CN102517457A - Method utilizing graphite-clay crucible to smelt magnesium or magnesium alloy - Google Patents
Method utilizing graphite-clay crucible to smelt magnesium or magnesium alloy Download PDFInfo
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- CN102517457A CN102517457A CN2011104545456A CN201110454545A CN102517457A CN 102517457 A CN102517457 A CN 102517457A CN 2011104545456 A CN2011104545456 A CN 2011104545456A CN 201110454545 A CN201110454545 A CN 201110454545A CN 102517457 A CN102517457 A CN 102517457A
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- clay crucible
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Abstract
The invention discloses a method utilizing a graphite-clay crucible to smelt magnesium or magnesium alloy, which includes steps of (1), preparing a coating according the formula including 100-400g/L of filling agent, 5-55g/L of sodium silicate and the balance water, and particularly mixing the sodium silicate, the water and the filling agent which can be calcium carbonate powder or magnesium carbonate powder of the granularity ranging from 100 meshes to 400 meshes to prepare the coating; (2) after preheating the graphite-clay crucible to be 100-300 DEG C in a heating furnace, painting or spraying the inner wall of the graphite-clay crucible with the coating prepared in the step (1); (3), repeating the step (2) by twice or three times; and (4) feeding magnesium or magnesium alloy blocks into the graphite-clay crucible of which the inner wall is painted or sprayed with the coating and then smelting the magnesium or magnesium alloy blocks. The graphite-clay crucible can be used for smelting of magnesium or magnesium alloy, chemical reaction between magnesium or magnesium alloy with components of the crucible during smelting is avoided, impurity elements caused by the chemical reaction can be prevented from entering melts, quality of magnesium or magnesium alloy is improved, cracking of the graphite-clay crucible is avoided, the service life of the graphite-clay crucible is prolonged, and cost for smelting magnesium or magnesium alloy is reduced.
Description
Technical field
The present invention relates to the smelting technique of magnesium or magnesiumalloy, improve magnesium or magnesium-alloy material quality, reduce magnesium or magnesiumalloy founding cost.
Background technology
Because the Fe element can significantly reduce the solidity to corrosion of magnesium or magnesiumalloy, the content of Fe element has strict restriction in magnesium or the magnesiumalloy.Steel crucibles is mainly used in the melting of magnesium or magnesiumalloy for a long time.It is following to use steel crucibles melting magnesium or magnesiumalloy to be difficult to make the Fe constituent content reach limiting the quantity of of magnesium or magnesiumalloy standard code.In addition, oxidation and scaling loss during owing to high temperature are used steel crucibles melting magnesium or magnesiumalloy, and the work-ing life of crucible is low.The paint coating on the steel crucibles surface, because the coefficient of expansion of coating and steel differs greatly, coating is easy to come off during melting, can not fine protection crucible.Though use silicon carbide crucible or pure plumbago crucible melting magnesium or magnesiumalloy can avoid Fe and other impurity element to get into, the cost of crucible is very high.In addition, under atmospheric environment, use pure plumbago crucible, the crucible scaling loss is very fast, and work-ing life is short.
The graphite clay crucible adds 40 ~ 50% graphite by clay and a small amount of other additives are processed, and is cheap, and the series product of different size are arranged, and is mainly used in the melting of metals such as copper, aluminium, zinc and alloy thereof.
The activity of magnesium elements is very big; Directly use graphite clay crucible melting magnesium or magnesiumalloy, chemical reaction can take place with clay in the crucible etc. in the magnesium melt, and its result can make crucible damage and cracking; And cause that bath composition changes; Therefore, in scientific research and industrial production, magnesium or magnesium alloy smelting do not use the graphite clay crucible.
Summary of the invention
The objective of the invention is to make graphite clay crucible cheaply to be used for the melting of magnesium or magnesiumalloy; Be employed in that graphite clay crucible inwall whitewashes or the method for sprayed coating; Utilize coating in heat-processed, to be decomposed into product stable in liquid magnesium or magnesiumalloy; These degradation productions can firmly depend on the sidewall of crucible, shield.
Technical scheme of the present invention is: use the method for graphite clay crucible melting magnesium or magnesiumalloy, its step is following:
(1) preparation coating, prescription is weighting agent 100 ~ 400g/L, water glass 5 ~ 55g/L, and all the other are water, process coating after weighting agent, water glass and water are mixed, and weighting agent is that granularity is 100 ~ 400 purpose lime carbonate powders or magnesiumcarbonate powder;
(2) the graphite clay crucible is preheated to 100 ~ 300 ℃ in process furnace after, evenly whitewash or spray inwall with the coating in the step (1);
(3) step (2) is repeated two to three times;
(4) magnesium or magnesiumalloy piece material are put into the graphite clay crucible that inwall whitewashes or spray and carry out melting.
In the said step (2) with the graphite clay crucible in process furnace before the preheating, to the crucible inner wall cleaning.
The invention has the beneficial effects as follows: the present invention makes the graphite clay crucible can be used for the melting of magnesium or magnesiumalloy; Avoided magnesium or magnesiumalloy when melting and the chemical reaction between the crucible moity and the impurity element that causes therefrom get into melt; Improve magnesium or magnesiumalloy quality; And avoid the crucible cracking, and prolonged pot life, reduce the melting cost of magnesium or magnesiumalloy.
Embodiment
Embodiment 1
Use the method for graphite clay crucible melting magnesium or magnesiumalloy, its step is following:
(1) preparation coating, prescription is 100 purpose lime carbonate powder 100g/L, water glass 5g/L, all the other are water, process coating after weighting agent, water glass and water are mixed;
(2) the graphite clay crucible is preheated to 100 ℃ in process furnace after, evenly whitewash or spray inwall with the coating in the step (1);
(3) step (2) is repeated twice;
(4) magnesium or magnesiumalloy piece material are put into the graphite clay crucible that inwall whitewashes or spray and carry out melting.
20# graphite clay crucible directly is used for melting magnesium or magnesiumalloy.Sidewall of crucible is swabbing not, 720 to 800 ℃ of melting use temperatures.After using for the third time, because high temperature is following and the magnesium fusant reaction, the crucible cracking.According to the present embodiment method, 720 to 800 ℃ of crucible for smelting use temperatures, after crucible used tens of times, profile was complete, and intensity is still very high.
Embodiment 2
Use the method for graphite clay crucible melting magnesium or magnesiumalloy, its step is following:
(1) preparation coating, prescription is that granularity is 400 purpose magnesiumcarbonate powder 400g/L, water glass 55g/L, all the other are water, process coating after weighting agent, water glass and water are mixed;
(2) the graphite clay crucible is preheated to 300 ℃ in process furnace after, evenly whitewash or spray inwall with the coating in the step (1);
(3) step (2) is repeated three times;
(4) magnesium or magnesiumalloy piece material are put into the graphite clay crucible that inwall whitewashes or spray and carry out melting.
16# graphite clay crucible, according to the method for present embodiment, 720 to 800 ℃ of crucible for smelting use temperatures.Crucible repeatedly back does not have cracking, and profile is complete, and intensity is high.
Embodiment 3
Use the method for graphite clay crucible melting magnesium or magnesiumalloy, its step is following:
(1) preparation coating, prescription is weighting agent 200g/L, water glass 40g/L, and all the other are water, process coating after weighting agent, water glass and water are mixed, and weighting agent is that granularity is 200 purpose lime carbonate powders or magnesiumcarbonate powder;
(2) the graphite clay crucible is preheated to 200 ℃ in process furnace after, evenly whitewash or spray inwall with the coating in the step (1);
(3) step (2) is repeated two to three times;
(4) magnesium or magnesiumalloy piece material are put into the graphite clay crucible that inwall whitewashes or spray and carry out melting.
Embodiment 4
Use the method for graphite clay crucible melting magnesium or magnesiumalloy, its step is following:
(1) preparation coating, prescription is weighting agent 100 ~ 400g/L, water glass 5 ~ 55g/L, and all the other are water, process coating after weighting agent, water glass and water are mixed, and weighting agent is that granularity is 100 ~ 400 purpose lime carbonate powders or magnesiumcarbonate powder;
(2) the graphite clay crucible is preheated to 100 ~ 300 ℃ in process furnace after, evenly whitewash or spray inwall with the coating in the step (1);
(3) step (2) is repeated two to three times;
(4) magnesium or magnesiumalloy piece material are put into the graphite clay crucible that inwall whitewashes or spray and carry out melting.
Claims (2)
1. use the method for graphite clay crucible melting magnesium or magnesiumalloy, it is characterized in that: its step is following:
(1) preparation coating, prescription is weighting agent 100 ~ 400g/L, water glass 5 ~ 55g/L, and all the other are water, process coating after weighting agent, water glass and water are mixed, and weighting agent is that granularity is 100 ~ 400 purpose lime carbonate powders or magnesiumcarbonate powder;
(2) the graphite clay crucible is preheated to 100 ~ 300 ℃ in process furnace after, evenly whitewash or spray inwall with the coating in the step (1);
(3) step (2) is repeated two to three times;
(4) magnesium or magnesiumalloy piece material are put into the graphite clay crucible that inwall whitewashes or spray and carry out melting.
2. the method for use graphite clay crucible melting magnesium according to claim 1 or magnesiumalloy is characterized in that: in the said step (2) with the graphite clay crucible in process furnace before the preheating, to the crucible inner wall cleaning.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104545456A CN102517457B (en) | 2011-12-30 | 2011-12-30 | Method for utilizing graphite-clay crucible to smelt magnesium or magnesium alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104545456A CN102517457B (en) | 2011-12-30 | 2011-12-30 | Method for utilizing graphite-clay crucible to smelt magnesium or magnesium alloy |
Publications (2)
| Publication Number | Publication Date |
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| CN102517457A true CN102517457A (en) | 2012-06-27 |
| CN102517457B CN102517457B (en) | 2013-12-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011104545456A Expired - Fee Related CN102517457B (en) | 2011-12-30 | 2011-12-30 | Method for utilizing graphite-clay crucible to smelt magnesium or magnesium alloy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110644000A (en) * | 2019-10-25 | 2020-01-03 | 长江师范学院 | Crucible treatment method, smelting container and application thereof |
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| CN1048751A (en) * | 1990-07-17 | 1991-01-23 | 天津大学 | Metallic crucible made of anticorrosion composite material |
| WO1997043060A1 (en) * | 1996-05-13 | 1997-11-20 | Alliedsignal Inc. | Inert calcia facecoats for investment casting of titanium and titanium-aluminide alloys |
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| CN101008060A (en) * | 2006-11-30 | 2007-08-01 | 中国科学院长春应用化学研究所 | Heat-proof magnesium-base rare earth alloy and its preparation method |
| CN101144134A (en) * | 2007-10-15 | 2008-03-19 | 李贞宽 | Aluminum-silicon series deforming alloy and manufacturing method thereof |
| CN101191168A (en) * | 2006-11-23 | 2008-06-04 | 北京有色金属研究总院 | Magnesium alloy and preparation method thereof |
| CN101255518A (en) * | 2008-05-21 | 2008-09-03 | 中国科学院长春应用化学研究所 | High-strength antirusting Mg-Al-Mn die-casting magnesium alloy containing yttrium-rich rare earth |
| CN101269449A (en) * | 2008-05-05 | 2008-09-24 | 太原理工大学 | Method for manufacturing high-strength magnesium alloy solder wire |
| CN101289721A (en) * | 2008-06-18 | 2008-10-22 | 重庆大学 | High manganese-containing magnesium-manganese intermediate alloy and preparation |
| CN201140319Y (en) * | 2008-01-18 | 2008-10-29 | 武汉金泉铝热焊接器材有限公司 | Disposal crucible |
| CN101508590A (en) * | 2009-03-20 | 2009-08-19 | 江西赛维Ldk太阳能高科技有限公司 | Crucible pot coating for polysilicon casting ingot and preparation method |
-
2011
- 2011-12-30 CN CN2011104545456A patent/CN102517457B/en not_active Expired - Fee Related
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1048751A (en) * | 1990-07-17 | 1991-01-23 | 天津大学 | Metallic crucible made of anticorrosion composite material |
| WO1997043060A1 (en) * | 1996-05-13 | 1997-11-20 | Alliedsignal Inc. | Inert calcia facecoats for investment casting of titanium and titanium-aluminide alloys |
| CN2396357Y (en) * | 1999-12-02 | 2000-09-13 | 徐定楷 | Graphite crucible |
| CN1310325A (en) * | 2000-02-25 | 2001-08-29 | 中国科学院金属研究所 | Magnesia crucible with calcium oxide coating and its making process |
| CN101191168A (en) * | 2006-11-23 | 2008-06-04 | 北京有色金属研究总院 | Magnesium alloy and preparation method thereof |
| CN101008060A (en) * | 2006-11-30 | 2007-08-01 | 中国科学院长春应用化学研究所 | Heat-proof magnesium-base rare earth alloy and its preparation method |
| CN101144134A (en) * | 2007-10-15 | 2008-03-19 | 李贞宽 | Aluminum-silicon series deforming alloy and manufacturing method thereof |
| CN201140319Y (en) * | 2008-01-18 | 2008-10-29 | 武汉金泉铝热焊接器材有限公司 | Disposal crucible |
| CN101269449A (en) * | 2008-05-05 | 2008-09-24 | 太原理工大学 | Method for manufacturing high-strength magnesium alloy solder wire |
| CN101255518A (en) * | 2008-05-21 | 2008-09-03 | 中国科学院长春应用化学研究所 | High-strength antirusting Mg-Al-Mn die-casting magnesium alloy containing yttrium-rich rare earth |
| CN101289721A (en) * | 2008-06-18 | 2008-10-22 | 重庆大学 | High manganese-containing magnesium-manganese intermediate alloy and preparation |
| CN101508590A (en) * | 2009-03-20 | 2009-08-19 | 江西赛维Ldk太阳能高科技有限公司 | Crucible pot coating for polysilicon casting ingot and preparation method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110644000A (en) * | 2019-10-25 | 2020-01-03 | 长江师范学院 | Crucible treatment method, smelting container and application thereof |
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| CN102517457B (en) | 2013-12-11 |
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