CN111763075A - Magnesia carbon brick and preparation method thereof - Google Patents

Magnesia carbon brick and preparation method thereof Download PDF

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Publication number
CN111763075A
CN111763075A CN202010565496.2A CN202010565496A CN111763075A CN 111763075 A CN111763075 A CN 111763075A CN 202010565496 A CN202010565496 A CN 202010565496A CN 111763075 A CN111763075 A CN 111763075A
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parts
mesh
magnesia
powder
carbon
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尹斌
张义先
王新杰
王振宇
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Haicheng Lier Maige Xita Material Co ltd
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Haicheng Lier Maige Xita Material Co ltd
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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
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
    • C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
    • C04B35/043—Refractories from grain sized mixtures
    • 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
    • C04B2235/38—Non-oxide ceramic constituents or additives
    • C04B2235/3852—Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride
    • C04B2235/3856—Carbonitrides, e.g. titanium carbonitride, zirconium carbonitride
    • 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
    • C04B2235/402—Aluminium
    • 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
    • C04B2235/524—Non-oxidic, e.g. borides, carbides, silicides or nitrides
    • C04B2235/5248—Carbon, e.g. 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
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/74—Physical characteristics
    • C04B2235/77—Density
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

The invention relates to a magnesia carbon brick, which comprises the following raw materials of 40-50 parts of 3-5mm fused magnesia, 25-35 parts of 1-3mm fused magnesia, 5-15 parts of 0-1mm fused magnesia, 15-25 parts of 200-mesh fused magnesia, 0.5-5 parts of 500-mesh carbon fiber powder, 0.5-5 parts of 800-mesh carbon fiber powder, 1-5 parts of 200-mesh graphite, 1-5 parts of 200-mesh carbon black, 1-5 parts of 200-mesh titanium carbonitride powder, 1-10 parts of 200-mesh metal aluminum powder, 0.1-1 part of glycerol and 1-10 parts of phenolic resin. Titanium carbonitride has the advantages of TiC and TiN, has high melting point, high hardness, wear resistance, oxidation resistance and good thermal conductivity, and improves the performance of the magnesia carbon brick. During the baking process of the magnesia carbon brick after being built, MgO reacts with water to form Mg (OH) in the presence of glycerol2In the process, part of the magnesium hydroxide crystal whiskers are formed, the effect of binding nails is achieved, and the problem that a hot structure is peeled off is solved.

Description

Magnesia carbon brick and preparation method thereof
Technical Field
The invention relates to a refractory material, in particular to a magnesia carbon brick and a preparation method thereof.
Background
Along with the requirements of smelting low-carbon steel and ultra-low-carbon steel, the ladle lining refractory material is required to meet the requirement of long service life and cannot generate recarburization influence on molten steel. In recent years, low-carbon magnesia carbon bricks have high thermal strength, excellent molten steel and slag corrosion resistance and excellent permeability, and are widely used for smelting lining materials of steel ladles such as ultra-low carbon steel, stainless steel, high-grade automobile plate steel, silicon steel and the like. Compared with the traditional magnesia carbon brick, the low-carbon magnesia carbon brick is easy to oxidize and peel off in the baking and using processes, the granularity of the carbon source added into the general low-carbon magnesia carbon brick is micro-nano, and the oxidation resistance is relatively poor; the carbon content in the low-carbon magnesia carbon brick is low, and the oxidation of a small amount of carbon source in the material can seriously damage the structure of the low-carbon magnesia carbon brick. Meanwhile, the low-carbon magnesia carbon brick is easy to have the problem of hot-state structure stripping in the use process, namely the low-carbon magnesia carbon brick is easy to have hot-state stripping in the use process due to large elastic modulus, high thermal expansion coefficient and large brittleness of materials.
Disclosure of Invention
The invention aims to solve the technical problem of providing the magnesia carbon brick, which reduces the elastic modulus of the magnesia carbon brick, reduces the thermal expansion coefficient, improves the toughness of the material and has certain thermal shock resistance.
In order to achieve the purpose, the invention adopts the following technical scheme:
a magnesia carbon brick comprises, by weight, 40-50 parts of 3-5mm fused magnesia, 25-35 parts of 1-3mm fused magnesia, 5-15 parts of 0-1mm fused magnesia, 15-25 parts of 200-mesh fused magnesia, 0.5-5 parts of 500-mesh carbon fiber powder, 0.5-5 parts of 800-mesh carbon fiber powder, 1-5 parts of 200-mesh graphite, 1-5 parts of 200-mesh carbon black, 1-5 parts of 200-mesh titanium carbonitride powder, 1-10 parts of 200-mesh metal aluminum powder, 0.1-1 part of glycerol and 1-10 parts of phenolic resin.
A preparation method of a magnesia carbon brick comprises the following specific steps:
1) crushing and screening raw materials:
crushing the fused magnesia into small particles with the particle size of 0-5 mm; selecting part of small particles, and finely grinding the small particles into micro powder with the particle size of 200 meshes; sieving raw materials with particle size of 200 mesh, 0-1mm, 1-3mm and 3-5 mm;
2) material proportioning and stirring:
putting the fused magnesia with each grain diameter into a mixer according to the proportion, and slowly adding the phenolic resin at one time within 2-3 minutes; then adding graphite, carbon black and carbon fiber, mixing for 1-2 minutes, finally adding metal aluminum powder, titanium carbonitride powder and glycerol, mixing for 20-30 minutes, and discharging;
3) pressing and forming;
4) and (3) heat treatment:
placing the formed brick on a kiln car, and carrying out heat treatment in a drying kiln at the temperature of 200-;
5) and (6) checking and accepting and packaging.
Compared with the prior art, the invention has the beneficial effects that:
1. the carbon fiber has the excellent characteristics of high tensile strength, good toughness and the like, and has the reinforcing and toughening effects of pulling out, crack deflection, bridging, fracture and the like in the material fracture process, so that the normal-temperature and medium-temperature strength of the low-carbon magnesia carbon brick can be obviously improved, and the normal-temperature elastic modulus can be reduced; on the other hand, the carbon fiber also has the excellent characteristics of good heat conductivity, low thermal expansion coefficient and the like, and is favorable for reducing the high-temperature linear expansion rate of the material and improving the thermal shock performance.
2. Titanium carbonitride is a zero-dimensional ternary solid solution, and TiC and TiN form the basis of titanium carbonitride and both have a NaCl-type structure of face-centered cubic lattice. Titanium carbonitride has the advantages of TiC and TiN, has high melting point, high hardness, wear resistance, oxidation resistance and good thermal conductivity, and improves the performance of the magnesia carbon brick.
3. In the baking furnace process after the magnesia carbon brick is built, in the environment of glycerol, part of magnesium hydroxide whiskers are formed in the process of forming Mg (OH)2 by reacting MgO with water, the effect of binding nails is achieved, and the problem of peeling of a thermal structure caused by oxidation of the magnesia carbon brick is avoided.
Detailed Description
The invention is further illustrated by the following examples:
the following examples describe the invention in detail. These examples are merely illustrative of the best embodiments of the present invention and do not limit the scope of the invention.
1) Crushing and screening raw materials:
crushing the fused magnesia into small particles with the particle size of 015 mm; selecting part of small particles, and finely grinding the small particles into micro powder with the particle size of 200 meshes; sieving raw materials with particle size of 200 mesh, 0-1mm, 1-3mm and 3-5 mm;
2) preparing materials:
table 1: raw material ratio (parts by weight)
Figure BDA0002547686510000021
Figure BDA0002547686510000031
3) Stirring:
putting the fused magnesia with each grain diameter into a mixer according to the proportion, and slowly adding the phenolic resin at one time within 2-3 minutes; then adding graphite, carbon black and carbon fiber, mixing for 1-2 minutes, finally adding metal aluminum powder, titanium carbonitride powder and glycerol, mixing for 20-30 minutes, and discharging;
4) molding:
and after discharging, pressing and forming.
5) And (3) heat treatment:
placing the formed brick on a kiln car, and carrying out heat treatment in a drying kiln at 200-260 ℃;
6) and (6) checking and accepting and packaging.
The technical indexes of the finished magnesia carbon brick are shown in a table 2:
table 2: product detection index
Figure BDA0002547686510000032

Claims (2)

1. A magnesia carbon brick is characterized in that raw materials comprise 40-50 parts of 3-5mm fused magnesia, 25-35 parts of 1-3mm fused magnesia, 5-15 parts of 0-1mm fused magnesia, 15-25 parts of 200-mesh fused magnesia, 0.5-5 parts of 500-mesh carbon fiber powder, 0.5-5 parts of 800-mesh carbon fiber powder, 1-5 parts of 200-mesh graphite, 1-5 parts of 200-mesh carbon black, 1-5 parts of 200-mesh titanium carbonitride powder, 1-10 parts of 200-mesh metal aluminum powder, 0.1-1 part of glycerol and 1-10 parts of phenolic resin.
2. The preparation method of the magnesia carbon brick according to claim 1, characterized by comprising the following steps:
1) crushing and screening raw materials:
crushing the fused magnesia into small particles with the particle size of 0-5 mm; selecting part of small particles, and finely grinding the small particles into micro powder with the particle size of 200 meshes; sieving raw materials with particle size of 200 mesh, 0-1mm, 1-3mm and 3-5 mm;
2) material proportioning and stirring:
putting the fused magnesia with each grain diameter into a mixer according to the proportion, and slowly adding the phenolic resin at one time within 2-3 minutes; then adding graphite, carbon black and carbon fiber, mixing for 1-2 minutes, finally adding metal aluminum powder, titanium carbonitride powder and glycerol, mixing for 20-30 minutes, and discharging;
3) pressing and forming;
4) and (3) heat treatment:
placing the formed brick on a kiln car, and carrying out heat treatment in a drying kiln at the temperature of 200-;
5) and (6) checking and accepting and packaging.
CN202010565496.2A 2020-06-19 2020-06-19 Magnesia carbon brick and preparation method thereof Withdrawn CN111763075A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113248233A (en) * 2021-04-29 2021-08-13 海城利尔麦格西塔材料有限公司 Preparation method of magnesia carbon brick

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113248233A (en) * 2021-04-29 2021-08-13 海城利尔麦格西塔材料有限公司 Preparation method of magnesia carbon brick

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Application publication date: 20201013