Protective agent for magnesium alloy melt pouring, magnesium alloy casting and preparation method thereof

A protective agent and magnesium alloy technology, applied in the field of magnesium alloys, can solve the problems of ineffective protection of magnesium alloys and performance degradation of formed magnesium alloy castings, and achieve the effects of good protection, performance improvement and compactness

Active Publication Date: 2022-01-28
HEBEI GANGYAN DEKAI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the defect that the protective agent for pouring in the prior art cannot effectively protect the magnesium alloy, which leads to a decrease in the performance of the formed magnesium alloy casting. Provided are a protective agent for pouring magnesium alloy melts, magnesium alloy castings and a preparation method thereof. The protective agent is used in the preparation of magnesium alloy castings and can form compact multi-layer protection for effective protection; and can avoid magnesium alloy Oxidation and combustion of alloys; it can also ensure the purity of magnesium alloy castings and improve the performance of magnesium alloy castings, especially the purity of magnesium

Method used

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  • Protective agent for magnesium alloy melt pouring, magnesium alloy casting and preparation method thereof
  • Protective agent for magnesium alloy melt pouring, magnesium alloy casting and preparation method thereof
  • Protective agent for magnesium alloy melt pouring, magnesium alloy casting and preparation method thereof

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preparation example Construction

[0039] In a second aspect, the present invention provides a method for preparing a magnesium alloy casting, comprising casting a magnesium alloy melt, and introducing the protective agent described in the first aspect before and / or during the casting.

[0040] The protective agent of the present invention can be introduced before and / or during the pouring according to actual needs, as long as it can protect the magnesium alloy melt, so as to ensure the quality of the magnesium alloy casting. Preferably, most of the protective agent is introduced before the casting, and an appropriate amount of protective agent is introduced during the casting process.

[0041] It can be understood that since the magnesium alloy melt has a relatively high temperature (generally around 700° C.), the protective agent will melt quickly after being introduced to form a protective layer.

[0042]The present invention does not have any limitation on the time of adding before the pouring, as long as i...

Embodiment 1

[0050] The protective agent of the invention is used to cast ZM5 alloy aviation bearings.

[0051] The material composition is ZM5 alloy, and its details are shown in Table 1.

[0052] Table 1

[0053]

[0054] Use the above materials to carry out the following smelting:

[0055] 1. Charge melting

[0056] Preheat the crucible to dark red, preheat the charge (namely the above materials) to above 200°C, and dry the flux (RJ-2) and modifier (hexachloroethane) at 140°C for 1.5h.

[0057] Sprinkle RJ-2 flux on the bottom of the crucible, add master alloy ingots, magnesium ingots, recycled materials, etc. in the preheated furnace materials, and heat up to melt.

[0058] After the charge is fully melted, adjust the temperature to 720°C, add the intermediate alloy and zinc ingot in the charge, and stir for 5 minutes after the charge is fully melted.

[0059] 2. Deterioration treatment

[0060] Adjust the temperature to 750°C, add 0.7wt% hexachloroethane for modification treat...

Embodiment 2

[0082] Carry out as in Example 1, the difference is that the proportions of the protective agents used are different, specifically, the mass ratio of sulfur and boric anhydride is 50:50, and the others are the same as in Example 1.

[0083] The surface of the obtained magnesium alloy casting is smooth and clean, and there is no oxidation and burning phenomenon in the melting process. After testing, the metallurgical quality meets the requirements of aviation standard HB7780-2005 Class I castings, and there is no inclusion (slag) in X-ray perspective.

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Abstract

The invention belongs to the technical field of magnesium alloy, and particularly relates to a protective agent for magnesium alloy melt pouring, a magnesium alloy casting and a preparation method thereof. The protective agent for magnesium alloy melt pouring comprises boric anhydride and sulfur; the mass content of the boric anhydride accounts for 30-60% of the total amount of the protective agent, and the mass content of the sulfur accounts for 40-70% of the total amount of the protective agent. According to the protective agent, the thickness of a multi-layer protective layer formed during pouring is increased, and the compactness of a single protective layer is also improved, so that a magnesium alloy melt is well protected, the purity of a magnesium alloy casting prepared from the magnesium alloy melt is guaranteed, the performance of the magnesium alloy casting is improved, and the metallurgical quality is excellent; and oxidation combustion of magnesium alloy can be avoided.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloys, and in particular relates to a protective agent for pouring magnesium alloy melts, a magnesium alloy casting and a preparation method thereof. Background technique [0002] The smelting and preparation process of magnesium alloy is generally divided into several stages: charging and melting, modification treatment, refining, fracture inspection and pouring, and solidification and forming. And because the magnesium alloy is very active, it is easy to generate oxidation reaction heat with oxygen in the molten state, forming oxidized slag, and the reaction product magnesium oxide is a non-dense film, so that the reaction between magnesium and oxygen continues to occur; therefore, it is necessary to Magnesium alloys are protected separately in melting, refining and pouring stages. In the melting stage, RJ series (such as RJ-2) fluxes are usually added; in the refining stage, refining fluxes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D1/00B22D21/04
CPCB22D1/00B22D21/04
Inventor 邵冲吴海龙杨武强朱小平邢长勇张国驰王子阳莫雪妍贾林玥王凯
Owner HEBEI GANGYAN DEKAI TECH CO LTD
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