CN115340362A - Alumina fiber reinforced magnesia carbon sliding plate and preparation process thereof - Google Patents
Alumina fiber reinforced magnesia carbon sliding plate and preparation process thereof Download PDFInfo
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- CN115340362A CN115340362A CN202211043809.3A CN202211043809A CN115340362A CN 115340362 A CN115340362 A CN 115340362A CN 202211043809 A CN202211043809 A CN 202211043809A CN 115340362 A CN115340362 A CN 115340362A
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- fused magnesia
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- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 96
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 48
- 239000000835 fiber Substances 0.000 title claims abstract description 47
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 36
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 239000000843 powder Substances 0.000 claims description 32
- 239000000203 mixture Substances 0.000 claims description 27
- 239000002245 particle Substances 0.000 claims description 23
- 238000002156 mixing Methods 0.000 claims description 22
- 229910052580 B4C Inorganic materials 0.000 claims description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 14
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims description 14
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 14
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 11
- 239000011230 binding agent Substances 0.000 claims description 8
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 6
- 230000032683 aging Effects 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 239000007767 bonding agent Substances 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- 238000007580 dry-mixing Methods 0.000 claims description 6
- 239000005011 phenolic resin Substances 0.000 claims description 6
- 229920001568 phenolic resin Polymers 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- RWDBMHZWXLUGIB-UHFFFAOYSA-N [C].[Mg] Chemical compound [C].[Mg] RWDBMHZWXLUGIB-UHFFFAOYSA-N 0.000 claims description 5
- 239000006229 carbon black Substances 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000005245 sintering Methods 0.000 claims description 2
- 239000011159 matrix material Substances 0.000 abstract description 15
- 239000000463 material Substances 0.000 abstract description 11
- 230000035939 shock Effects 0.000 abstract description 11
- 239000002131 composite material Substances 0.000 abstract description 5
- 229910052596 spinel Inorganic materials 0.000 abstract description 5
- 239000011029 spinel Substances 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000011065 in-situ storage Methods 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 description 20
- 239000010959 steel Substances 0.000 description 20
- 238000009472 formulation Methods 0.000 description 9
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 8
- 229910052791 calcium Inorganic materials 0.000 description 8
- 239000011575 calcium Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 238000005266 casting Methods 0.000 description 5
- 238000010304 firing Methods 0.000 description 4
- 238000009749 continuous casting Methods 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000011224 oxide ceramic Substances 0.000 description 2
- 229910052574 oxide ceramic Inorganic materials 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 238000009991 scouring Methods 0.000 description 2
- PUAQLLVFLMYYJJ-UHFFFAOYSA-N 2-aminopropiophenone Chemical compound CC(N)C(=O)C1=CC=CC=C1 PUAQLLVFLMYYJJ-UHFFFAOYSA-N 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009827 uniform distribution 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
- C04B35/01—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
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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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/71—Ceramic products containing macroscopic reinforcing agents
- C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
- C04B35/80—Fibres, filaments, whiskers, platelets, or the like
-
- 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
- C04B2235/3817—Carbides
- C04B2235/3821—Boron carbides
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- 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
- C04B2235/3817—Carbides
- C04B2235/3826—Silicon carbides
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- 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
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- 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
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- 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
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- 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
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Abstract
The invention relates to an alumina fiber reinforced magnesia carbon sliding plate and a preparation process thereof, wherein alumina fibers are added and uniformly dispersed in a matrix to form an organic composite whole, so that the load borne by a matrix material is reduced, and the free energy of crack propagation is consumed; meanwhile, the spinel phase is generated by the in-situ reaction of the spinel phase and MgO in the matrix through high-temperature treatment, the mechanical property of the material is improved, and the thermal shock stability of the material is improved.
Description
Technical Field
The invention relates to an alumina fiber reinforced magnesia-carbon sliding plate and a preparation process thereof, belonging to the field of inorganic non-metallic material subject refractory materials.
Background
The sliding nozzle is a molten steel control device in the continuous casting process, can accurately adjust the flow of the molten steel from a ladle to a tundish, ensures the quality of a cast steel billet, and is an indispensable functional element in the continuous casting. The sliding plate brick needs to have good thermal shock resistance stability and high-temperature mechanical property due to the long-time bearing of thermal shock and mechanical scouring of molten steel and the frequent actions of rapid cooling and rapid heating.
In recent years, the smelting proportion of calcium-treated steel is increased year by year, and the traditional Al 2 O 3 -ZrO 2 -C and Al 2 O 3 the-C sliding plate is not resistant to corrosion and scouring when the calcium-treated steel is cast, and is easy to generate special horseshoe-shaped corrosion damage, so that the service life is influenced. Although the traditional MgO-C sliding plate does not react with CaO and FeO to generate eutectic compounds, the MgO-C sliding plate is suitable for casting steel grades such as calcium-treated steel, high-oxygen steel and the like, but has poor thermal shock stability, easy stripping, low strength and short service life.
The oxide fiber/oxide ceramic matrix composite can work for a long time in a high-temperature oxidation environment, and cannot form catastrophic fracture due to oxidation. The oxide ceramic fiber which is most widely researched and applied is alumina-based fiber, the alumina fiber has the characteristics of high modulus and strength, good thermal shock stability, chemical stability and the like, and can be effectively bonded with a matrix material to form a composite material with excellent performance, so that the mechanical property of the material is improved, and the thermal shock stability of the material is improved.
The aluminum oxide fiber reinforced magnesium-carbon sliding plate is researched and developed, the aluminum oxide fiber is added into the sliding plate, the thermal shock stability of the sliding plate is improved, and the high-temperature mechanical property of the material is improved, so that the use requirement of calcium-treated steel continuous casting production is met.
Disclosure of Invention
The invention relates to an alumina fiber reinforced magnesia carbon sliding plate and a preparation process thereof, wherein alumina fibers are added and uniformly dispersed in a matrix to form an organic composite whole, so that the load borne by the matrix material is reduced, the expansion free energy of cracks is consumed, and simultaneously, the alumina fiber reinforced magnesia carbon sliding plate and MgO in the matrix react in situ at high temperature to generate a spinel phase to form a high-strength net structure, so that the mechanical property of the material is improved, and the thermal shock stability of the material is improved.
The formula (weight and particle size content) of the invention is as follows:
(1) 7 to 15 percent of fused magnesia with the granularity of 5 to 3mm
(2) 15 to 25 percent of fused magnesia with the granularity of 3 to 1mm
(3) 10 to 20 percent of fused magnesia with the granularity of 1 to 0mm
(4) 5 to 15 percent of silicon carbide with the granularity of 1 to 0mm
(5) 25 to 35 percent of fused magnesia with the granularity of 0.045mm
(6) 3 to 6 percent of metal aluminum powder with the particle size of 0.045mm
(7) 2 to 4 percent of boron carbide with the particle size of 0.045mm
(8) 2 to 10 percent of alumina fiber
(9) 3 to 5 percent of carbon source powder
(10) 3 to 6 percent of binding agent, and is added in addition, the total mass percent of the raw materials is not counted
MgO of the fused magnesia is more than or equal to 97.5 percent;
the SiC is more than or equal to 97 percent;
the metallic aluminum Al is more than or equal to 95 percent;
the boron carbide B 4 C≥88%；
The alumina fiber is discontinuous fiber, wherein Al is 2 O 3 The diameter is more than or equal to 85 percent and is 10 to 15 mu m;
the carbon source powder is prepared by mixing crystalline flake graphite and carbon black according to the proportion of 1;
the binding agent is prepared by mixing phenolic resin and organic silicon modified resin according to the ratio of 4 to 1.
The specific process comprises the following steps:
(1) Strongly premixing the fused magnesia fine powder with the granularity of 0.045mm, the metal aluminum, the boron carbide and the carbon source powder for 15-20 minutes;
(2) Adding fused magnesia and silicon carbide particles of 5-3 mm, 3-1 mm and 1-0 mm into a mixer with a rod-shaped stirring blade according to a proportion, carrying out dry mixing for 2 minutes, adding alumina fiber, stirring and dispersing for 5-10 minutes, adding all bonding agents, mixing for 3-5 minutes, adding all premixed fine powder and micro powder, mixing for 15-20 minutes, and homogenizing through strong mixing to obtain a mixture, wherein the effective time is 30-35 minutes;
(3) Discharging the mixture to remove agglomerated large blocks, and ageing the mixture for 20 to 30 hours under the conditions of constant temperature and constant humidity;
(4) Pressing and forming;
(5) Naturally drying for 20-30 hours, and then drying for 30-48 hours at 220-280 ℃;
(6) Sintering at 1550-1650 deg.C for 12-18 h.
The magnesium-carbon sliding plate produced by the invention has excellent mechanical property and thermal shock stability, and compared with the prior art, the magnesium-carbon sliding plate has the remarkable difference that:
(1) A mixer with rod-shaped stirring blades is adopted, the contact area of the mixer and fibers is small, the fibers are prevented from being damaged, the alumina fibers are uniformly dispersed, a reaction interface of the alumina fibers and a base material is designed, and the thermal shock stability of the material is improved. The alumina fiber which is uniformly dispersed and MgO in the matrix are subjected to high-temperature heat treatment to generate in-situ reaction, and a spinel phase is generated at an interface, so that the alumina fiber and the matrix material are combined into ceramic, and the combination is tighter. Meanwhile, the magnesia-alumina spinel has good erosion resistance, abrasion resistance and good thermal shock stability.
(2) Alumina fiber toughening mechanism. The alumina fiber has high strength (1.4 to 2.45GPa), high modulus (190 to 385GPa), low thermal expansion coefficient and uniform distribution in the matrix material to form an organic composite whole, when an external load acts on the matrix material, the matrix material can transfer a part of the load to the alumina fiber, so that the load of the matrix material is reduced, when the stress borne by the fiber is greater than the self-strength, the fiber is broken and pulled out, so that the diffusion energy of cracks is consumed, and the toughness and the plasticity are provided for the matrix material.
(3) The alumina fiber can effectively consume the free energy of crack diffusion, and improve the toughness and mechanical property of the material. The fibers have larger surface area than the particles, and when the cracks are expanded to the fibers, the cracks need to deflect longer paths, so that more crack expansion free energy is consumed; meanwhile, the crack deflects, and the crack propagation path is zigzag, so that the surface energy of the crack is increased, the reinforcing effect is achieved, and the strength of the material is improved.
Detailed Description
Example 1
The following formulations (weight and particle size content) were used:
(1) 7 percent of fused magnesia with the granularity of 5-3 mm
(2) 25 percent of fused magnesia with the granularity of 3-1 mm
(3) 15 percent of fused magnesia with the granularity of 1-0 mm
(4) 10 percent of silicon carbide with the granularity of 1-0 mm
(5) 30 percent of fused magnesia with the granularity of 0.045mm
(6) 4 percent of metal aluminum powder with the particle size of 0.045mm
(7) Boron carbide with particle size of 0.045mm 4%
(8) 2 percent of alumina fiber
(9) Carbon source powder 3%
(10) 3.8% of a binding agent, 3% of phenolic resin and 3% of organic silicon resin, excluding the total mass percentage of the raw materials
The preparation process comprises the following parts:
(1) Strongly premixing the fused magnesia fine powder with the granularity of 0.045mm, the metallic aluminum, the boron carbide and the carbon source powder for 15 minutes;
(2) Adding fused magnesia and silicon carbide particles of 5-3 mm, 3-1 mm and 1-0 mm into a mixer with a rod-shaped stirring blade according to a proportion, carrying out dry mixing for 2 minutes, adding alumina fiber, stirring and dispersing for 5 minutes, adding all bonding agents, mixing for 3 minutes, adding all premixed fine powder and micro powder, mixing for 20 minutes, and homogenizing to obtain a mixture through strong mixing, wherein the effective time is 30 minutes;
(3) Discharging the mixture to remove agglomerated large blocks, and ageing the mixture for 24 hours under the conditions of constant temperature and constant humidity;
(4) Pressing and forming;
(5) Naturally drying for 30 hours, and then drying for 48 hours at 220 ℃;
(6) Firing at 1550 ℃ for 18 hours.
Table 1 shows the specifications and formulation of the raw materials and their properties of example 1, which, when tested, had a bulk density of 3.12g/cm 3 The apparent porosity is 7.6%, the normal temperature compressive strength reaches 156MPa, the high temperature rupture strength (1400 ℃ multiplied by 0.5 h) is 26MPa, the sliding plate has micro cracks, no through cracks and no peeling phenomenon after being used for trial in 120-ton ladle casting calcium treatment steel in a steel mill, the average service life is 4 times, and the use requirements of the existing products are met.
Example 2
The following formulations (weight and particle size content) were used:
(1) 15 percent of fused magnesia with the granularity of 5-3 mm
(2) 20 percent of fused magnesia with the granularity of 3-1 mm
(3) 10 percent of fused magnesia with the granularity of 1-0 mm
(4) 5 percent of silicon carbide with the granularity of 1-0 mm
(5) 28 percent of fused magnesia with the granularity of 0.045mm
(6) 6 percent of metal aluminum powder with the particle size of 0.045mm
(7) Boron carbide 2% with particle size of 0.045mm
(8) 10 percent of alumina fiber
(9) Carbon source powder 4%
(10) 5.5% of a binding agent, 4% of phenolic resin and 1% of organic silicon resin, and the total mass percentage of the raw materials is not counted
The process comprises the following parts:
(1) Strongly premixing the fused magnesia fine powder with the granularity of 0.045mm, the metal aluminum, the boron carbide and the carbon source powder for 17 minutes;
(2) Adding fused magnesia and silicon carbide particles of 5-3 mm, 3-1 mm and 1-0 mm into a mixer with a rod-shaped stirring blade according to a proportion, carrying out dry mixing for 2 minutes, adding alumina fiber, stirring and dispersing for 10 minutes, adding all bonding agents, mixing for 5 minutes, adding all premixed fine powder and micro powder, mixing for 18 minutes, and homogenizing to obtain a mixture through strong mixing, wherein the effective time is 35 minutes;
(3) Discharging the mixture to remove agglomerated large blocks, and ageing the mixture for 30 hours under the conditions of constant temperature and constant humidity;
(4) Pressing and forming;
(5) Naturally drying for 24 hours, and then drying for 30 hours at 280 ℃;
(6) Firing at 1650 ℃ for 12 hours.
Table 1 shows the specifications and formulation of the raw materials and their properties of example 2, which, when tested, had a bulk density of 3.21g/cm 3 The apparent porosity is 6.6%, the normal temperature compressive strength reaches 161MPa, the high temperature rupture strength (1400 ℃ multiplied by 0.5 h) is 28MPa, the average service life is 4.1 times, the hole expansion is uniform, and the phenomena of steel clamping, galling and the like do not exist when the method is used for casting calcium-treated steel in 100 tons of steel ladles in a steel mill.
Example 3
The following formulations (weight and particle size content) were used:
(1) 10 percent of fused magnesia with the granularity of 5-3 mm
(2) 15 percent of fused magnesia with the granularity of 3-1 mm
(3) 20 percent of fused magnesia with the granularity of 1-0 mm
(4) 8 percent of silicon carbide with the granularity of 1-0 mm
(5) 32 percent of fused magnesia with the granularity of 0.045mm
(6) 3 percent of metal aluminum powder with the particle size of 0.045mm
(7) Boron carbide with the particle size of 0.045mm 3%
(8) 4 percent of alumina fiber
(9) Carbon source powder 5%
(10) 4.8% of a binding agent, 1% of phenolic resin and organic silicon resin, excluding the total mass percentage of the raw materials
The process comprises the following steps:
(1) Strongly premixing the fused magnesia fine powder with the granularity of 0.045mm, the metal aluminum, the boron carbide and the carbon source powder for 18 minutes;
(2) Adding fused magnesia and silicon carbide particles with the particle sizes of 5-3 mm, 3-1 mm and 1-0 mm into a mixer with a rod-shaped stirring blade according to a certain proportion, carrying out dry mixing for 2 minutes, adding alumina fiber, stirring and dispersing for 7 minutes, adding all bonding agents, mixing for 3 minutes, adding all premixed fine powder and micro powder, mixing for 20 minutes, and homogenizing into a mixture through strong mixing, wherein the effective time is 32 minutes;
(3) Discharging the mixture to remove agglomerated large blocks, and ageing the mixture for 26 hours under the conditions of constant temperature and constant humidity;
(4) Pressing and forming;
(5) Naturally drying for 26 hours, and then drying for 36 hours at 260 ℃;
(6) Firing at 1600 ℃ for 16 hours.
Table 1 shows the specifications and formulation of the raw materials and their properties of example 3, which was tested to have a bulk density of 3.15g/cm 3 The apparent porosity is 6.4%, the normal temperature compressive strength reaches 158MPa, the high temperature rupture strength (1400 ℃ multiplied by 0.5 h) is 20MPa, the average service life is 4.1 times when the high temperature rupture strength is tried out in 80 ton ladle casting calcium treatment steel in a steel mill, and the used plate surface is flat without steel clamping, through cracks, peeling and the like.
Example 4
The following formulations (weight and particle size content) were used:
(1) 8 percent of fused magnesia with the granularity of 5-3 mm
(2) 16 percent of fused magnesia with the granularity of 3-1 mm
(3) 12 percent of fused magnesia with the granularity of 1-0 mm
(4) 15 percent of silicon carbide with the granularity of 1-0 mm
(5) 35 percent of fused magnesia with the granularity of 0.045mm
(6) 3 percent of metal aluminum powder with the particle size of 0.045mm
(7) Boron carbide with particle size of 0.045mm 3%
(8) 5 percent of alumina fiber
(9) Carbon source powder 3%
(10) 6% of binding agent, 2% of phenolic resin and organic silicon resin, excluding raw materials in percentage by mass
The process comprises the following parts:
(1) Strongly premixing the fused magnesia fine powder with the granularity of 0.045mm, the metal aluminum, the boron carbide and the carbon source powder for 16 minutes;
(2) Adding fused magnesia and silicon carbide particles of 5-3 mm, 3-1 mm and 1-0 mm into a mixer with a rod-shaped stirring blade according to a proportion, carrying out dry mixing for 2 minutes, adding alumina fiber, stirring and dispersing for 8 minutes, adding all bonding agents, mixing for 4 minutes, adding all premixed fine powder and micro powder, mixing for 17 minutes, and homogenizing to obtain a mixture through strong mixing, wherein the effective time is 31 minutes;
(3) Discharging the mixture to remove agglomerated large blocks, and ageing the mixture for 28 hours under the conditions of constant temperature and constant humidity;
(4) Pressing and forming;
(5) Naturally drying for 28 hours, and then drying for 40 hours at the temperature of 240 ℃;
(6) Firing at 1620 ℃ for 15 hours.
Table 1 shows the specifications and formulation of the raw materials and their properties of example 4, which, when tested, had a bulk density of 3.14g/cm 3 The apparent porosity is 6.5%, the normal temperature compressive strength reaches 153MPa, the high temperature rupture strength (1400 ℃ multiplied by 0.5 h) is 24MPa, the average service life is 4.5 times when the high temperature rupture strength is tried out in 80-ton ladle casting calcium treatment steel in a steel mill, the used plate surface is flat, the hole expansion is uniform, and the phenomena of block falling, peeling, galling and the like are avoided.
The specifications, formulations and test performances of the raw materials of the sliding plate prepared by the above embodiment are as follows in table 1:
Claims (3)
1. an alumina fiber reinforced magnesium-carbon sliding plate comprises the following components in percentage by weight:
(1) 7-15% of fused magnesia with the granularity of 5-3 mm;
(2) 15 to 25 percent of fused magnesia with the granularity of 3 to 1 mm;
(3) 10-20% of fused magnesia with the granularity of 1-0 mm;
(4) 5 to 15 percent of silicon carbide with the granularity of 1 to 0 mm;
(5) 25-35% of fused magnesia with the granularity of 0.045 mm;
(6) 3 to 6 percent of metal aluminum powder with the granularity of 0.045 mm;
(7) 2 to 4 percent of boron carbide with the granularity of 0.045 mm;
(8) 2 to 10 percent of alumina fiber;
(9) 3-5% of carbon source powder;
(10) 3-6% of binding agent, and the total mass percentage of the raw materials is not added.
2. The alumina fiber reinforced magnesium carbon skateboard of claim 1, wherein: mgO of the fused magnesia is more than or equal to 97.5 percent; the SiC is more than or equal to 97 percent; the metal aluminum Al is more than or equal to 95 percent; the boron carbide B 4 C is more than or equal to 88 percent; the alumina fiber is discontinuous fiber, wherein Al is 2 O 3 More than or equal to 85 percent, and the diameter is 10 to 15 mu m; the carbon source powder is prepared by mixing crystalline flake graphite and carbon black according to the proportion of 1; the binding agent is prepared by mixing phenolic resin and organic silicon modified resin according to the ratio of 4 to 1.
3. A process for preparing the alumina fiber reinforced magnesia carbon slide board according to any one of claims 1 to 2, comprising the steps of:
(1) Strongly premixing the fused magnesia fine powder with the granularity of 0.045mm, the metal aluminum, the boron carbide and the carbon source powder for 15-20 minutes;
(2) Adding fused magnesia and silicon carbide particles of 5-3 mm, 3-1 mm and 1-0 mm into a mixer with a rod-shaped stirring blade according to a proportion, carrying out dry mixing for 2 minutes, adding alumina fiber, stirring and dispersing for 5-10 minutes, adding all bonding agents, mixing for 3-5 minutes, adding all premixed fine powder and micro powder, mixing for 15-20 minutes, and homogenizing through strong mixing to obtain a mixture, wherein the effective time is 30-35 minutes;
(3) Discharging the mixture to remove agglomerated large blocks, and ageing the mixture for 20-30 hours under the conditions of constant temperature and constant humidity;
(4) Pressing and forming;
(5) Naturally drying for 20-30 hours, and then drying for 30-48 hours at 220-280 ℃;
(6) Sintering at 1550-1650 deg.c for 12-18 hr.
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Application publication date: 20221115 |