CN102618739B - Aluminum molybdenum vanadium chromium iron intermediate alloy and preparation method thereof - Google Patents

Abstract

The invention discloses an aluminum molybdenum vanadium chromium iron intermediate alloy, which comprises the following components in percentage by weight: 25-40 percent of Mo, 25-40 percent of V, 3-9 percent of Cr, 3-9 percent of Fe, less than or equal to 0.35 percent of Si, less than or equal to 0.2 percent of O, less than or equal to 0.05 percent of C, less than or equal to 0.05 percent of N, less than or equal to 0.2 percent of Cu, less than or equal to 0.1 percent of Mn and the balance Al. The invention also provides a preparation method of the aluminum molybdenum vanadium chromium iron intermediate alloy. According to the invention, smelting is performed by using a two-step method; compared with the conventional smelting method outside a furnace, the obtained ingredients are more uniform, particularly Al, Fe and Cr are added in the two steps at twice respectively, so that the uniformity of the ingredients is better than that in the case of one addition process; in addition, a unique smelting method that a carbon crucible coated with a yttrium oxide layer is used in a vacuum furnace as a smelting container is adopted; and thus, compared with the conventional copper crucible needing to be water-cooled, the manufacturing cost is greatly reduced, and the introduction of impurities can also be excellently controlled.

Description

A kind of aluminium Mo-V-Cr iron 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 Mo-V-Cr iron master alloy of smelting use and preparation method thereof.

Background technology

, along with the development of titanium alloy, adopt master alloy to add in the smelting of titanium alloy more and more general.Master alloy for adding, require segregation-free, and without metal inclusion, foreign matter content is 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 Mo-V-Cr iron master alloy and preparation method thereof, the foreign matter content of aluminium Mo-V-Cr iron master alloy can reach titanium alloy and smelt the requirement of adding, and the preparation method of master alloy can more easily control.

A kind of aluminium Mo-V-Cr iron master alloy provided by the invention, comprise following component: Mo25～40%, V25～40%, Cr3～9%, Fe3～9%, Si≤0.35%, O≤0.2%, C≤0.05%, N≤0.05%, Cu≤0.2%, Mn≤0.1%, and surplus is Al; Wherein, described per-cent is weight percentage; Described aluminium Mo-V-Cr iron master alloy prepares as follows:

1) according to MoO ₃100 parts, V ₂O ₅98～139 parts, Al114～216 part, CaF ₂18～45 parts, 24～50 parts, slag, Fe5～21 part, Cr0～21 part take each starting material;

2), with the shove charge at normal temperatures of each starting material, adopt the outer aluminothermy smelting method of stove to carry out the first step and smelt;

3) measure in addition the Cr starting material of 0～1 part of Al, the Fe of 0～3 part and 1～13 part and smelt in the first step primary products that obtain and be placed in together vacuum melting furnace and carry out vacuum melting, the smelting temperature of vacuum melting is 1450～1600 ℃, vacuum tightness is less than 0.67Pa, the rear refining 6～15 minutes of seething with excitement in short-term under the high temperature of 1500 ℃ of furnace charge fusing, and carry out alloy casting under vacuum condition.

Preferably, comprise following component: Mo25～40%, V25～40%, Cr3～9%, Fe3～9%, Si≤0.15%, O≤0.1%, C≤0.05%, N≤0.05%, Cu≤0.1%, Mn≤0.05%, surplus is Al; Wherein, described per-cent is weight percentage.

Preferably, comprise following component: Mo25～40%, V25～40%, Cr3～9%, Fe3～9%, Si≤0.1%, O≤0.02%, C≤0.02%, N≤0.02%, Cu≤0.05%, Mn≤0.05%, surplus is Al; Wherein, described per-cent is weight percentage.

The present invention also provides a kind of preparation method of aluminium Mo-V-Cr iron master alloy, comprises the steps:

1) according to MoO ₃100 parts, V ₂O ₅98～139 parts, Al114～216 part, CaF ₂18～45 parts, 24～50 parts, slag, Fe5～21 part, Cr0～21 part take each starting material;

2), with the shove charge at normal temperatures of each starting material, adopt the outer aluminothermy smelting method of stove to carry out the first step and smelt;

3) measure in addition the Cr starting material of 0～1 part of Al, the Fe of 0～3 part and 1～13 part and smelt in the first step primary products that obtain and be placed in together vacuum melting furnace and carry out vacuum melting, the smelting temperature of vacuum melting is 1450～1600 ℃, vacuum tightness is less than 0.67Pa, the rear refining 6～15 minutes of seething with excitement in short-term under the high temperature of 1500 ℃ of furnace charge fusing, and carry out alloy casting under vacuum condition.

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

The present invention is by adopting two-step approach to smelt, the outer smelting method of the existing stove of comparing, the composition that obtains is more even, especially adopts in two steps and adds at twice respectively Al, Fe and Cr, make that the homogeneity of composition more once adds better; In addition, the present invention has also adopted in vacuum oven and has used and be coated with the unique smelting process of the carbon crucible of one deck yttrium oxide as smelting vessel, like this, with the water-cooled copper crucible that will adopt in the past, compares, manufacturing cost reduces greatly, and also can control preferably the introducing of impurity.

Embodiment

The present invention adopts two-step approach to smelt aluminium Mo-V-Cr iron master alloy, mainly comprises the steps:

1) according to MoO ₃100 parts, V ₂O ₅98～139 parts, Al114～216 part, CaF ₂18～45 parts, 24～50 parts, slag, Fe5～21 part, Cr0～21 part take each starting material;

2), with the shove charge at normal temperatures of each starting material, adopt the outer aluminothermy smelting method of stove to carry out the first step and smelt;

3) will measure in addition the Cr starting material of 0～1 part of Al, the Fe of 0～3 part and 1～13 part and smelt in the first step primary products that obtain and be placed in together vacuum melting furnace and carry out vacuum melting, the smelting temperature of vacuum melting is 1450～1600 ℃, vacuum tightness is less than 0.67Pa, after furnace charge is melted to 1/4 to 2/5, can be filled with argon gas, furnace pressure is remained in 50～80Pa, to prevent that in stove, solution too seethes with excitement.After furnace charge in stove melts fully, make in stove and carry out short time high temperature boiling refining, refining time is 6～15 minutes, temperature 〉=1500 ℃.Until the alloy liquid level is tranquil, overflow without bubble, then when being 1480～1550 ℃, the alloy solution temperature casts.

In step 3), what the present invention adopted in vacuum oven is the carbon crucible, and at the internal surface of crucible, is coated with one deck yttrium oxide.Owing to adopting 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, also can keep good stability due to yttrium oxide under the condition of 1450～1600 ℃, therefore can prevent from introducing other impurity in the process of smelting, the control of the homogeneity of the tissue of alloy and the content of impurity plays a good role.

In addition, the present invention adds starting material Al, Fe and Cr in two steps in step 3), can make more disposable the wanting better of adding in the first step of homogeneity of composition.In addition, in the present invention, the yttrium oxide of coating preferably adopts analytically pure yttrium oxide.

In addition, in step 2) in, employing be that the outer thermite reaction of stove is smelted method, low as much as possible in order to make N content, for example,, lower than 0.001%, adopt vacuum aluminum thermal response smelting process in stove, specific practice is:

The starting material of step 1) weighing are put in crucible, then crucible is placed in vacuum oven, and connect the portfire of igniting, vacuumize, and then be filled with helium, by portfire, light a fire, thereby carry out thermite reaction.

Below, come by specific embodiment that the present invention is further described, the concrete method that adopts is same as the above-mentioned method.

Embodiment 1

The batching weight take Kg as unit, MoO ₃100Kg, V ₂O ₅117.8Kg, Al114.7Kg, CaF ₂38.1Kg, slag 44.4Kg, Fe9.09Kg take each starting material; Add 0.2KgAl, 2.4KgFe and the 11.6KgCr that measures in addition in step 3), smelt through two steps the alloy component that obtains as follows:

Mo is 34%, V is 33.5%, Fe is 6.6%, Cr is 6.38%, Si is 0.05%, O is 0.06%, C is 0.1%, B is 0.006%, N is 0.02%, P is 0.03%, Cu is 0.08%, Mn is 0.05%; Surplus is Al; Wherein, the per-cent here is weight percentage.

It is that stove is smelted outward that the two step smelting method the first steps of the present embodiment adopt.

Embodiment 2

The batching weight take Kg as unit, MoO ₃100Kg, V ₂O ₅100Kg, Al113.3Kg, CaF ₂30.4Kg, slag 40.6Kg, Fe5.8Kg, Cr1.45Kg take each starting material; Add 3.9KgFe and the 9KgCr that measures in addition in step 3), smelt through two steps the alloy component that obtains as follows:

Mo is 35.64%, V is 34.95%, Fe is 6.91%, Cr is 6.99%, Si is 0.07%, O is 0.07%, C is 0.08%, B is 0.007%, N is 0.002%, P is 0.02%, Cu is 0.08%, Mn is 0.04%; Surplus is Al; Wherein, the per-cent here is weight percentage.

It is vacuum metling in stove that the two step smelting method the first steps of the present embodiment adopt.

Embodiment 3

The batching weight take Kg as unit, MoO ₃100Kg, V ₂O ₅100Kg, Al128.2Kg, CaF ₂34.2Kg, slag 26.1Kg, Fe5.8Kg take each starting material; Add 1.2KgFe and the 6KgCr that measures in addition in step 3), smelt through two steps the alloy component that obtains as follows:

Mo is 34.1%, V is 33.7%, Fe is 3.71%, Cr is 3.89%, Si is 0.06%, O is 0.06%, C is 0.09%, B is 0.008%, N is 0.002%, P is 0.02%, Cu is 0.06%, Mn is 0.04%; Surplus is Al; Wherein, the per-cent here is weight percentage.

It is vacuum metling in stove that the two step smelting method the first steps of the present embodiment adopt.

Claims (5)

1. an aluminium Mo-V-Cr iron master alloy, is characterized in that, comprise following component: Mo25～40%, V25～40%, Cr3～9%, Fe3～9%, Si≤0.35%, O≤0.2%, C≤0.05%, N≤0.05%, Cu≤0.2%, Mn≤0.1%, surplus is Al; Wherein, described per-cent is weight percentage; Described aluminium Mo-V-Cr iron master alloy prepares as follows:

1) according to MoO ₃100 parts, V ₂O ₅98～139 parts, Al114～216 part, CaF ₂18～45 parts, 24～50 parts, slag, Fe5～21 part, Cr0～21 part take each starting material;

2), with the shove charge at normal temperatures of each starting material, adopt the outer aluminothermy smelting method of stove to carry out the first step and smelt;

3) measure in addition the Cr starting material of 0～1 part of Al, the Fe of 0～3 part and 1～13 part and smelt in the first step primary products that obtain and be placed in together vacuum melting furnace and carry out vacuum melting, the smelting temperature of vacuum melting is 1450～1600 ℃, vacuum tightness is less than 0.67Pa, the rear refining 6～15 minutes of seething with excitement in short-term under the high temperature of 1500 ℃ of furnace charge fusing, and carry out alloy casting under vacuum condition.

2. aluminium Mo-V-Cr iron master alloy as claimed in claim 1, it is characterized in that, comprise following component: Mo25～40%, V25～40%, Cr3～9%, Fe3～9%, Si≤0.15%, O≤0.1%, C≤0.05%, N≤0.05%, Cu≤0.1%, Mn≤0.05%, surplus is Al; Wherein, described per-cent is weight percentage.

3. aluminium Mo-V-Cr iron master alloy as claimed in claim 2, it is characterized in that, comprise following component: Mo25～40%, V25～40%, Cr3～9%, Fe3～9%, Si≤0.1%, O≤0.02%, C≤0.02%, N≤0.02%, Cu≤0.05%, Mn≤0.05%, surplus is Al; Wherein, described per-cent is weight percentage.

4. the preparation method of an aluminium Mo-V-Cr iron master alloy, is characterized in that, comprises the steps:

1) according to MoO ₃100 parts, V ₂O ₅98～139 parts, Al114～216 part, CaF ₂18～45 parts, 24～50 parts, slag, Fe5～21 part, Cr0～21 part take each starting material;

2), with the shove charge at normal temperatures of each starting material, adopt the outer aluminothermy smelting method of stove to carry out the first step and smelt;

3) measure in addition the Cr starting material of 0～1 part of Al, the Fe of 0～3 part and 1～13 part and smelt in the first step primary products that obtain and be placed in together vacuum melting furnace and carry out vacuum melting, the smelting temperature of vacuum melting is 1450～1600 ℃, vacuum tightness is less than 0.67Pa, the rear refining 6～15 minutes of seething with excitement in short-term under the high temperature of 1500 ℃ of furnace charge fusing, and carry out alloy casting under vacuum condition.

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