodium bicarbonate is selected to be 0.5 mm.
Optionally, the component C is specifically steel particles, and the particle size of the steel particles is selected to be 0.3 mm.
Optionally, the adjuvant is specifically Al + Si powder.
Optionally, the binder is a phenolic resin binder.
Based on the raw materials, the invention also discloses a preparation method of the magnesia carbon brick with strong thermal shock resistance stability.
Optionally, the preparation method specifically comprises the following steps:
uniformly stirring fused magnesia and a carbon source to be completely mixed at the normal temperature of 23-25 ℃;
adding phenolic resin binder and continuously stirring;
thirdly, after stirring uniformly, adding the component A in the auxiliary material, and after stirring and mixing uniformly, adding the component C in the auxiliary material;
adding the component B in the auxiliary materials during stirring, keeping the temperature of the mixture below 30 ℃, rapidly performing physical refrigeration on the mixture if the temperature of the mixture exceeds the temperature, and performing subsequent production after the temperature is reduced;
adding auxiliary agent;
sixthly, after stirring and mixing, putting the mixture into a furnace through an upper die, and sintering the bricks.
The invention provides a magnesia carbon brick with strong thermal shock resistance and stability and a preparation method thereof, and the magnesia carbon brick has the following beneficial effects: the magnesia carbon brick with strong thermal shock resistance and the preparation method thereof have the advantages that a certain number of microcracks and pores are formed in the material by increasing proper porosity (sodium bicarbonate which can be decomposed by heating) in the material, introducing or generating a phase (Fe-36% Ni) with small linear expansion coefficient, introducing or generating a certain phase (tetragonal ZrO2), adding and uniformly dispersing fibers or fibrous materials (steel fibers) and the like, so that the thermal shock resistance of the material is improved, meanwhile, a phenolic resin binding agent is selected to replace a carbon-containing resin binding agent, so that the elastic modulus can be effectively reduced, the smaller the elastic modulus is, the larger the elasticity is, the larger the elastic deformation is, the thermal stress can be relieved and released, and the thermal shock resistance stability of the magnesia carbon brick can be obviously ensured.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
Example 1
The magnesia-carbon brick with strong thermal shock resistance comprises the following ingredients of fused magnesia, a carbon source, an auxiliary material, an auxiliary agent and a bonding agent, wherein the fused magnesia comprises the following components in percentage by content: carbon source: material assisting: auxiliary agents: binder 3:3:1:0.1: 2.9;
the carbon source specifically comprises flaky graphite, carbon black and ceramic powder, and the weight ratio of the flaky graphite to the carbon black is 1: 1:1, wherein the ceramic powder is prepared by adding ceramic fragments into a sand mill, sanding the ceramic fragments into a powder state, and sieving the powder with a 100-mesh sieve;
the addition of the ceramic powder enables the magnesia carbon brick to have the advantages of carbon and ceramic, namely corrosion resistance, wear resistance, heat conduction and the like, and also has the advantages of high strength, high hardness and high-temperature oxidation resistance of the ceramic material, so that the product quality of the magnesia carbon brick is greatly improved;
the auxiliary material is prepared by mixing a component A, a component B and a component C, wherein the component A comprises the following components in percentage by weight: and B component: the component C is 3:1:1, specifically, the component A consists of Fe-36% of Ni, tetragonal ZrO2 and steel fibers, and the content ratio of Fe-36% of Ni, tetragonal ZrO2 and the steel fibers is 0.2: 0.15: 0.5, wherein the component B is sodium bicarbonate, the crystal particle size of the sodium bicarbonate is 0.5mm, the component C is steel particles, and the particle size of the steel particles is 0.3 mm;
the auxiliary material is mainly used for improving the thermal shock resistance of the magnesia carbon brick, wherein Fe-36% Ni in the component A is the most common invar type alloy with a small thermal expansion coefficient, the addition of Fe-36% Ni can cause the thermal expansion mismatching in the material, so that microcracks are generated in the firing process of the magnesia carbon brick, the expansion of thermal shock cracks is blocked, and the thermal shock resistance of the magnesia carbon brick can be improved, and the tetragonal ZrO2 can lead the magnesia carbon brick to generate phase change at the tips of the cracks to form an energy absorption mechanism, a non-catastrophic damage system is generated in the magnesia carbon brick, and complicated non-linear fracture behaviors are generated, so that the thermal shock resistance of the magnesia carbon brick is improved, and finally, the addition of steel fibers can increase the energy required by the fracture of the magnesia carbon brick and present remarkable non-linear characteristics, so that the toughness of the material is improved;
the sodium bicarbonate has the advantages that the sodium bicarbonate is easily decomposed by heating, is quickly decomposed at the temperature of more than 50 ℃, and completely loses carbon dioxide at the temperature of 270 ℃, so that in the firing process of the magnesia carbon brick, the sodium bicarbonate is influenced by high temperature and can be sequentially decomposed and exhausted, and finally partial air holes can be formed in the magnesia carbon brick body;
the addition of the steel particles ensures that the magnesia carbon brick has proper porosity and good structural strength;
the auxiliary agent is specifically Al + Si powder, and the Al + Si powder is an antioxidant required by the preparation of the magnesia carbon brick;
the phenolic resin binding agent is selected as the binding agent, and the carbon-containing resin binding agent is replaced by the phenolic resin binding agent, so that the elastic modulus can be effectively reduced, the smaller the elastic modulus is, the larger the elasticity is, the larger the elastic deformation of the material is, the thermal stress can be relieved and released, and the thermal shock resistance of the magnesia carbon brick can be obviously ensured.
Example 2
A preparation method of a magnesia carbon brick with strong thermal shock resistance stability comprises the following specific steps:
uniformly stirring fused magnesia and a carbon source to be completely mixed at the normal temperature of 23-25 ℃;
adding phenolic resin binder and continuously stirring;
thirdly, after stirring uniformly, adding the component A in the auxiliary material, and after stirring and mixing uniformly, adding the component C in the auxiliary material;
adding the component B in the auxiliary materials during stirring, keeping the temperature of the mixture below 30 ℃, rapidly performing physical refrigeration on the mixture if the temperature of the mixture exceeds the temperature, and performing subsequent production after the temperature is reduced;
adding auxiliary agent;
sixthly, after stirring and mixing, putting the mixture into a furnace through an upper die, and sintering the bricks.
In conclusion, the magnesia carbon brick with strong thermal shock resistance and the preparation method thereof have the advantages that a certain amount of microcracks and pores exist in the material by increasing proper porosity (adding sodium bicarbonate which can be decomposed by heating), introducing or generating a phase (Fe-36% Ni) with small linear expansion coefficient, introducing or generating a certain phase (tetragonal ZrO2), adding and uniformly dispersing fibers or fibrous materials (steel fibers) and the like, so that the thermal shock resistance of the material is improved, meanwhile, a phenolic resin bonding agent is selected to replace a carbon-containing resin bonding agent, so that the elastic modulus can be effectively reduced, the smaller the elastic modulus is, the larger the elasticity is, the larger the elastic deformation of the material is, the thermal stress can be relieved and released, and the thermal shock resistance of the magnesia carbon brick can be obviously ensured.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A magnesia carbon brick with strong thermal shock resistance stability is characterized in that: the magnesia carbon brick comprises the following ingredients of fused magnesia, a carbon source, an auxiliary material, an auxiliary agent and a bonding agent, wherein the fused magnesia comprises the following components in percentage by content: carbon source: material assisting: auxiliary agents: the binder is 3:3:1:0.1: 2.9.
2. The magnesia carbon brick with strong thermal shock resistance according to claim 1, characterized in that: the carbon source specifically comprises flaky graphite, carbon black and ceramic powder, and the ratio of 1: 1:1, and mixing the components.
3. The magnesia carbon brick with strong thermal shock resistance according to claim 2, characterized in that: the ceramic powder is prepared by adding ceramic fragments into a sand mill, sanding to a powder state, and sieving the powder with a 100-mesh sieve.
4. The magnesia carbon brick with strong thermal shock resistance according to claim 1, characterized in that: the auxiliary material is prepared by mixing a component A, a component B and a component C, wherein the component A comprises the following components in percentage by content: and B component: and the component C is 3:1: 1.
5. The magnesia carbon brick with strong thermal shock resistance according to claim 4, characterized in that: the component A consists of Fe-36% Ni, tetragonal ZrO2 and steel fibers, and the content ratio of Fe-36% Ni, tetragonal ZrO2 and steel fibers is 0.2: 0.15: 0.5.
6. the magnesia carbon brick with strong thermal shock resistance according to claim 4, characterized in that: the component B is sodium bicarbonate, and the crystal particle size of the sodium bicarbonate is 0.5 mm.
7. The magnesia carbon brick with strong thermal shock resistance according to claim 4, characterized in that: the component C is specifically steel particles, and the particle size of the steel particles is 0.3 mm.
8. The magnesia carbon brick with strong thermal shock resistance according to claim 1, characterized in that: the auxiliary agent is specifically Al + Si powder.
9. The magnesia carbon brick with strong thermal shock resistance according to claim 1, characterized in that: the binding agent is a phenolic resin binding agent.
10. A preparation method of a magnesia carbon brick with strong thermal shock resistance stability is characterized by comprising the following steps: the preparation method comprises the magnesia carbon brick with strong thermal shock resistance stability as defined in any one of claims 1 to 9, and the preparation method comprises the following specific steps:
uniformly stirring fused magnesia and a carbon source to be completely mixed at the normal temperature of 23-25 ℃;
adding phenolic resin binder and continuously stirring;
thirdly, after stirring uniformly, adding the component A in the auxiliary material, and after stirring and mixing uniformly, adding the component C in the auxiliary material;
adding the component B in the auxiliary materials during stirring, keeping the temperature of the mixture below 30 ℃, rapidly performing physical refrigeration on the mixture if the temperature of the mixture exceeds the temperature, and performing subsequent production after the temperature is reduced;
adding auxiliary agent;
sixthly, after stirring and mixing, putting the mixture into a furnace through an upper die, and sintering the bricks.
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| CN202110519124.0A CN113336558A (en) | 2021-05-12 | 2021-05-12 | Magnesia-carbon brick with strong thermal shock resistance and preparation method thereof |
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| CN202110519124.0A CN113336558A (en) | 2021-05-12 | 2021-05-12 | Magnesia-carbon brick with strong thermal shock resistance and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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