CN116023160A - Fiber reinforced magnesia dry material for tundish - Google Patents
Fiber reinforced magnesia dry material for tundish Download PDFInfo
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- CN116023160A CN116023160A CN202211646686.2A CN202211646686A CN116023160A CN 116023160 A CN116023160 A CN 116023160A CN 202211646686 A CN202211646686 A CN 202211646686A CN 116023160 A CN116023160 A CN 116023160A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a fiber reinforced magnesia dry material for a tundish. Belongs to the application field of refractory materials; comprises magnesia, resin powder, carbon powder, boron glass powder and fiber; the granularity and mass percent are as follows: magnesia with granularity of 0.1-5 mm: 60-75%; magnesite with granularity smaller than 0.074 mm: 20-40%; resin powder: 3-6%; carbon powder: 0-3%; 1-5% of boron glass powder; the fiber accounts for 0.05 to 0.3 percent of the total mass of the raw materials. The invention introduces fibrous substances with high softening point, forms in-situ scattered liquid phase at high temperature, promotes micro-sintering of the material, is beneficial to uniformity and compactness of microstructure of the material, and improves strength and high-temperature service performance of the material; in addition, the invention introduces a large amount of flowable liquid phase and scattered liquid phase existing in situ in the dry material by the boron glass powder and the fiber respectively, which is fully beneficial to medium-high temperature sintering of the material, relieves the problem that the pure phenolic resin powder is combined with the dry material and has no strength or too low strength at medium temperature, and reduces the tendency that the dry material is easy to introduce magnesia inclusion into molten steel due to poor flushing resistance.
Description
Technical Field
The invention relates to the field of refractory material application, and relates to a fiber reinforced magnesia dry material for a tundish.
Background
The tundish dry material can be gradually formed into gradient materials with different sintering degrees in the high-temperature use process, and a high-temperature material with a relatively compact structure is formed at the hot surface contacted with molten steel, so that the high-temperature use of the material and the corrosion resistance of molten steel/slag are facilitated. The sintering degree at the cold face is lower, the structure is relatively loose, the lining material and the permanent layer can be prevented from being excessively bonded, and the package is convenient to turn over after being used. However, dry materials are heterogeneous bulk materials, and vibration construction processes may exacerbate the non-uniformity of local composition and structure; and in the high-temperature process, as the smelting time is prolonged, the use effect of the dry material is affected by the difference of the material components and the structure uniformity at different parts of the hot surface, if the partial structure is loose due to underfiring, molten steel/slag erosion and too fast penetration are caused, and if the magnesium material is excessively burnt, cracks are formed, the thermal shock resistance is reduced, and the tundish is rapidly taken off line and stopped under both conditions.
In order to improve the microstructure of the hot surface of the tundish dry material and prevent the occurrence of local overburning or underfiring phenomenon at the hot surface, a material with uniform structure and sintering consistency at high temperature is obtained, and the high-temperature service performance of the dry material is improved; meanwhile, the material at the cold surface still keeps better non-sintering property under the medium and low temperature condition, and a magnesia dry material with more excellent comprehensive structural performance needs to be developed.
Disclosure of Invention
The invention aims to: the invention aims to provide a fiber reinforced magnesia dry material for a tundish.
The technical scheme is as follows: the invention relates to a fiber reinforced magnesia dry material for a tundish, which comprises magnesia, resin powder, carbon powder, boron glass powder and fibers;
the granularity and mass percent of each material are as follows: magnesia with granularity of 0.1-5 mm: 60-75%; magnesite with granularity smaller than 0.074 mm: 20-40%; resin powder: 3-6%; carbon powder: 0-3%; 1-5% of boron glass powder; the total weight of the raw materials is 100 percent;
wherein, the fiber accounts for 0.05 to 0.3 percent of the total mass of the raw materials.
Further, the magnesia is any one of sintered magnesia or fused magnesia, wherein: mgO is more than or equal to 93 percent.
Further, the resin powder is any one of thermosetting phenolic resin powder, the softening point of the resin powder is between 90 and 120 ℃, and the granularity D of the resin powder is between 90 and 120 DEG C 0.9 ≤0.044mm。
Further, the carbon powder is any one of graphite and carbon black, and the granularity D of the carbon powder 0.9 Less than or equal to 0.15mm, and the fixed carbon is more than or equal to 90 percent.
Further, the boron glass powder is any one of sodium-based boron glass powder, wherein the melting point is 800-1200 ℃, and D 0.9 ≤0.045mm，50％≥SiO 2 ≥40％,B 2 O 3 ≥25％,Na 2 O≥10％。
Further, the fiber contains SiO 2 Any one of the fibrous materials of the component, wherein SiO 2 More than or equal to 10 percent; the diameter is 9-12um; the length is 1-10mm; the initial softening point is more than or equal to 1000 ℃; the volume density is more than or equal to 2.8 g.cm -3 。
The beneficial effects are that: compared with the prior art, the invention has the characteristics that: 1. the invention introduces fibrous substances with high softening point, forms in-situ scattered liquid phase at high temperature, promotes micro-sintering of the material, is beneficial to uniformity and compactness of microstructure of the material, and improves strength and high-temperature service performance of the material; 2. according to the invention, a large amount of flowable liquid phase and scattered liquid phase existing in situ are respectively introduced into the dry material by the boron glass powder and the fiber, so that the medium-high temperature sintering of the material is fully facilitated, the problem that the medium temperature of the pure phenolic resin powder combined dry material is not strong or is too low in strength is solved, and the tendency that the dry material is easy to introduce magnesium inclusion into molten steel due to poor flushing resistance is alleviated.
Detailed Description
The invention is further illustrated below with reference to examples.
The invention relates to a fiber reinforced magnesia dry material for a tundish, which consists of magnesia, resin powder, carbon powder, borax and fibers; the granularity and mass percentage are as follows: 60-75% of magnesite with granularity of 0.1-5 mm; 20-40% of magnesite with granularity smaller than 0.074 mm; 3-6% of resin powder; graphite, 0-3%; 1-5% of boron glass powder; the total weight of the raw materials is 100 percent. Wherein the fiber accounts for 0.05-0.3% of the total mass of the raw materials.
The magnesia is any one of sintered magnesia or fused magnesia, wherein MgO is more than or equal to 93 percent.
The resin powder is any one of thermosetting phenolic resin powder, the softening point of the resin powder is between 90 and 120 ℃, and the granularity D 0.9 ≤0.044mm。
The carbon powder is any one of graphite and carbon black, and has granularity D 0.9 Less than or equal to 0.15mm, and the fixed carbon is more than or equal to 90 percent.
The boron glass powder is any one of sodium-based boron glass powder, wherein the melting point is between 800 and 1200 ℃, D 0.9 ≤0.045mm，50％≥SiO 2 ≥40％,B 2 O 3 ≥25％,Na 2 O≥10％。
The fiber contains SiO 2 Any one of the fibrous materials of the component, wherein SiO 2 More than or equal to 10 percent; the diameter is 9-12um; the length is 1-10mm; the initial softening point is more than or equal to 1000 ℃; the volume density is more than or equal to 2.8 g.cm -3 。
Examples
All the fine powder is premixed in a ball milling tank for 30 minutes, dry-mixed with the rest particles, fibers and the like for 15 minutes, rammed in a triple die for molding, baked at 200 ℃, and then demoulded, and then heat-treated at 1000 ℃/1500 ℃ respectively, wherein the physicochemical indexes are shown in table 1.
Table 1 performance index of example dry materials
Example 1:
the total weight of the raw materials is 100 percent;
aluminium silicon fibre (SiO) 2 20 percent of content) is added with 0.1 percent of additive, the length is 5mm, and the softening point is more than 1150 ℃.
Example 2:
the total weight of the raw materials is 100 percent;
mullite fiber (SiO) 2 15% of the content) is added with 0.30%, the length is 5mm, and the softening point is more than 1200 ℃.
Example 3:
the total weight of the raw materials is 100 percent;
aluminum Silicate (SiO) 2 30% of fiber, 0.05% of fiber, 5mm in length and softening point greater than 1030 ℃.
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 examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the invention without departing from the principles thereof are intended to be within the scope of the invention as set forth in the following claims.
Claims (6)
1. The fiber reinforced magnesia dry material for the tundish is characterized by comprising magnesia, resin powder, carbon powder, boron glass powder and fibers;
the granularity and mass percent of each material are as follows: magnesia with granularity of 0.1-5 mm: 60-75%; magnesite with granularity smaller than 0.074 mm: 20-40%; resin powder: 3-6%; carbon powder: 0-3%; 1-5% of boron glass powder; the total weight of the raw materials is 100 percent;
wherein, the fiber accounts for 0.05 to 0.3 percent of the total mass of the raw materials.
2. A dry material of magnesium reinforced with fibers for tundish according to claim 1,
the magnesia is any one of sintered magnesia or fused magnesia, wherein: mgO is more than or equal to 93 percent.
3. A dry material of magnesium reinforced with fibers for tundish according to claim 1,
the resin powder is any one of thermosetting phenolic resin powder, the softening point of the resin powder is between 90 and 120 ℃, and the granularity D 0.9 ≤0.044mm。
4. A dry material of magnesium reinforced with fibers for tundish according to claim 1,
the carbon powder is any one of graphite and carbon black, and has granularity D 0.9 Less than or equal to 0.15mm, and the fixed carbon is more than or equal to 90 percent.
5. A dry material of magnesium reinforced with fibers for tundish according to claim 1,
the boron glass powder is any one of sodium-based boron glass powder, wherein the melting point is between 800 and 1200 ℃, D 0.9 ≤0.045mm，50％≥SiO 2 ≥40％,B 2 O 3 ≥25％,Na 2 O≥10％。
6. A dry material of magnesium reinforced with fibers for tundish according to claim 1,
the fiber contains SiO 2 Any one of the fibrous materials of the component, wherein SiO 2 More than or equal to 10 percent; the diameter is 9-12um; the length is 1-10mm; the initial softening point is more than or equal to 1000 ℃;the volume density is more than or equal to 2.8 g.cm -3 。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211646686.2A CN116023160A (en) | 2022-12-21 | 2022-12-21 | Fiber reinforced magnesia dry material for tundish |
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| CN202211646686.2A CN116023160A (en) | 2022-12-21 | 2022-12-21 | Fiber reinforced magnesia dry material for tundish |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5718757A (en) * | 1995-12-08 | 1998-02-17 | Rhone-Poulenc Chimie | Binding phase for phosphomagnesium cements and their use for the preparation of mortars |
| CN107010988A (en) * | 2017-04-27 | 2017-08-04 | 濮阳濮耐高温材料（集团）股份有限公司 | A kind of dry working lining of anti-swelling cracking and preparation method thereof |
| CN114380577A (en) * | 2022-03-24 | 2022-04-22 | 北京利尔高温材料股份有限公司 | Low-silicon tundish dry material for high-quality steel |
| CN114409381A (en) * | 2022-03-28 | 2022-04-29 | 北京利尔高温材料股份有限公司 | Tundish dry material and preparation method thereof |
| CN115010468A (en) * | 2021-07-12 | 2022-09-06 | 张家港市恒乐阳方高温材料有限公司 | Environment-friendly tundish dry material and preparation method thereof |
| CN115322000A (en) * | 2022-09-13 | 2022-11-11 | 中钢集团洛阳耐火材料研究院有限公司 | Magnesium-calcium tundish dry material and preparation method thereof |
| CN115321957A (en) * | 2022-09-13 | 2022-11-11 | 中钢集团洛阳耐火材料研究院有限公司 | Tundish lining material for smelting quality steel and preparation method |
| CN115417661A (en) * | 2022-08-18 | 2022-12-02 | 武汉钢铁有限公司 | Tundish dry material, tundish working lining and preparation method thereof |
-
2022
- 2022-12-21 CN CN202211646686.2A patent/CN116023160A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5718757A (en) * | 1995-12-08 | 1998-02-17 | Rhone-Poulenc Chimie | Binding phase for phosphomagnesium cements and their use for the preparation of mortars |
| CN107010988A (en) * | 2017-04-27 | 2017-08-04 | 濮阳濮耐高温材料（集团）股份有限公司 | A kind of dry working lining of anti-swelling cracking and preparation method thereof |
| CN115010468A (en) * | 2021-07-12 | 2022-09-06 | 张家港市恒乐阳方高温材料有限公司 | Environment-friendly tundish dry material and preparation method thereof |
| CN114380577A (en) * | 2022-03-24 | 2022-04-22 | 北京利尔高温材料股份有限公司 | Low-silicon tundish dry material for high-quality steel |
| CN114409381A (en) * | 2022-03-28 | 2022-04-29 | 北京利尔高温材料股份有限公司 | Tundish dry material and preparation method thereof |
| CN115417661A (en) * | 2022-08-18 | 2022-12-02 | 武汉钢铁有限公司 | Tundish dry material, tundish working lining and preparation method thereof |
| CN115322000A (en) * | 2022-09-13 | 2022-11-11 | 中钢集团洛阳耐火材料研究院有限公司 | Magnesium-calcium tundish dry material and preparation method thereof |
| CN115321957A (en) * | 2022-09-13 | 2022-11-11 | 中钢集团洛阳耐火材料研究院有限公司 | Tundish lining material for smelting quality steel and preparation method |
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