CN110342949B - Crack-resistant castable for swinging spout and pouring process - Google Patents
Crack-resistant castable for swinging spout and pouring process Download PDFInfo
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- CN110342949B CN110342949B CN201910741597.8A CN201910741597A CN110342949B CN 110342949 B CN110342949 B CN 110342949B CN 201910741597 A CN201910741597 A CN 201910741597A CN 110342949 B CN110342949 B CN 110342949B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/14—Charging or discharging liquid or molten material
Abstract
The invention discloses an anti-crack castable for a swinging spout and a casting process, wherein the castable comprises the following components in parts by weight: 25-30 parts of alumina with the aluminum oxide content of more than 88%, 15-20 parts of brown fused alumina, 25-47 parts of silicon carbide and 5 parts of a binding agent; wherein the silicon carbide consists of 15-35 parts of silicon carbide with the granularity of 0-3 mu m and 10-12 parts of 325-mesh silicon carbide. The technical scheme improves the proportion of the silicon carbide in the whole casting material and improves the thermal vibration of the casting material to a certain extent; meanwhile, the specific granularity of the silicon carbide is selected, the silicon carbide with the proper granularity is selected, and the proportion of the silicon carbide with different granularities is controlled to further improve the thermal vibration performance and further prolong the service life of the castable.
Description
Technical Field
The invention relates to the field of molten steel pouring, in particular to an anti-crack pouring material for a swinging spout and a pouring process.
Background
The swinging spout device is used for collecting molten iron flowing out of the molten iron runner into a specified 140t molten iron tank car through switching and transition of the device.
The swing spout device comprises a swing spout, a swing frame beam, a transmission mechanism, a power device, a chute bracket and the like. The power device realizes the angular swing of the chute bracket through the transmission mechanism, thereby controlling the swing spout on the chute bracket.
The swinging spout is exposed in the air for use, so that the castable of the swinging spout is poor in thermal shock resistance, cracks are generated, and the service life of a product is influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the first purpose of the invention is to provide the crack-resistant castable for the swing spout, which is beneficial to prolonging the service life of the swing spout.
The technical purpose of the invention is realized by the following technical scheme:
an anti-crack castable for a swinging spout comprises the following components in parts by weight:
25-30 parts of alumina with aluminum oxide content of more than 88 percent
15-20 parts of brown corundum
25-47 parts of silicon carbide
5 parts of a binding agent;
wherein the silicon carbide consists of 15-35 parts of silicon carbide with the granularity of 0-3 mu m and 10-12 parts of 325-mesh silicon carbide.
Firstly, the proportion of silicon carbide in the whole castable is improved, and the thermal vibration of the castable is improved to a certain extent; meanwhile, the specific granularity of the silicon carbide is selected, the silicon carbide with the proper granularity is selected, and the proportion of the silicon carbide with different granularities is controlled to further improve the thermal vibration performance and further prolong the service life of the castable.
Further, the castable also comprises 0.5-1.5 parts of steel fiber.
The addition of the steel fiber can improve the expansion rate of the casting material, reduce the probability of cracks caused by inconsistent expansion of the casting material and the swing nozzle shell, and prolong the service life of the swing nozzle.
Furthermore, the bonding agent is aluminum dihydrogen phosphate.
The substances are combined through the aluminum dihydrogen phosphate, and the aluminum dihydrogen phosphate has stronger fluidity and better combination property.
Further, 15-20 parts of silicon carbide with the grain size of 0-3 mu m.
15-20 parts of silicon carbide with the grain size of 0-3 mu m and 10-12 parts of 325-mesh silicon carbide, wherein the ratio of the silicon carbide with the grain size of 0-3 mu m to the 325-mesh silicon carbide ranges from 1.25 to 2, and when the silicon carbide with the grain size of 0-3 mu m and the silicon carbide with the grain size of 325-mesh silicon carbide reach a certain value, the anti-cracking performance of the casting material is optimal.
The second purpose of the invention is to provide a pouring process of an anti-cracking castable for a swinging spout.
A pouring process of an anti-crack castable for a swing spout comprises the following steps of 1) cleaning a steel shell of the swing spout; step 2) adding water into the components, mixing and stirring to form a wet material; step 3) coating the wet material on a steel shell of a swinging spout to carry out natural drying and solidification for 12 hours; and 4) baking the swinging spout subjected to the step 3).
Further, the baking consisted of two stages, the first stage being baking with the oscillating lip placed at 200 ℃ and increasing to 500 ℃ at a rate of 20 ℃/min, leaving 5 minutes at 500 ℃: and the second stage is that the swinging spout at 500 ℃ is directly placed into an oven at 1000 ℃ and baked for 1 h.
The thermal shock of the swinging spout is tested on one hand and the baking speed is accelerated on the other hand by gradually baking at 200-500 ℃, stabilizing at 500 ℃ and then directly jumping from 500 ℃ to 1000 ℃ in an oven environment.
In conclusion, the invention has the following beneficial effects: 1) the anti-cracking performance of the castable is improved by increasing the proportion of the silicon carbide; 2) the anti-cracking performance of the castable is further improved by selecting the granularity of the silicon carbide and the proportion of the silicon carbide with different granularities; 3) the anti-cracking performance of the castable is further improved by increasing the steel fiber; 4) and the anti-cracking performance of the casting material is improved by selecting a proper bonding agent.
Detailed Description
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Example 1: the crack-resistant castable for the swing spout and the casting process comprise the following components in parts by weight: 25 portions of alumina with more than 88 percent of aluminum oxide content
15 portions of brown corundum
5 parts of a binding agent;
15 portions of silicon carbide with the granularity of 0 to 3 mu m and 10 portions of 325 meshes of silicon carbide, and the bonding agent is aluminum dihydrogen phosphate.
Example 2: the crack-resistant castable for the swing spout and the casting process comprise the following components in parts by weight: 30 portions of alumina with more than 88 percent of aluminum oxide content
20 portions of brown corundum
5 parts of a binding agent;
35 parts of silicon carbide with the granularity of 0-3 mu m and 12 parts of 325-mesh silicon carbide, and the bonding agent is aluminum dihydrogen phosphate.
Example 3: the crack-resistant castable for the swing spout and the casting process comprise the following components in parts by weight: 27 portions of alumina with more than 88 percent of aluminum oxide content
Brown corundum 17 portions
5 parts of a binding agent;
25 parts of silicon carbide with the granularity of 0-3 mu m and 11 parts of 325-mesh silicon carbide, and the bonding agent is aluminum dihydrogen phosphate.
Example 4: the crack-resistant castable for the swing spout and the casting process comprise the following components in parts by weight: 27 portions of alumina with more than 88 percent of aluminum oxide content
Brown corundum 17 portions
5 parts of a binding agent;
13 parts of silicon carbide with the granularity of 0-3 mu m and 11 parts of 325-mesh silicon carbide, and the bonding agent is aluminum dihydrogen phosphate.
Example 5: the crack-resistant castable for the swing spout and the casting process comprise the following components in parts by weight: 27 portions of alumina with more than 88 percent of aluminum oxide content
Brown corundum 17 portions
5 parts of a binding agent;
14 parts of silicon carbide with the granularity of 0-3 mu m and 11 parts of 325-mesh silicon carbide, and the bonding agent is aluminum dihydrogen phosphate.
Example 6: the crack-resistant castable for the swing spout and the casting process comprise the following components in parts by weight: 27 portions of alumina with more than 88 percent of aluminum oxide content
Brown corundum 17 portions
5 parts of a binding agent;
15 portions of silicon carbide with the granularity of 0 to 3 mu m and 11 portions of 325 meshes of silicon carbide, and the bonding agent is aluminum dihydrogen phosphate.
Example 7: the crack-resistant castable for the swing spout and the casting process comprise the following components in parts by weight: 27 portions of alumina with more than 88 percent of aluminum oxide content
Brown corundum 17 portions
5 parts of a binding agent;
16 parts of silicon carbide with the granularity of 0-3 mu m and 11 parts of 325-mesh silicon carbide, and the bonding agent is aluminum dihydrogen phosphate.
Example 8: the crack-resistant castable for the swing spout and the casting process comprise the following components in parts by weight: 27 portions of alumina with more than 88 percent of aluminum oxide content
Brown corundum 17 portions
5 parts of a binding agent;
17 parts of silicon carbide with the granularity of 0-3 mu m and 11 parts of 325-mesh silicon carbide, and the bonding agent is aluminum dihydrogen phosphate.
Example 9: the crack-resistant castable for the swing spout and the casting process comprise the following components in parts by weight: 27 portions of alumina with more than 88 percent of aluminum oxide content
Brown corundum 17 portions
5 parts of a binding agent;
18 portions of silicon carbide with the granularity of 0 to 3 mu m and 11 portions of 325 meshes of silicon carbide, and the bonding agent is aluminum dihydrogen phosphate.
Example 10: the crack-resistant castable for the swing spout and the casting process comprise the following components in parts by weight: 27 portions of alumina with more than 88 percent of aluminum oxide content
Brown corundum 17 portions
5 parts of a binding agent;
19 parts of silicon carbide with the granularity of 0-3 mu m and 11 parts of 325-mesh silicon carbide, and the bonding agent is aluminum dihydrogen phosphate.
Example 11: the crack-resistant castable for the swing spout and the casting process comprise the following components in parts by weight: 27 portions of alumina with more than 88 percent of aluminum oxide content
Brown corundum 17 portions
5 parts of a binding agent;
20 portions of silicon carbide with the granularity of 0 to 3 mu m and 11 portions of 325 meshes of silicon carbide, and the bonding agent is aluminum dihydrogen phosphate.
Example 12: the crack-resistant castable for the swing spout and the casting process comprise the following components in parts by weight: 27 portions of alumina with more than 88 percent of aluminum oxide content
Brown corundum 17 portions
5 parts of a binding agent;
21 parts of silicon carbide with the granularity of 0-3 mu m and 11 parts of 325-mesh silicon carbide, and the bonding agent is aluminum dihydrogen phosphate.
Example 13: the crack-resistant castable for the swing spout and the casting process comprise the following components in parts by weight: 27 portions of alumina with more than 88 percent of aluminum oxide content
Brown corundum 17 portions
5 parts of a binding agent;
22 parts of silicon carbide with the granularity of 0-3 mu m and 11 parts of 325-mesh silicon carbide, and the bonding agent is aluminum dihydrogen phosphate.
Example 14: the crack-resistant castable for the swing spout and the casting process comprise the following components in parts by weight: 25 portions of alumina with more than 88 percent of aluminum oxide content
15 portions of brown corundum
Steel fiber 1 part
5 parts of a binding agent;
15 portions of silicon carbide with the granularity of 0 to 3 mu m and 10 portions of 325 meshes of silicon carbide, and the bonding agent is aluminum dihydrogen phosphate.
Example 15: the crack-resistant castable for the swing spout and the casting process comprise the following components in parts by weight: 30 portions of alumina with more than 88 percent of aluminum oxide content
20 portions of brown corundum
Steel fiber 1 part
5 parts of a binding agent;
35 parts of silicon carbide with the granularity of 0-3 mu m and 12 parts of 325-mesh silicon carbide, and the bonding agent is aluminum dihydrogen phosphate.
Example 16: the crack-resistant castable for the swing spout and the casting process comprise the following components in parts by weight: 27 portions of alumina with more than 88 percent of aluminum oxide content
Brown corundum 17 portions
Steel fiber 1 part
5 parts of a binding agent;
25 parts of silicon carbide with the granularity of 0-3 mu m and 11 parts of 325-mesh silicon carbide, and the bonding agent is aluminum dihydrogen phosphate.
Example 17: the crack-resistant castable for the swing spout and the casting process comprise the following components in parts by weight: 27 portions of alumina with more than 88 percent of aluminum oxide content
Brown corundum 17 portions
Steel fiber 1 part
5 parts of a binding agent;
13 parts of silicon carbide with the granularity of 0-3 mu m and 11 parts of 325-mesh silicon carbide, and the bonding agent is aluminum dihydrogen phosphate.
Example 18: the crack-resistant castable for the swing spout and the casting process comprise the following components in parts by weight: 27 portions of alumina with more than 88 percent of aluminum oxide content
Brown corundum 17 portions
Steel fiber 1 part
5 parts of a binding agent;
14 parts of silicon carbide with the granularity of 0-3 mu m and 11 parts of 325-mesh silicon carbide, and the bonding agent is aluminum dihydrogen phosphate.
Example 19: the crack-resistant castable for the swing spout and the casting process comprise the following components in parts by weight: 27 portions of alumina with more than 88 percent of aluminum oxide content
Brown corundum 17 portions
Steel fiber 1 part
5 parts of a binding agent;
15 portions of silicon carbide with the granularity of 0 to 3 mu m and 11 portions of 325 meshes of silicon carbide, and the bonding agent is aluminum dihydrogen phosphate.
Example 20: the crack-resistant castable for the swing spout and the casting process comprise the following components in parts by weight: 27 portions of alumina with more than 88 percent of aluminum oxide content
Brown corundum 17 portions
Steel fiber 1 part
5 parts of a binding agent;
16 parts of silicon carbide with the granularity of 0-3 mu m and 11 parts of 325-mesh silicon carbide, and the bonding agent is aluminum dihydrogen phosphate.
Example 21: the crack-resistant castable for the swing spout and the casting process comprise the following components in parts by weight: 27 portions of alumina with more than 88 percent of aluminum oxide content
Brown corundum 17 portions
Steel fiber 1 part
5 parts of a binding agent;
17 parts of silicon carbide with the granularity of 0-3 mu m and 11 parts of 325-mesh silicon carbide, and the bonding agent is aluminum dihydrogen phosphate.
Example 22: the crack-resistant castable for the swing spout and the casting process comprise the following components in parts by weight: 27 portions of alumina with more than 88 percent of aluminum oxide content
Brown corundum 17 portions
Steel fiber 1 part
5 parts of a binding agent;
18 portions of silicon carbide with the granularity of 0 to 3 mu m and 11 portions of 325 meshes of silicon carbide, and the bonding agent is aluminum dihydrogen phosphate.
Example 23: the crack-resistant castable for the swing spout and the casting process comprise the following components in parts by weight: 27 portions of alumina with more than 88 percent of aluminum oxide content
Brown corundum 17 portions
Steel fiber 1 part
5 parts of a binding agent;
19 parts of silicon carbide with the granularity of 0-3 mu m and 11 parts of 325-mesh silicon carbide, and the bonding agent is aluminum dihydrogen phosphate.
Example 24: the crack-resistant castable for the swing spout and the casting process comprise the following components in parts by weight: 27 portions of alumina with more than 88 percent of aluminum oxide content
Brown corundum 17 portions
Steel fiber 1 part
5 parts of a binding agent;
20 portions of silicon carbide with the granularity of 0 to 3 mu m and 11 portions of 325 meshes of silicon carbide, and the bonding agent is aluminum dihydrogen phosphate.
Example 25: the crack-resistant castable for the swing spout and the casting process comprise the following components in parts by weight: 27 portions of alumina with more than 88 percent of aluminum oxide content
Brown corundum 17 portions
Steel fiber 1 part
5 parts of a binding agent;
21 parts of silicon carbide with the granularity of 0-3 mu m and 11 parts of 325-mesh silicon carbide, and the bonding agent is aluminum dihydrogen phosphate.
Example 26: the crack-resistant castable for the swing spout and the casting process comprise the following components in parts by weight: 27 portions of alumina with more than 88 percent of aluminum oxide content
Brown corundum 17 portions
Steel fiber 1 part
5 parts of a binding agent;
22 parts of silicon carbide with the granularity of 0-3 mu m and 11 parts of 325-mesh silicon carbide, and the bonding agent is aluminum dihydrogen phosphate.
Comparative example 1: the difference from example 16 is that: 325 mesh silicon carbide is replaced by 325 mesh silicon micropowder.
Comparative example 2: the difference from example 16 is that: the silicon carbide consists only of 36 parts of silicon carbide with a particle size of 0-3 μm.
Comparative example 3: the difference from example 16 is that: the silicon carbide consists of only 36 parts of silicon carbide with a particle size of 325 mesh.
Comparative example 4: the difference from example 16 is that: the silicon carbide consists of 25 parts of silicon carbide with the grain size of 3-5 mu m and 11 parts of 325-mesh silicon carbide.
Comparative example 5: the difference from example 16 is that: the silicon carbide consists of 25 parts of silicon carbide with the grain size of 5-7 mu m and 11 parts of 325-mesh silicon carbide.
Comparative example 6: the difference from example 16 is that: the silicon carbide consists of 25 parts of silicon carbide with the grain size of 7-10 mu m and 11 parts of 325-mesh silicon carbide.
Comparative example 7: the difference from example 16 is that: the silicon carbide consists of 25 parts of silicon carbide with the grain size of 10-13 mu m and 11 parts of 325-mesh silicon carbide.
Comparative example 8: the difference from example 16 is that: the silicon carbide consists of 25 parts of silicon carbide with the grain size of 13-16 mu m and 11 parts of 325-mesh silicon carbide.
Comparative example 9: the difference from example 16 is that: the silicon carbide consisted of 25 parts silicon carbide with a particle size of 0-3 μm and 11 parts 270 mesh (53 micron) silicon carbide.
Comparative example 10: the difference from example 16 is that: the silicon carbide consisted of 25 parts of silicon carbide with a particle size of 0-3 μm and 11 parts of 230 mesh (61 micron) silicon carbide.
Comparative example 11: the difference from example 16 is that: the silicon carbide consists of 25 parts of silicon carbide with a particle size of 0-3 μm and 11 parts of 400 mesh (38 microns) silicon carbide.
Comparative example 12: the difference from example 16 is that: the silicon carbide consisted of 25 parts of silicon carbide with a particle size of 0-3 μm and 11 parts of 460 mesh (30 microns) silicon carbide.
Comparative example 13: the difference from example 16 is that: the silicon carbide consisted of 25 parts of silicon carbide with a particle size of 0-3 μm and 11 parts of 540 mesh (26 microns) silicon carbide.
Comparative example 14: the difference from example 16 is that: the silicon carbide consisted of 25 parts of silicon carbide with a particle size of 7-10 μm and 11 parts of 400 mesh (38 microns) silicon carbide.
Comparative example 15: the difference from example 16 is that: the silicon carbide consisted of 25 parts of silicon carbide with a particle size of 7-10 μm and 11 parts of 460 mesh (30 microns) silicon carbide.
Comparative example 16: the difference from example 16 is that: the silicon carbide consisted of 25 parts of silicon carbide with a particle size of 5-7 μm and 11 parts of 540 mesh (26 microns) silicon carbide.
Specifically, the following description is provided: 325 mesh is 44 microns.
And (3) testing: the above examples and comparative examples were each prepared as follows. Step 1) cleaning a steel shell of a swinging spout; step 2) adding water into the components, mixing and stirring to form a wet material; step 3) coating the wet material on a steel shell of a swinging spout to carry out natural drying and solidification for 12 hours; and 4) baking the swinging spout subjected to the step 3). The baking consisted of two stages, the first being baking with a swinging spout placed at 200 ℃ and ramped up to 500 ℃ at a rate of 20 ℃/min, 5 minutes dwell at 500 ℃: and the second stage is that the swinging spout at 500 ℃ is directly placed into an oven at 1000 ℃ and baked for 1 h.
And testing the service life times of the swing spout.
The comparative examples 2 to 12 and the example 16 show that the grain size selection of the silicon carbide is more critical to the selection of the crack resistance of the casting material, and the effect is best by adopting 0-3 mu m silicon carbide and 325 meshes of silicon carbide.
Comparing examples 1-13 and examples 14-26, it is demonstrated that the addition of steel fibers helps to improve the crack resistance of the castable.
It can be seen from comparison of examples 1 to 13 that the selection of the specific amounts of 0 to 3 μm silicon carbide and 325 mesh silicon carbide, and the control of the ratio of the two, have an effect on the crack resistance of the castable.
Claims (5)
1. The crack-resistant castable for the swing spout is characterized by comprising the following components in parts by weight:
25-30 parts of alumina with the aluminum oxide content of more than 88%;
15-20 parts of brown corundum;
25-47 parts of silicon carbide;
5 parts of a binding agent;
0.5-1.5 parts of steel fiber;
wherein the silicon carbide consists of 15-35 parts of silicon carbide with the granularity of 0-3 mu m and 10-12 parts of 325-mesh silicon carbide.
2. The crack-resistant castable for the swing spout according to claim 1, characterized in that: the bonding agent is aluminum dihydrogen phosphate.
3. The crack-resistant castable for the swing spout according to claim 1, characterized in that: 15-20 parts of silicon carbide with the granularity of 0-3 mu m.
4. A casting process of an anti-crack castable for a swing nozzle as claimed in any one of claims 1 to 3, characterized by comprising the steps of 1) cleaning a steel shell of the swing nozzle; step 2) adding water into the components, mixing and stirring to form a wet material; step 3) coating the wet material on a steel shell of a swinging spout to carry out natural drying and solidification for 12 hours; and 4) baking the swinging spout subjected to the step 3).
5. The pouring process of the crack-resistant castable for the swing spout according to claim 4, characterized in that: the baking consisted of two stages, the first being baking with a swinging spout placed at 200 ℃ and ramped up to 500 ℃ at a rate of 20 ℃/min, 5 minutes dwell at 500 ℃: and the second stage is that the swinging spout at 500 ℃ is directly placed into an oven at 1000 ℃ and baked for 1 h.
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| CN106587958A (en) * | 2016-12-14 | 2017-04-26 | 巩义市科正冶金材料有限公司 | Cement-free iron trough castable for blast-furnace tapping and preparation method of cement-free iron trough castable |
| CN107235734A (en) * | 2017-06-06 | 2017-10-10 | 浙江德清炜烨新材料有限公司 | A kind of aluminium silicon carbide matter castable |
| CN109721342A (en) * | 2019-02-22 | 2019-05-07 | 江苏江能新材料科技有限公司 | A kind of tapping pouring refractories and preparation method thereof |
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