CN111673049A - Fiber heat-insulating riser material for casting - Google Patents
Fiber heat-insulating riser material for casting Download PDFInfo
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- CN111673049A CN111673049A CN202010474407.3A CN202010474407A CN111673049A CN 111673049 A CN111673049 A CN 111673049A CN 202010474407 A CN202010474407 A CN 202010474407A CN 111673049 A CN111673049 A CN 111673049A
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- parts
- casting
- riser
- fiber
- oxide
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/088—Feeder heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
- B22C1/181—Cements, oxides or clays
Abstract
The invention belongs to the technical field of heat-insulating risers, and particularly relates to a fiber heat-insulating riser material for casting, which comprises the following components in parts by weight: 60-80 parts of aluminum silicate fiber, 20-35 parts of calcium oxide-containing magnesium oxychloride cement, 5-10 parts of silica micropowder, 1-3 parts of ferric oxide and 2-5 parts of carbon powder. According to the fiber heat-insulation riser material for casting, disclosed by the invention, on the basis of an aluminum silicate fiber heat-insulation riser material which takes silicon micro powder as a refractory filler and magnesium oxychloride cement as a binding agent, ferric oxide and carbon powder are added to construct a riser covering agent, namely the riser covering agent which takes silicon micro powder, aluminum oxide in aluminum silicate fiber, ferric oxide, calcium oxide in magnesium oxychloride cement, magnesium oxide and carbon powder as a combination has double functions of heating and heat insulation, the riser feeding effect is improved, the compactness of a riser structure is improved, and the riser material is high in compressive strength and good in fire resistance.
Description
Technical Field
The invention belongs to the technical field of heat-insulating risers, and particularly relates to a fiber heat-insulating riser material for casting.
Background
In casting, shrinkage cavities and porosity are formed after the part of the casting is solidified, because the casting is cooled for a long time during casting, and a metal part in a casting mold shrinks, but not enough molten metal is used for feeding. The generated shrinkage cavity and shrinkage porosity seriously affect the compactness of the casting, thereby causing the quality of the casting to be low.
In the existing riser material, molten metal in a riser and molten metal in a casting are simultaneously solidified in the casting process, the molten metal for feeding in the riser only accounts for 10-14% of the total molten metal in the riser, the utilization efficiency is low, and the feeding effect is poor. In order to improve the yield of castings, the size of a riser can only be increased, and molten metal in the riser is increased, so that resources are wasted, and the cost is increased.
The fiber heat-insulating riser material has the advantages of good heat-insulating property, light weight and the like, and is more and more widely applied. However, the pure ceramic fiber insulating riser material has low strength and refractoriness, cannot resist the high-temperature erosion of molten steel, and is not suitable to be used as an insulating riser independently. In order to improve the refractoriness of the fiber insulating riser material, refractory fillers, such as: quartz sand, bauxite, and the like. The larger the addition amount of the refractory filler is, the higher the strength and refractoriness of the insulated riser are, and the better the surface quality of the cast riser is. However, as the addition amount of the refractory filler is increased, the heat insulating effect of the fiber heat insulating riser material tends to be reduced, and even the heat insulating effect is lost.
Disclosure of Invention
Based on the above-mentioned disadvantages and shortcomings of the prior art, it is an object of the present invention to at least solve one or more of the above-mentioned problems of the prior art, in other words, to provide a fiber insulating feeder material for casting which satisfies one or more of the above-mentioned requirements.
In order to achieve the purpose, the invention adopts the following technical scheme:
the fiber heat-insulating riser material for casting comprises the following components in parts by weight:
60-80 parts of aluminum silicate fiber, 20-35 parts of calcium oxide-containing magnesium oxychloride cement, 5-10 parts of silica micropowder, 1-3 parts of ferric oxide and 2-5 parts of carbon powder.
Preferably, the riser material further comprises the following components in parts by weight: 1-2 parts of metal silicon powder and 2-4 parts of copper oxide.
Preferably, the molar ratio of Si/Cu in the metal silicon powder and the copper oxide is 1: 1.
preferably, the riser material further comprises the following components in parts by weight: 0.5-1 part of zirconium oxide.
Preferably, the riser material comprises the following components in parts by weight: 60 parts of aluminum silicate fiber, 30 parts of magnesium oxychloride cement containing calcium oxide, 10 parts of silicon micropowder, 2 parts of ferric oxide and 4 parts of carbon powder.
Preferably, the magnesium oxychloride cement is formed by stirring light-burned magnesium and magnesium chloride in an aqueous solution uniformly into a slurry.
As a preferable scheme, MgO/MgCl is contained in the magnesium oxychloride cement2The molar ratio of (A) to (B) is 8 to 10.
As a preferable scheme, the solid content of the magnesium oxychloride cement is 65-75%.
Preferably, the light burned magnesium adopts magnesite, and the fineness of the light burned magnesium is larger than 100 meshes; magnesite contains calcium oxide.
Preferably, the fineness of the silicon micropowder is more than 200 meshes.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the fiber heat-insulation riser material for casting, disclosed by the invention, on the basis of an aluminum silicate fiber heat-insulation riser material which takes silicon micro powder as a refractory filler and magnesium oxychloride cement as a binding agent, ferric oxide and carbon powder are added to construct a riser covering agent, namely the riser covering agent which takes silicon micro powder, aluminum oxide in aluminum silicate fiber, ferric oxide, calcium oxide in magnesium oxychloride cement, magnesium oxide and carbon powder as a combination has double functions of heating and heat insulation, the riser feeding effect is improved, the compactness of a riser structure is improved, and the riser material is high in compressive strength and good in fire resistance.
(2) According to the invention, the heating material is constructed by adding the metal silicon powder and the copper oxide; wherein, the metal silicon powder is used as a heating agent, and the copper oxide is used as an oxidant; the exothermic material and the riser covering agent are used together, so that the feeding effect of the riser is further improved; the exothermic material in the riser reacts at high temperature to release heat, and the heat insulation material plays a role in heat insulation, so that heat loss of molten metal is reduced, the solidification time of the molten metal in the riser is delayed, long-time feeding of a casting is realized, and the compactness of a casting tissue structure is improved.
(3) The addition of the zirconium oxide further improves the fire resistance of the riser material, and ensures that a smooth surface is obtained after the riser is fully contacted with molten metal.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1:
the fiber thermal insulation feeder head material for casting of the embodiment comprises the following components in parts by weight:
60 parts of aluminum silicate fiber, 30 parts of magnesium oxychloride cement containing calcium oxide, 10 parts of silicon micropowder, 2 parts of ferric oxide and 4 parts of carbon powder.
Wherein, the magnesium oxychloride cement containing calcium oxide, commonly known as Sorel cement, has good fireproof performance and small heat conductivity coefficient, and the main raw materials are light-burned magnesium and magnesium chloride which form MgO-MgCl in aqueous solution2-H2And (4) an O ternary reaction system. The main product has four crystal phases: 2 MgO. MgCl2·8H2O、3MgO·MgCl2·8H2O、5MgO·MgCl2·8H2O and 9 MgO. MgCl2·8H2O。
The magnesite used for light burning in the embodiment is made of magnesite, and a 120-mesh sieve is used for sieving (not limited to 120 meshes, as long as the fineness of the magnesite is larger than 100 meshes). Wherein, the main chemical components of the magnesia are as follows: the MgO content is 79 percent, and the calcium oxide content is 3 percent.
Magnesium chloride is dissolved in water to prepare supersaturated MgCl2The solution is added with light-burned magnesium and then stirred evenly into slurry, and the magnesium oxychloride cement containing calcium oxide is prepared, wherein the solid content is 65% -75%, and the proportion is based on the solid content of 65% in the embodiment. Wherein, MgO/MgCl2The molar ratio of (A) is 8-10, which is higher than that of MgO/MgCl of the existing common magnesium oxychloride cement2The molar ratio of (a) to (b) is 4-6, because the excessive part of magnesium oxide needs to participate in the construction of the feeder head covering agent. MgO/MgCl of this example2Is 10.
The silica powder of this example was sieved out of a 250 mesh sieve. In addition, the fine silica powder is not limited to use with a 250 mesh sieve as long as the fineness is greater than 200 mesh.
The samples of the casting fiber insulating riser material of the present example were prepared as follows:
adding water into aluminum silicate fibers, and processing the aluminum silicate fibers into short fiber paste with the diameter of 2-5 mm by a colloid mill;
adding the other components except the chlorine oxygen magnesium cement slurry, and placing the mixture into a stirrer to be mixed into slurry:
adding magnesium oxychloride cement slurry containing calcium oxide, and continuously stirring to obtain a pug;
then, the mixture was poured into a flat sample mold of 180mm × 20mm in diameter for thermal conductivity test and into a cylindrical sample wood mold of 30mm × 30mm in diameter for compressive strength test, and after leaving for 48 hours, the mold was removed, and the product was placed in an oven and dried at 150 ℃ for 3 hours to be finally molded, thereby obtaining the sample of example 1.
The formulations of the fiber insulating riser materials of other examples and comparative examples are summarized as shown in table 1.
TABLE 1 recipe table of fiber insulating riser material of each example and comparative example
The method for manufacturing the sample of the fiber insulation feeder material in the above embodiment can refer to embodiment 1, and is not described herein again.
The thermal conductivity, refractoriness, and compressive strength of the fiber insulating riser material samples of the above examples and comparative examples were measured, and the measurement results are shown in table 2.
TABLE 2 Performance Table of the test pieces of the fiber insulating riser material of each example and comparative example
On the basis of the component ratios of the fiber insulating riser material of example 1, the influence of different molar ratios of silicon metal and copper oxide on the performance of the fiber insulating riser material was examined, and the specific results are shown in table 3.
TABLE 3 influence of different molar ratios of silicon metal to copper oxide on the performance of the fiber insulated feeder material
As can be seen from table 3, the molar ratio of Si/Cu in the metal silicon powder and copper oxide is 1: 1, the overall performance of the fiber insulation riser material is relatively optimal.
In view of the numerous embodiments of the present invention, the experimental data of each embodiment is huge and is not suitable for being listed and explained herein one by one, but the contents to be verified and the final conclusions obtained by each embodiment are close. Therefore, the contents of the verification of each example are not described herein one by one, and only examples 1 to 9 are used as representatives to describe the excellent points of the present invention. The content of each component can be freely selected within the range of the content of the corresponding component, which is not listed here.
The fiber heat-insulating riser material for casting is applied to actual production. The performance test of the finished product of the riser material shows that: according to the fiber heat-insulating riser material for casting, disclosed by the invention, after iron oxide and carbon powder are added, the riser feeding effect is improved, the density of a riser structure is improved, and the yield is high. If metal silicon powder and copper oxide are added, the feeding effect of the riser can be further improved, and the overall quality of the riser material is better. In addition, the addition of the zirconia obviously improves the fire resistance of the riser material.
The foregoing has outlined rather broadly the preferred embodiments and principles of the present invention and it will be appreciated that those skilled in the art may devise variations of the present invention that are within the spirit and scope of the appended claims.
Claims (10)
1. The fiber heat-insulating riser material for casting is characterized by comprising the following components in parts by weight:
60-80 parts of aluminum silicate fiber, 20-35 parts of calcium oxide-containing magnesium oxychloride cement, 5-10 parts of silica micropowder, 1-3 parts of ferric oxide and 2-5 parts of carbon powder.
2. The casting fiber insulating riser material as claimed in claim 1, further comprising the following components in parts by weight: 1-2 parts of metal silicon powder and 2-4 parts of copper oxide.
3. The casting fiber insulating riser material as claimed in claim 2, wherein the molar ratio of the silicon metal powder to Si/Cu in the copper oxide is 1: 1.
4. the casting fiber insulating riser material as claimed in claim 1, further comprising the following components in parts by weight: 0.5-1 part of zirconium oxide.
5. The casting fiber insulating riser material as claimed in claim 1, which comprises the following components in parts by weight: 60 parts of aluminum silicate fiber, 30 parts of magnesium oxychloride cement containing calcium oxide, 10 parts of silicon micropowder, 2 parts of ferric oxide and 4 parts of carbon powder.
6. The casting fiber insulating riser material as claimed in claim 1, wherein the magnesium oxychloride cement is light-burned magnesium and magnesium chloride which are uniformly stirred in an aqueous solution to form a slurry.
7. The casting fiber insulating riser material as claimed in claim 6, wherein the MgO/MgCl is contained in the magnesium oxychloride cement2The molar ratio of (A) to (B) is 8 to 10.
8. The casting fiber thermal insulation feeder head material as claimed in claim 6, wherein the magnesium oxychloride cement has a solid content of 65-75%.
9. The casting fiber insulating riser material as claimed in claim 6, wherein the light-burned magnesia is magnesite with a fineness of more than 100 meshes; magnesite contains calcium oxide.
10. The thermal insulation riser material for the casting fiber as claimed in claim 1, wherein the fineness of the silica micropowder is greater than 200 meshes.
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| CN202010474407.3A CN111673049B (en) | 2020-05-29 | 2020-05-29 | Fiber heat-insulating riser material for casting |
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| CN202010474407.3A CN111673049B (en) | 2020-05-29 | 2020-05-29 | Fiber heat-insulating riser material for casting |
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| CN111673049A true CN111673049A (en) | 2020-09-18 |
| CN111673049B CN111673049B (en) | 2021-10-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115477823A (en) * | 2022-09-27 | 2022-12-16 | 长兴鼎峰铸材科技股份有限公司 | High-heating riser for turbocharger shell and preparation process thereof |
Citations (6)
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| CN1167020A (en) * | 1997-03-27 | 1997-12-10 | 河北省正定县建筑保温材料厂 | Method for making thermal-insulating riser cover used in aluminium alloy casting |
| JP2011241093A (en) * | 2010-05-14 | 2011-12-01 | Shinagawa Refractories Co Ltd | Inner lining pouring material |
| JP2016108166A (en) * | 2014-12-03 | 2016-06-20 | 新日鐵住金株式会社 | Cast refractory |
| CN105945228A (en) * | 2016-06-02 | 2016-09-21 | 长兴万顺保温材料有限公司 | Preparation method of high-durability, heat-insulation and exothermic riser |
| CN106747507A (en) * | 2016-12-13 | 2017-05-31 | 青岛万和装饰门窗工程有限公司 | A kind of light weight castable refractory and preparation method thereof |
| CN108453246A (en) * | 2018-05-15 | 2018-08-28 | 姜香 | A kind of cast steel insulated feeder coverture and preparation method thereof |
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2020
- 2020-05-29 CN CN202010474407.3A patent/CN111673049B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1167020A (en) * | 1997-03-27 | 1997-12-10 | 河北省正定县建筑保温材料厂 | Method for making thermal-insulating riser cover used in aluminium alloy casting |
| JP2011241093A (en) * | 2010-05-14 | 2011-12-01 | Shinagawa Refractories Co Ltd | Inner lining pouring material |
| JP2016108166A (en) * | 2014-12-03 | 2016-06-20 | 新日鐵住金株式会社 | Cast refractory |
| CN105945228A (en) * | 2016-06-02 | 2016-09-21 | 长兴万顺保温材料有限公司 | Preparation method of high-durability, heat-insulation and exothermic riser |
| CN106747507A (en) * | 2016-12-13 | 2017-05-31 | 青岛万和装饰门窗工程有限公司 | A kind of light weight castable refractory and preparation method thereof |
| CN108453246A (en) * | 2018-05-15 | 2018-08-28 | 姜香 | A kind of cast steel insulated feeder coverture and preparation method thereof |
Non-Patent Citations (1)
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| 苏素芹: "改性氯氧镁水泥复合保温材料的研究", 《山东建材》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115477823A (en) * | 2022-09-27 | 2022-12-16 | 长兴鼎峰铸材科技股份有限公司 | High-heating riser for turbocharger shell and preparation process thereof |
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| CN111673049B (en) | 2021-10-22 |
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