CN115677330A - Self-lubricating blind plate for tundish and preparation method thereof - Google Patents
Self-lubricating blind plate for tundish and preparation method thereof Download PDFInfo
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- CN115677330A CN115677330A CN202210904403.3A CN202210904403A CN115677330A CN 115677330 A CN115677330 A CN 115677330A CN 202210904403 A CN202210904403 A CN 202210904403A CN 115677330 A CN115677330 A CN 115677330A
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- 238000002360 preparation method Methods 0.000 title abstract description 9
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 50
- 239000010431 corundum Substances 0.000 claims abstract description 50
- 239000000843 powder Substances 0.000 claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229910052582 BN Inorganic materials 0.000 claims abstract description 24
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 18
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000004568 cement Substances 0.000 claims abstract description 15
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims abstract description 14
- 238000005266 casting Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 239000002245 particle Substances 0.000 claims description 15
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical group [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 10
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 10
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 10
- 229920005646 polycarboxylate Polymers 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 2
- 238000005461 lubrication Methods 0.000 abstract description 4
- 230000003647 oxidation Effects 0.000 abstract description 4
- 238000007254 oxidation reaction Methods 0.000 abstract description 4
- 239000011819 refractory material Substances 0.000 abstract description 2
- 210000000988 bone and bone Anatomy 0.000 description 15
- 238000005452 bending Methods 0.000 description 10
- 238000012360 testing method Methods 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000000314 lubricant Substances 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 238000009749 continuous casting Methods 0.000 description 7
- 230000002829 reductive effect Effects 0.000 description 6
- 230000035939 shock Effects 0.000 description 6
- 229910002804 graphite Inorganic materials 0.000 description 5
- 239000010439 graphite Substances 0.000 description 5
- 230000001050 lubricating effect Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000005245 sintering Methods 0.000 description 4
- 229910052810 boron oxide Inorganic materials 0.000 description 3
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- RWDBMHZWXLUGIB-UHFFFAOYSA-N [C].[Mg] Chemical compound [C].[Mg] RWDBMHZWXLUGIB-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- RQMIWLMVTCKXAQ-UHFFFAOYSA-N [AlH3].[C] Chemical compound [AlH3].[C] RQMIWLMVTCKXAQ-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- OJMOMXZKOWKUTA-UHFFFAOYSA-N aluminum;borate Chemical compound [Al+3].[O-]B([O-])[O-] OJMOMXZKOWKUTA-UHFFFAOYSA-N 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
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- 230000000052 comparative effect Effects 0.000 description 1
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- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000009766 low-temperature sintering Methods 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention discloses a self-lubricating blind plate for a tundish and a preparation method thereof. Belongs to the field of unshaped refractory materials, and comprises the following raw materials in percentage by mass: sintered plate-like corundum aggregate, sintered plate-like corundum fine powder, alpha-Al 2 O 3 Micro powder, pure calcium aluminate cement, hexagonal boron nitride fine powder and a water reducing agent. The preparation method comprises the following steps: preparing a castable; adding 5.5-6.8% of water into the casting material, stirring uniformly, forming, curing for 2-3 days, demoulding, baking, and performing heat treatment at 800-1000 ℃ for 3-5 hours to finally obtain the finished product. The invention provides a self-lubricating blind plate for a tundish. The hexagonal boron nitride with the layered lubrication characteristic is added in the blind plate, so that the blind plate has good oxidation resistance and self-lubrication characteristic at high temperature, can be sintered at the low temperature of 800-1000 ℃, and has higher service efficiency and longer service life compared with the traditional corundum casting material blind plate.
Description
Technical Field
The invention belongs to the field of unshaped refractory materials, relates to a self-lubricating blind plate for a tundish, and more particularly relates to a self-lubricating blind plate for a tundish and a preparation method thereof.
Background
The traditional tundish adopts a sizing nozzle fixed at the bottom of the tundish for continuous casting, the service life of the nozzle is short, the tundish is frequently replaced, the molten steel casting allowance is large, and the head cutting, tail cutting and waste amount of continuous casting billets after each casting time are large; in the later casting period, due to erosion of a water gap, the casting blank is pulled at an excessively high speed, so that the quality of the casting blank is reduced and a breakout accident is possibly caused. Therefore, related researchers develop a quick replacement technology (ZL 95233533) for the metering nozzle of the continuous casting tundish, the metering nozzle with the expired service life is replaced under the condition of protecting casting, the continuous casting pulling speed is stabilized within the range required by regulations, no adverse effect is caused on the molten steel injection flow of the tundish and the molten steel liquid level in the crystallizer, and the continuous casting operation and the stability of the quality of a casting blank are ensured. By changing the fixed diameter water gap for many times, the continuous casting time of the tundish single-ladle is greatly improved under the condition that the continuous casting molten steel is not cut off, the casting blank quality and the yield are also improved, the raw material consumption is reduced, and the labor intensity is reduced. In order to achieve the purpose, when a water gap is replaced, a stopper rod is needed to plug a molten steel flow channel, meanwhile, partial molten steel remains in the water gap, and a sliding mechanism is arranged between a tundish water gap and a long water gap to be matched with a tundish blind plate for safety, so that the tundish blind plate can freely slide to plug and cut the molten steel. In the process, the sliding of the water gap and the blind plate is required to be as smooth and fast as possible, and the lubricating property of the water gap and the blind plate is required to be higher.
In fact, in the field of converter and ladle sliding nozzles, aluminum-carbon and magnesium-carbon sliding plates containing carbon raw materials such as flake graphite are generally adopted at present, and the self lubricity of the flake graphite is utilized to reduce the abrasion of the sliding plate in the using process, improve the production efficiency and prolong the service life of the sliding plate. However, graphite is easily oxidized at high temperature, resulting in deterioration of lubricity for roughening the slip surface. Aiming at the problem, on one hand, the lubricating property of the sliding surface is ensured by coating a lubricant paint on the sliding surface, but the preparation cost of the high-temperature lubricant is higher, so that the production cost is higher; on the other hand, the sliding plate is prevented from being oxidized and the sliding plate is ensured to be used through the sealing design of the sliding plate mechanism or the protection of protective atmosphere, but the tundish quick-change nozzle mechanism is open, lacks corresponding anti-oxidation measures and is not suitable for adopting carbon-containing materials as a blind plate. Therefore, the currently adopted tundish blind plate is mainly made of corundum castable, but the surface is rough and lacks lubrication, so that the resistance is very large in the sliding process, and great inconvenience is caused to the use.
Hexagonal boron nitride has a layered structure similar to crystalline flake graphite, thus showing similar lubricity and having higher oxidation resistance, and is a common high-temperature lubricant. By introducing hexagonal boron nitride into the magnesium-carbon sliding plate and utilizing the characteristics of high temperature resistance, oxidation resistance, toughness and lubrication, researchers prepare the self-lubricating magnesium slag-stopping sliding plate brick (CN 108585797A) with better high temperature resistance, erosion resistance, scouring resistance and thermal shock stability. In addition, researches show that the small amount of added hexagonal boron nitride (less than or equal to 2 percent) is beneficial to improving the compactness and the mechanical property of the castable after medium-temperature treatment, and simultaneously plays the role of a layered structure to improve the thermal shock stability of the material, but the hexagonal boron nitride has lower content and poorer lubricity (the addition of h-BN has influence on the performance of the low-cement corundum castable.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to solve the problem of relatively high lubricating property of a corundum blind plate, and provides the corundum blind plate with self-lubricating property, low firing temperature, good thermal shock stability and long service life and the preparation method thereof.
The technical scheme is as follows: the invention relates to a self-lubricating blind plate for a tundish, which comprises the following raw materials in percentage by mass: 68-72% of sintered tabular corundum aggregate, 12-16% of sintered tabular corundum fine powder and alpha-Al 2 O 3 1 to 3 percent of micro powder, 8 to 12 percent of pure calcium aluminate cement, 3 to 5 percent of hexagonal boron nitride fine powder and 0.1 to 0.2 percent of water reducing agent.
Further, the particle grading of the sintered tabular corundum aggregate is as follows by mass: 20 to 26 percent of the material with the thickness of 5 to 3mm, 16 to 24 percent of the material with the thickness of 3 to 1mm and 20 to 26 percent of the material with the thickness of 1 to 0.1 mm.
Furthermore, the grain size of the sintered plate-shaped corundum fine powder is less than or equal to 0.088mm.
Further, the alpha-Al 2 O 3 The average particle diameter of the fine powder is 1 to 3 μm.
Further, al in the pure calcium aluminate cement 2 O 3 The content is more than or equal to 70wt percent, and the average particle size is 3-14 mu m.
Furthermore, the h-BN content in the hexagonal boron nitride fine powder is more than or equal to 95wt%, and the average particle size is 3-45 mu m.
Further, the water reducing agent is sodium hexametaphosphate, a polycarboxylate water reducing agent or a mixture of the sodium hexametaphosphate and the polycarboxylate water reducing agent.
Further, the preparation method of the self-lubricating blind plate for the tundish comprises the following specific operation steps:
preparing sintered tabular corundum aggregate, sintered tabular corundum fine powder and alpha-Al 2 O 3 Mixing the micro powder, the pure calcium aluminate cement, the hexagonal boron nitride fine powder and the water reducing agent to prepare the castable;
adding 5.5-6.8% of water into the casting material, stirring uniformly, forming, curing for 2-3 days, demoulding, baking, and performing heat treatment at 800-1000 ℃ for 3-5 hours to finally obtain the finished product.
Has the advantages that: compared with the prior art, the invention has the characteristics that: 1. the hexagonal boron nitride has excellent oxidation resistance and lubricating property, so that the corundum blind plate castable prepared by the invention has good lubricating property when used at high temperature, the sliding efficiency of the blind plate is improved, the wear of the blind plate in the sliding process is reduced, and the service life of the blind plate is prolonged; 2. as the hexagonal boron nitride is naturally oxidized or is oxidized a little to form boron oxide in the sintering process, the boron oxide can be melted to form a liquid phase at the temperature of more than 557 ℃, the sintering densification of the matrix structure is promoted, and the boron oxide can also react with alumina to form an aluminum borate ceramic phase to improve the matrix strength. The traditional calcium aluminate bonded corundum castable has greatly reduced strength due to dehydration of hydrated product bonding phase at 800-1000 ℃, and is often densified by high-temperature sintering at 1200-1400 ℃ to ensure sufficient strength. Therefore, the corundum blind plate castable prepared by the invention can be sintered at a low temperature of 800-1000 ℃, so that the energy consumption can be greatly reduced; 3. due to the high thermal conductivity and the layered structure of the hexagonal boron nitride, the corundum blind plate castable can play a role of relieving thermal stress similar to graphite when bearing thermal shock at high temperature, has high thermal shock stability, and has higher safety and longer service life under the cold and hot shock caused by frequent contact and separation with molten steel.
Detailed Description
The present invention will be further described with reference to the following examples.
The invention relates to a self-lubricating blind plate for a tundish, which adopts the technical scheme that:
the castable comprises the following raw materials in parts by mass: 68-72% of sintered tabular corundum aggregate, 12-16% of sintered tabular corundum fine powder and alpha-Al 2 O 3 1 to 3 percent of micro powder, 8 to 12 percent of pure calcium aluminate cement, 3 to 5 percent of hexagonal boron nitride fine powder and 0.1 to 0.2 percent of external water reducing agent.
The particle composition of the sintered tabular corundum aggregate is as follows by mass: 20 to 26 percent of the material with the thickness of 5 to 3mm, 16 to 24 percent of the material with the thickness of 3 to 1mm and 20 to 26 percent of the material with the thickness of 1 to 0.1 mm.
The grain size of the sintered tabular corundum fine powder is less than or equal to 0.088mm.
The alpha-Al 2 O 3 The average particle diameter of the fine powder is 1 to 3 μm.
Al in the pure calcium aluminate cement 2 O 3 The content is more than or equal to 70wt percent, and the average particle size is 3-14 mu m.
The h-BN content in the hexagonal boron nitride fine powder is more than or equal to 95wt%, and the average particle size is 3-45 mu m.
The water reducing agent is sodium hexametaphosphate, or a polycarboxylate water reducing agent, or a mixture of the sodium hexametaphosphate and the polycarboxylate water reducing agent.
The preparation method of the corundum blind plate castable comprises the steps of adding 5.5-6.8% of water into the castable, uniformly stirring, forming, maintaining for 2-3 days, demoulding, baking, and carrying out heat treatment at 800-1000 ℃ for 3-5 hours to obtain the corundum blind plate castable.
Example 1:
a self-lubricating blind plate for a tundish comprises the following raw materials in parts by mass: 26 percent of sintered plate-shaped corundum bone with the thickness of 5-3 mm, 20 percent of sintered plate-shaped corundum bone with the thickness of 3-1 mm and 1-0 percent of sintered plate-shaped corundum bone with the thickness of 3-1 mm.26% of 1mm, 12% of sintered tabular corundum fine powder and alpha-Al 2 O 3 3% of micro powder, 10% of pure calcium aluminate cement, 3% of hexagonal boron nitride fine powder (with the particle size of 3-14 mu m), 0.1% of sodium hexametaphosphate and 0.1% of polycarboxylate water reducing agent respectively; and adding 5.5% of water into the castable, uniformly stirring, forming, maintaining for 2 days, demolding, baking, and performing heat treatment at 1000 ℃ for 3 hours to obtain the self-lubricating blind plate for the tundish.
The bending strength of the blind plate after being baked is 14.0MPa, the bending strength of the blind plate after being baked at the low temperature of 1000 ℃ is 15.6MPa, the strength is slightly improved, and the use requirement is met. The industrial test is carried out on a tundish at the temperature of 1530 ℃, the sliding surface is checked after each test, if the sliding surface has no scratch mark, the tundish is continuously used, and if obvious scratches or cracks appear, the tundish is stopped to be used and is replaced by the next set. Using the high temperature lubricant prepared in this example, 50 industrial trials were conducted with an average number of continuous sliding of 2.5 per set.
Example 2:
a self-lubricating blind plate for a tundish comprises the following raw materials in parts by mass: 26 percent of sintered plate-shaped corundum bone with the thickness of 5-3 mm, 16 percent of sintered plate-shaped corundum bone with the thickness of 3-1 mm, 26 percent of sintered plate-shaped corundum bone with the thickness of 1-0.1 mm, 16 percent of sintered plate-shaped corundum fine powder and alpha-Al 2 O 3 3 percent of micro powder, 8 percent of pure calcium aluminate cement, 5 percent of hexagonal boron nitride fine powder (with the grain diameter of 14-45 mu m) and 0.2 percent of sodium hexametaphosphate. Adding 6.0% of water into the castable, uniformly stirring, forming, maintaining for 3 days, demolding, baking, and performing heat treatment at 800 ℃ for 5 hours to obtain the self-lubricating blind plate for the tundish.
The bending strength of the blind plate after baking is 13.4MPa, the bending strength of the blind plate after low-temperature sintering at 800 ℃ is 14.5MPa, the strength is slightly improved, and the blind plate meets the use requirements. Carrying out industrial tests on a tundish at the temperature of 1530 ℃, inspecting a sliding surface after each test, continuously using the tundish if the sliding surface has no scratch mark, and stopping using the tundish and replacing the tundish for the next time if obvious scratches or cracks appear; using the high temperature lubricant prepared in this example, 50 industrial trials were conducted with an average number of continuous sliding times of 3.6 per set.
Example 3:
self-lubricating blind plate for tundishThe corundum blind plate castable comprises the following raw materials in parts by mass: 26 percent of sintered tabular corundum bone with the thickness of 5-3 mm, 18 percent of sintered tabular corundum bone with the thickness of 3-1 mm, 24 percent of sintered tabular corundum bone with the thickness of 1-0.1 mm, 13 percent of sintered tabular corundum fine powder and alpha-Al 2 O 3 3% of micro powder, 12% of pure calcium aluminate cement, 2% of hexagonal boron nitride fine powder (with the particle size of 3-14 microns), 2% of hexagonal boron nitride fine powder (with the particle size of 14-45 microns) and 0.2% of polycarboxylate water reducing agent. Adding 6.0% of water into the castable, uniformly stirring, forming, maintaining for 3 days, demolding, baking, and performing heat treatment at 800 ℃ for 5 hours to obtain the self-lubricating blind plate for the tundish.
The bending strength of the blind plate after being baked is detected to be 12.9MPa, the bending strength of the blind plate after being baked at the low temperature of 800 ℃ is detected to be 13.9MPa, the strength is slightly improved, and the use requirement is met. The industrial test is carried out on a tundish at the temperature of 1530 ℃, the sliding surface is checked after each test, if the sliding surface has no scratch mark, the tundish is continuously used, and if obvious scratches or cracks appear, the tundish is stopped to be used and is replaced by the next set. Using the high temperature lubricant prepared in this example, 50 industrial trials were conducted with an average number of continuous sliding of 2.9 per set.
Example 4:
a self-lubricating blind plate for a tundish comprises the following raw materials in parts by mass: 24 percent of sintered plate-shaped corundum bone with the thickness of 5-3 mm, 20 percent of sintered plate-shaped corundum bone with the thickness of 3-1 mm, 26 percent of sintered plate-shaped corundum bone with the thickness of 1-0.1 mm, 15 percent of sintered plate-shaped corundum fine powder and alpha-Al 2 O 3 1% of micro powder, 10% of pure calcium aluminate cement, 2% of hexagonal boron nitride fine powder (with the grain diameter of 3-14 mu m), 2% of hexagonal boron nitride fine powder (with the grain diameter of 14-45 mu m) and 0.1% of sodium hexametaphosphate. Adding 6.8% of water into the castable, uniformly stirring, forming, maintaining for 3 days, demolding, baking, and performing heat treatment at 900 ℃ for 4 hours to obtain the self-lubricating blind plate for the tundish.
The bending strength of the blind plate after being baked is detected to be 13.1MPa, the bending strength of the blind plate after being baked at the low temperature of 900 ℃ is detected to be 14.2MPa, the strength is slightly improved, and the use requirement is met. Carrying out industrial tests on a tundish at the temperature of 1530 ℃, inspecting a sliding surface after each test, continuously using the tundish if the sliding surface has no scratch mark, and stopping using the tundish and replacing the tundish for the next time if obvious scratches or cracks appear; using the high temperature lubricant prepared in this example, 50 industrial trials were conducted with an average number of continuous sliding times of 3.1 per set.
Comparative example 1:
a self-lubricating blind plate for a tundish comprises the following raw materials in parts by mass: 26 percent of sintered plate-shaped corundum bone with the thickness of 5-3 mm, 20 percent of sintered plate-shaped corundum bone with the thickness of 3-1 mm, 26 percent of sintered plate-shaped corundum bone with the thickness of 1-0.1 mm, 15 percent of sintered plate-shaped corundum fine powder and alpha-Al 2 O 3 3 percent of micro powder, 10 percent of pure calcium aluminate cement, 0.1 percent of sodium hexametaphosphate and 0.1 percent of polycarboxylate water reducing agent respectively. And adding 5.5% of water into the castable, uniformly stirring, forming, maintaining for 2 days, demolding, baking, and performing heat treatment at 1000 ℃ and 1400 ℃ for 3 hours respectively to obtain the common blind plate for the tundish.
The bending strength of the blind plate after being baked is detected to be 12.5MPa, the bending strength of the blind plate after being baked at the low temperature of 1000 ℃ is detected to be 5.9MPa, and the strength reduction is obviously difficult to meet the use requirement; the rupture strength after high-temperature sintering at 1400 ℃ is 15.5MPa, and the use requirement is met. The industrial test is carried out on a tundish at the temperature of 1530 ℃, the sliding surface is checked after each test, if the sliding surface has no scratch mark, the tundish is continuously used, and if obvious scratches or cracks appear, the tundish is stopped to be used and is replaced by the next set. Using the high temperature lubricant prepared in this example, 50 industrial trials were conducted with an average number of continuous sliding of 1.0 per set.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (8)
1. The self-lubricating blind plate for the tundish is characterized by comprising the following raw materials in percentage by mass: 68-72 percent of sintered tabular corundum aggregate and 12-16 percent of sintered tabular corundum fine powder,α-Al 2 O 3 1 to 3 percent of micro powder, 8 to 12 percent of pure calcium aluminate cement, 3 to 5 percent of hexagonal boron nitride fine powder and 0.1 to 0.2 percent of water reducing agent.
2. A self-lubricating blind for a tundish according to claim 1,
the particle composition of the sintered tabular corundum aggregate is as follows by mass: 20 to 26 percent of the thickness of 5 to 3mm, 16 to 24 percent of the thickness of 3 to 1mm and 20 to 26 percent of the thickness of 1 to 0.1 mm.
3. A self-lubricating blind for a tundish according to claim 1,
the grain size of the sintered tabular corundum fine powder is less than or equal to 0.088mm.
4. A self-lubricating blind for a tundish according to claim 1,
the alpha-Al 2 O 3 The average particle diameter of the fine powder is 1 to 3 μm.
5. A self-lubricating blind for a tundish according to claim 1,
al in the pure calcium aluminate cement 2 O 3 The content is more than or equal to 70wt percent, and the average particle size is 3-14 mu m.
6. A self-lubricating blind for a tundish according to claim 1,
the h-BN content in the hexagonal boron nitride fine powder is more than or equal to 95wt%, and the average particle size of the hexagonal boron nitride fine powder is 3-45 mu m.
7. A self-lubricating blind for a tundish according to claim 1,
the water reducing agent is sodium hexametaphosphate, a polycarboxylate water reducing agent or a mixture of the sodium hexametaphosphate and the polycarboxylate water reducing agent.
8. A method for manufacturing a self-lubricating blind plate for a tundish according to any one of claims 1 to 7, comprising the following steps:
preparing sintered tabular corundum aggregate, sintered tabular corundum fine powder and alpha-Al 2 O 3 Mixing the micro powder, the pure calcium aluminate cement, the hexagonal boron nitride fine powder and the water reducing agent to prepare the castable;
adding 5.5-6.8% of water into the casting material, stirring uniformly, forming, curing for 2-3 days, demoulding, baking, and performing heat treatment at 800-1000 ℃ for 3-5 hours to finally obtain the finished product.
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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