CN103771886A - Method for preparing yttrium oxide coating of corundum crucible - Google Patents
Method for preparing yttrium oxide coating of corundum crucible Download PDFInfo
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- CN103771886A CN103771886A CN201410035717.XA CN201410035717A CN103771886A CN 103771886 A CN103771886 A CN 103771886A CN 201410035717 A CN201410035717 A CN 201410035717A CN 103771886 A CN103771886 A CN 103771886A
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Abstract
The invention discloses a method for preparing an yttrium oxide coating of a corundum crucible. The method comprises steps of mixing yttrium oxide powder, polyethylene glycol and distilled water according to a mass ratio of 3:1:1, stirring to form uniform sizing agent without bubbles, uniformly coating the sizing agent on the inner wall of a corundum tube cleaned up by ultrasonic and dried, naturally drying for 2 hours, then putting the corundum tube into an oven and baking for 6-12 hours at 50-70 DEG C, putting the corundum tube into a muffle furnace and sintering at low temperature of 600-800 DEG C for 6-12 hours, cooling along with the furnace, then sintering and baking at high temperature of 1500-1600 DEG C for 6-12 hours, and cooling along with the furnace. The method is simple, has low cost, is used for directional freezing of alloy containing active elements, can prevent the alloy from reacting with the crucible, and guarantees the purity and property of the alloy; the corundum tube with yttrium oxide coating reaches up to the temperature of 1600 DEG C after long-term use, thus having wide application prospect in casting, remelting and directional freezing of high-melting-point high-activity alloy.
Description
Technical field
The invention discloses a kind of method of preparing corundum crucible yttria coating, belong to field of material preparation.
Background technology
The fast development of aircraft industry, forces and starts improving constantly of turbine-entry temperature, has more bearing high temperature ability, more low-gravity turbine blade, the requirement improving constantly to meet engine thrust-weight ratio in the urgent need to selecting.Through the development of nearly 30 years, nickel base superalloy, titanium aluminum alloy be successful Application aircraft engine turbine blade, has effectively improved the thrust-weight ratio of engine.For further promoting motor performance, the pollution that effectively solves mother alloy melting and forming materials process interalloy thereof is the assurance that obtains high performance material.Especially directional freeze cylindrulite or monocrystalline, the appearance of impurity may form stray crystal or affect the tissue of alloy, and then affects alloy property.Therefore, the stability of mother alloy smelting pot and directional freeze crucible is that control melting or forming process interalloy are exempted from contaminated key.
Corundum crucible has the advantages such as intensity is high, high temperature resistant, corrosion-resistant, the first-selected crucible as the technique such as high melt, directional freeze always since development.But the active element (as titanium etc.) in alloy keeps long molten state in corundum crucible, can chemical reaction occur and pollute alloy, even causes crucible to burn.For this reason, researchist has made large quantity research both at home and abroad, people (the Kartavykh AV such as Kartavykh AV, VV, Zollinger J.TiAl-Nb melt interaction with pyrolytic boron nitride crucibles.2010,119:347-350) adopt boron nitride crucible melting titanium aluminum alloy, Ti will react under discovery high temperature
3al+BN → Ti
2alN+TiB, has caused the substantial deviation of alloying constituent.The human hairs such as Lu Xionggang (patent No.: CN101830715A) understand the preparation method of a kind of CaO refractory materials and crucible, can be used for the melting moulding of titanium or titanium alloy, but the problem of the easy aquation of CaO material have limited the application of CaO crucible.The people such as Lapin (LapinJ,
z,
t.Effect of Y
2o
3crucible on contamination of directionally solidified intermetallic Ti-46Al-8Nb alloy, Intermetallics.2011,19:396-403) and people (the Cui RJ such as Cui, Tang XX, Gao M, Zhang H, Gong SK.Microstructure and composition of cast Ti-47Al-2Cr-2Nb alloys produced by yttria crucibles.2012,541:14-21) adopt yttrium oxide crucible directional solidification titanium aluminum alloy, yttrium oxide crucible expensive limited its application.
Therefore, need the crucible of a kind of low cost and stable performance badly, to meet the melting or the moulding that contain active mischmetal (as titanium alloy, titanium aluminum alloy, nickel base superalloy etc.).There is report, yttrium oxide pattern is prepared in corundum crucible inside by University of Science & Technology, Beijing's (patent No.: CN101984321A), be applied to the directional freeze of titanium aluminum alloy, but in directional freeze process, the part of yttria particles comes off still and to exist, seriously reduce alloy property, limited the further application of titanium aluminum alloy.The method of the alundum tube coating that processability is stable is the key that solves this deficiency, and based on this, the present invention will provide a kind of novel method of preparing corundum crucible yttria coating, solves the deficiencies in the prior art.
Summary of the invention
The object of the present invention is to provide a kind of for containing active mischmetal smelting, the preparation method of directional freeze with the corundum crucible of inertia yttria coating.
A method of preparing corundum crucible yttria coating, said method comprising the steps of:
The first step: the preparation of slurry: by yttrium oxide, polyoxyethylene glycol and distilled water in mass ratio 3:1:1 mix, stir to without bubble;
Second step: the preparation of coating: slurry described in the first step is evenly coated in to the alundum tube inwall clean through ultrasonic cleaning, and seasoning, puts into baking oven and toast 6-12 hour at 50-80 ℃;
The 3rd step: the sintering of coating: by the alundum tube of the good coating of the coating described in second step, put into retort furnace and carry out low-temperature sintering and high temperature sintering, then furnace cooling.
Wherein, the yttrium oxide described in the first step adopts analytical pure yttrium oxide.
The seasoning time described in second step is 2 hours.
Low-temperature sintering described in the 3rd step for being incubated 6-12 hour at 600-800 ℃; High temperature sintering for to be incubated 6-12 hour at 1500-1600 ℃.
The remarkable advantage that the present invention has is: (1) preparation technology of the present invention is simple, with low cost.(2) the present invention is for containing the directional freeze of active mischmetal, can block reacting of alloy and crucible, guaranteed purity and the performance of alloy.(3) alundum tube with yttria coating that prepared by the present invention, life-time service temperature, up to 1600 ℃, all has broad application prospects in casting, remelting and the directional freeze of high-melting-point alloy with high activity.
Accompanying drawing explanation
Fig. 1 is the preparation flow figure of yttria coating of the present invention.
Embodiment
The preparation technology of yttria coating of the present invention is shown in Fig. 1.
Embodiment 1
The first step: the preparation of slurry
By analytically pure yttrium oxide, polyoxyethylene glycol and distilled water in mass ratio 3:1:1 mix, stir to without bubble.
Second step: the preparation of coating
Slurry described in the first step is evenly coated in to the alundum tube inwall clean through ultrasonic cleaning, and seasoning 2 hours, then puts into baking oven and at 50 ℃, toasts 12 hours.
The 3rd step: the sintering of coating
By the alundum tube of the good coating of the coating described in second step, put into retort furnace low-temperature sintering 12 hours at 600 ℃, then furnace cooling; High temperature sintering baking 12 hours at 1500 ℃, then furnace cooling.
Embodiment 2
The first step: the preparation of slurry
By analytically pure yttrium oxide, polyoxyethylene glycol and distilled water in mass ratio 3:1:1 mix, stir to without bubble.
Second step: the preparation of coating
Slurry described in the first step is evenly coated in to the alundum tube inwall clean through ultrasonic cleaning, and seasoning 2 hours, then puts into baking oven and at 80 ℃, toasts 6 hours.
The 3rd step: the sintering of coating
By the alundum tube of the good coating of the coating described in second step, put into retort furnace low-temperature sintering 6 hours at 800 ℃, then furnace cooling; High temperature sintering baking 6 hours at 1600 ℃, then furnace cooling.
Embodiment 3
The first step: the preparation of slurry
By analytically pure yttrium oxide, polyoxyethylene glycol and distilled water in mass ratio 3:1:1 mix, stir to without bubble.
Second step: the preparation of coating
Slurry described in the first step is evenly coated in to the alundum tube inwall clean through ultrasonic cleaning, and seasoning 2 hours, then puts into baking oven and at 65 ℃, toasts 9 hours.
The 3rd step: the sintering of coating
By the alundum tube of the good coating of the coating described in second step, put into retort furnace low-temperature sintering 9 hours at 750 ℃, then furnace cooling; High temperature sintering baking 9 hours at 1550 ℃, then furnace cooling.
Claims (4)
1. prepare a method for corundum crucible yttria coating, it is characterized in that said method comprising the steps of:
The preparation of the first step, slurry: by yttrium oxide, polyoxyethylene glycol and distilled water in mass ratio 3:1:1 mix, stir to without bubble;
The preparation of second step, coating: slurry described in the first step is evenly coated in to the alundum tube inwall clean through ultrasonic cleaning, and seasoning, puts into baking oven and toast 6-12 hour at 50-80 ℃;
The sintering of the 3rd step, coating: by the alundum tube of the good coating of the coating described in second step, put into retort furnace and carry out low-temperature sintering and high temperature sintering, then furnace cooling.
2. the method for preparing corundum crucible yttria coating according to claim 1, is characterized in that the yttrium oxide described in the first step adopts analytical pure yttrium oxide.
3. the method for preparing corundum crucible yttria coating according to claim 1, is characterized in that the seasoning time described in second step is 2 hours.
4. the method for preparing corundum crucible yttria coating according to claim 1, is characterized in that the low-temperature sintering described in the 3rd step for being incubated 6-12 hour at 600-800 ℃; High temperature sintering for to be incubated 6-12 hour at 1500-1600 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410035717.XA CN103771886A (en) | 2014-01-24 | 2014-01-24 | Method for preparing yttrium oxide coating of corundum crucible |
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| CN201410035717.XA CN103771886A (en) | 2014-01-24 | 2014-01-24 | Method for preparing yttrium oxide coating of corundum crucible |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104227008A (en) * | 2014-09-23 | 2014-12-24 | 西安瑞鑫科金属材料有限责任公司 | Method for preparing titanium-zirconium-copper-nickel alloy braze powder |
| CN112430092A (en) * | 2020-12-16 | 2021-03-02 | 湖南仁海科技材料发展有限公司 | Yttria coating for sintering titanium alloy MIM (metal-insulator-metal) product and application of yttria coating to corundum-mullite setter plate |
| CN113620694A (en) * | 2021-09-03 | 2021-11-09 | 湖南昕昱科技有限公司 | Crucible for smelting alloy containing active elements and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101498549A (en) * | 2009-03-16 | 2009-08-05 | 北京航空航天大学 | Crucible with Y2O3 anti-corrosion coating and method for producing Y2O3 anti-corrosion coating by slip-casting shaping process |
| CN101532776A (en) * | 2009-03-16 | 2009-09-16 | 北京航空航天大学 | Crucible with Y2O3 etching resistant coating and method for producing Y*O* etching resistant coating using slip casting moulding technique |
-
2014
- 2014-01-24 CN CN201410035717.XA patent/CN103771886A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101498549A (en) * | 2009-03-16 | 2009-08-05 | 北京航空航天大学 | Crucible with Y2O3 anti-corrosion coating and method for producing Y2O3 anti-corrosion coating by slip-casting shaping process |
| CN101532776A (en) * | 2009-03-16 | 2009-09-16 | 北京航空航天大学 | Crucible with Y2O3 etching resistant coating and method for producing Y*O* etching resistant coating using slip casting moulding technique |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104227008A (en) * | 2014-09-23 | 2014-12-24 | 西安瑞鑫科金属材料有限责任公司 | Method for preparing titanium-zirconium-copper-nickel alloy braze powder |
| CN104227008B (en) * | 2014-09-23 | 2016-05-18 | 西安瑞鑫科金属材料有限责任公司 | A kind of preparation method of titanium zirconium German silver solder powder |
| CN112430092A (en) * | 2020-12-16 | 2021-03-02 | 湖南仁海科技材料发展有限公司 | Yttria coating for sintering titanium alloy MIM (metal-insulator-metal) product and application of yttria coating to corundum-mullite setter plate |
| CN113620694A (en) * | 2021-09-03 | 2021-11-09 | 湖南昕昱科技有限公司 | Crucible for smelting alloy containing active elements and preparation method thereof |
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