CN101671807A - Method for coating crucible surface - Google Patents
Method for coating crucible surface Download PDFInfo
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- CN101671807A CN101671807A CN200910272308A CN200910272308A CN101671807A CN 101671807 A CN101671807 A CN 101671807A CN 200910272308 A CN200910272308 A CN 200910272308A CN 200910272308 A CN200910272308 A CN 200910272308A CN 101671807 A CN101671807 A CN 101671807A
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- crucible
- aluminium
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- putting
- diffusion treatment
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Abstract
The invention relates to a method for coating a crucible surface, which comprises the following steps: (1) soaking a steel crucible into diluted hydrochloric acid to remove rust and to be cleaned; (2)soaking the crucible into acetone solution to remove oil; (3) after finishing soaking in the acetone, taking out the crucible and again putting the crucible into running tap water to be washed; (4) putting the steel crucible into mixed aqueous solution prepared by NaNO3, CrO3 and KMnO4 to be soaked; (5) putting the crucible into melting aluminium obtained by melting commercially pure aluminium tocarry out aluminium bath, and then cooling the crucible; and (6) putting the crucible into an air-heating furnace to carry out heating and diffusion treatment, then discharging, putting the cruciblein the air and cooling. By adopting the invention, the alloy steel crucible can have the properties of little proneness to be damaged and cracked, and thermo shock resistance, thereby the invention greatly prolongs the service life of the crucible, improves the properties of test units, and provides advantages for smoothly carrying out experimental studies.
Description
Technical field
The present invention relates to a kind of steel alloy crucible that testing laboratory's refining coke is used and carry out the surface-treated method, specifically a kind of method of coating crucible surface.
Background technology
Along with applying of blast furnace strengthening smelting technology, the skeleton function of coke in blast furnace more and more is subjected to smelting iron and coking worker's common concern.The factor that influences thermal property of coke is a lot, at coke making process fixedly the time, select and use coking coal, and to carry out reasonable coal blending is the main path that improves coke pyrometallurgy thermal characteristics.
At present because the single coal of planting of the coking that each coke-oven plant uses always is wide in variety, quantity is big, usually adopt the experiment of refining crucible coke to study, so that single thermal property of coke of planting coal coke, different proportioning coal blendings is made an appraisal, but optimized choice coal blending scheme provides foundation for formulating rational production coal blending scheme.Coke is with the product of coal after secluding air carries out destructive distillation under the hot conditions, normally 1000 ± 50 ℃ of the temperature of refining crucible coke, and being used for the crucible of coking in the test has corundum crucible and steel alloy crucible.Use corundum crucible, corundum crucible surfaces externally and internally smoother all after the coking, no apparent damage, but corundum crucible in use is easy to generate crackle or breaks; Use the steel alloy crucible, the steel alloy inner surface of crucible has been completely cut off the part smoother of air by coal dust or coke powder after the coking, no apparent damage, and inlet part has iron scale on the steel alloy crucible; Outside surface in use forms very thick, loose zone of oxidation, and a large amount of decortications, peeling phenomenon are arranged, and causes the sidewall of crucible thickness seriously uneven, starts a leak.Therefore corundum crucible or steel alloy crucible often need to change, and pot life is short, test consuming cost height.Therefore solve the high temperature resistant of crucible surface and resistance to oxidation problem is the technical problem that the coking technology personnel need to be resolved hurrily always.
Summary of the invention
Purpose of the present invention is exactly the defective at prior art, and a kind of method of coating crucible surface is provided, and it can solve the high temperature resistant of crucible surface and resistance to oxidation problem.
Technical scheme of the present invention is achieved in that it may further comprise the steps:
(1), Steel Crucible is soaked rust cleaning with dilute hydrochloric acid, water is rinsed well then;
(2), crucible is immersed in carries out oil removing in the acetone soln;
(3), in acetone, soaked after, take out and to put into the mobile tap water once more and wash, bright and clean to crucible surface;
(4), Steel Crucible is put into used NaNO
3, CrO
3And KMnO
4Soak in the mixed aqueous solution of preparation;
(5), crucible puts into the molten aluminium that is melted into commercial-purity aluminium and carries out aluminium and bathe, take out crucible then and cool off;
(6), crucible put into air-heating furnace add heat diffusion treatment, come out of the stove then, be placed on that cooling gets final product in the air.
The present invention's technical scheme preferably is: the aluminium bath temperature was 720-760 ℃ when aluminium was bathed, and crucible soaks in aluminium is bathed and crosses 20-50 minute, after the surface forms even, the bright aluminized coating of one deck, took out crucible and cooled off; When adding heat diffusion treatment, the temperature of air-heating furnace is 900-980 ℃, and the time of heat diffusion treatment DIFFUSION TREATMENT is 4-6 hour; NaNO in the described mixed aqueous solution
3, CrO
3And KMnO
4Mass percent concentration be respectively 0.4%, 0.2%, 0.05%.
The present invention combines the good characteristic of corundum crucible and steel alloy crucible, and the alloy Steel Crucible is adopted surface strengthening treatment technology, forms Al at the steel alloy crucible surface
2O
3Protective layer; Ferro-aluminium at high temperature with airborne oxygen effect; form one deck densification and firm protective membrane at crucible surface; can effectively protect inner base not oxidized; strengthen oxidation-resistance property and corrosion resistance; make the steel alloy crucible have not cracky, be difficult for cracking, the performance of anti-rapid heat cycle prolongs pot life greatly; promoted the testing apparatus performance, everything goes well with your work carries out and created favourable condition for experimental study.
Embodiment
Below in conjunction with being that strength is further described the present invention:
Embodiment 1
One material is prepared
1 matrix: steel alloy crucible
2 coated materials:
Commercial-purity aluminium: purity＞95%;
NaNO
3: chemical pure
CrO
3: chemical pure
KMnO
4: chemical pure
Two are coated with layer manufacturing method thereof
1 soaks the steel alloy crucible 10～30 minutes with 10% dilute hydrochloric acid, eliminates rust;
2 taking-up steel alloy crucibles are put into the mobile tap water and are washed, and with the acidity of pH detection paper water, the pH value that makes flushing back water is with tap water pH value;
Be immersed in after 3 crucibles that water is rinsed well take out and carry out oil removing in the acetone soln, infuser device places in the exhausting cupboard;
4 soak certain hour in acetone, taking-up is put into the mobile tap water once more and washed, and is bright and clean to crucible surface;
5 take out the steel alloy crucible puts into the NaNO that uses mass percent 0.4%
3, 0.2% CrO
3With 0.05% KMnO
4In the mixed aqueous solution of preparation, soak and carried out pre-treatment in 5-10 minute, dry up with hair dryer;
6 put into the aluminium that is melted into commercial-purity aluminium with pretreated crucible bathes;
720 ℃ of 7 aluminium bath temperatures, crucible soak in aluminium is bathed and cross 20-50 minute, after the surface forms even, the bright aluminized coating of one deck, take out crucible and cool off.
8 put into 900 ℃ air-heating furnace with crucible adds heat diffusion treatment.
9 DIFFUSION TREATMENT 4 hours are closed the process furnace power supply, treat that stove is chilled to 600 ℃ after, crucible is come out of the stove, and is placed in the air cooling and gets final product.
10 are used for the laboratory with the steel alloy crucible behind the surface recombination aluminum coating refines the crucible coke.Because the crucible top layer is by the continuous void-free Al of densification
2O
3Layer and the phase composite of ferro-aluminum compound make crucible have high temperature oxidation resisting and corrosion resistant performance, and this top coat hardness are big, intensity is high, wear resistance good.
Embodiment 2
Other step is with embodiment 1, and the aluminium bath temperature was 760 ℃ when wherein aluminium was bathed, and when adding heat diffusion treatment, the temperature of air-heating furnace is 900-980 ℃, and the time of heat diffusion treatment DIFFUSION TREATMENT is 6 hours.
Embodiment 3
Other step is with embodiment 1, and the aluminium bath temperature was 740 ℃ when wherein aluminium was bathed, and when adding heat diffusion treatment, the temperature of air-heating furnace is 950 ℃, and the time of heat diffusion treatment DIFFUSION TREATMENT is 5 hours.
Claims (4)
1, a kind of method of coating crucible surface, it may further comprise the steps:
(1), Steel Crucible is soaked rust cleaning with dilute hydrochloric acid, water is rinsed well then;
(2), crucible is immersed in carries out oil removing in the acetone soln;
(3), in acetone, soaked after, take out and to put into the mobile tap water once more and wash, bright and clean to crucible surface;
(4), Steel Crucible is put into used NaNO
3, CrO
3And KMnO
4Soak in the mixed aqueous solution of preparation;
(5), crucible puts into the molten aluminium that is melted into commercial-purity aluminium and carries out aluminium and bathe, take out crucible then and cool off;
(6), crucible put into air-heating furnace add heat diffusion treatment, come out of the stove then, be placed on that cooling gets final product in the air.
2, the method for a kind of coating crucible surface according to claim 1, the aluminium bath temperature was 720-760 ℃ when wherein aluminium was bathed, crucible soaks in aluminium is bathed and crosses 20-50 minute, after the surface forms even, the bright aluminized coating of one deck, takes out crucible and cools off.
3, the method for a kind of coating crucible surface according to claim 1, when wherein adding heat diffusion treatment, the temperature of air-heating furnace is 900-980 ℃, the time of heat diffusion treatment DIFFUSION TREATMENT is 4-6 hour.
4, the method for a kind of coating crucible surface according to claim 1, NaNO in the wherein said mixed aqueous solution
3, CrO
3And KMnO
4Mass percent concentration be respectively 0 4%, 0.2%, 0.05%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910272308A CN101671807A (en) | 2009-09-30 | 2009-09-30 | Method for coating crucible surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910272308A CN101671807A (en) | 2009-09-30 | 2009-09-30 | Method for coating crucible surface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101671807A true CN101671807A (en) | 2010-03-17 |
Family
ID=42019220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910272308A Pending CN101671807A (en) | 2009-09-30 | 2009-09-30 | Method for coating crucible surface |
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| Country | Link |
|---|---|
| CN (1) | CN101671807A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103276348A (en) * | 2013-06-08 | 2013-09-04 | 上海汇森益发工业炉有限公司 | Aluminized structure of structural member in nitriding furnace, and construction method thereof |
| CN107641785A (en) * | 2017-10-12 | 2018-01-30 | 河北工业大学 | A kind of spheroidal graphite cast-iron surface wearable coating preparation method |
| CN115216777A (en) * | 2022-06-09 | 2022-10-21 | 长江师范学院 | Surface iron removal process of carbon steel crucible for smelting magnesium alloy |
-
2009
- 2009-09-30 CN CN200910272308A patent/CN101671807A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103276348A (en) * | 2013-06-08 | 2013-09-04 | 上海汇森益发工业炉有限公司 | Aluminized structure of structural member in nitriding furnace, and construction method thereof |
| CN107641785A (en) * | 2017-10-12 | 2018-01-30 | 河北工业大学 | A kind of spheroidal graphite cast-iron surface wearable coating preparation method |
| CN115216777A (en) * | 2022-06-09 | 2022-10-21 | 长江师范学院 | Surface iron removal process of carbon steel crucible for smelting magnesium alloy |
| CN115216777B (en) * | 2022-06-09 | 2023-11-17 | 长江师范学院 | Surface iron removal process of carbon steel crucible for magnesium alloy smelting |
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Open date: 20100317 |