CN106435316A - Flame-resistant Mg-Nd magnesium alloy and casting method for sand casting thereof - Google Patents

Flame-resistant Mg-Nd magnesium alloy and casting method for sand casting thereof Download PDF

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Publication number
CN106435316A
CN106435316A CN201610934108.7A CN201610934108A CN106435316A CN 106435316 A CN106435316 A CN 106435316A CN 201610934108 A CN201610934108 A CN 201610934108A CN 106435316 A CN106435316 A CN 106435316A
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China
Prior art keywords
magnesium alloy
casting
fire
cast
sand
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Pending
Application number
CN201610934108.7A
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Chinese (zh)
Inventor
陈舸
李中权
孔振
李宝辉
肖旅
沈义平
王先飞
杨旭东
沙卫彪
计来华
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Shanghai Space Precision Machinery Research Institute
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Shanghai Space Precision Machinery Research Institute
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Priority to CN201610934108.7A priority Critical patent/CN106435316A/en
Publication of CN106435316A publication Critical patent/CN106435316A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/02Making alloys by melting
    • C22C1/03Making alloys by melting using master alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/06Making alloys with the use of special agents for refining or deoxidising
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C23/00Alloys based on magnesium
    • C22C23/06Alloys based on magnesium with a rare earth metal as the next major constituent
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/06Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon

Abstract

The invention belongs to the technical field of non-ferrous alloy casting, and discloses a flame-resistant Mg-Nd magnesium alloy and a casting method for a sand casting of the flame-resistant Mg-Nd magnesium alloy. The magnesium alloy comprises the following components by weight: 0.2-0.7 percent of Zn, 0.4-1.0 percent of Zr, 2.0-2.8 percent of Nd, 0-3.0 percent of Ce, 0-3.0 percent of La, and the balance of Mg. The invention further discloses the casting method for the sand casting of the flame-resistant Mg-Nd magnesium alloy. Compared with the prior art, the flame-resistant Mg-Nd magnesium alloy has the advantages that the ignition point of the flame-resistant Mg-Nd magnesium alloy is effectively improved, so that the smelting, casting and cutting process of the flame-resistant Mg-Nd magnesium alloy is relatively safe, and the flame-resistant Mg-Nd magnesium alloy has a high comprehensive mechanical property, and is suitable for being popularized in the field of magnesium alloy casting.

Description

A kind of fire-retardant magnesium neodymium series magnesium alloy and its casting method of sand-cast
Technical field
The present invention relates to a kind of magnesium alloy of technical field of metal, specifically a kind of fire-retardant magnesium neodymium series magnesium alloy And its casting method of sand-cast.
Background technology
Magnesium alloy has the advantages that low-density, high specific strength, and magnesium neodymium series are the lightest metals in practical metal, extensively applies In industrial departments such as Aeronautics and Astronautics, transport, chemical industry, it is also widely used in portable apparatus and auto industry.And magnesium alloy In melting and machining process, the high feature of burning tendency governs it always and applies to wide range of areas.By to magnesium alloy The alloying elements such as middle interpolation rare earth, the raising of achievable magnesium alloy burning-point, it is directed to the fire-retardant aspect of magnesium alloy materials at present both at home and abroad Research because the difference of its addition element be divided into interpolation Ca, Be, Zn and this four big class of rare earth carry out
However, finding in practical application, with the addition of flame-retardant alloy element, magnesium neodymium series magnesium alloy burning-point steps up, but After addition reaches a certain marginal value, burning-point no longer rises, and has slow downward trend.Simultaneously as alloying element plus Enter to promote magnesium neodymium series magnesium alloy ontology element to generate such as the oxide layer such as MgO, CaO with air reaction, it is stoping magnesium alloy solution The mechanical property of foundry goods is reduced while with air reaction, and the larger fragility of foundry goods ontological existence, to fire-retardant magnesium neodymium series magnesium Alloy is totally unfavorable in the engineer applied of every field.Therefore, how to solve fire-retardant magnesium neodymium series magnesium alloy to improve and power in burning-point Learn performance both sides up to standard balance, both improved burning-point, by the fire-retardant magnesium neodymium series magnesium alloy that can guarantee that mechanical castings, It is the key improving its engineer applied level.
Currently without the explanation finding technology similar to the present invention or report, also not yet search the money being similar to both at home and abroad Material.
Content of the invention
It is an object of the invention to overcoming the deficiencies in the prior art, provide a kind of fire-retardant magnesium neodymium series magnesium alloy and its sand mold casting The manufacture method of part;Add rare earth element ce, La in described fire-retardant magnesium neodymium series magnesium alloy, solve melting in magnesium alloy air and pour Incendive problem is held during note;Adopt the Technology for Heating Processing for antiflaming magnesium alloy simultaneously, reduce the addition of alloying element Impact to magnesium alloy mechanical property.The processing such as melting, cast, heat treatment is carried out to the alloy of selected components, can achieve fire-retardant The performance fire-retardant magnesium neodymium series magnesium alloy all good with mechanical property.
The present invention is achieved by the following technical solutions:The present invention provides a kind of fire-retardant magnesium neodymium series magnesium alloy, comprises group Divide and percentage by weight is:Zn 0.2~0.7%, Zr 0.4~1.0%, Nd 2.0~2.8, Ce 0~3.0%, La 0~3.0%, Mg is surplus.
Another technical scheme of the present invention is, provides a kind of casting of the sand-cast of described fire-retardant magnesium neodymium series magnesium alloy Method, described casting method specifically includes following steps:
Pretreatment:Percentage by weight as described in claim 1 weighs metal material, preheating;
Smelting and pouring:By pretreated metal material melting, uniformly mix;Pour into a mould after covering, refining treatment, obtain foundry goods;
Heat treatment:Described foundry goods is carried out with solution treatment, cooling, Ageing Treatment, cooling, obtains final product the sand of fire-retardant magnesium neodymium series magnesium alloy Type foundry goods.
Preferably, in the step of pretreatment, the temperature of described preheating is 200 DEG C, and the time is 10 hours.
Preferably, in the step of smelting and pouring, the described coverture adopting that covers is JDMF.
Preferably, in the step of smelting and pouring, the refining agent that described refine adopts is JDMJ.
Preferably, in the step of smelting and pouring, the temperature of described cast is 690 DEG C~740 DEG C.
Preferably, in the step of heat treatment, the condition of described solution treatment is 15~18 hours at 540~550 DEG C.
Preferably, in the step of heat treatment, the condition of described Ageing Treatment is 20~35 hours at 170~200 DEG C.
Preferably, in the step of heat treatment, described cooling specifically refers to natural cooling in atmosphere.
Compared with prior art, removed using the sand-cast of the present invention fire-retardant magnesium neodymium series magnesium alloy manufacture and effectively improve magnesium neodymium Outside series magnesium alloy solution and foundry goods fire resistance, also there is good comprehensive mechanical property, meet GB1177-91《Casting magnesium Alloy》In requirement to magnesium neodymium series Mg alloy castings mechanical property.
Brief description
Fig. 1 is the casting method flow chart of the sand-cast of fire-retardant magnesium neodymium series magnesium alloy of the present invention.
Specific embodiment
Below embodiments of the invention are elaborated:The present embodiment is carried out under premised on technical solution of the present invention Implement, give detailed embodiment and process, but protection scope of the present invention is not limited to the conjunction that following embodiments are enumerated Golden composition.
Embodiment 1
Smelting and pouring prepares the fire-retardant magnesium neodymium that mass percent is Mg-0.4%Zn-0.75%Zr-2.5%Nd-1.5%La-1.0%Ce Series magnesium alloy, comprises the following steps:
Preparation raw material step:Weigh pure magnesium, pure zinc, Mg-Zr intermediate alloy, Mg-Nd intermediate alloy, Mg-La by mass percentage Intermediate alloy, Mg-Ce intermediate alloy.All raw material preheats at 200 DEG C, temperature retention time 10 hours.
Smelting and pouring step:Recommend to adopt crucible electrical resistance furnace melting, add coverture JDMF to carry out covering, refining agent JDMJ
Carry out refining treatment, so that each alloying component is uniformly mixed, removal of inclusions, poured into a mould at 740 DEG C.
Heat treatment step:At 540 DEG C, solution treatment is carried out to foundry goods, process time is 16 hours, air cooling;Enter at 185 DEG C Row Ageing Treatment, process time is 24 hours.
The sand-cast of the present embodiment fire-retardant magnesium neodymium series magnesium alloy manufacture possesses outstanding fire resistance, gas-protection-free shape 745 DEG C of magnesium alloy solution initiation temperature under state, single casting sample T6 state under room temperature:σb>=247MPa, δ5≥4.5%.
Embodiment 2
Smelting and pouring prepares the fire-retardant magnesium neodymium that mass percent is Mg-0.4%Zn-0.75%Zr-2.5%Nd-2.5%La-2.5%Ce Series magnesium alloy, comprises the following steps:
Preparation raw material step:Weigh pure magnesium, pure zinc, Mg-Zr intermediate alloy, Mg-Nd intermediate alloy, Mg-La by mass percentage Intermediate alloy, Mg-Ce intermediate alloy.All raw material preheats at 220 DEG C, temperature retention time 6 hours.
Smelting and pouring step:Recommend to adopt crucible electrical resistance furnace melting, add coverture JDMF to carry out covering, refining agent JDMJ Carry out refining treatment, so that each alloying component is uniformly mixed, removal of inclusions, poured into a mould at 740 DEG C.
Heat treatment step:At 550 DEG C, solution treatment is carried out to foundry goods, process time is 16 hours, air cooling;Enter at 175 DEG C Row Ageing Treatment, process time is 32 hours.
The sand-cast of the present embodiment fire-retardant magnesium neodymium series magnesium alloy manufacture possesses outstanding fire resistance, gas-protection-free shape 754 DEG C of magnesium alloy solution initiation temperature under state, single casting sample T6 state under room temperature:σb>=233MPa, δ5≥5.0%.
Comparative example 1
This comparative example is the comparative example of embodiment 1, and the present embodiment is related to a kind of fire-retardant magnesium neodymium series magnesium alloy;Different from embodiment 1 Part is only that described heat resistance casting magnesium alloy does not contain La, Ce;
The performance detection of the sand-cast that this comparative example magnesium alloy manufactures is as follows:
Magnesium alloy flame-proof performance is general, 660 DEG C of magnesium alloy solution initiation temperature, the no casting of casting flaw under gas-protection-free state Part body sampling performance can stably reach:Single casting sample T6 state under room temperature:σb>=235MPa, δ5≥3.0%.
Comparative example 2
This comparative example is the comparative example of embodiment 2, and the present embodiment is related to a kind of fire-retardant magnesium neodymium series magnesium alloy;Different from embodiment 2 Part is only that the condition of described heat resistance casting magnesium alloy solution treatment is 20 hours at 550 DEG C;The condition of Ageing Treatment is 200 18 hours at DEG C;
The performance detection of the sand-cast that this comparative example magnesium alloy manufactures is as follows:
Magnesium alloy flame-proof excellent performance, 754 DEG C of magnesium alloy solution initiation temperature, single casting sample under room temperature under gas-protection-free state T6 state:σb>=215MPa, δ5≥3.5%.
Above the specific embodiment of the present invention is described.It is to be appreciated that the invention is not limited in above-mentioned specific Embodiment, those skilled in the art can make various modifications or modification within the scope of the claims, and this has no effect on this The flesh and blood of invention.

Claims (9)

1. a kind of fire-retardant magnesium neodymium series magnesium alloy is it is characterised in that comprise component and percentage by weight is:
Zn 0.2~0.7%;
Zr 0.4~1.0%;
Nd 2.0~2.8;
Ce 0~3.0%;
La 0~3.0%;
Mg is surplus.
2. the sand-cast of fire-retardant magnesium neodymium series magnesium alloy described in a kind of claim 1 casting method it is characterised in that include as Lower step:
Pretreatment:Weigh metal material by weight percentage, preheating;
Smelting and pouring:By pretreated metal material melting, uniformly mix;Pour into a mould after covering, refining treatment, obtain foundry goods;
Heat treatment:Described foundry goods is carried out with solution treatment, cooling, Ageing Treatment, cooling, obtains final product the sand of fire-retardant magnesium neodymium series magnesium alloy Type foundry goods.
3. according to claim 2 the casting method of the sand-cast of fire-retardant magnesium neodymium series magnesium alloy it is characterised in that described pre- In the step processing, the temperature of described preheating is 200 DEG C, and the time is 10 hours.
4. according to claim 2 the casting method of the sand-cast of fire-retardant magnesium neodymium series magnesium alloy it is characterised in that described molten In the step of refining cast, the described coverture adopting that covers is JDMF.
5. according to claim 2 the casting method of the sand-cast of fire-retardant magnesium neodymium series magnesium alloy it is characterised in that described molten In the step of refining cast, the refining agent that described refine adopts is JDMJ.
6. according to claim 2 the casting method of the sand-cast of fire-retardant magnesium neodymium series magnesium alloy it is characterised in that described molten In the step of refining cast, the temperature of described cast is 690 DEG C~740 DEG C.
7. according to claim 2 the casting method of the sand-cast of fire-retardant magnesium neodymium series magnesium alloy it is characterised in that described heat In the step processing, the condition of described solution treatment is 15~18 hours at 540~550 DEG C.
8. according to claim 2 the casting method of the sand-cast of fire-retardant magnesium neodymium series magnesium alloy it is characterised in that described heat In the step processing, the condition of described Ageing Treatment is 20~35 hours at 170~200 DEG C.
9. according to claim 2 the casting method of the sand-cast of fire-retardant magnesium neodymium series magnesium alloy it is characterised in that described heat In the step processing, described cooling specifically refers to natural cooling in atmosphere.
CN201610934108.7A 2016-11-01 2016-11-01 Flame-resistant Mg-Nd magnesium alloy and casting method for sand casting thereof Pending CN106435316A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108642313A (en) * 2018-05-25 2018-10-12 哈尔滨吉星机械工程有限公司 A method of regenerating magnalium system magnesium alloy waste material using double rare earths
CN109295369A (en) * 2018-11-23 2019-02-01 上海交通大学 One kind magnesium alloy containing cerium mischmetal and its heat treatment method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2169090A1 (en) * 2008-09-30 2010-03-31 BIOTRONIK VI Patent AG Implant made of a biodegradable magnesium alloy
CN101787472A (en) * 2010-03-18 2010-07-28 上海交通大学 Heat-resistant forged magnesium-rare earth alloy and preparation method thereof
CN105200293A (en) * 2015-10-27 2015-12-30 上海航天精密机械研究所 High-performance heatproof cast magnesium alloy and casting method for sand casting prepared from cast magnesium alloy
CN105499297A (en) * 2016-01-23 2016-04-20 哈尔滨理工大学 Extrusion die combining forward extrusion and equal-channel corner extrusion and extrusion machining method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2169090A1 (en) * 2008-09-30 2010-03-31 BIOTRONIK VI Patent AG Implant made of a biodegradable magnesium alloy
CN101787472A (en) * 2010-03-18 2010-07-28 上海交通大学 Heat-resistant forged magnesium-rare earth alloy and preparation method thereof
CN105200293A (en) * 2015-10-27 2015-12-30 上海航天精密机械研究所 High-performance heatproof cast magnesium alloy and casting method for sand casting prepared from cast magnesium alloy
CN105499297A (en) * 2016-01-23 2016-04-20 哈尔滨理工大学 Extrusion die combining forward extrusion and equal-channel corner extrusion and extrusion machining method

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108642313A (en) * 2018-05-25 2018-10-12 哈尔滨吉星机械工程有限公司 A method of regenerating magnalium system magnesium alloy waste material using double rare earths
CN109295369A (en) * 2018-11-23 2019-02-01 上海交通大学 One kind magnesium alloy containing cerium mischmetal and its heat treatment method

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