CN102776392A - Method for preparing magnesium neodymium intermediate alloy with high-intensity ultrasound - Google Patents
Method for preparing magnesium neodymium intermediate alloy with high-intensity ultrasound Download PDFInfo
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- CN102776392A CN102776392A CN2012102461569A CN201210246156A CN102776392A CN 102776392 A CN102776392 A CN 102776392A CN 2012102461569 A CN2012102461569 A CN 2012102461569A CN 201210246156 A CN201210246156 A CN 201210246156A CN 102776392 A CN102776392 A CN 102776392A
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Abstract
The invention provides a method for preparing magnesium neodymium intermediate alloy with high-intensity ultrasound. The method comprises the following steps: 1) heating to melt magnesium neodymium ingot in a crucible, wrapping rare earth neodymium through a piece of aluminized paper, and adding to the pure magnesium melt, and preserving the temperature for 16 to 19 minutes within 726 to 730 DEG C; 2) extending an ultrasonic amplitude transformer into the melt to perform ultrasonic treatment in an intermittent mode for 21 to 25 minutes along with ultrasound intensity of 0.91 to 1.0 kw/cm<2>, wherein the high-intensity ultrasound is carried out for 16 to 20 seconds each time, and the intermitting is carried out for 16 to 20 seconds; and 3) refining and removing the impurity at 726 to 730 DEG C, and casting and sampling. The magnesium neodymium intermediate alloy prepared by the method has the advantages that the content is stable, and the rare earth can be effectively avoided being burned, and the oxide inclusion and the composition segregation can be reduced, and the like; and the method is simple in technology, and is safe and reliable, and convenient to operate.
Description
Technical field
The present invention relates to a kind of method for preparing magnesium neodymium master alloy with high-energy ultrasonic.
Background technology
Alloying or the microalloying effect of REE in magnesiumalloy obtained more and more noticeable achievement.Utilize a series of advantages of REE; Such as crystal grain thinning, purification melt etc.; Many scholars have developed numerous magnesium-rare earths on this basis, and they have excellent properties such as intensity height, creep resistance is good, corrosion stability is strong, thereby have satisfied the request for utilization of magnesiumalloy in various fields.Therefore,, will help to improve the economic benefit of China's magnesium-alloy material, further consolidate the status of China magnesiumalloy big country to the strengthening principle of magnesiumalloy middle-weight rare earths, to the going deep into of the series of theories such as the mechanism of action of microtexture.
At present, in magnesiumalloy, add the main form of REE three kinds of forms such as simple substance pure rare earth, mishmetal, master alloy are arranged.Because the REE chemical property is very active, when directly joining alloy with simple substance rare earth or mishmetal form, have following shortcoming: at first, easily oxidation needs scale removal before joining magnesium alloy fused mass again; Secondly, the fusing point of REE is higher, through physical diffusion or the form of chemical reaction takes place, can progressively be dissolved in the alloy after joining in the magnesium alloy fused mass.Because the velocity of diffusion of rare earth atom is slow, the alloy melting time is long; The 3rd, there are some researches show that under 720 ℃, mishmetal joins in the magnesium alloy fused mass; Yield is 23.1% after 30 min insulation, is incubated that yield is 34.8% behind 60 min, still; Add through the master alloy form, under 710 ℃, only be incubated 10 min, yield just reaches 94%.So adopt the magnesium rare earth intermediate alloy can be easier to such an extent that obtain good alloy.
Summary of the invention
The object of the present invention is to provide a kind ofly to prepare the method for magnesium neodymium master alloy with high-energy ultrasonic, it has, and technology is simple, operational safety, simultaneously the stable advantage of prepared alloy content.
The present invention realizes like this; A kind of method for preparing magnesium neodymium master alloy with high-energy ultrasonic; It is characterized in that said method comprising the steps of: 1) at first put into the crucible internal heating to pure magnesium ingot to fusing; Wrap up rare earth neodymium with aluminium-foil paper, join in the above-mentioned pure magnesium melt, in 726 ℃～730 ℃ scopes, be incubated 16～19 min then; 2) ultrasonic amplitude transformer is stretched into carry out the intermittent type supersound process in the melt, ultrasound intensity is 0.91kw/cm
2～1.0 kw/cm
2, ultrasonic time is 21～25 min, each application time 16～20 s of high-energy ultrasonic, quiescent intervals 16～20 s; 3) refining removal of impurities in 726 ℃～730 ℃ TRs, the casting sampling; Said rare earth neodymium is a particulate state or Powdered; Said alloy melt middle-weight rare earths neodymium quality accounts for 12% of gross weight; Said rare earth neodymium particle diameter is 20-100um; The purity of said rare earth neodymium is 99.9%.
Technique effect of the present invention is: the magnesium neodymium master alloy stable content that adopts the present invention to obtain, can effectively avoid the rare earth scaling loss, and reduce advantages such as oxide inclusion and component segregation, and technology is simple, safe and reliable, easy to operate.
Description of drawings
Fig. 1 is the magnesium neodymium master alloy microstructure metallograph of the present invention's preparation.
Embodiment
Below in conjunction with embodiment the present invention is done detailed elaboration,
Embodiment 1: at first putting into the crucible internal heating to pure magnesium ingot to fusing, is that 20-100um rare earth neodymium particle (purity of Nd is 99.9%) wraps up with aluminium-foil paper with diameter, joins in the above-mentioned pure magnesium melt, and wherein the rare earth neodymium quality accounts for 12% of gross weight; Be incubated 16 min down at 726 ℃ then.Ultrasonic amplitude transformer stretched into carry out the intermittent type supersound process in the melt, ultrasound intensity is 0.91kw/cm
2, ultrasonic time is 21 min, each application time 16 s of high-energy ultrasonic, quiescent intervals 16 s.726 ℃ of following refining removal of impurities, the casting sampling.
Embodiment 2: at first put into the crucible internal heating to pure magnesium ingot to fusing, Powdered rare earth neodymium (purity of Nd is 99.9%) with the aluminium-foil paper parcel, is joined in the above-mentioned pure magnesium melt, wherein the rare earth neodymium quality accounts for 12% of gross weight; Be incubated 18 min down at 728 ℃ then.Ultrasonic amplitude transformer stretched into carry out the intermittent type supersound process in the melt, ultrasound intensity is 0.96kw/cm
2, ultrasonic time is 23 min, each application time 18 s of high-energy ultrasonic, quiescent intervals 18 s.728 ℃ of following refining removal of impurities, the casting sampling.
Embodiment 3: at first put into the crucible internal heating to pure magnesium ingot to fusing; Powdered rare earth neodymium (purity of Nd is 99.9%) is wrapped up with aluminium-foil paper; Join in the above-mentioned pure magnesium melt, wherein the rare earth neodymium quality accounts for 12% of gross weight, is incubated 19 min down at 730 ℃ then.Ultrasonic amplitude transformer stretched into carry out the intermittent type supersound process in the melt, ultrasound intensity is 1.0 kw/cm
2, ultrasonic time is 25 min, each application time 20 s of high-energy ultrasonic, quiescent intervals 20 s.730 ℃ of following refining removal of impurities, the casting sampling.
The magnesium neodymium master alloy microstructure metallograph that accompanying drawing 1 obtains for embodiment 3, the eutectic structure distribution is very even in the magnesium neodymium master alloy tissue that as can be seen from the figure obtains, and shape is rounding very also.When UW imports alloy melt; Many non-linear effects will appear in the propagation of sound wave, wherein mainly show as cavitation and acoustic streaming effect, the local heating effect of whole heating, boundary in stirring, dispersion, impact fracture and the calorifics effect in the mechanics effect that cavitation and acoustic streaming are caused; Significantly improve the wettability of neodymium in pure magnesium melt; Make to be dispersed in uniformly in the magnesium solution, eliminate component segregation, reduce oxide inclusion through the neodymium in the magnesium neodymium master alloy of high-energy ultrasonic processing.The adding of neodymium can effectively be avoided the oxidation and the scaling loss of rare earth with the aluminium-foil paper parcel well in experimentation.Thereby prepared magnesium neodymium master alloy stable components, oxide inclusion and component segregation are few.
In sum, also can from figure, find out, adopt in the tissue of the magnesium neodymium master alloy that the present invention obtains the eutectic structure rounding and be evenly distributed, and technology is simple, safe and reliable, easy to operate.
Claims (5)
1. method for preparing magnesium neodymium master alloy with high-energy ultrasonic; It is characterized in that said method comprising the steps of: 1) at first put into the crucible internal heating to pure magnesium ingot to fusing; Wrap up rare earth neodymium with aluminium-foil paper; Join in the above-mentioned pure magnesium melt, in 726 ℃～730 ℃ scopes, be incubated 16～19 min then; 2) ultrasonic amplitude transformer is stretched into carry out the intermittent type supersound process in the melt, ultrasound intensity is 0.91kw/cm
2～1.0 kw/cm
2, ultrasonic time is 21～25 min, each application time 16～20 s of high-energy ultrasonic, quiescent intervals 16～20 s; 3) refining removal of impurities in 726 ℃～730 ℃ TRs, the casting sampling.
2. as claimed in claim 1ly a kind ofly prepare the method for magnesium neodymium master alloy, it is characterized in that said rare earth neodymium is a particulate state or Powdered with high-energy ultrasonic.
3. as claimed in claim 1ly a kind ofly prepare the method for magnesium neodymium master alloy, it is characterized in that said alloy melt middle-weight rare earths neodymium quality accounts for 12% of gross weight with high-energy ultrasonic.
4. as claimed in claim 2ly a kind ofly prepare the method for magnesium neodymium master alloy, it is characterized in that said rare earth neodymium particle diameter is 20-100um with high-energy ultrasonic.
5. each describedly a kind ofly prepares the method for magnesium neodymium master alloy with high-energy ultrasonic like claim 1 to 4, and the purity that it is characterized in that said rare earth neodymium is 99.9%.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2697127C1 (en) * | 2019-03-13 | 2019-08-12 | федеральное государственное бюджетное образовательное учреждение высшего образования "Санкт-Петербургский горный университет" | Method of magnesium-neodymium alloy ligature obtaining |
| CN114015904A (en) * | 2021-08-03 | 2022-02-08 | 南昌大学 | Multistage continuous impurity removal method for rare earth magnesium intermediate alloy |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU456027A1 (en) * | 1972-11-02 | 1975-01-05 | Институт Металлургии Имени А.А.Байкова | Magnesium based alloy |
| CN102134667A (en) * | 2011-02-28 | 2011-07-27 | 江苏中欧材料研究院有限公司 | Preparation method of submicron particle-reinforced aluminum-based composite material |
| CN102220505A (en) * | 2011-06-16 | 2011-10-19 | 南昌大学 | Method for preparing magnesium-lanthanum master alloy by high-intensity ultrasound |
-
2012
- 2012-07-17 CN CN2012102461569A patent/CN102776392A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU456027A1 (en) * | 1972-11-02 | 1975-01-05 | Институт Металлургии Имени А.А.Байкова | Magnesium based alloy |
| CN102134667A (en) * | 2011-02-28 | 2011-07-27 | 江苏中欧材料研究院有限公司 | Preparation method of submicron particle-reinforced aluminum-based composite material |
| CN102220505A (en) * | 2011-06-16 | 2011-10-19 | 南昌大学 | Method for preparing magnesium-lanthanum master alloy by high-intensity ultrasound |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2697127C1 (en) * | 2019-03-13 | 2019-08-12 | федеральное государственное бюджетное образовательное учреждение высшего образования "Санкт-Петербургский горный университет" | Method of magnesium-neodymium alloy ligature obtaining |
| CN114015904A (en) * | 2021-08-03 | 2022-02-08 | 南昌大学 | Multistage continuous impurity removal method for rare earth magnesium intermediate alloy |
| CN114015904B (en) * | 2021-08-03 | 2022-06-21 | 南昌大学 | Multistage continuous impurity removal method for rare earth magnesium intermediate alloy |
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Application publication date: 20121114 |