CN109439989B - A kind of magnesium alloy and preparation method thereof - Google Patents
A kind of magnesium alloy and preparation method thereof Download PDFInfo
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- CN109439989B CN109439989B CN201910016238.6A CN201910016238A CN109439989B CN 109439989 B CN109439989 B CN 109439989B CN 201910016238 A CN201910016238 A CN 201910016238A CN 109439989 B CN109439989 B CN 109439989B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/00—Making non-ferrous alloys
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- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C22C23/00—Alloys based on magnesium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
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Abstract
The present invention relates to a kind of magnesium alloys, on the basis of its gross weight, each component including following mass fraction: Al:0.2~1.0wt.%, Mn:0.1~0.4wt.%, Ca:0.01~0.1wt.%, Cu:0~0.3wt.%, surplus are Mg and inevitable impurity, wherein, the total amount of Al, Mn, Ca and Cu are not higher than 1.8wt.%.Magnesium alloy of the invention has the characteristics that low cost, high thermal conductivity and high heat dispersion, and alloy content is lower, adds without rare earth, and easy processing shapes, production cost significantly reduces, and has excellent mechanical property after above-mentioned alloy is hot-pressed, and thermal coefficient is higher than 131W/mK.
Description
Technical field
The present invention relates to field of new materials more particularly to a kind of low cost, high thermal conductivity, high heat dispersion magnesium alloy and its
Preparation method.
Background technique
Currently, electronic product is highly integrated, high-frequency proposes requirements at the higher level to the heating conduction of electronic product components.
By taking 5G is communicated as an example, 5G smart phone transmission rate, frequency, signal strength etc. are obviously improved, smart phone " large-size screen monitors, ultra-thin "
Design concept is then with greater need for good heat dissipation performance.In addition, the working frequency range of 5G is in 3.5GHz or more, macro base station compared with 4G
The requirement of heat dissipation performance is higher and higher.Meanwhile the base station 5G covered range of signal then obviously dropped due to the raising of frequency
It is low, thus for the base station 5G, the demand of even home-use small base station it is increasing.
Aluminium alloy is one of common high thermal conductivity lightweight metal material, and the thermal coefficient of fine aluminium is about 237W/mK, but by
It is low in its intensity and be unable to satisfy industrial application requirement.By adding the elements such as Zn, Cu, Si, Mn, Mg in aluminium, conjunction can be improved
Golden intensity, but its thermal coefficient is also reduced simultaneously, if 6063T5 aluminium alloy thermal coefficient is 209W/mK, A380 aluminium alloy
Thermal coefficient is 96W/mK.
Compared with aluminium, magnesium alloy density is smaller, magnesium alloy as at present can industrial applications ideal light-duty knot
Structure material, the features such as specific strength is high, thermal diffusivity is good, electromagnetic shielding performance is excellent make it in consumer electronic industry and 5G communication
It is with a wide range of applications.
However, the thermal coefficient that the thermal coefficient of pure magnesium is about 156W/mK, AZ31 magnesium alloy be about 78W/mK,
The thermal coefficient of AZ91 magnesium alloy is about 54W/mK.By Alloying Design, it is very urgent to develop novel high thermal conductivity magnesium alloy
And key.
Application No. is 200910077615.3 Chinese patent disclose a kind of high thermal conductivity magnesium alloy (Mn content is 0.5~
3.5wt%, Zn content are 0.05~1wt%, and Ca content is 0.05~1wt%), room temperature thermal conductivity is 132W/mK.Application
Number a kind of high thermal conductivity rare earth Mg-Zn-Ca-La-Ce magnesium alloy (Zn additive amount is disclosed for 201210168014.5 Chinese patent
Be 0.5wt.%, La additive amount for 3~5.5wt.%, Ca additive amount be 0.5wt.%, Ce additive amount it is 0.2~0.5wt.%),
Thermal conductivity is 125W/mK at room temperature for it.Application No. is 201710261696.7 Chinese patent, to disclose a kind of high thermal conductivity dilute
Native magnesium alloy and preparation method thereof, in alloy containing Zn2.5~3.5wt.%, Zr0.15~0.35wt.%, Sm0~
The elements such as 1.5wt.%, room temperature thermal coefficient are greater than 120W/mK.
In magnesium alloy disclosed in the above prior art, addition element content is more, in particular by RE alloyed,
The problem of leading to three aspects: 1) alloy density increases；2) cost of raw material is higher；3) plastic deformation resistance is big, rolling or crowded
Pressing formation is difficult, and processing cost increases.Problem above causes Magnesium Alloy Industry application prospect limited, largely limits
Use of the magnesium alloy as heat sink material.
Summary of the invention
It cannot be considered in terms of the technical problem of high thermal conductivity and low cost, the purpose of the present invention for above-mentioned existing high thermal conductivity magnesium alloy
Be to provide a kind of magnesium alloy and preparation method thereof, magnesium alloy of the invention have low cost, high thermal conductivity, high heat dispersion spy
Point, and density is low, excellent in mechanical performance.
On the one hand, the present invention provides a kind of magnesium alloys, on the basis of its gross weight, each group including following mass fraction
Point: Al:0.2~1.0wt.%, Mn:0.1~0.4wt.%, Ca:0.01~0.1wt.%, Cu:0~0.3wt.%, surplus are
Mg and inevitable impurity, wherein the total amount of Al, Mn, Ca and Cu are not higher than 1.8wt.%.
Scheme as a further preference, above-mentioned magnesium alloy is on the basis of its gross weight, each group including following mass fraction
Point: Al:0.7~1.0wt.%, Mn:0.3~0.4wt.%, Ca:0.06~0.1wt.%, Cu:0~0.3wt.%, surplus are
Mg and inevitable impurity.
As a preferred embodiment of the invention, above-mentioned magnesium alloy is on the basis of its gross weight, each group including following mass fraction
Point: Al:0.78wt.%, Mn:0.37wt.%, Ca:0.08wt.%, surplus are Mg and inevitable impurity.
As another preferred embodiment of the present invention, above-mentioned magnesium alloy is on the basis of its gross weight, including each of following mass fraction
Component: Al:0.93wt.%, Mn:0.31wt.%, Ca:0.10wt.%, Cu:0.13wt.%, surplus are Mg and inevitable miscellaneous
Matter.
As the another preferred embodiment of the present invention, above-mentioned magnesium alloy is on the basis of its gross weight, including each of following mass fraction
Component: Al:0.76wt.%, Mn:0.33wt.%, Ca:0.08wt.%, Cu:0.27wt.%, surplus are Mg and inevitable miscellaneous
Matter.
Magnesium alloy of the invention has the characteristics that low cost, high thermal conductivity, high heat dispersion, and the total amount of Al, Mn, Ca and Cu are not
It is added higher than 1.8wt.%, and without rare earth element, ensure that its low-density and low cost of material.
Gravitational casting can be used in above-mentioned alloy or semicontinuous casting technique prepares different sizes, specification magnesium alloy cast rod, and
The hot formings mode such as rolling or extruding can be used and prepare magnesium alloy rod, plate, profile shapes etc., high production efficiency reduces processing
With production cost.
Yield strength is not less than 230MPa, elongation percentage not less than 160MPa, tensile strength after above-mentioned alloy is hot-pressed
Not less than 11%, excellent mechanical property ensure that its use and security performance.
Thermal coefficient is not less than 131W/mK after above-mentioned alloy is hot-pressed.
On the other hand, the present invention also provides a kind of preparation methods of above-mentioned magnesium alloy, comprising the following steps:
(1) oxidation of pure Mg, pure Al, Mg-Mn intermediate alloy, Mg-Ca intermediate alloy, Mg-Cu intermediate alloy surface are removed
Skin, the then dry, preheating at 200~250 DEG C；
(2) in protective atmosphere, protective atmosphere is led to after the processed pure Mg of step (1) is heated to 350~400 DEG C, is risen
Temperature is continuously heating to 720~740 DEG C after pure Mg is completely melt, sequentially adds through in step (1) processed pure Al, Mg-Mn
Between alloy, Mg-Ca intermediate alloy, Mg-Cu intermediate alloy, stir and evenly mix, obtain molten metal bath；In the step, pure magnesium is 400
It DEG C not yet melts, protective atmosphere is led to after being heated to 400 DEG C；
(3) oxide skin for removing the molten metal bath surface, is then injected into die for molding, obtains after being cooled to room temperature
The magnesium alloy.
Further, in step (1), in the Mg-Mn intermediate alloy, the mass fraction of Mn is 5~10%；Mg-Ca
In intermediate alloy, the mass fraction of Ca is 10~30%；In Mg-Cu intermediate alloy, the mass fraction of Cu is 10~30%.
Further, in step (2), the protective atmosphere is N2And SF6Mixed gas, volume ratio are 50:1~100:
1。
Further, after step (2), further include remove the dross on the molten metal bath surface, and stand 10~
20 minutes the step of.
It further, further include carrying out the magnesium alloy at homogenization at 400~420 DEG C after step (3)
The step of reason, the Homogenization Treatments time is 8~12 hours, magnesium alloy plate or profile shapes are obtained after hot-pressed；Hot extrusion
When pressing formation, the temperature of magnesium alloy is 350~420 DEG C, and mold temperature is 400~450 DEG C, squeeze wood egress rate is 5~
30m/min。
Further, in step (3), gravity-assist pouring or semi-continuous casting mode is can be used in injection die for molding.
According to the above aspect of the present invention, the present invention has at least the following advantages:
Compared with existing magnesium alloy, in magnesium alloy of the invention, other metal element contents in addition to Mg element are lower,
No rare earth element addition, and easy processing shapes, production cost significantly reduces.Its thermal coefficient is higher than 131W/mK, is greater than commercialization
AZ31 magnesium alloy；And heat dissipation effect is substantially better than 6063 aluminium alloys and AZ31 magnesium alloy.
Yield strength is not less than 160MPa after magnesium alloy of the invention is hot-pressed, tensile strength is not less than 230MPa,
Elongation percentage is not less than 11%, and excellent mechanical property ensure that its use and security performance.
Gravitational casting can be used in magnesium alloy of the invention or semicontinuous casting technique prepares different sizes, the casting of specification magnesium alloy
Stick, and rolling or extruding can be used etc. hot formings mode prepares magnesium alloy rod, plate, profile shapes etc., high production efficiency reduces
Processing and production cost.
The preparation method of magnesium alloy of the invention is simple, and convenient for industrialization continuous production, and production cost is low.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And can be implemented in accordance with the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention and the accompanying drawings.
Detailed description of the invention
Fig. 1 is that the magnesium alloy sun flower pattern in the embodiment of the present invention 1 squeezes profile shapes pictorial diagram；
Fig. 2 is that the magnesium alloy sun flower pattern in the embodiment of the present invention 1 squeezes profile shapes microscopic examination result；
Fig. 3 is magnesium alloy profile shapes and same section, the aluminium alloy of same volume and AZ31 magnesium alloy in the embodiment of the present invention 1
Heat dissipation performance comparison result；
Fig. 4 is the yield strength and tensile strength test knot of the magnesium alloy profile shapes or plate in the embodiment of the present invention 1~4
Fruit；
Fig. 5 is the elongation percentage test result of the magnesium alloy profile shapes or plate in the embodiment of the present invention 1~4；
Fig. 6 is magnesium alloy plate and same section, the aluminium alloy of same volume and AZ31 alloy in the embodiment of the present invention 2~3
Heat dissipation performance comparison result.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.
Embodiment 1:
Present embodiment discloses a kind of low cost, high thermal conductivity, high heat dispersion magnesium alloys, and on the basis of its gross weight, magnesium is closed
It include each component of following mass fraction: Al:0.78wt.%, Mn:0.37wt.%, Ca:0.08wt.%, surplus Mg in gold.
Preparation method includes the following steps:
1) using pure Mg, pure Al, Mg-Mn intermediate alloy (Mn content for 5%), Mg-Ca intermediate alloy, (Ca content is
20%) it, matched, weighed according to design ingredient；
2) oxide skin for removing each metal surface of step 1), blows off, and is respectively placed in 200 DEG C of baking ovens dry, preheating, standby
With；
3) by heat temperature raising in pure Mg ingot merging stainless steel crucible processed in step 2), after temperature is risen to 400 DEG C
Ventilation protection, protective gas used are N2And SF6Mixed gas, volume ratio 100:1；
4) it after the pure Mg of step 3) processing is completely melt, sequentially adds and is closed among pure Al, Mg-Mn of preheated processing
Gold, Mg-Ca intermediate alloy, make its melting；
5) mechanical stirring after the molten alloy for obtaining step 4) is warming up to 720 DEG C skims molten metal after mixing evenly
Liquid surface scum stands 10 minutes；
6) oxide skin for removing the processed molten metal bath surface of step 5), is poured into metal mold for molten metal bath
Tool, prepares magnesium alloy cast rod using semi-continuous casting mode；
7) magnesium alloy cast rod for obtaining step 6) is placed in heat-treatment furnace, is warming up to 400 DEG C and keeps the temperature progress in 8 hours uniformly
Change processing, cooled to room temperature after coming out of the stove, sawing strip off the skin, and obtain magnesium alloy bar；
8) magnesium alloy bar that step 7) obtains is prepared into magnesium alloy sun flower pattern profile shapes by hot extrusion forming process, heat
Extrusion forming process condition are as follows: 400 DEG C of magnesium bar temperature, 420 DEG C of mold temperature, squeeze wood egress rate 6m/min.
Sun flower pattern magnesium alloy profile shapes pictorial diagram manufactured in the present embodiment as shown in Figure 1, profile shapes micro-organization chart such as
Shown in Fig. 2, thermal coefficient is 131.0W/mK (as shown in table 1), and test results are shown in figure 3 for heat dissipation performance, and mechanical property is surveyed
Test result is as shown in Figure 4 and Figure 5.
Embodiment 2:
Present embodiment discloses a kind of low cost, high thermal conductivity, high heat dispersion magnesium alloys, and on the basis of its gross weight, magnesium is closed
Include each component of following mass fraction: Al:0.93wt.%, Mn:0.31wt.%, Ca:0.10wt.%, Cu in gold:
0.13wt.%, surplus Mg.
Preparation method includes the following steps:
1) using pure Mg, pure Al, Mg-Mn intermediate alloy (Mn content for 5%), Mg-Ca intermediate alloy, (Ca content is
20%) it with Mg-Cu intermediate alloy (Cu content is 15%), matched, weighed according to design ingredient；
2) oxide skin for removing each metal surface of step 1), blows off, and is respectively placed in 200 DEG C of baking ovens dry, preheating, standby
With；
3) by heat temperature raising in pure Mg ingot merging stainless steel crucible processed in step 2), after temperature is risen to 400 DEG C
Ventilation protection, protective gas used are N2And SF6Mixed gas, volume ratio 100:1；
4) it after the pure Mg of step 3) processing is completely melt, sequentially adds and is closed among pure Al, Mg-Mn of preheated processing
Gold, Mg-Ca intermediate alloy, make its melting；
5) mechanical stirring after the molten alloy for obtaining step 4) is warming up to 720 DEG C skims molten metal after mixing evenly
Liquid surface scum stands 10 minutes；
6) oxide skin for removing the processed molten metal bath surface of step 5), is poured into metal mold for molten metal bath
Tool, prepares magnesium alloy cast rod using gravitational casting mode；
7) magnesium alloy cast rod for obtaining step 6) is placed in heat-treatment furnace, is warming up to 420 DEG C and keeps the temperature progress in 8 hours uniformly
Change processing, cooled to room temperature after coming out of the stove, sawing strip off the skin, and obtain magnesium alloy bar；
8) magnesium alloy bar for obtaining step 7) crosses hot extrusion forming process all and prepares width 60mm × thickness 4mm stripper plate
Material, hot extrusion forming process condition are as follows: 420 DEG C of magnesium bar temperature, 420 DEG C of mold temperature, squeeze wood egress rate 22m/min.
The present embodiment thermal coefficient is 136.4W/mK (as shown in table 1), and test results are shown in figure 6 for heat dissipation performance, power
It is as shown in Figure 4 and Figure 5 to learn the performance test results.
Embodiment 3:
Present embodiment discloses a kind of low cost, high thermal conductivity, high heat dispersion magnesium alloys, and on the basis of its gross weight, magnesium is closed
Include each component of following mass fraction: Al:0.76wt.%, Mn:0.33wt.%, Ca:0.08wt.%, Cu in gold:
0.27wt.%, surplus Mg.
Preparation method includes the following steps:
1) using pure Mg, pure Al, Mg-Mn intermediate alloy (Mn content for 5%), Mg-Ca intermediate alloy, (Ca content is
20%) it with Mg-Cu intermediate alloy (Cu content is 15%), matched, weighed according to design ingredient；
2) oxide skin for removing each metal surface of step 1), blows off, and is respectively placed in 200 DEG C of baking ovens dry, preheating, standby
With；
3) by heat temperature raising in pure Mg ingot merging stainless steel crucible processed in step 2), after temperature is risen to 400 DEG C
Ventilation protection, protective gas used are N2And SF6Mixed gas, volume ratio 100:1；
4) it after the pure Mg of step 3) processing is completely melt, sequentially adds and is closed among pure Al, Mg-Mn of preheated processing
Gold, Mg-Ca intermediate alloy, make its melting；
5) mechanical stirring after the molten alloy for obtaining step 4) is warming up to 720 DEG C skims molten metal after mixing evenly
Liquid surface scum stands 10 minutes；
6) oxide skin for removing the processed molten metal bath surface of step 5), is poured into metal mold for molten metal bath
Tool, prepares magnesium alloy cast rod using gravitational casting mode；
7) magnesium alloy cast rod for obtaining step 6) is placed in heat-treatment furnace, is warming up to 420 DEG C and keeps the temperature progress in 10 hours
Processing is homogenized, cooled to room temperature after coming out of the stove, sawing strips off the skin, and obtains magnesium alloy bar；
8) magnesium alloy bar for obtaining step 7) prepares width 60mm × thickness 4mm extrusion plate by hot extrusion forming process,
Hot extrusion forming process condition are as follows: 420 DEG C of magnesium bar temperature, 420 DEG C of mold temperature, squeeze wood egress rate 15m/min.
The present embodiment thermal coefficient is 135.8W/mK (as shown in table 1), and test results are shown in figure 6 for heat dissipation performance, power
It is as shown in Figure 4 and Figure 5 to learn the performance test results.
Embodiment 4:
Present embodiment discloses a kind of low cost, high thermal conductivity, high heat dispersion magnesium alloys, and on the basis of its gross weight, magnesium is closed
Include each component of following mass fraction: Al:0.53wt.%, Mn:0.40wt.%, Ca:0.03wt.%, Cu in gold:
0.30wt.%, surplus Mg.
Preparation method is same as Example 2, thermal coefficient 136.6W/mK, and as shown in table 1, mechanical property is surveyed
Test result is as shown in Figure 4 and Figure 5.
Comparative example 1:
Commercial 6063 aluminium alloys and AZ31 magnesium alloy prepare sun flower pattern using technological parameter same as Example 1 and squeeze
Reduce off-flavor profile, the results are shown in Table 1 for the Measured Results of Thermal Conductivity of AZ31 alloy, the heat dissipation performance test of three kinds of sun flower pattern profile shapes
Comparing result is as shown in Figure 3.
By table 1, it is apparent that the thermal coefficient of 1~3 magnesium alloy of the embodiment of the present invention is all larger than 131W/mK, and
It is apparently higher than the thermal coefficient of commercial AZ31 magnesium alloy.
The Determination of conductive coefficients result of 1 different-alloy of table
| | AZ31 | Embodiment | 1 | |
|
|
| Thermal coefficient (W/mK) | 84.8 | 131.0 | 136.4 | 135.8 | 136.6 |
By Fig. 3, it is apparent that for rate of temperature fall, 1 magnesium alloy of the embodiment of the present invention > magnesium alloy > 6063 AZ31
Aluminium alloy, and in the same time, 1 magnesium alloy of the embodiment of the present invention cools down, and degree is bigger, and surface temperature is lower, shows excellent
Heat dissipation performance.
Comparative example 2:
Commercial 6063 aluminium alloys and AZ31 magnesium alloy prepare wide 60mm × thickness using technological parameter same as Example 2
The heat dissipation performance test comparison result of 4mm extrusion plate, four kinds of extrusion plates is as shown in Figure 6.
In Fig. 6, the rate of heat dispation curve of AZ31 and the alloy in the embodiment of the present invention 3 is essentially coincided, can be obvious by Fig. 6
Find out, for rate of temperature fall, 2 magnesium alloys of the embodiment of the present invention > embodiment, 3 magnesium alloy ≈ AZ31 magnesium alloy > 6063 aluminium alloys,
And in the same time, 2 magnesium alloy of embodiment of the present invention cooling degree is bigger, and surface temperature is lower, shows excellent heat dissipation
Performance.
The above is only a preferred embodiment of the present invention, it is not intended to restrict the invention, it is noted that for this skill
For the those of ordinary skill in art field, without departing from the technical principles of the invention, can also make it is several improvement and
Modification, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of magnesium alloy, which is characterized in that on the basis of its gross weight, be grouped as by each group of following mass fraction: Al:0.7 ~
1.0wt.%, Mn:0.3 ~ 0.4wt.%, Ca:0.06 ~ 0.1wt.%, Cu:0.13 ~ 0.27wt.%, surplus Mg, wherein Al, Mn,
The total amount of Ca and Cu is not higher than 1.8 wt.%；
The preparation method of the magnesium alloy, comprising the following steps:
(1) remove pure Mg, pure Al, Mg-Mn intermediate alloy, Mg-Ca intermediate alloy, Mg-Cu intermediate alloy surface oxide skin, so
Afterwards 200 ~ 250oDry under C, preheating；
(2) the processed pure Mg of step (1) is heated to 350 ~ 400oLead to protective atmosphere after C, heating is completely melt subsequent to pure Mg
It is continuous to be warming up to 720 ~ 740oC, sequentially add through processed pure Al, Mg-Mn intermediate alloy of step (1), Mg-Ca intermediate alloy,
Mg-Cu intermediate alloy, stirs and evenly mixs, and obtains molten metal bath；
(3) oxide skin for removing the molten metal bath surface, is then injected into die for molding, obtains after being cooled to room temperature described
Magnesium alloy；
(4) by the magnesium alloy 400 ~ 420oHomogenization Treatments are carried out under C, the Homogenization Treatments time is 8 ~ 12 hours, through hot extrusion
The step of magnesium alloy plate or profile shapes are obtained after pressing formation；When hot-pressed, the temperature of magnesium alloy is 350 ~ 420oC, mould
Having temperature is 400 ~ 450oC, squeeze wood egress rate are 5 ~ 30m/min.
2. magnesium alloy according to claim 1, which is characterized in that on the basis of its gross weight, including following mass fraction
Each component: Al:0.93wt.%, Mn:0.31wt.%, Ca:0.10wt.%, Cu:0.13wt.%, surplus Mg.
3. magnesium alloy according to claim 1, which is characterized in that on the basis of its gross weight, including following mass fraction
Each component: Al:0.76wt.%, Mn:0.33wt.%, Ca:0.08wt.%, Cu:0.27wt.%, surplus Mg.
4. magnesium alloy according to claim 1, it is characterised in that: in step (1), in the Mg-Mn intermediate alloy, Mn
Mass fraction be 5 ~ 10%；In Mg-Ca intermediate alloy, the mass fraction of Ca is 10 ~ 30%；In Mg-Cu intermediate alloy, the matter of Cu
Measuring score is 10 ~ 30%.
5. magnesium alloy according to claim 1, it is characterised in that: in step (2), the protective atmosphere is N2And SF6It is mixed
Gas is closed, volume ratio is 50:1 ~ 100:1.
6. magnesium alloy according to claim 1, it is characterised in that: further include removing the melting gold after step (2)
Belong to the dross on liquid surface, and the step of standing 10 ~ 20 minutes.
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