CN111360193A - Surface layer inert composite slurry for investment casting and preparation method thereof - Google Patents
Surface layer inert composite slurry for investment casting and preparation method thereof Download PDFInfo
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- CN111360193A CN111360193A CN201811597515.9A CN201811597515A CN111360193A CN 111360193 A CN111360193 A CN 111360193A CN 201811597515 A CN201811597515 A CN 201811597515A CN 111360193 A CN111360193 A CN 111360193A
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- inert
- titanium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
Abstract
A surface layer inert composite slurry for investment casting and a preparation method thereof comprise an inert zirconia binder; an inert oxide refractory powder zirconia; an inert oxide refractory powder calcium oxide; a surface active additive polyoxyethylene polymer. The inert composite slurry can be obtained by mixing and stirring the substances according to a certain proportion. The invention fully utilizes the high-temperature inertia performance of the refractory material and the effect of the additive on the stability of the slurry, has no obvious reaction on titanium and titanium-aluminum alloy castings, and has longer service life and stable and reliable performance of the slurry.
Description
Technical Field
The invention relates to the field of investment casting, in particular to surface layer slurry of an aviation titanium and titanium-aluminum alloy precision casting and a preparation method thereof.
Background
Most of the titanium and titanium-aluminum alloy parts adopt ingot casting metallurgy technology, including extrusion, forging, rolling and plate forming; powder metallurgy technology, including molding methods such as die pressing and extrusion sintering and investment precision casting technology. Because titanium and titanium-aluminum alloy have low plasticity and poor formability in a room temperature environment, the investment precision casting method is one of the most feasible methods for manufacturing titanium-aluminum alloy parts.
At present, the domestic research on investment casting of titanium and titanium-aluminum alloy has been carried out for many years, and the research contents mainly comprise a titanium-aluminum alloy smelting technology, a hot isostatic pressing technology, a shell preparation technology and the like. Among them, the shell preparation technique is one of the most critical techniques. Since titanium has a strong activity at high temperature and basically undergoes a certain chemical reaction with common materials, the selection of the shell surface layer material in direct contact with the molten metal is the key to avoid or reduce the occurrence of the reaction. In the existing shell preparation technology, the binder of the surface layer slurry generally adopts ethyl silicate binder, modified silica sol binder, inert oxide binder and the like. The added refractory powder mainly comprises alumina, calcium oxide and the like, but a surface layer slurry which does not react with molten metal and has lower use cost is not obtained.
At present, the coating binder for investment casting of titanium and titanium-aluminum alloy aviation parts mainly comprises ethyl silicate, modified silica sol, yttrium sol and the like, and the refractory material mainly comprises alumina, calcium oxide and the like. The surface layer slurry configured with the above materials has the following problems:
1. problem of reaction layer on casting surface
Because titanium is active at high temperature, the titanium can obviously react with molten metal, particularly ethyl silicate and silica sol surface layer shells, and the surface of a cast after pouring usually has a deeper surface reaction layer. The existence and thickness of the reaction layer have great influence on the performance of the casting.
2. Problem of slurry life
The surface reaction layer of the part cast by using the inert sol surface layer slurry with a general formula is shallow, but the service life of the slurry is short, and is generally about 3-5 days. This problem leads to an increase in the manufacturing cost of the parts, greatly limiting their widespread use.
Disclosure of Invention
The invention aims at solving the problem that in the investment casting process of titanium and titanium-aluminum alloy, because surface layer slurry binder and other materials are improperly selected and configured, the surface layer slurry binder and other materials can have obvious chemical reaction with molten metal at high temperature, so that the performance of a casting is reduced. In addition, the novel inert refractory material and the additive are adopted, so that the purpose that the slurry prepared according to a certain proportion does not react with molten metal and has longer slurry service life is achieved.
The invention relates to a surface layer inert composite slurry for investment casting, which comprises the following components:
an inert zirconia binder which does not react with molten titanium and titanium-aluminum alloy at high temperature and is alkaline;
the inert oxide refractory powder zirconia has a high melting point and is well inert relative to titanium and titanium-aluminum alloy at high temperature;
an inert oxide refractory powder calcium oxide, which has a high melting point and is well inert relative to titanium and titanium-aluminum alloy at high temperature;
a surface active additive polyoxyethylene polymer, which can reduce the surface tension of slurry and is favorable for coating.
A preparation method of surface layer inert composite slurry for investment casting comprises the following steps:
the method comprises the following steps: weighing 70-90 parts by weight of inert zirconia binder and adding into a batching container;
step two: weighing 1-5 parts of surface active additive polyoxyethylene polymer by weight parts and adding the surface active additive polyoxyethylene polymer into the batching container;
step three: weighing 20-40 parts by weight of inert oxide refractory powder zirconia, and adding into the batching container;
step four: weighing 10-20 parts by weight of inert oxide refractory powder calcium oxide, and adding into the batching container;
step five: and stirring the batching container for 30 minutes, and then standing for 1 hour to obtain the inert composite slurry.
The invention fully utilizes the high-temperature inertia performance of the refractory material and the effect of the additive on the stability of the slurry, has no obvious reaction on titanium and titanium-aluminum alloy castings, and has longer service life and stable and reliable performance of the slurry.
Detailed Description
An inert zirconia binder which does not react with molten titanium and titanium-aluminum alloy at high temperature and is alkaline;
the inert oxide refractory powder zirconia has a high melting point and is well inert relative to titanium and titanium-aluminum alloy at high temperature;
an inert oxide refractory powder calcium oxide, which has a high melting point and is well inert relative to titanium and titanium-aluminum alloy at high temperature;
a surface active additive polyoxyethylene polymer, which can reduce the surface tension of slurry and is favorable for coating.
A preparation method of surface layer inert composite slurry for investment casting comprises the following steps:
the method comprises the following steps: weighing 70-90 parts by weight of inert zirconia binder and adding into a batching container;
step two: weighing 1-5 parts of surface active additive polyoxyethylene polymer by weight parts and adding the surface active additive polyoxyethylene polymer into the batching container;
step three: weighing 20-40 parts by weight of inert oxide refractory powder zirconia, and adding into the batching container;
step four: weighing 10-20 parts by weight of inert oxide refractory powder calcium oxide, and adding into the batching container;
step five: and stirring the batching container for 30 minutes, and then standing for 1 hour to obtain the inert composite slurry.
Claims (2)
1. The utility model provides a compound ground paste of surface course inertia for investment casting which characterized in that: the method comprises the following components:
an inert zirconia binder which does not react with molten titanium and titanium-aluminum alloy at high temperature and is alkaline;
the inert oxide refractory powder zirconia has a high melting point and is well inert relative to titanium and titanium-aluminum alloy at high temperature;
the inert oxide refractory material powder calcium oxide has a high melting point and is well inert relative to a titanium-aluminum alloy at a high temperature;
a surface active additive polyoxyethylene polymer, which can reduce the surface tension of slurry and is favorable for coating.
2. The method for preparing inert composite slurry for investment casting according to claim 1, wherein the method comprises the following steps:
the method comprises the following steps: weighing 70-90 parts by weight of inert zirconia binder and adding into a batching container;
step two: weighing 1-5 parts of surface active additive polyoxyethylene polymer by weight parts and adding the surface active additive polyoxyethylene polymer into the batching container;
step three: weighing 20-40 parts by weight of inert oxide refractory powder zirconia, and adding into the batching container;
step four: weighing 10-20 parts by weight of inert oxide refractory powder calcium oxide, and adding into the batching container;
step five: and stirring the batching container for 30 minutes, and then standing for 1 hour to obtain the inert composite slurry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811597515.9A CN111360193A (en) | 2018-12-26 | 2018-12-26 | Surface layer inert composite slurry for investment casting and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811597515.9A CN111360193A (en) | 2018-12-26 | 2018-12-26 | Surface layer inert composite slurry for investment casting and preparation method thereof |
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| CN111360193A true CN111360193A (en) | 2020-07-03 |
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| CN201811597515.9A Pending CN111360193A (en) | 2018-12-26 | 2018-12-26 | Surface layer inert composite slurry for investment casting and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112517846A (en) * | 2020-10-23 | 2021-03-19 | 中国科学院金属研究所 | Method for reducing inclusion content of high-temperature alloy casting |
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| CN1225045A (en) * | 1996-05-13 | 1999-08-04 | 联合讯号公司 | Inert calcia facecoats for investment casting of titanium and titanium-aluminide alloys |
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| CN102151787A (en) * | 2011-05-30 | 2011-08-17 | 哈尔滨工业大学 | 600-DEG C high-temperature titanium alloy fired mold casting type shell surface painting and preparation method thereof |
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| CN107497999A (en) * | 2017-09-01 | 2017-12-22 | 东风精密铸造安徽有限公司 | A kind of titanium investment pattern precision casting process |
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| JP5110276B2 (en) * | 2007-11-02 | 2012-12-26 | 日産化学工業株式会社 | Slurry for precision casting mold |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112517846A (en) * | 2020-10-23 | 2021-03-19 | 中国科学院金属研究所 | Method for reducing inclusion content of high-temperature alloy casting |
| CN112517846B (en) * | 2020-10-23 | 2022-01-14 | 中国科学院金属研究所 | Method for reducing inclusion content of high-temperature alloy casting |
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