CN101135005B - Method for generating metal vacuum smelting protective gas - Google Patents
Method for generating metal vacuum smelting protective gas Download PDFInfo
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- CN101135005B CN101135005B CN2006102008287A CN200610200828A CN101135005B CN 101135005 B CN101135005 B CN 101135005B CN 2006102008287 A CN2006102008287 A CN 2006102008287A CN 200610200828 A CN200610200828 A CN 200610200828A CN 101135005 B CN101135005 B CN 101135005B
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- earth metal
- attitude
- gas
- high temperature
- simple substance
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Abstract
The present invention discloses method of creating protecting gas for vacuum metal smelting. The mixture of argon of 98 % over purity in 90-99.8 wt% and carbon powder in 0.2-10 wt% is sprayed to alkali earth metal at high temperature or in melt state to form protecting gas layer in the surface of alkali earth metal. Argon excludes oxygen in the air and carbon powder mixed inside argon reacts with oxygen inside the argon mixture to produce CO2, so as to avoid the surface oxidation of the alkali earth metal at high temperature or in melt state. The present invention replaces sulfur with the mixture of argon and carbon powder, and can avoid the oxygen of alkali earth metal, reduce the impurity content in metal melt and reduce environmental pollution. The protecting gas of the present invention has the features of use convenience, low cost and less environmental pollution. The present invention is suitable for smelting of alkali earth metal and its alloy, casting, etc.
Description
Technical field
The present invention relates to a kind of method that generates shielding gas, particularly relate to a kind of method that generates metal vacuum smelting protective gas.
Background technology
In production processes such as the smelting of alkaline-earth metal and alloy smelting thereof, casting, die casting, extruding, for avoid alkaline-earth metal at high temperature with oxygen (O
2) oxidation even burning take place, must make alkaline-earth metal and air isolated, in alkaline-earth metal smelting at present or the castingprocesses, use sulfurous gas (SO widely
2) gas or sulfur hexafluoride (SF
6) gas is as the shielding gas of alkaline-earth metal high temperature attitude or melt.At existing sulfurous gas (SO
2) in the gas shield technology, generally adopt to the metallic high temperature attitude or bath surface is manually shed or machinery sprays simple substance powder sulphur (S) and obtains sulfurous gas (SO
2), sulfurous gas (SO
2) can cause severe contamination to environment, also unfavorable to workers'health; At existing sulfur hexafluoride (SF
6) in the resist technology, sulfur hexafluoride (SF
6) cost an arm and a leg, cause product cost high, simultaneously sulfur hexafluoride (SF
6) also be to belong to greenhouse gases, also can have a negative impact to environment.
Summary of the invention
The objective of the invention is to, a kind of method that generates metal vacuum smelting protective gas is provided.This method both can effectively prevent the oxidation of alkaline-earth metal and stop burning, reduce the foreign matter content of metal melt; Can reduce pollution again to environment.
Technical scheme of the present invention: a kind of method that generates metal vacuum smelting protective gas, be characterized in: with the purity of mass ratio 90～99.8% argon gas 98% or more and the mixture of the simple substance powder carbon formation of mass ratio 0.2～10%, to the alkaline-earth metal jet surface of high temperature attitude or melt attitude, form the gas shield layer on the alkaline-earth metal surface of high temperature attitude or solution attitude; With the oxygen in the argon gas secluding air, the simple substance powder carbon that is blended in the argon gas at high temperature reacts with the oxygen that is blended in the argon gas, generates carbonic acid gas, has avoided the oxidation on high temperature attitude or melt attitude alkaline-earth metal surface effectively.
In the method for above-mentioned generation metal vacuum smelting protective gas, described mixture is the argon gas of purity more than 99% and the simple substance powder carbon formation of mass ratio 0.5～2% with mass ratio 98～99.5%.
In the method for aforesaid generation metal vacuum smelting protective gas, simple substance powder carbon is granularity 100～200 purpose simple substance powder carbon.
In the method for aforesaid generation metal vacuum smelting protective gas, along with the reduction of the alkaline-earth metal surface oxygen content of high temperature attitude or solution attitude, the add-on of simple substance powder carbon can reduce or cancel.
Compared with prior art, the present invention argon gas (Ar
2) and the mixture that constitutes of simple substance powder carbon (C) replace with serious pollution manually shed or machinery sprays simple substance powder sulphur (S) resist technology and the high sulfur hexafluoride (SF of price
6) resist technology, the hybrid protection gas of formation is argon gas (Ar
2) and carbonic acid gas (CO
2).Both can effectively prevent or stop the oxidation and the burning of alkaline-earth metal, help reducing the foreign matter content of metal melt; Can reduce pollution again to environment.The shielding gas that adopts the present invention to generate has characteristics easy to use, with low cost, that environmental pollution is little.The present invention is applicable to productions such as the smelting of alkaline-earth metal and alloy smelting thereof, casting, die casting, extruding.
Embodiment
Embodiment.Generating the method for metal vacuum smelting protective gas, is 99% argon gas (Ar with 96% purity
2) and 4% granularity be the mixture of 200 purpose simple substance powder carbon (C), spray or spray to the alkaline-earth metal of high temperature attitude or melt attitude surface, form the gas shield layer on the alkaline-earth metal surface of high temperature attitude or solution attitude; Oxygen in the argon gas secluding air is blended in simple substance powder carbon (C) and the metallic surface that is distributed in high temperature attitude or melt attitude oxygen generation chemical reaction on every side in the argon gas, generates carbonic acid gas (CO
2) gas, consume high temperature attitude or melt attitude metallic surface oxygen (O on every side
2), reach the purpose that fire-resisting protection reaches anti-oxidation, because argon gas (Ar
2) molecular weight greater than the molecular-weight average of air, argon gas (Ar
2) distributing is positioned at the high temperature attitude or the melt attitude metallic surface of gas bottom, has completely cut off oxygen (O
2), played fire-resisting protection and anti-oxidation to high temperature attitude or melt attitude metallic surface.When the oxygen level of high temperature attitude or melt attitude metallic surface reduces (by the oxygen measuring apparatus test), can according to circumstances reduce or cancel the add-on of powder carbon (C), reduce carbonic acid gas (CO
2) the generation total amount of gas, alkaline earth melt melting and casting under present method protection helps reducing the foreign matter content of metal melt.The present invention argon gas (Ar
2) and the mixture that constitutes of simple substance powder carbon (C) replace with serious pollution manually shed or machinery sprays simple substance powder sulphur (S) resist technology and the high sulfur hexafluoride (SF of price
6) resist technology, the hybrid protection gas of formation is argon gas (Ar
2) and carbonic acid gas (CO
2), its application conditions is same as the prior art.
Claims (2)
1. method that generates metal vacuum smelting protective gas, it is characterized in that: with the purity of mass ratio 90～99.8% argon gas 98% or more and the mixture of the simple substance powder carbon formation of mass ratio 0.2～10%, to the alkaline-earth metal jet surface of high temperature attitude or melt attitude, form the gas shield layer on the alkaline-earth metal surface of high temperature attitude or solution attitude; With the oxygen in the argon gas secluding air, the simple substance powder carbon that is blended in the argon gas at high temperature reacts with the oxygen that is blended in the argon gas, generates carbonic acid gas, has avoided the oxidation on high temperature attitude or melt attitude alkaline-earth metal surface effectively; Described simple substance powder carbon is granularity 100～200 purpose simple substance powder carbon; Along with the reduction of oxygen level in the alkaline-earth metal surface protection gas of high temperature attitude or solution attitude, the add-on of simple substance powder carbon reduces or cancellation.
2. the method for generation metal vacuum smelting protective gas according to claim 1 is characterized in that: described mixture is the argon gas of purity more than 99% and the simple substance powder carbon formation of mass ratio 0.5～2% with mass ratio 98～99.5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006102008287A CN101135005B (en) | 2006-08-28 | 2006-08-28 | Method for generating metal vacuum smelting protective gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006102008287A CN101135005B (en) | 2006-08-28 | 2006-08-28 | Method for generating metal vacuum smelting protective gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101135005A CN101135005A (en) | 2008-03-05 |
| CN101135005B true CN101135005B (en) | 2011-03-23 |
Family
ID=39159329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006102008287A Expired - Fee Related CN101135005B (en) | 2006-08-28 | 2006-08-28 | Method for generating metal vacuum smelting protective gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101135005B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1446649A (en) * | 2002-12-16 | 2003-10-08 | 重庆大学 | Mixture utilized to generate gas for protecting magnesium alloy in reaction |
| CN1587425A (en) * | 2004-07-08 | 2005-03-02 | 上海交通大学 | Magnesium alloy smelting method using difluoromethane as protective atmosphere |
| CN1651840A (en) * | 2005-03-29 | 2005-08-10 | 清华大学 | Mg alloy vacuum sealing smelter and method for preventing Mg alloy from oxidation burning |
-
2006
- 2006-08-28 CN CN2006102008287A patent/CN101135005B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1446649A (en) * | 2002-12-16 | 2003-10-08 | 重庆大学 | Mixture utilized to generate gas for protecting magnesium alloy in reaction |
| CN1587425A (en) * | 2004-07-08 | 2005-03-02 | 上海交通大学 | Magnesium alloy smelting method using difluoromethane as protective atmosphere |
| CN1651840A (en) * | 2005-03-29 | 2005-08-10 | 清华大学 | Mg alloy vacuum sealing smelter and method for preventing Mg alloy from oxidation burning |
Non-Patent Citations (1)
| Title |
|---|
| JP昭62-287011A 1987.12.12 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101135005A (en) | 2008-03-05 |
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Granted publication date: 20110323 Termination date: 20140828 |
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