CN102634697A

CN102634697A - Aluminum-manganese intermediate alloy and preparation method thereof

Info

Publication number: CN102634697A
Application number: CN2012101343160A
Authority: CN
Inventors: 陆树兴
Original assignee: SHANGHAI KANGCHEN SPECIAL METAL MATERIALS CO Ltd
Current assignee: SHANGHAI KANGCHEN SPECIAL METAL MATERIALS CO Ltd
Priority date: 2012-05-02
Filing date: 2012-05-02
Publication date: 2012-08-15

Abstract

The invention discloses an aluminum-manganese intermediate alloy. The aluminum-manganese intermediate alloy comprises the following components by weight percentage: 20-30% of Mn, less than or equal to 0.05% of C, less than or equal to 0.3% of Fe, less than or equal to 0.30% of Si, less than or equal to 0.02% of N, less than or equal to 0.1% of O and the balance of Al. The invention also discloses a preparation method of an aluminum-manganese alloy. The aluminum-manganese alloy prepared by the method is uniform in component and does not have segregation. In addition, a special smelting method that a carbon crucible coated with a layer of yttrium oxide, which is used in a vacuum furnace, is taken as a smelting container is adopted and, therefore compared with the existing water-cooling copper crucible, the manufacturing cost is lowered greatly, and the introduction of impurities can be controlled well.

Description

A kind of aluminium manganese master alloy and preparation method thereof

Technical field

The present invention relates to a kind of master alloy and preparation method thereof, relate in particular to a kind of aluminium manganese master alloy of smelting usefulness and preparation method thereof.

Background technology

Along with the continuous development of titanium alloy, it is more and more general to adopt master alloy to add in the smelting of titanium alloy.Master alloy for adding requires segregation-free, and no metal inclusion, foreign matter content are low as much as possible.

Present master alloy adopts single stage method to smelt more, and the alloy of smelting not only foreign matter content is higher, and homogeneity is not fine.

Summary of the invention

The object of the present invention is to provide a kind of aluminium manganese master alloy and preparation method thereof, the foreign matter content of aluminium manganese master alloy can reach titanium alloy and smelt the requirement of adding, and the preparation method of master alloy can control more easily.

A kind of alumal provided by the invention comprises following component: Mn20～30%, C≤0.05%, Fe≤0.3%, Si≤0.30%, N≤0.02%, O≤0.1%, and surplus is A1; Wherein, described per-cent is weight percentage.

Preferably, comprise following component: Mn20～30%, C≤0.03%, Fe≤0.3%, Si≤0.20%, N≤0.02%, O≤0.1%, surplus is Al; Wherein, described per-cent is weight percentage.

Preferably, comprise following component: Mn20～30%, C≤0.02%, Fe≤0.1%, Si≤0.10%, N≤0.002%, O≤0.05%, surplus is Al; Wherein, described per-cent is weight percentage.

The present invention also provides a kind of preparation method of aluminium manganese master alloy, comprises the steps:

1) take by weighing each starting material according to Mn22.5～32.5%, Al67.5～77.5%, wherein, described per-cent is weight percentage;

2) place vacuum melting furnace to carry out vacuum melting together the starting material that taken by weighing; The smelting temperature of vacuum melting is 1450～1600 ℃; Vacuum tightness is less than 0.67Pa, and furnace charge melts the back refining 6～15 minutes of under 1500 ℃ high temperature, seething with excitement in short-term, and under vacuum condition, carries out the alloy casting.

Preferably, when said vacuum oven carries out melting, adopt carbon crucible filling furnace charge, and in said carbon crucible, apply one deck yttrium oxide.

The alumal uniform ingredients, the segregation-free that make through the present invention.In addition; The present invention has also adopted in vacuum oven, to use and has been coated with the unique smelting process of the carbon crucible of one deck yttrium oxide as smelting vessel; Like this, compare with the water-cooled copper crucible that will adopt in the past, manufacturing cost reduces greatly; And also can control the introducing of impurity preferably, especially can reduce N content greatly.

Embodiment

The present invention adopts vacuum metling aluminium manganese master alloy, mainly comprises the steps:

2) place vacuum melting furnace to carry out vacuum melting together the starting material that take by weighing; The smelting temperature of vacuum melting is 1450～1600 ℃; Vacuum tightness after furnace charge is melted to 1/4 to 2/5, can charge into argon gas less than 0.67Pa; Furnace pressure is remained in 50～80Pa, to prevent that solution too seethes with excitement in the stove.After furnace charge in stove melts fully, make and carry out short time high temperature boiling refining in the stove, refining time is 6～15 minutes, temperature >=1500 ℃.Tranquil until the alloy liquid level, no bubble is overflowed, and when the alloy solution temperature is 1480～1550 ℃, casts then.

In step 2) in, what the present invention adopted in vacuum oven is the carbon crucible, and is coated with one deck yttrium oxide at the internal surface of crucible.Owing to adopt such container to load the alloy of smelting; Compared with adopt the water-cooled copper crucible in the past on the one hand; Production cost reduces greatly, and, since yttrium oxide under 1450～1600 ℃ condition, also can keep good stability; Therefore can prevent in the process of smelting, to introduce other impurity, the control of the content of the homogeneity of alloy organizing and impurity is played a good role.

In addition, in the present invention, the yttrium oxide of coating preferably adopts analytically pure yttrium oxide.

Below, to come the present invention is further specified through specific embodiment, the concrete method that adopts is identical with above-mentioned method.

Embodiment 1

The weight of batching is unit with Kg, and Mn22.5Kg, Al77.5Kg take by weighing each starting material; Alloy component through vacuum metling obtains is following:

Mn is 20.1%, C is 0.02%, Fe is 0.1%, Si is 0.06%, N is 0.002%, O is 0.06%, and surplus is Al; Wherein, described per-cent is weight percentage.

Embodiment 2

The weight of batching is unit with Kg, and Mn25Kg, Al75Kg take by weighing each starting material; Alloy component through vacuum metling obtains is following:

Mn is 22.4%, C is 0.03%, Fe is 0.05%, Si is 0.06%, N is 0.0018%, O is 0.07%, and surplus is Al; Wherein, described per-cent is weight percentage.

Embodiment 3

The weight of batching is unit with Kg, and Mn32.5Kg, Al67.5Kg take by weighing each starting material; Alloy component through vacuum metling obtains is following:

Mn is 30%, C is 0.04%, Fe is 0.06%, Si is 0.05%, N is 0.002%, O is 0.06%, and surplus is Al; Wherein, described per-cent is weight percentage.

Claims

1. an aluminium manganese master alloy is characterized in that, comprises following component: Mn20～30%, C≤0.05%, Fe≤0.3%, Si≤0.30%, N≤0.02%, O≤0.1%, and surplus is Al; Wherein, described per-cent is weight percentage.

2. aluminium manganese master alloy as claimed in claim 1 is characterized in that, comprises following component: Mn20～30%, C≤0.03%, Fe≤0.3%, Si≤0.20%, N≤0.02%, O≤0.1%, and surplus is Al; Wherein, described per-cent is weight percentage.

3. aluminium manganese master alloy as claimed in claim 2 is characterized in that, comprises following component: Mn20～30%, C≤0.02%, Fe≤0.1%, Si≤0.10%, N≤0.002%, O≤0.05%, and surplus is Al; Wherein, described per-cent is weight percentage.

4. the preparation method of an aluminium manganese master alloy is characterized in that, comprises the steps:

5. method as claimed in claim 4 is characterized in that, when said vacuum oven carries out melting, adopts carbon crucible filling furnace charge, and in said carbon crucible, applies one deck yttrium oxide.