Preparation method of metal and non-metal composite material for dry quenching coke tank lining plate

Abstract

The invention relates to the technical field of dry quenching coke pot lining plates, in particular to a preparation method of a metal and nonmetal composite material for a dry quenching coke pot lining plate. The invention provides a metal and nonmetal composite material, which is prepared from the following raw materials in percentage by mass: 20 to 35 percent of heat-resistant steel fiber, 25 to 35 percent of brown fused alumina, 15 to 30 percent of SiC, 4 to 6 percent of alpha-Al2O3 micro powder, 5 to 8 percent of calcium aluminate cement, 3 to 5 percent of silicon micro powder, 0.03 to 0.5 percent of carboxymethyl cellulose and 0.01 to 0.03 percent of polyacrylamide. The metal and nonmetal composite material can prolong the service life of the dry quenching coke pot lining plate and is energy-saving.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dry quenching coke tank lining plate, in particular to a preparation method of metal and non-metal composite material for dry quenching coke tank lining plate. BACKGROUND

[0002] Dry quenching is a method of cooling red coke by using inert gas. In the dry quenching process, red coke is loaded from the top of the dry quenching furnace, low-temperature inert gas is blown into the red coke layer in the dry quenching furnace cooling chamber by a circulating fan, absorbs the heat of red coke, and the cooled coke is discharged from the bottom of the dry quenching furnace. The high-temperature inert gas coming out of the dry quenching furnace annular flue is subjected to heat exchange by the dry quenching boiler, the boiler generates steam, and the cooled inert gas is blown into the dry quenching furnace by the circulating fan for recycling. One of the important bearing and transport tools is the coke tank, which mainly functions to transport red coke (about 1000℃) in the carbonization chamber to the dry quenching furnace. Influenced by environmental protection control, hoist equipment failure, change of coke quantity for ironmaking, and other factors, the production rhythm of the coke oven changes rapidly, and the coke tank encounters the severe challenge of frequent cold and hot alternation. This results in that the service life of the coke tank lining plate cannot reach the expected life, the standby coke tank has not been repaired, the online coke tank lining plate has been damaged and needs to be replaced, and the production of the coke oven is seriously restricted. The current coke tank lining plate material is basically designed as cast iron alloy and refractory castable. The thermal shock resistance (cycle number from 25 to 1100℃ to cracking) of the cast iron alloy is only several to tens of times, the wear resistance (ASTM G65 wear amount, g) is 0.25-0.40, the high-temperature (1100℃) bending strength is 8-20MPa, and the service life is about 6 months. The thermal shock resistance (cycle number from 25 to 1100℃ to cracking) of the refractory castable (Al2O3-SiO2 series refractory castable) is not more than 30 times, the wear resistance (ASTM G65 wear amount, g) is 0.10-0.18, the high-temperature (1100℃) bending strength is 8-15MPa, and the service life is about 8 months. The service life cannot meet the use requirements. SUMMARY

[0003] Therefore, the present application aims to provide a preparation method of metal and non-metal composite material for dry quenching coke tank lining plate. The metal and non-metal composite material can improve the service life of the dry quenching coke tank lining plate and save energy.

[0004] In order to achieve the above-mentioned application purpose, the present application provides the following technical scheme:

[0005] The application provides a metal and nonmetal composite material, which is prepared from the following raw materials in percentage by mass: 20-35% of heat-resistant steel fibers, 25-35% of brown corundum, 15-30% of SiC, 4-6% of alpha-Al2O3 micro powder, 5-8% of calcium aluminate cement, 3-5% of silicon micro powder, 0.03-0.5% of carboxymethyl cellulose and 0.01-0.03% of polyacrylamide.

[0006] Preferably, the heat-resistant steel fibers are heat-resistant stainless steel with a brand of 314.

[0007] The diameter of the heat-resistant steel fibers is 0.5-1.5 mm, and the length is 15-50 mm.

[0008] Preferably, the brown corundum contains Al2O3 with a mass percentage of >95%.

[0009] The particle size of the brown corundum is 0-8 mm, and is not 0.

[0010] Preferably, the purity of the SiC is >97% by mass.

[0011] The particle size of the SiC is 0-1 mm, and is not 0.

[0012] Preferably, the mass percentage of SiO2 in the silicon micro powder is >95%.

[0013] The median particle size of the silicon micro powder is 0.5-1.5 μm.

[0014] The application further provides a preparation method of the metal and nonmetal composite material.

[0015] The brown corundum, SiC, silicon micro powder, calcium aluminate cement, alpha-Al2O3 micro powder, polyacrylamide and carboxymethyl cellulose are mixed, and then water is added to obtain a slurry.

[0016] The slurry is poured into a mold containing the heat-resistant steel fibers, and then vibration forming is performed, and curing and sintering are sequentially performed to obtain the metal and nonmetal composite material.

[0017] Preferably, the mass of the water accounts for 5-9% of the total mass of the brown corundum, SiC, silicon micro powder, calcium aluminate cement, alpha-Al2O3 micro powder, polyacrylamide and carboxymethyl cellulose.

[0018] Preferably, the curing includes sequentially performed first curing, second curing and third curing.

[0019] The first curing is performed for 12-24 h at a temperature of 20-30 ℃.

[0020] The second curing time is 12-24 hours, and the temperature is 110 DEG C.

[0021] The third curing time is 10-24 hours, and the temperature is 350 DEG C.

[0022] Preferably, the sintering temperature is 500-800 DEG C, the holding time is 3-5 hours, and the temperature rising rate to the sintering temperature is 10 DEG C / min.

[0023] The application further provides an application of the metal and nonmetal composite material prepared by the preparation method in a dry quenching coke drum lining plate.

[0024] The application provides a metal and nonmetal composite material, which comprises the following preparation raw materials in percentage by mass: 20-35% of heat-resistant steel fiber, 25-35% of brown corundum, 15-30% of SiC, 4-6% of alpha-Al2O3 micro powder, 5-8% of calcium aluminate cement, 3-5% of silicon micro powder, 0.03-0.5% of carboxymethyl cellulose and 0.01-0.03% of polyacrylamide. In the application, the heat-resistant steel fiber in the above dosage range can form a three-dimensional network structure in the metal and nonmetal composite material, and can significantly improve the tensile strength, bending strength, fracture toughness and thermal shock resistance of the material. In the process of high temperature and cold and hot alternation, the steel fiber can effectively prevent the expansion of micro cracks and absorb stress, so that the spalling resistance and service life of the material are greatly improved. Moreover, the heat resistance ensures that the material can still maintain certain strength and toughness at 1000 DEG C high temperature; the brown corundum in the above dosage range is one of the main refractory aggregates, has volume stability, high temperature strength and wear resistance, and can improve the oxidation resistance of the material; the SiC in the above dosage range is another key refractory aggregate, has extremely high hardness, excellent wear resistance, good thermal conductivity and excellent thermal shock resistance, meanwhile, the SiC can generate a molten silicate protective layer at high temperature, improves the oxidation resistance, and the high thermal conductivity helps to quickly and uniformly transfer heat, reduces the internal temperature difference, and thus reduces the thermal stress; the alpha-Al2O3 micro powder in the above dosage range is a fine powder component of the metal and nonmetal composite material, and its role is to fill the gaps between the aggregates and improve the compactness of the material, and its high activity can promote the formation of ceramic bonding phase in the sintering process, and improve the overall strength and wear resistance of the material; the calcium aluminate cement in the above dosage range is a main binder, provides normal temperature and medium temperature strength, and after adding water, the cement has a hydration reaction, so that the preform has sufficient green strength before sintering, and is convenient for demolding, carrying and installation. At high temperature, the cement decomposes and participates in the formation of ceramic bonding phase, and has high strength, and has the characteristics of rapid setting and hardening, stable high temperature performance and the like; the silicon micro powder in the above dosage range is an active ultrafine powder, has extremely high specific surface area and activity, helps to improve the fluidity and construction performance of the metal and nonmetal composite material at normal temperature, and the mullite generated by the reaction between the silicon micro powder and alpha-Al2O3 at high temperature has excellent high temperature performance, low thermal expansion coefficient and good anti-creep performance, and can significantly improve the high temperature stability and thermal shock resistance of the material; the carboxymethyl cellulose in the above dosage range is a water retaining agent and thickening agent, can improve the construction performance of the metal and nonmetal composite material, prevents the water from evaporating too fast, ensures the full hydration of the cement, and also provides certain initial strength; and the polyacrylamide in the above dosage range is a dispersant and water reducing agent, can improve the fluidity of the metal and nonmetal composite material, reduces the water storage amount, and improves the compactness of the metal and nonmetal composite material.In conclusion, the present application combines the toughening and thermal shock resistance of heat-resistant steel fibers, the high-temperature strength, wear resistance and thermal shock resistance of brown corundum and SiC aggregate, the dense high-temperature matrix formed by the mullitization reaction of alpha-Al2O3 and silicon powder, and the bonding strength provided by calcium aluminate cement, supplemented by carboxymethyl cellulose and polyacrylamide to improve the construction performance and density, to construct a high-performance system with multiple phases and complementary advantages. Under high temperature and severe cold and hot alternating conditions, steel fibers and SiC resist cracking and spalling caused by thermal stress, brown corundum and SiC provide wear resistance, and mullite matrix provides high-temperature structural stability and corrosion resistance, thereby significantly extending the service life of the coke tank lining plate.

[0025] The present application also provides a preparation method of the metal and non-metal composite material, comprising the following steps: mixing brown corundum, SiC, silicon powder, calcium aluminate cement, alpha-Al2O3 powder, polyacrylamide and carboxymethyl cellulose, then adding water to obtain a slurry; pouring the slurry into a mold containing heat-resistant steel fibers, then performing vibration molding, and sequentially performing curing and sintering to obtain the metal and non-metal composite material. The obtained metal and non-metal composite material has a simple preparation method, the steel fibers form a cross-network structure in the composite material and play a good supporting role, and the finally obtained composite material has excellent impact resistance and high wear resistance. DETAILED DESCRIPTION

[0026] The present application provides a metal and non-metal composite material, comprising the following preparation raw materials in mass percentage: 20-35% of heat-resistant steel fibers, 25-35% of brown corundum, 15-30% of SiC, 4-6% of alpha-Al2O3 powder, 5-8% of calcium aluminate cement, 3-5% of silicon powder, 0.03-0.5% of carboxymethyl cellulose and 0.01-0.03% of polyacrylamide.

[0027] In the present application, all the preparation raw materials are commercially available products well known to those skilled in the art, unless otherwise specified.

[0028] According to mass percentage, the preparation raw materials of the metal and non-metal composite material of the present application comprise 20-35% of heat-resistant steel fibers, and the amount of the heat-resistant steel fibers can be 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34% or 35%. In the embodiments of the present application, the amount of the heat-resistant steel fibers can be 20%, 25%, 30% or 35%.

[0029] In the present application, the heat-resistant steel fiber preferably comprises a heat-resistant stainless steel of grade 314, 446 or Te; the diameter of the heat-resistant steel fiber is preferably 0.5-1.5 mm, and the length is preferably 15-50 mm.

[0030] In the present application, the advantages of controlling the type and size of the heat-resistant steel fiber within the above range are that the type control can select the optimal steel fiber variety according to the service temperature, and the size control can select the appropriate steel fiber to form an optimal cross-network in the product according to the molding size of the composite material.

[0031] According to the mass percentage, the preparation raw material of the metal and non-metal composite material in the present application comprises 25-35% of brown corundum, and the amount of the brown corundum can be 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34% or 35%. In the embodiments of the present application, the amount of the brown corundum can be 25%, 28%, 32% or 35%.

[0032] In the present application, the content of aluminum oxide in the brown corundum is ≥95%; the particle size of the brown corundum is preferably 0-8 mm, and is not 0.

[0033] In the present application, the advantages of limiting the amount of the brown corundum within the above range are that the brown corundum plays a role in wear resistance and can support the steel fiber, and too much or too little will affect the skeleton structure of the steel fiber. The advantages of limiting the composition and size of the brown corundum within the above range are that the brown corundum cooperates with the steel fiber to form a network skeleton of the composite material.

[0034] According to the mass percentage, the preparation raw material of the metal and non-metal composite material in the present application comprises 15-30% of SiC, and the amount of the SiC can be 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29% or 30%. In the embodiments of the present application, the amount of the SiC can be 15%, 20%, 25% or 30%.

[0035] In the present application, the purity of the SiC is preferably >97wt%; the particle size of the SiC is preferably 0-1 mm, and is not 0.

[0036] In the present application, the advantages of limiting the amount of the silicon carbide within the above range are that the silicon carbide plays a role in improving the thermal shock resistance, chemical corrosion resistance and acid slag corrosion resistance of the material. The advantages of limiting the particle size of the silicon carbide within the above range are that the silicon carbide can be relatively uniformly dispersed in the ceramic matrix.

[0037] The preparation raw material of the metal and nonmetal composite material according to the application comprises 4-6% of α-Al2O3 micro powder, and the amount of the α-Al2O3 micro powder can be 4%, 4.2%, 4.4%, 4.6%, 4.8%, 5.0%, 5.2%, 5.4%, 5.6%, 5.8% or 6.0%. In the embodiment of the application, the amount of the α-Al2O3 micro powder can be 4.0%, 4.5%, 5.0% or 6.0%.

[0038] In the application, the particle size of the α-Al2O3 micro powder is preferably 1-5 μm.

[0039] In the application, the amount of the α-Al2O3 micro powder is limited in the above range, which has the advantage of synthesizing mullite, a good refractory material, with the silicon micro powder during use, and the particle size of the α-Al2O3 micro powder is controlled in the above range, which has the advantage of high reactivity.

[0040] The preparation raw material of the metal and nonmetal composite material according to the application comprises 5-8% of calcium aluminate cement, and the amount of the calcium aluminate cement can be 5%, 5.5%, 6.0%, 6.5%, 7.0%, 7.5% or 8.0%. In the embodiment of the application, the amount of the calcium aluminate cement can be 5%, 6%, 7% or 8%.

[0041] In the application, the calcium aluminate cement is preferably pure calcium aluminate cement.

[0042] In the application, the amount of the calcium aluminate cement is limited in the above range, which has the advantage of generating sufficient bonding strength.

[0043] The preparation raw material of the metal and nonmetal composite material according to the application comprises 3-5% of silicon micro powder, and the amount of the silicon micro powder can be 3%, 3.5%, 4%, 4.5% or 5%. In the embodiment of the application, the amount of the silicon micro powder can be 4% or 5%.

[0044] In the application, the mass percentage of SiO2 in the silicon micro powder is preferably >95%, and the median particle size of the silicon micro powder is preferably 1 μm.

[0045] In the application, the amount of the silicon micro powder is controlled in the above range, which has the advantage of generating mullite material with good performance by reacting with the α-Al2O3 micro powder mentioned above, and improving the high-temperature performance of the composite material; and the size of the silicon micro powder is controlled in the above range, which has the advantage of high reactivity.

[0046] The preparation raw material of the metal and non-metal composite material according to the application comprises 0.03-0.5% of carboxymethyl cellulose by mass fraction, and the amount of the carboxymethyl cellulose can be 0.03%, 0.06%, 0.09%, 0.12%, 0.15%, 0.18%, 0.21%, 0.24%, 0.27%, 0.30%, 0.33%, 0.36%, 0.39%, 0.42%, 0.45%, 0.48% or 0.5%. In the embodiment of the application, the amount of the carboxymethyl cellulose can be 0.5%.

[0047] In the application, the advantage of controlling the amount of the carboxymethyl cellulose within the above range is to reduce the amount of water and improve the density of the product after molding;

[0048] The preparation raw material of the metal and non-metal composite material according to the application comprises 0.01-0.03% of polyacrylamide by mass fraction, and the amount of the polyacrylamide can be 0.01%, 0.02% or 0.03%. In the embodiment of the application, the amount of the polyacrylamide can be 0.03%.

[0049] In the application, the advantage of controlling the amount of the polyacrylamide within the above range is to reduce the amount of water under the condition of ensuring that the material system after water mixing has sufficient fluidity, so that the composite material has higher density.

[0050] The application further provides a preparation method of the metal and non-metal composite material according to the above technical solution, comprising the following steps:

[0051] The brown corundum, SiC, silicon powder, calcium aluminate cement, alpha-Al2O3 powder, polyacrylamide and carboxymethyl fiber are mixed, and then water is added to obtain a slurry;

[0052] The slurry is poured into a mold containing heat-resistant steel fibers, and then vibration molding is performed, and curing and sintering are sequentially performed to obtain the metal and non-metal composite material.

[0053] The application mixes the brown corundum, SiC, silicon powder, calcium aluminate cement, alpha-Al2O3 powder, polyacrylamide and carboxymethyl fiber, and then adds water to obtain a slurry.

[0054] In the application, the mass of the water preferably accounts for 5%-9% of the total mass of the brown corundum, SiC, silicon powder, calcium aluminate cement, alpha-Al2O3 powder, polyacrylamide and carboxymethyl fiber, and preferably 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5% or 9%.

[0055] In the present application, the mixing is preferably performed under stirring, and the present application does not have any particular limitation on the process of the stirring, and it is performed using a process well known to those skilled in the art and ensuring that a slurry having good fluidity is formed.

[0056] After the slurry is obtained, the present application pours the slurry into a mold containing heat-resistant steel fibers, performs vibration molding, sequentially performs curing and sintering, and obtains the metal and non-metal composite material.

[0057] In the present application, the dispersion state of the heat-resistant steel fibers in the mold containing heat-resistant steel fibers is preferably uniform cross dispersion.

[0058] The present application does not have any particular limitation on the process of the vibration molding, and it is performed using a process well known to those skilled in the art and ensuring that the slurry is filled into each space of the heat-resistant steel fibers and the mold and tightly wraps each of the heat-resistant steel fibers.

[0059] In the present application, the curing preferably includes sequentially performed first curing, second curing, and third curing, the first curing is preferably performed in the mold of the vibration molding, the temperature of the first curing is preferably 20-30℃, and the time is preferably 12-24h, the temperature of the first curing can be 25℃, and the time can be 12h, 13h, 14h, 15h, 16h, 17h, 18h, 19h, 20h, 21h, 22h, 23h, or 24h.

[0060] In the present application, the first curing serves to hydrate the calcium aluminate cement to form a hydration product and to generate initial strength of the composite material.

[0061] After the first curing is completed, it also preferably includes demolding, and the present application does not have any particular limitation on the process of the demolding, and it is performed using a process well known to those skilled in the art.

[0062] In the present application, the temperature of the second curing is preferably 110℃, and the time is preferably 12-24h, which can be 12h, 13h, 14h, 15h, 16h, 17h, 18h, 19h, 20h, 21h, 22h, 23h, or 24h. In an embodiment of the present application, the temperature of the second curing can be 110℃, and the time can be 24h. In the present application, the second curing is preferably performed in a dry kiln.

[0063] In the present application, the second curing serves to remove free water from the product.

[0064] In the present application, the temperature of the third curing is preferably 350℃, and the time is preferably 10-24h; the time of the third curing can be 10h, 11h, 12h, 13h, 14h, 15h, 16h, 17h, 18h, 19h, 20h, 21h, 22h, 23h or 24h. In the present application, the third curing is preferably carried out in a dry kiln.

[0065] In the present application, the third curing is to remove the crystal water.

[0066] In the present application, the sintering is preferably carried out in an oxidizing atmosphere; the temperature of the sintering is preferably 500-800℃, and can be 500℃, 530℃, 560℃, 590℃, 620℃, 650℃, 680℃, 710℃, 740℃, 770℃ or 800℃; the holding time of the sintering is preferably 3-5h, and can be 3h, 3.5h, 4h, 4.5h or 5h; the heating rate to the temperature of the sintering is preferably 10℃ / min. In the embodiments of the present application, the temperature of the sintering can be 560℃, and the holding time can be 5h. In the embodiments of the present application, the sintering is carried out in an electric furnace.

[0067] In the present application, the sintering is to make the product more dense.

[0068] After the sintering is completed, the present application also preferably comprises cooling, and the present application does not have any special limitation on the process of the cooling, which can be carried out by using the processes well known to those skilled in the art.

[0069] The present application also provides the application of the metal and nonmetal composite material in the above technical solution or the metal and nonmetal composite material prepared by the preparation method in the above technical solution in the dry quenching coke tank lining plate. The present application does not have any special limitation on the method of the application, which can be carried out by using the methods well known to those skilled in the art.

[0070] The technical solutions in the present application will be described clearly and completely by combining the embodiments in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without any creative labor fall within the protection scope of the present application.

[0071] Embodiment 1

[0072] Preparation raw materials: heat-resistant steel fiber (heat-resistant stainless steel with a brand of 314, a diameter of 0.5-1.5 mm, and a length of 15-50 mm) 20%, brown corundum (including > 95wt% of Al2O3, a particle size of 0-8 mm, and not 0) 35%, SiC (a purity of > 97wt%, a particle size of 0-1 mm and not 0) 30%, α-Al2O3 micro powder (a particle size of 1-5 μm) 6%, calcium aluminate cement (pure calcium aluminate cement, a type of commercially available) 5%, silicon micro powder (a particle size of 0.5-1.5 μm, a content of silicon dioxide of > 95%) 4%, carboxymethyl cellulose 0.5% and polyacrylamide 0.03%;

[0073] Preparation process:

[0074] After the brown corundum, SiC, silicon micro powder, calcium aluminate cement, α-Al2O3 micro powder, polyacrylamide and carboxymethyl fiber are stirred and mixed, water (6% of the total mass of the brown corundum, SiC, silicon micro powder, calcium aluminate cement, α-Al2O3 micro powder, polyacrylamide and carboxymethyl fiber) is added, stirred, and a slurry is obtained;

[0075] The heat-resistant steel fiber is uniformly placed in a mold for preparing a coke tank lining plate to obtain a mold containing heat-resistant steel fiber;

[0076] After the slurry is poured into the mold containing heat-resistant steel fiber, vibration molding is performed to fill the slurry in the space of the steel fiber and the mold, and tightly wrap each steel fiber, and then the mold is cured for 24 h (at a temperature of 25°C), and then demolding; the preform after demolding is placed in a 110°C oven for drying and curing for 24 h, and then placed in a 350°C drying kiln for drying and curing for 20 h, and finally the obtained preform is placed in an electric furnace for sintering at 560°C for 5 h, and then cooled to obtain a metal and non-metal composite material (high strength, high wear resistance, excellent thermal shock resistance, and excellent anti-washing performance).

[0077] Example 2

[0078] Preparation raw materials: heat-resistant steel fiber (heat-resistant stainless steel with a brand of 314, a diameter of 0.5-1.5 mm, and a length of 15-50 mm) 20%, brown corundum (including > 95wt% of Al2O3, a particle size of 0-8 mm, and not 0) 35%, SiC (a purity of > 97wt%, a particle size of 0-1 mm and not 0) 30%, α-Al2O3 micro powder (a particle size of 1-5 μm) 6%, calcium aluminate cement (pure calcium aluminate cement, a type of commercially available) 5%, silicon micro powder (a particle size of 0.5-1.5 μm, a content of silicon dioxide of > 95%) 4%, carboxymethyl cellulose 0.5% and polyacrylamide 0.03%;

[0079] Preparation process:

[0080] The brown corundum, SiC, silicon powder, calcium aluminate cement, α-Al2O3 powder, polyacrylamide and carboxymethyl fiber are stirred and mixed, then water (6% of the total mass of the brown corundum, SiC, silicon powder, calcium aluminate cement, α-Al2O3 powder, polyacrylamide and carboxymethyl fiber) is added and stirred to obtain a slurry;

[0081] The heat-resistant steel fibers are uniformly placed in a mold for preparing a coke tank lining plate to obtain a mold containing heat-resistant steel fibers;

[0082] After the slurry is poured into the mold containing heat-resistant steel fibers, vibration forming is performed to fill the slurry in the spaces of the steel fibers and the mold, and tightly wrap each steel fiber, then the mold is cured for 24 hours (at a temperature of 25°C), and then demolding is performed; the preform after demolding is placed in a 110°C oven for drying and curing for 24 hours, then placed in a 350°C drying kiln for drying and curing for 20 hours, and finally the obtained preform is placed in an electric furnace for sintering at 560°C for 5 hours, and then cooled to obtain a metal and non-metal composite material (high strength, high wear resistance, excellent thermal shock resistance, and excellent anti-washing performance).

[0083] Example 3

[0084] Preparation of raw materials: heat-resistant steel fibers (heat-resistant stainless steel with a brand of 314, a diameter of 0.5-1.5mm, and a length of 15-50mm) 25%, brown corundum (including >95wt% Al2O3, a particle size of 0-8mm, and not 0) 35%, SiC (purity >97wt%, particle size 0-1mm and not 0) 25%, α-Al2O3 powder (particle size 1-5μm) 6%, calcium aluminate cement (pure calcium aluminate cement, type commercially available) 5%, silicon powder (particle size 0.5-1.5μm, content of silicon dioxide >95%) 4%, carboxymethyl cellulose 0.5% and polyacrylamide 0.03%;

[0085] Preparation process:

[0086] The brown corundum, SiC, silicon powder, calcium aluminate cement, α-Al2O3 powder, polyacrylamide and carboxymethyl fiber are stirred and mixed, then water (6% of the total mass of the brown corundum, SiC, silicon powder, calcium aluminate cement, α-Al2O3 powder, polyacrylamide and carboxymethyl fiber) is added and stirred to obtain a slurry;

[0087] The heat-resistant steel fibers are uniformly placed in a mold for preparing a coke tank lining plate to obtain a mold containing heat-resistant steel fibers;

[0088] After the slurry is poured into the mold containing the heat-resistant steel fibers, vibration molding is performed to fill the slurry in the spaces of the steel fibers and the mold, and tightly wrap each steel fiber, and then the mold is cured for 24 hours (at a temperature of 25°C), and then demolded; the preform after demolding is placed into an oven at 110°C for drying and curing for 24 hours, and then placed into a dry kiln at 350°C for drying and curing for 20 hours, and finally the obtained preform is placed into an electric furnace at 560°C for sintering for 5 hours, and then cooled, to obtain a metal and non-metal composite material (high strength, high wear resistance, excellent thermal shock resistance, and excellent erosion resistance).

[0089] Comparative Example 1

[0090] Reference Example 1, except that no heat-resistant steel fibers are added.

[0091] Comparative Example 2

[0092] Reference Example 1, except that the heat-resistant steel fibers are replaced by ordinary carbon steel fibers (commercially available).

[0093] Comparative Example 3

[0094] Reference Example 1, except that in the preparation process, the heat-resistant steel fibers are directly mixed with brown corundum, SiC, silicon powder, calcium aluminate cement, α-Al2O3 powder, polyacrylamide, and carboxymethyl fiber, and the obtained slurry after mixing is sequentially subjected to vibration molding, curing, and sintering.

[0095] Test Example

[0096] The performance parameters of the metal and non-metal composite materials of Examples 1-3, the ceramic composite material of Comparative Example 1, and the metal and non-metal composite materials of Comparative Examples 2-3 are shown in Table 1:

[0097] Table 1 Performance parameters of the metal and non-metal composite materials of Examples 1-3, the ceramic composite material of Comparative Example 1, and the metal and non-metal composite materials of Comparative Examples 2-3

[0098]

[0099] As shown in Table 1, the heat-resistant steel fibers significantly improve the thermal shock resistance and high-temperature bending strength of the material, and the fibers have toughening and crack propagation prevention effects. The fiber laying method has a direct impact on the performance of the material, and the pre-laying method is beneficial to form a more uniform and effective fiber skeleton network structure, which can better play the reinforcing and toughening effects of the fibers.

[0100] The above only describes the preferred embodiments of the present application, and does not limit the present application in any form. It should be noted that for ordinary skilled persons in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should also be considered as the protection scope of the present application.

Claims

1. A metallic-nonmetallic composite material, characterized in that, The raw materials, by weight percentage, include the following: 20-35% heat-resistant steel fiber, 25-35% brown corundum, 15-30% SiC, 4-6% α-Al2O3 micro powder, 5-8% calcium aluminate cement, 3-5% silica fume, 0.03-0.5% carboxymethyl cellulose and 0.01-0.03% polyacrylamide.

2. The metal-nonmetal composite material as described in claim 1, characterized in that, The heat-resistant steel fibers include heat-resistant stainless steel of grade 314; The heat-resistant steel fibers have a diameter of 0.5 mm to 1.5 mm and a length of 15 to 50 mm.

3. The metal-nonmetal composite material as described in claim 1, characterized in that, The brown fused alumina comprises ≥95wt% Al2O3; The brown fused alumina has a particle size of 0–8 mm, and is not 0 mm.

4. The metal-nonmetal composite material as described in claim 1, characterized in that, The purity of the SiC is >97wt%; The particle size of the SiC is 0 to 1 mm, and is not 0.

5. The metal-nonmetal composite material as described in claim 1, characterized in that, The mass percentage of SiO2 in the silicon micropowder is >95%; The median particle size of the silicon micropowder is 0.5–1.5 μm.

6. The method for preparing the metal-nonmetal composite material according to any one of claims 1 to 5, characterized in that, Includes the following steps: Brown fused alumina, SiC, silica fume, calcium aluminate cement, α-Al2O3 micro powder, polyacrylamide and carboxymethyl cellulose are mixed and then water is added to obtain a slurry. After the slurry is poured into a mold containing heat-resistant steel fibers, it is vibrated and molded, then cured and sintered in sequence to obtain the metal-nonmetal composite material.

7. The preparation method according to claim 6, characterized in that, The water accounts for 5% to 9% of the total mass of the brown fused alumina, SiC, silica fume, calcium aluminate cement, α-Al2O3 fume, polyacrylamide, and carboxymethyl cellulose.

8. The preparation method according to claim 6, characterized in that, The maintenance includes a first maintenance, a second maintenance, and a third maintenance performed sequentially; The first curing period is 12-24 hours, and the temperature is 20-30℃; The second curing period is 12–24 hours, and the temperature is 110℃; The third curing period is 10–24 hours, and the temperature is 350℃.

9. The preparation method according to claim 6, characterized in that, The sintering temperature is 500–800℃, the holding time is 3–5 h, and the heating rate to the sintering temperature is 10℃ / min.

10. The application of the metal-nonmetal composite material according to any one of claims 1 to 5 or the metal-nonmetal composite material prepared by the preparation method according to any one of claims 6 to 9 in the lining of a dry quenching coke pot.

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