CN102069158B - Coating of slope for preparing semi-solid slurry and spraying method thereof - Google Patents
Coating of slope for preparing semi-solid slurry and spraying method thereof Download PDFInfo
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- CN102069158B CN102069158B CN 201110004778 CN201110004778A CN102069158B CN 102069158 B CN102069158 B CN 102069158B CN 201110004778 CN201110004778 CN 201110004778 CN 201110004778 A CN201110004778 A CN 201110004778A CN 102069158 B CN102069158 B CN 102069158B
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- boron nitride
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- mass ratio
- chute
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- 239000011248 coating agent Substances 0.000 title claims abstract description 54
- 238000000576 coating method Methods 0.000 title claims abstract description 54
- 239000007787 solid Substances 0.000 title claims abstract description 25
- 238000005507 spraying Methods 0.000 title claims abstract description 21
- 239000002002 slurry Substances 0.000 title claims abstract description 17
- 238000007613 slurry method Methods 0.000 title description 2
- 239000000843 powder Substances 0.000 claims abstract description 34
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229910052582 BN Inorganic materials 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 12
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 claims abstract description 5
- QYEXBYZXHDUPRC-UHFFFAOYSA-N B#[Ti]#B Chemical compound B#[Ti]#B QYEXBYZXHDUPRC-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910033181 TiB2 Inorganic materials 0.000 claims abstract description 4
- UQZIWOQVLUASCR-UHFFFAOYSA-N alumane;titanium Chemical compound [AlH3].[Ti] UQZIWOQVLUASCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 2
- 210000003625 skull Anatomy 0.000 abstract description 17
- 238000000034 method Methods 0.000 abstract description 16
- 238000002360 preparation method Methods 0.000 abstract description 2
- OQPDWFJSZHWILH-UHFFFAOYSA-N [Al].[Al].[Al].[Ti] Chemical compound [Al].[Al].[Al].[Ti] OQPDWFJSZHWILH-UHFFFAOYSA-N 0.000 abstract 1
- 239000007921 spray Substances 0.000 abstract 1
- 229910021324 titanium aluminide Inorganic materials 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 210000001519 tissue Anatomy 0.000 description 8
- 238000001816 cooling Methods 0.000 description 7
- 241000283070 Equus zebra Species 0.000 description 5
- 230000001680 brushing effect Effects 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011259 mixed solution Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000010292 electrical insulation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009967 tasteless effect Effects 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 229910010038 TiAl Inorganic materials 0.000 description 1
- 229910010039 TiAl3 Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000007983 Tris buffer Substances 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003913 materials processing Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Images
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- Nozzles (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention relates to a coating of a slope for preparing semi-solid slurry and a spraying method thereof. The method is to spray a 'zebra-shaped' coating on the working surface of the slope in a direction perpendicular to the axis, wherein the coating is obtained by mixing water and boron nitride powder in a mass ratio of 85 to 15, or obtained by mixing water, boron nitride powder and titanium aluminide powder in a mass ratio of 85: 8-12: 4-6, or obtained by mixing water, boron nitride powder and titanium diboride powder in a mass ratio of 85: 8-12: 3-7, or obtained by mixing water, boron nitride powder and titanium carbide powder in a mass ratio of 85: 9-11: 4-6. The coating is simple in spreading, low in cost, easy to operate and control and free from damage and pollution to people and environment, and can effectively resolve the contradiction between the generation of skulls and nonideal microstructures during the preparation of the semi-solid slurry.
Description
Technical Field
The invention relates to semi-solid metal forming equipment and a semi-solid metal forming process, in particular to a coating of a chute for preparing semi-solid slurry and a spraying method thereof.
Background
Because semisolid metal forming has many unique advantages, such as near (clean) final forming, high quality of products, high-performance process energy conservation and the like, the semisolid metal forming is known as one of the most promising metal material processing technologies in the 21 st century. Once proposed, therefore, has raised a high degree of interest to the materials workers in theory and application as well as a wide interest to the commercial group. The production of semi-solid metal and alloy slurries or billets is of great importance from both an economic perspective and from a process stability perspective. Currently, various methods for preparing semi-solid metal slurries or billets have been developed.
The cooling chute method is a new process invented by japan ltd for preparing semi-solid billets of aluminum alloy and magnesium alloy in 1998, which has been patented in europe. The principle of the method is as follows: the molten metal slightly higher than liquidus temperature is poured onto the cooling plate, fine crystal grains are formed and grown on the wall of the plate due to the cooling effect of the inclined plate, and the crystal grains roll off from the wall of the plate under the action of the scouring of the metal fluid and the self weight of the object so as to achieve the stirring effect, further refine the crystal grains and obtain the ideal microstructure. However, in this process, the chute surface can form a thick skull, wasting raw material.
The disclosed aspects show that spraying a Boron Nitride (BN) coating on the chute surface can effectively avoid the generation of skull on the chute surface (Toshio Haga, semi strip casting using a twin roll casting with a cooling slide, Journal of Materials Processing Technology, 2002(130-131), 558-561). However, when the surface of the chute is completely coated, although the generation of skull can be avoided, the ideal semi-solid structure cannot be obtained. Therefore, it is highly desirable to find a new method that can not only effectively avoid or reduce the generation of skull, but also obtain a more ideal semi-solid tissue.
Disclosure of Invention
In view of the above problems in the prior art, the present invention discloses a novel mixed coating and a spraying method thereof in order to reduce the skull generated in the process of preparing semi-solid slurry by a cooling chute or avoid the unsatisfactory structure caused by skull generation.
The technical solution of the invention is realized as follows:
a spraying method of a chute for preparing semi-solid slurry is characterized in that:
the method comprises the steps of spraying a 'zebra-shaped' coating on the working surface of the chute in a direction perpendicular to the axial direction, namely spraying coating strips in an arc strip shape on the working surface of the chute at certain intervals in the direction perpendicular to the axial direction, wherein a non-coating strip which is not sprayed is arranged between every two adjacent coating strips, and the width ratio of the coating strips to the non-coating strips along the axial direction is 1-2: 1.
Further, the coating is formed by mixing water and Boron Nitride (BN) powder according to the mass ratio of 85: 15; or,
the coating is water, Boron Nitride (BN) powder and titanium aluminum tris (TiAl)3) The powder is mixed according to the mass ratio of 85:8-12: 4-6; or,
the coating is water, Boron Nitride (BN) powder, titanium diboride (TiB)2) The powder is mixed according to the mass ratio of 85:8-12: 3-7; or,
the coating is formed by mixing water, Boron Nitride (BN) powder and titanium carbide (TiC) powder according to the mass ratio of 85:9-11: 4-6;
the Boron Nitride (BN) is hexagonal boron nitride white powder, is tasteless and nontoxic, and has good electrical insulation and chemical stability.
The problem of the cooling chute method for preparing the semi-solid slurry is mainly that the solidified shell is formed on the surface of the chute, as shown in fig. 5 and 6(a), the maximum thickness of the solidified shell can reach 5cm, and the length of the solidified shell is the total length of the chute; in order to avoid the generation of skull, the surface of the chute is coated with BN, although skull can be effectively avoided when the surface is fully coated, the structure is not ideal, when the surface is not brushed, the structure is mostly spherical or rosette, as shown in figure 2, and when the surface is fully coated, the structure is equiaxial, as shown in figures 3(a) and 4 (a); in contrast, when the spraying mode of the zebra-shaped coating is adopted, the tissue morphology of the zebra-shaped coating is obviously optimized compared with the situation of brushing the coating as shown in fig. 3(b) and fig. 4 (b); moreover, the skull is greatly reduced compared with the case without brushing, and as shown in fig. 6(b) (c), the maximum thickness of the skull is only a few millimeters, and the length is less than 30 cm; obviously, the spraying mode of the invention can not only effectively reduce the generation of skull in the process of preparing the semi-solid slurry by the cooling chute method, but also obtain an ideal semi-solid structure, thereby obtaining excellent cost performance.
Meanwhile, on the other hand, comparing fig. 3(a) with fig. 4(a), and fig. 3(b) with fig. 4(b), respectively, it can be clearly seen that the use of the mixed coating enables the obtained semi-solid tissue to obtain better spheroidizing effect; also, from a comparison of fig. 6(b) (c), it can be concluded that the skull on the chute working surface is further improved with the hybrid coating.
Drawings
FIG. 1 is a schematic representation of a zebra coating, in which 1. coating stripes; 2. a non-coated strip;
FIG. 2 shows a photograph of the resulting topography of the tissue without brushing;
FIG. 3 shows a photographic comparison of the resulting topography of the tissue in the case of a "zebra" spray coating with a BN coating (a) full brush fill (b);
FIG. 4 shows the use of BN + TiAl3The obtained photographs of the tissue morphology were compared in the case of a full brush-on (b) "zebra" coating (a);
FIG. 5 shows a photograph of the skull formed on the working surface of the chute without brushing;
fig. 6 shows a comparison of the skull formation on the chute work surface for (a) no brush coating (b) spray coating of "zebra" BN coating (c) spray coating of "zebra" hybrid coating.
Detailed Description
A chute used for preparing semi-solid slurry is semi-cylindrical, the diameter of the cross section of the chute is 25mm, the length of the chute is 1m, a mixed coating is sprayed on the chute, and the formula and the preparation method of the mixed coating are as follows:
water: 85ml of
Titanium and aluminum: 5g
Boron nitride: 10g
The Boron Nitride (BN) is hexagonal boron nitride white powder, is tasteless and nontoxic, and has good electrical insulation and chemical stability.
And (3) placing the boron nitride powder in cold water, fully stirring to fully dissolve the boron nitride powder, adding titanium-aluminum tri-powder when the boron nitride powder is dissolved into a viscous state, and uniformly stirring to obtain a mixed solution. And manually coating the mixed solution on the surface of the chute according to the zebra-shaped structure, and solidifying the mixed solution on the surface of the chute after coating and air drying to obtain a protective layer, namely the special coating for the chute prepared from the semi-solid slurry.
The specific spraying method comprises the following steps:
spraying a 'zebra-shaped' coating on the working surface of the chute in a direction perpendicular to the axial direction, namely spraying coating strips in an arc strip shape on the working surface of the chute in a certain interval in the direction perpendicular to the axial direction, wherein a non-coating strip which is not sprayed is arranged between every two adjacent coating strips, and the widths of the coating strips and the non-coating strips along the axial direction are both 10cm, as shown in fig. 1.
The semi-solid slurry is prepared by adopting the spraying method, and the appearance of the obtained semi-solid tissue is shown in figure 4 (b); the skull formation is shown in FIG. 6 (c).
Practice proves that the invention has simple coating, low cost, no damage and pollution to people and environment, easy operation and control, and can effectively solve the contradiction of the generation of skull and the imperfect tissue in the process of preparing the semi-solid slurry.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (2)
1. A spraying method of a chute for preparing semi-solid slurry is characterized in that:
spraying a 'zebra-shaped' coating on the working surface of the chute in a direction perpendicular to the axial direction, namely spraying strip-shaped coating strips on the working surface of the chute in a certain interval in the direction perpendicular to the axial direction, wherein a non-coating strip which is not sprayed is arranged between every two adjacent coating strips, and the width ratio of the coating strips to the non-coating strips along the axial direction is 1-2: 1;
the coating is formed by mixing water, boron nitride powder and titanium-aluminum triple powder according to the mass ratio of 85:8-12: 4-6; or,
the coating is formed by mixing water, boron nitride powder and titanium diboride powder according to the mass ratio of 85:8-12: 3-7; or,
the coating is formed by mixing water, boron nitride powder and titanium carbide powder according to the mass ratio of 85:9-11: 4-6;
wherein the boron nitride is a hexagonal boron nitride white powder.
2. A coating of a chute for preparing semi-solid slurry is a mixed coating, and is characterized in that:
the titanium-aluminum alloy is formed by mixing water, boron nitride powder and titanium-aluminum triple powder according to the mass ratio of 85:8-12: 4-6; or,
is prepared by mixing water, boron nitride powder and titanium diboride powder according to the mass ratio of 85:8-12: 3-7; or,
is formed by mixing water, boron nitride powder and titanium carbide powder according to the mass ratio of 85:9-11: 4-6;
wherein the boron nitride is a hexagonal boron nitride white powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110004778 CN102069158B (en) | 2011-01-11 | 2011-01-11 | Coating of slope for preparing semi-solid slurry and spraying method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110004778 CN102069158B (en) | 2011-01-11 | 2011-01-11 | Coating of slope for preparing semi-solid slurry and spraying method thereof |
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| Publication Number | Publication Date |
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| CN102069158A CN102069158A (en) | 2011-05-25 |
| CN102069158B true CN102069158B (en) | 2013-01-02 |
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| CN 201110004778 Expired - Fee Related CN102069158B (en) | 2011-01-11 | 2011-01-11 | Coating of slope for preparing semi-solid slurry and spraying method thereof |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4772320A (en) * | 1987-03-30 | 1988-09-20 | Aluminum Company Of America | Metal recovery from dross |
| EP0745694A1 (en) * | 1995-05-29 | 1996-12-04 | Ube Industries, Ltd. | Method and apparatus for shaping semisolid metals |
| CN1424420A (en) * | 2002-12-30 | 2003-06-18 | 西安交通大学 | Preparation for ferroalloys semisolid slurry material |
| CN1757459A (en) * | 2005-10-30 | 2006-04-12 | 朴龙云 | Method for preparing semi-solidified slurry of aluminium alloy, and its forming apparatus |
| CN101054636A (en) * | 2007-05-31 | 2007-10-17 | 东北大学 | Wave type inclined plate vibration device for preparing semisolid state alloy and preparation method thereof |
| CN101130203A (en) * | 2007-10-19 | 2008-02-27 | 北京科技大学 | Method for preparing semi-solid metal slurry and rheologic molding |
| CN101660063A (en) * | 2009-09-25 | 2010-03-03 | 河北科技大学 | Device for preparing semi-solid alloy melt and process for preparing AlSi9Mg semi-solid alloy |
| CN101817064A (en) * | 2009-04-24 | 2010-09-01 | 兰州理工大学 | Device and method for preparing metal semi-solid slurry |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0987773A (en) * | 1995-09-29 | 1997-03-31 | Ube Ind Ltd | Method for molding half-molten metal |
| JP3920378B2 (en) * | 1996-07-24 | 2007-05-30 | 株式会社アーレスティ | Rheocast casting method and rheocast casting equipment |
| CN201677026U (en) * | 2010-05-13 | 2010-12-22 | 昆明理工大学 | Sampling device used in preparation of semi-solid metal slurry by tilting-plate method |
-
2011
- 2011-01-11 CN CN 201110004778 patent/CN102069158B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4772320A (en) * | 1987-03-30 | 1988-09-20 | Aluminum Company Of America | Metal recovery from dross |
| EP0745694A1 (en) * | 1995-05-29 | 1996-12-04 | Ube Industries, Ltd. | Method and apparatus for shaping semisolid metals |
| CN1424420A (en) * | 2002-12-30 | 2003-06-18 | 西安交通大学 | Preparation for ferroalloys semisolid slurry material |
| CN1757459A (en) * | 2005-10-30 | 2006-04-12 | 朴龙云 | Method for preparing semi-solidified slurry of aluminium alloy, and its forming apparatus |
| CN101054636A (en) * | 2007-05-31 | 2007-10-17 | 东北大学 | Wave type inclined plate vibration device for preparing semisolid state alloy and preparation method thereof |
| CN101130203A (en) * | 2007-10-19 | 2008-02-27 | 北京科技大学 | Method for preparing semi-solid metal slurry and rheologic molding |
| CN101817064A (en) * | 2009-04-24 | 2010-09-01 | 兰州理工大学 | Device and method for preparing metal semi-solid slurry |
| CN101660063A (en) * | 2009-09-25 | 2010-03-03 | 河北科技大学 | Device for preparing semi-solid alloy melt and process for preparing AlSi9Mg semi-solid alloy |
Non-Patent Citations (2)
| Title |
|---|
| JP特开平10-34307A 1998.02.10 |
| JP特开平9-87773A 1997.03.31 |
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