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Flux for heat resistant magnesium alloy

A technology of magnesium alloy and flux, which is applied in the field of flux for heat-resistant magnesium alloy, can solve the problems of unsatisfactory heat-resistant magnesium alloy, reduced yield of alloy elements, harmful environment, etc., and achieves low production cost, strong slagging ability, The effect of increasing production costs

Active Publication Date: 2008-07-02
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The commonly used flux in the melting process of magnesium alloy is MgCl 2 - KCl mixed molten salt system, the physical and chemical properties of this system can meet the requirements of magnesium and common alloy melting, but cannot meet the requirements of heat-resistant magnesium alloys, because of its main component MgCl 2 It will chemically react with heat-resistant alloy elements, which will greatly reduce the yield of alloy elements
Although there is currently no MgCl-free smelting for rare earth element magnesium alloys 2 RJ-6 brand flux, but this brand flux contains 14-16 (mass)% BaCl 2 , although BaCl 2 Good weighting agent, but harmful to the environment due to its toxicity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Composition and mass percentage of heat-resistant magnesium alloy covering agent: KCl: 55%; NaCl: 10%; CaF 2 : 5%; Na 3 AlF 6 : 5%, CaCl 2 :20%; MgCO 3 : 5%.

[0015] Preparation process: The iron crucible is heated to about 300℃, and the pre-weighed and uniformly mixed KCl; NaCl; CaF 2 ; Na 3 AlF 6 ; CaCl 2 , Add the crucible, continue to heat up, after the mixture is completely melted, heat up to 740-750°C, stir evenly, and let it stand for about 10 minutes so that there is no obvious gas overflow in the melt and it is poured into a block. Crush with a grinder, sieving with a 0.6mm sieve, and add powdered CaF respectively 2 , Mix well, and seal and pack separately.

[0016] When smelting heat-resistant magnesium alloys, when the crucible is heated to 200~250℃, put 2%~5(wt)% of the bulk flux on the bottom of the crucible, add the main alloy elements, and add 3% MgCO to the sealed powder flux 3 Mix it evenly and sprinkle it on the surface of the alloy at a rate of 2% to 3% ...

Embodiment 2

[0018] Component and mass percentage of heat-resistant magnesium alloy refining agent: KCl: 50%; NaCl: 10%; CaF 2 : 10%; NaAlF 6 :15%; CaCl 2 : 15%.

[0019] Preparation process: The iron crucible is heated to about 300℃, and the pre-weighed and uniformly mixed KCl; NaCl; CaF 2 ; NaAlF 6 ; CaCl 2 , Add the crucible, continue to heat up, after the mixture is completely melted, heat up to 740-750°C, stir evenly, and let it stand for about 10 minutes so that there is no obvious gas overflow in the melt and it is poured into a block. Crush with a grinder, sieving with a 0.355mm sieve, and add powdered CaF 2 , Mix well and seal the package.

[0020] When smelting heat-resistant magnesium alloys, first protect the alloy according to Example 1 during the melting process to prevent the alloy from oxidizing and burning during the melting process. When the main elements and alloy elements of the alloy are all melted, the temperature is increased to about 740-750°C. The alloy undergoes refin...

Embodiment 3

[0022] Component and mass percentage of heat-resistant magnesium alloy covering agent: KCl:: 47%; NaCl:: 10%; CaF 2 : 5%; NaAlF 6 : 15%, CaCl 2 : 20%; H 3 BO 4 : 3%.

[0023] Preparation process: The iron crucible is heated to about 300℃, and the pre-weighed and uniformly mixed KCl; NaCl; CaF 2 ; NaAlF 6 ; CaCl 2 , Add the crucible, continue to heat up, after the mixture is completely melted, heat up to 740-750°C, stir evenly, and let it stand for about 10 minutes so that there is no obvious gas overflow in the melt and it is poured into a block. Crush with a grinder, sieving with a 0.355mm sieve, and add powdered CaF 2 , Mix well and seal the package.

[0024] In the process of smelting heat-resistant magnesium alloy, after melting and refining the alloy according to Example 1 and Example 2, it is allowed to stand and cool to about 710°C for casting. In the casting process, in order to prevent the alloy from oxidizing, the alloy prepared by this example Powder flux and 3% H 3 BO ...

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Abstract

The present invention relates to a flux for heat-resistant magnesium alloy. It is used for melt protection in the course of smelting heat-resistant magnesium alloy. It is characterized by that its composition includes (by wt%) 5%-10% of NaCl, 5%-12% of CaF2, 5%-15% of Na3AlF6, 10%-20% of CaCl2, 0%-5% of MgCO3, 0%-3% of H3BO4 and the rest is Kcl.

Description

Technical field [0001] The invention relates to a flux for a heat-resistant magnesium alloy, which is applied to melt protection in the process of heat-resistant magnesium alloy melting, impurity removal of the melt, and slag formation. technical background [0002] Magnesium is the lightest metal structural material in practical applications. It has the characteristics of low density, higher specific strength than rigidity, excellent electrical and thermal conductivity, good electromagnetic shielding and recyclability. It is considered to be ideal for plastics, steel and aluminum alloy materials. replacement product. [0003] Heat-resistant magnesium alloys were first mainly used in the defense industry and aerospace fields. In recent years, with the requirements of automobile weight reduction, the application of automobile transmission systems has become a huge driving force for its expansion. [0004] Magnesium is a very active metal and has a great affinity for oxygen. The co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/06
Inventor 姚素娟褚丙武周远富梁冬梅赵群
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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