CN110483083B - Protective curing coating for surface of fiber furnace lining of cold-rolled continuous annealing furnace - Google Patents

Protective curing coating for surface of fiber furnace lining of cold-rolled continuous annealing furnace Download PDF

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CN110483083B
CN110483083B CN201910881249.0A CN201910881249A CN110483083B CN 110483083 B CN110483083 B CN 110483083B CN 201910881249 A CN201910881249 A CN 201910881249A CN 110483083 B CN110483083 B CN 110483083B
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fiber
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zirconium
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aluminum silicate
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杜贤武
丁翠娇
李源
宋中华
田大鹏
杨超
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Wuhan Iron and Steel Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/66Monolithic refractories or refractory mortars, including those whether or not containing clay
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3205Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
    • C04B2235/3206Magnesium oxides or oxide-forming salts thereof
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    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3217Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30Constituents and secondary phases not being of a fibrous nature
    • C04B2235/34Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3418Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/52Constituents or additives characterised by their shapes
    • C04B2235/5208Fibers
    • C04B2235/5216Inorganic
    • C04B2235/522Oxidic
    • C04B2235/5228Silica and alumina, including aluminosilicates, e.g. mullite

Abstract

A protective curing coating for the surface of a fiber furnace lining of a cold-rolled continuous annealing furnace comprises the following raw materials in percentage by weight: zirconium-containing aluminum silicate powder with the particle size less than or equal to 10 mu m: 30-40%, light floating beads with the particle size of 100-300 μm: 10-20% of active Al with granularity less than or equal to 10 mu m2O3Powder: 2-6%, and fumed silica with particle size less than or equal to 40 nm: 2-6%, zirconium-containing aluminum silicate fiber section: 1-4%, magnesium oxide active powder with the particle size less than or equal to 10 μm: 5-10%, inorganic composite adhesive: 30-40%. The invention can resist high temperature of 1000 ℃, has high surface hardness, large bonding strength with a furnace lining interface, good thermal shock stability and the ability of resisting the erosion of furnace gas at 40-45 m/s, can effectively reduce the flying of fiber stripping objects, ensure the cleanliness in a continuous annealing furnace, and can directly block a local heat bridge existing in the traditional steel plate protection of a fiber furnace lining, thereby reducing the heat dissipation loss of the furnace lining.

Description

Protective curing coating for surface of fiber furnace lining of cold-rolled continuous annealing furnace
Technical Field
The invention relates to a refractory curing coating for an industrial furnace, in particular to a protective curing coating for a high-temperature working surface of a fiber furnace lining of a continuous annealing furnace.
Background
At present, a furnace lining of a cold-rolling continuous annealing furnace generally adopts a ceramic fiber layer blanket and stainless steel protection structure, and refractory fibers are integrated with a protection steel plate and a steel shell through a metal anchoring piece. Although the stainless steel protective lining plate has a good protective effect on a ceramic fiber furnace lining and ensures that the ceramic fiber furnace lining is not damaged, and fiber stripped objects scatter and the environment in the furnace is clean, the stainless steel lining plate generally needs to be processed and manufactured in a factory according to a part design drawing in advance, installation and assembly are carried out on the site according to a certain sequence, and when the surface part of the furnace lining is welded (including the welding of a fixing nut), in order to prevent welding slag pollution caused by electric welding, specific argon arc welding is needed, so that time, labor and material are wasted, and the investment is large at one time. Meanwhile, the stainless steel protection plate and the welding points thereof are easy to deform and crack under the long-term high-temperature (850-950 ℃) state, if a furnace chamber is heated by a resistance band, the grounding phenomenon of the resistance band is easy to generate, so that the whole unit is shut down to process, and higher economic cost is paid. In addition, the stainless steel protective plate is connected with the metal anchoring piece to penetrate through the metal anchoring piece to form a heat bridge, so that the heat dissipation loss of the fiber furnace lining is increased, and the heat preservation and heat insulation capacity of the fiber furnace lining is reduced.
In view of the above problems, those skilled in the art are also continuously researching solutions, such as the following through search:
the document of the chinese patent application No. CN200610025018.2 discloses a method for sewing aluminum cloth for protecting furnace lining of refractory fiber module, wherein the silicon aluminum cloth is sewed on the surface of the furnace lining of the fiber module by a method of folding and lapping a fixing needle, a sewing thread and a sewing needle. Although the problem that the resistance band is grounded to cause unit shutdown due to high-temperature deformation of the stainless steel protection plate is solved, the cleanliness of the furnace can be reduced due to the fact that the silicon-aluminum cloth is easy to shrink, pulverize and fall off under the action of high temperature for a long time, and the surface quality of strip steel is affected.
The document of the chinese patent application No. CN201720053307.7 discloses a composite furnace structure of fiber module and fiber board, wherein both the fiber module and the fiber board are made of polycrystalline alumina or mullite, and are protected by polycrystalline fiber material with better high temperature resistance and difficult pulverization. But because the high-end polycrystalline alumina fiber is too high in investment at present, the price per ton exceeds 60 ten thousand yuan.
From the above analysis, although a great deal of research is conducted at home and abroad on the protection technology of the working hot surface of the fiber furnace lining of the cold-rolled continuous annealing furnace, the defects still exist in the actual production, and the requirement of the cold-rolled continuous annealing furnace lining under the new situation cannot be met, so that the research on the protection technology of the fiber furnace lining of the cold-rolled continuous annealing furnace needs to be further carried out, and a protection method more suitable for the structure of the fiber furnace lining is expected to be found.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the protective curing coating for the surface of the fiber furnace lining of the continuous annealing furnace, which can resist the high temperature of 1000 ℃, has high surface hardness, high bonding strength with the furnace lining interface, good thermal shock stability and the capability of resisting the erosion of furnace gas at 40-45 m/s, can effectively reduce the flying of fiber stripping substances, ensure the cleanliness in a continuous annealing furnace, can directly block a local thermal bridge in the traditional steel plate protection of the fiber furnace lining, and reduce the heat dissipation loss of the furnace lining.
The measures for realizing the aim are as follows:
a protective curing coating for the surface of a fiber furnace lining of a cold-rolled continuous annealing furnace comprises the following raw materials in percentage by weight: zirconium-containing aluminum silicate powder with the particle size less than or equal to 10 mu m: 30-40%, light floating beads with the particle size of 100-300 μm: 10-20% of active Al with granularity less than or equal to 10 mu m2O3Powder: 2-6%, and fumed silica with particle size less than or equal to 40 nm: 2-6%, zirconium-containing aluminum silicate fiber section: 1-4%, magnesium oxide active powder with the particle size less than or equal to 10 μm: 5-10%, inorganic composite adhesive: 30-40%.
It is characterized in that: the inorganic composite adhesive comprises the following raw materials in percentage by weight: sodium tripolyphosphate: 15-25%, silica sol: 75-85%; SiO in silica sol2The weight percentage content is not less than 20 percent.
It is characterized in that: the diameter of the zirconium-containing aluminum silicate fiber is less than or equal to 10 mu m, and the length of the zirconium-containing aluminum silicate fiber is less than or equal to 1 mm.
It is characterized in that: the zirconium-containing aluminum silicate powder is obtained by performing high-energy ball milling and refining treatment on waste and recovered zirconium-containing aluminum silicate refractory fibers.
The function and the limitation reason of each raw material in the invention are as follows:
the invention adopts the zirconium-containing aluminum silicate powder with the granularity less than or equal to 10 mu m, particularly adopts the waste zirconium-containing aluminum silicate fiber as the raw material, because the waste zirconium-containing aluminum silicate fiber not only has cheap and easily obtained raw materials, but also the powder treated by the high-energy ball milling refining process has a ball-like shape, is convenient for spraying construction, can realize waste utilization and comprehensive utilization, and simultaneously, the zirconium-containing aluminum silicate powder is amorphous, has low heat conductivity and good high temperature resistance, and can meet the heat insulation and high temperature resistance of a cured coating; the dosage is limited to 30-40%, because when the dosage is less than 30%, the surface hardness and the airflow scouring resistance of the cured coating are greatly reduced, and when the dosage is more than 40%, the volume density of the coating is higher and is not matched with the volume weight of the fiber, and the separation of two-phase interfaces is easily caused to cause the cracking or the falling of the coating.
The light floating beads with the particle size of 100-300 mu m are adopted, and the light floating beads have good fluidity and are beneficial to spraying construction; the density is low, the heat conductivity coefficient is small, and the volume density, the heat insulation performance and the bonding strength of the cured coating can be effectively adjusted. The amount of the coating is limited to 10-20%, because when the amount of the coating is less than 10%, the coating has low fluidity and is not beneficial to spraying construction, and simultaneously, the reduction effect on the volume density and the heat conductivity coefficient of the coating is not obvious, and when the amount of the coating is more than 20%, the strength of the coating is reduced, and the airflow scouring resistance of the coating is reduced.
The invention adopts active Al with the grain size less than or equal to 10 mu m2O3The powder can improve the bonding strength of the coating at normal temperature due to the coagulation combination of the powder, and is mixed with the gas phase nano SiO with ultrahigh activity in the heating process2The mullite is generated by reaction to form ceramic bond, so that the high-temperature bonding strength of the coating is improved, and the hardness and the washability of the coating are improved. The amount of the coating is limited to 2-6% because the amount is less than 2% which is not beneficial to the improvement of the fluidity and the uniformity of the microstructure of the coating, and when the amount is more than 6%, the water requirement of the coating is increased, the fluidity is reduced, a large amount of air pores are generated, and the mechanical property of the coating is reduced.
The invention adopts the fumed silica with the granularity less than or equal to 40 nm because the fumed silica can reduce the content of Al2O3The ceramic sintering temperature of the coating can be used as a bonding agent to promote the curing effect and improve the bonding strength of the coating, and can also be filled among large, medium and small particles to improve the compactness and the smoothness of the coating. The amount of the fumed silica is limited to 2-6%, because when the amount of the fumed silica is less than 2%, the fumed silica cannot be fully filled into particle gaps and forms a continuous contact phase with the alumina micro powder, on one hand, the fumed silica is not beneficial to improving the compactness of a coating and the medium-temperature bonding strength of the coating, and when the amount of the fumed silica is more than 6%, the fumed silica is easy to agglomerate and is not beneficial to improving the flowability of the coating and the uniformity of a microstructure.
The zirconium-containing aluminum silicate fiber section with the diameter less than or equal to 10 mu m and the length less than or equal to 1mm is adopted, and the zirconium-containing aluminum silicate fiber section can effectively slow down the thermal stress action in the coating and improve the mechanical property and the thermal shock stability of the coating through the strengthening and toughening action of the fiber. The usage amount is limited to 1-4%, because when the usage amount is less than 1%, the toughening effect of the fiber on the coating is not obvious, and when the usage amount is more than 4%, the fluidity of the coating is seriously reduced, which is not beneficial to the spraying construction of the coating.
The magnesium oxide active powder with the particle size less than or equal to 10 mu m is adopted, and the magnesium oxide active powder can be coagulated by self hydration at normal temperature and can also be mixed with high-activity nano SiO2Forming magnesium silicon oxide hydrate with stronger bonding force and sodium magnesium phosphate with high bonding property by reacting with phosphate, accelerating the hardening speed and curing efficiency of the coating and shortening the curing time; at high temperature, with Al2O3The spinel is formed by in-situ reaction, and the slag resistance, permeability resistance and wear resistance of the coating are improved. The amount of the curing agent is limited to 5 to 10% because the curing agent is not suitable for hydration and adhesion when the amount is less than 5%, and the curing agent is too fast to control the curing rate when the amount is more than 10%.
The invention adopts the following components: 15-25%, silica sol: 75-85%; and SiO in silica sol2The inorganic composite adhesive with the weight percentage content of not less than 20 percent is used for binding and curing to form a film. The amount of the binder is limited to 30 to 40% because when the amount is less than 30%, the substrate material cannot be completely bonded to form a film, and the coating is liable to crack or fall off, and when the amount is more than 40%, the water content of the coating is too high, the fluidity is deteriorated, and the initial setting time is shortened.
Compared with the prior art, the invention has the characteristics that:
(1) the invention adopts the waste zirconium-containing aluminum silicate refractory fiber as the main raw material, and the raw material is cheap and easy to obtain and has high purity; the high-energy ball milling process is adopted for refining and then recycling, so that solid waste is recycled, and the method is environment-friendly, energy-saving and environment-friendly; the zirconium-containing aluminum silicate has good high temperature resistance and low heat conductivity coefficient, can be used for a long time in a reducing atmosphere at 1000 ℃, and completely meets the use requirements of high temperature resistance and low heat conductivity of the furnace lining coating of the cold rolling continuous annealing furnace.
(2) The invention adopts the light floating beads, has a typical closed pore structure, has good particle fluidity and is constructed by spraying; the heat conduction coefficient is low, the heat insulation performance is excellent, and the heat dissipation loss and the outer wall temperature of the continuous annealing furnace can be obviously reduced.
(3) The invention adopts the short-cut zirconium-containing aluminum silicate fiber as the coating auxiliary material, utilizes the reinforcing toughness of the fiber to the matrix and the slow release effect of the fiber to the thermal stress, effectively improves the mechanical property and the thermal shock stability of the coating, simultaneously utilizes the good heat insulation capability of the refractory fiber, enhances the heat insulation effect of the coating, overcomes the defect that the zirconium-containing aluminum silicate refractory fiber is pulverized and fails due to high-temperature crystallization when being used alone, and develops the use mode of the zirconium-containing aluminum silicate refractory fiber.
(4) The invention adopts the magnesium oxide fine powder as the curing agent, utilizes the physical and chemical actions among the magnesium oxide, the sodium tripolyphosphate and the silica sol to accelerate the agglomeration and the bonding of the adhesive, can quickly harden the coating, and obviously shortens the curing time of the coating (which can be shortened to 2 hours), thereby shortening the construction period.
(5) Different from the traditional curing coating containing a certain amount of organic adhesive, the invention adopts the inorganic bi-component composite adhesive, does not generate gas in the heating process, is non-toxic and harmless, avoids the problem that the reducing atmosphere of a cold rolling continuous annealing furnace is polluted by the released gas in the heating process of the traditional curing coating, and the composite adhesive has better cohesiveness at low, medium and high temperatures and higher bonding strength along with the increase of the temperature.
Drawings
FIG. 1 is a micrograph of a coating after curing of the coating of the present invention.
Detailed Description
The present invention is described in detail below:
example 1
A protective curing coating for the surface of a fiber furnace lining of a cold-rolled continuous annealing furnace comprises the following raw materials in percentage by weight: the particle size of the waste zirconium-containing aluminum silicate powder is less than or equal to 10 mu m: 30 percent, light floating beads with the granularity of 100-300 mu m: 20 percent of active Al with the grain size less than or equal to 10 mu m2O3Powder: 5 percent, and fumed silica with the particle size less than or equal to 40 nm: 5 percent, zirconium-containing aluminum silicate fiber section with the diameter less than or equal to 10 mu m and the length less than or equal to 1 mm: 2 percent of granularity less than or equal to 10 mum magnesium oxide active powder: 8%, inorganic composite adhesive: 30 percent.
The inorganic composite adhesive comprises the following components in percentage by weight: sodium tripolyphosphate: 15.5% of SiO220% by weight of silica sol: 84.5 percent.
After being coated on the surface of the fiber lining of the cold-rolled continuous annealing furnace of the applicant, the volume density of the coating is 0.84 g/cm3The rupture strength is 2.3 MPa, the thermal conductivity coefficient at 900 ℃ is 0.26 w/m.K, and the airflow scouring resistance speed is 42 m/s.
The use detection is carried out for 12 months, and the detection shows that the phenomenon of furnace gas scouring in the furnace is light and still meets the requirement of a normal range; the thermal shock stability is good, the scattering phenomenon of fiber stripping substances is not found, the cleanliness in the continuous annealing furnace is high, and the problem of local thermal bridge in the traditional steel plate protection of a fiber furnace lining is not caused. The cold rolling continuous annealing furnace can still continue to operate.
Example 2
A protective curing coating for the surface of a fiber furnace lining of a cold-rolled continuous annealing furnace comprises the following raw materials in percentage by weight: the particle size of the waste zirconium-containing aluminum silicate powder is less than or equal to 10 mu m: 30 percent, light floating beads with the granularity of 100-300 mu m: 10 percent of active Al with the grain size less than or equal to 10 mu m2O3Powder: 5 percent, and fumed silica with the particle size less than or equal to 40 nm: 5 percent, zirconium-containing aluminum silicate fiber section with the diameter less than or equal to 10 mu m and the length less than or equal to 1 mm: 2 percent of magnesium oxide active powder with the granularity less than or equal to 10 mu m: 10%, inorganic composite adhesive: 38 percent.
The inorganic composite adhesive comprises the following components in percentage by weight: sodium tripolyphosphate: 15% of SiO221% by weight of silica sol: 85 percent.
After being coated on the surface of the fiber lining of the cold-rolled continuous annealing furnace of the applicant, the volume density of the coating is 0.98 g/cm3The rupture strength is 1.5 MPa, the thermal conductivity coefficient at 900 ℃ is 0.45 w/m.K, and the airflow scouring resistance speed is 40 m/s.
After 12 months of use detection, the phenomenon that the furnace is slightly scoured by furnace gas still meets the requirement of a normal range; the thermal shock stability is good, the scattering phenomenon of fiber stripping substances is not found, the cleanliness in the continuous annealing furnace is high, and the problem of local thermal bridge in the traditional steel plate protection of a fiber furnace lining is not caused. The cold rolling continuous annealing furnace can still continue to operate.
Example 3
A protective curing coating for the surface of a fiber furnace lining of a cold-rolled continuous annealing furnace comprises the following raw materials in percentage by weight: the particle size of the waste zirconium-containing aluminum silicate powder is less than or equal to 10 mu m: 35 percent, light floating beads with the granularity of 100-300 mu m: 15 percent of active Al with the grain size less than or equal to 10 mu m2O3Powder: 4 percent, and fumed silica with the particle size less than or equal to 40 nm: 6 percent of zirconium-containing aluminum silicate fiber section with the diameter less than or equal to 10 mu m and the length less than or equal to 1 mm: 3 percent of magnesium oxide active powder with the granularity less than or equal to 10 mu m: 7%, inorganic composite adhesive: 30 percent.
The inorganic composite adhesive comprises the following components in percentage by weight: sodium tripolyphosphate: 18% of SiO221% by weight of silica sol: 82 percent.
After being coated on the surface of the fiber lining of the cold-rolled continuous annealing furnace of the applicant, the volume density of the coating is 0.93 g/cm3The rupture strength is 2.9 MPa, the thermal conductivity coefficient at 900 ℃ is 0.36 w/m.K, and the airflow scouring resistance speed is 41.5 m/s.
Through 18-month use detection, the phenomenon of furnace gas scouring in the furnace is light and still meets the requirement of a normal range; the thermal shock stability is good, the scattering phenomenon of fiber stripping substances is not found, the cleanliness in the continuous annealing furnace is high, and the problem of local thermal bridge in the traditional steel plate protection of a fiber furnace lining is not caused. The cold rolling continuous annealing furnace can still continue to operate.
Example 4
A protective curing coating for the surface of a fiber furnace lining of a cold-rolled continuous annealing furnace comprises the following raw materials in percentage by weight: the particle size of the waste zirconium-containing aluminum silicate powder is less than or equal to 10 mu m: 32 percent, light floating beads with the granularity of 100-300 mu m: 18 percent of active Al with the grain size less than or equal to 10 mu m2O3Powder: 6 percent, and fumed silica with the particle size less than or equal to 40 nm: 4 percent of zirconium-containing aluminum silicate fiber section with the diameter less than or equal to 10 mu m and the length less than or equal to 1 mm: 1 percent of magnesium oxide active powder with the granularity less than or equal to 10 mu m: 5%, inorganic composite adhesive: 34 percent.
The inorganic composite adhesive comprises the following components in percentage by weightQuantity: sodium tripolyphosphate: 22% of SiO content222% by weight of silica sol: 78 percent.
After being coated on the surface of the fiber lining of the cold-rolled continuous annealing furnace of the applicant, the volume density of the coating is 0.91 g/cm3The rupture strength is 3.8 MPa, the thermal conductivity coefficient at 900 ℃ is 0.34 w/m.K, and the airflow scouring resistance speed is 42 m/s.
Through 18-month use detection, the phenomenon that the furnace is slightly scoured by furnace gas still meets the requirement of a normal range; the thermal shock stability is good, the scattering phenomenon of fiber stripping substances is not found, the cleanliness in the continuous annealing furnace is high, and the problem of local thermal bridge in the traditional steel plate protection of a fiber furnace lining is not caused. The cold rolling continuous annealing furnace can still continue to operate.
Example 5
A protective curing coating for the surface of a fiber furnace lining of a cold-rolled continuous annealing furnace comprises the following raw materials in percentage by weight: the particle size of the waste zirconium-containing aluminum silicate powder is less than or equal to 10 mu m: 38 percent, light floating beads with the granularity of 100-300 mu m: 12 percent of active Al with the grain size less than or equal to 10 mu m2O3Powder: 3 percent, and the gas-phase white carbon black with the granularity less than or equal to 40 nm: 3 percent of zirconium-containing aluminum silicate fiber section with the diameter less than or equal to 10 mu m and the length less than or equal to 1 mm: 4 percent of magnesium oxide active powder with the granularity less than or equal to 10 mu m: 9%, inorganic composite binder: 31 percent.
The inorganic composite adhesive comprises the following components in percentage by weight: sodium tripolyphosphate: 20% of SiO221% by weight of silica sol: 80 percent.
After being coated on the surface of the fiber lining of the cold-rolled continuous annealing furnace of the applicant, the volume density of the coating is 1.25 g/cm3The rupture strength is 1.6 MPa, the thermal conductivity coefficient at 900 ℃ is 0.32 w/m.K, and the airflow scouring resistance speed is 45 m/s.
After 24-month use detection, the phenomenon that the furnace is slightly scoured by furnace gas still meets the requirement of a normal range; the thermal shock stability is good, the scattering phenomenon of fiber stripping substances is not found, the cleanliness in the continuous annealing furnace is high, and the problem of local thermal bridge in the traditional steel plate protection of a fiber furnace lining is not caused. The cold rolling continuous annealing furnace can still continue to operate.
Example 6
A protective curing coating for the surface of a fiber furnace lining of a cold-rolled continuous annealing furnace comprises the following raw materials in percentage by weight: the particle size of the waste zirconium-containing aluminum silicate powder is less than or equal to 10 mu m: 40%, light floating beads with the granularity of 100-300 μm: 10 percent of active Al with the grain size less than or equal to 10 mu m2O3Powder: 2 percent, and fumed silica with the particle size less than or equal to 40 nm: 2 percent of zirconium-containing aluminum silicate fiber section with the diameter less than or equal to 10 mu m and the length less than or equal to 1 mm: 1 percent of magnesium oxide active powder with the granularity less than or equal to 10 mu m: 5%, inorganic composite adhesive: 40 percent.
The inorganic composite adhesive comprises the following components in percentage by weight: sodium tripolyphosphate: 25% of SiO225% by weight of silica sol: 75 percent.
After being coated on the surface of the fiber lining of the cold-rolled continuous annealing furnace of the applicant, the volume density of the coating is 1.2 g/cm3The rupture strength is 2.5 MPa, the thermal conductivity coefficient at 900 ℃ is 0.42 w/m.K, and the airflow scouring resistance speed is 43 m/s.
After 12 months of use detection, the phenomenon that the furnace is slightly scoured by furnace gas still meets the requirement of a normal range; the thermal shock stability is good, the scattering phenomenon of fiber stripping substances is not found, the cleanliness in the continuous annealing furnace is high, and the problem of local thermal bridge in the traditional steel plate protection of a fiber furnace lining is not caused. The cold rolling continuous annealing furnace can still continue to operate.
Description of the drawings:
the zirconium-containing aluminum silicate powder in each embodiment is obtained by performing high-energy ball milling and refining treatment on waste zirconium-containing aluminum silicate refractory fibers;
when the raw materials are used in the above embodiments, the raw materials are added according to the addition requirement and then stirred until the raw materials are uniform.
The specific embodiments are merely preferred examples and are not intended to limit the scope of the invention.

Claims (3)

1. A protective curing coating for the surface of a fiber furnace lining of a cold-rolled continuous annealing furnace comprises the following raw materials in percentage by weight: zirconium-containing aluminum silicate powder with the particle size less than or equal to 10 mu m: 30-40%, light floating beads with the particle size of 100-300 μm: 10-20%, active Al2O3 powder with the granularity less than or equal to 10 μm: 2-6%, and fumed silica with particle size less than or equal to 40 nm: 2-6%, zirconium-containing aluminum silicate fiber section: 1-4%, magnesium oxide active powder with the particle size less than or equal to 10 μm: 5-10%, inorganic composite adhesive: 30-40%;
the inorganic composite adhesive comprises the following raw materials in percentage by weight: sodium tripolyphosphate: 15-25%, silica sol: 75-85%; the SiO2 content of the silica sol is not less than 20 percent by weight.
2. The protective curing coating for the surface of the fiber lining of the cold-rolled continuous annealing furnace according to claim 1, wherein: the diameter of the zirconium-containing aluminum silicate fiber section is less than or equal to 10 mu m, and the length of the zirconium-containing aluminum silicate fiber section is less than or equal to 1 mm.
3. The protective curing coating for the surface of the fiber lining of the cold-rolled continuous annealing furnace according to claim 1, wherein: the zirconium-containing aluminum silicate powder is obtained by performing high-energy ball milling and refining treatment on waste zirconium-containing aluminum silicate refractory fibers.
CN201910881249.0A 2019-09-18 2019-09-18 Protective curing coating for surface of fiber furnace lining of cold-rolled continuous annealing furnace Active CN110483083B (en)

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