CN105755341A

CN105755341A - Aerospace-level vanadium-aluminum alloy and preparation method therefor

Info

Publication number: CN105755341A
Application number: CN201610329753.6A
Authority: CN
Inventors: 陈海军; 孙朝晖; 邓孝伯; 尹丹凤; 王永钢; 杜光超; 周芳
Original assignee: Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
Current assignee: Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
Priority date: 2016-05-18
Filing date: 2016-05-18
Publication date: 2016-07-13
Anticipated expiration: 2036-05-18
Also published as: CN105755341B

Abstract

The invention belongs to the field of metallurgy and particularly relates to aerospace-level vanadium-aluminum alloy and a preparation method therefor. The invention provides the preparation method for the aerospace-level vanadium-aluminum alloy to solve the technical problems. The preparation method comprises the following steps: smelting AlV85 and metallic aluminum in a vacuum condition to prepare AlV65, wherein a weight ratio of AlV85 to metallic aluminum is (2.41-4.67) to 1; controlling the vacuum degree to be 5-9Pa; controlling the time from beginning of smelting to alloy discharge to be 40-45 minutes; and controlling the overheat temperature during alloy discharge to be 41-50 DEG C. The method is simple to operate; and the obtained vanadium-aluminum alloy can meet the requirements of the aerospace-level vanadium-aluminum alloy.

Description

Aerospace level vananum and preparation method thereof

Technical field

The invention belongs to field of metallurgy, be specifically related to a kind of aerospace level vananum and preparation method thereof.

Background technology

The vacuum refining of alloy be lower than or far below removing the pyro-refining method of impurity in crude metal under normal pressure.This method under certain condition also can valuable element in synthetical recovery crude metal.Vacuum refining decapacitation prevents metal from reacting with oxygen, nitrogen in air and avoiding outside the pollution of gaseous impurity, it is often more important that many refining process (particularly degasification process) can also be created the thermodynamics and kinetics condition being conducive to metal and magazins' layout.

Vananum is a kind of basic material for titanium alloy, is currently continue the vanadium second largest application after application of RE in the steel.Ti-6Al-4V and Ti-8Al-1Mo-1V, both titanium alloys account for the 50% of titanium alloy market altogether, mainly for the production of jet engine, high-speed aircraft skeleton and rocket engine casing.It is add with vananum form that titanium alloy produces vanadium used.The country such as Japan, the U.S., Britain is also strengthening further containing V-Ti applied research in civilian industry.

At present, general with vanadic anhydride for raw material in vananum production technology, adopt aluminothermic process to produce vananum.Owing to vanadic anhydride and metallic aluminium react the substantial amounts of heat of releasing, heat significantly superfluous, make reaction present explosivity, be enough to make the temperature of system be increased to more than 3000 DEG C when adiabatic.Therefore, furnace charge generally to be allocated a certain amount of inert substance (being commonly called as the thermit powder that disappears) into control the temperature rise of response speed and product.Owing to disappearing, thermit powder always contains a certain amount of Fe, Si, P and heavy metal element, and in the vananum therefore produced, impurity content is higher.

The preparation method of a kind of vanadium-aluminum alloy material disclosed in Chinese patent CN200910117560.4, this method by mass percentage, weighs pulverous Al20%～33.1%, V₂O₅50%～66.9%; after ball mill mixes 8～16 hours; it is real at the pressure of 60～80MPa with forcing press to be placed in copper mould; the mould of reaction mass that will be equipped with pressing is put in thermit reaction container; material is placed detonator; with the remaining air of noble gas blowout; under 2～7MPa argon shield, it is heated to about 300 DEG C and reacts, it is thus achieved that vananum; wherein; according to mass percent, V is 75%～95%, and Al is 5.0%～25.0%; S content about 0.15%, Fe content about 0.50%.Obviously, in above-mentioned technique, in the product obtained, the impurity content such as Fe and S is higher, and this is owing in ball mill, mixing can introduce some impurity in 8～16 hours.Further, since thermit reaction carries out in airtight pressure vessel, therefore strongly limit the yield of vananum, additionally, due to require that the pressure performance of equipment is strong, therefore can improve manufacturing cost.

Summary of the invention

For the problems referred to above, the invention provides a kind of aerospace level vananum and preparation method thereof.The method comprises the following steps: AlV85 and metallic aluminium fusion smelting under vacuum prepare AlV65；Wherein, AlV85 and metallic aluminium weight ratio are 2.41～4.67 1；Control vacuum is 5～9Pa；Control melted start to the time that alloy is come out of the stove be 40～45min；Controlling degree of superheat when alloy is come out of the stove is 41～50 DEG C.

Preferably, in said method, purity >=99.85% of described aluminum.

Preferably, in said method, the granularity of described AlV85 is 0.25～6.3mm.

Preferably, in said method, described vacuum condition adopts vaccum sensitive stove.

Present invention also offers the aerospace level vananum prepared by said method.

The inventive method reasonably optimizes proportioning raw materials, vacuum, melting time, the degree of superheat etc., they cooperate, so that the inventive method can either regulate the impurity that the ratio of vanadium and aluminum can be removed in alloy again further, thus the vananum impurity content prepared is low, purity is higher, it is possible to meet the requirement of aerospace level vananum.In vananum of the present invention, Exemplary chemical composition is: V is 60～70wt%, Al is 30～40wt%, Fe≤0.3wt%, Si≤0.35wt%, N≤0.04wt%, H≤0.01wt%, O≤0.10wt%, B≤0.003wt%, C≤0.10wt%, S≤0.02wt%, P≤0.03wt%, Mo≤0.15wt%, Cr≤0.10wt%, Cu≤0.05wt%, W≤0.015wt%, Mn≤0.05wt%, Mg≤0.25wt%, Ni≤0.05wt%, Pb≤0.10wt%, it is possible to meet the chemical composition requirement of aerospace level vananum.

Detailed description of the invention

A kind of method preparing aerospace level vananum, with primary AlV85, aluminum shot for raw material, adopts the mode of an adjuvant, smelts and obtain impurity content and meet the AlV65 that aerospace level requires in vaccum sensitive stove；Wherein, AlV85 and metallic aluminium weight ratio are 2.41～4.67 1；Control vacuum is 5～9Pa；Control melted start to the time that alloy is come out of the stove be 40～45min；Controlling degree of superheat when alloy is come out of the stove is 41～50 DEG C.

In order to make final products component content meet the requirement of aerospace level vananum.AlV85 is controlled to be 2.41～4.67 1 by the inventive method with metallic aluminium weight ratio.

Through inventor have found that, when the degree of superheat is less than 41 DEG C, in alloy, impurity is not easy to float, and causes contaminant overstandard, is not easy molding during casting simultaneously；When the degree of superheat is more than 50 DEG C, Aluminum in Alloy volatilization can be caused again serious, it is not easy to control alloying component.So, it is 41～50 DEG C that the inventive method controls degree of superheat when alloy is come out of the stove.

In order to make AlV85 and Al fusion aurification better, and the comparison that in alloy, gas and solid impurity can be removed is comprehensive and economical.The inventive method control melted start to the time that alloy is come out of the stove be 40～45min.

Through inventor have found that, during smelting, in the low alloy of vacuum, gas will not be removed thus reaching standard-required；The too high meeting of vacuum causes aluminium alloy excessively to seethe in stove, causes alloy yield to reduce, simultaneously cost of idleness.So, it is 5～9Pa that the inventive method controls vacuum.

Preferably, purity >=99.85% of described aluminum shot.

Preferably, described AlV85 granularity is 0.25～6.3mm.

Present invention also offers the vananum prepared by said method.

The raw material A lV85 of the present invention is existing product, it is possible to be commercially commercially available.AlV85 need to meet non-ferrous metal industry standard-required YS/T579 2006, sees table 1 below.

Table 1Y,S/T,579 2006 chemical composition standard/%

Note: when chemical composition has particular/special requirement, is consulted to determine by both sides of supply and demand.

What the following example smelting equipment adopted is 50kg (steel weight) vaccum sensitive stove, and model is ZG-0.05 type, purchased from Jinzhou transformator electric furnace factory.

Embodiment 1

nullTake 100kgAlV85，41.49kg aluminum shot is raw material，The weight ratio of AlV85 and aluminum shot is 2.41 1，Carry out smelting reaction in vaccum sensitive stove，When alloy product is come out of the stove, the degree of superheat is 41 DEG C，Fusion smelting time 40min，Vacuum degree control is at 5Pa，After having reacted，Stand 30min，Obtain 141.03kgAlV65 product，Wherein V is 60wt%、Al is 39wt%，Fe is 0.1wt%，Si is 0.19wt%，N is 0.04wt%，H is 0.01wt%，O is 0.10wt%，B is 0.003wt%，C is 0.10wt%，S is 0.02wt%，P is 0.03wt%，Mo is 0.05wt%，Cr is 0.10wt%，Cu is 0.05wt%，W is 0.015wt%，Mn is 0.05wt%，Mg is 0.05wt%，Ni is 0.05wt%，Pb is 0.04wt%.

Embodiment 2

nullTake 100kgAlV85，33.3kg aluminum shot is raw material，The weight ratio of AlV85 and aluminum shot is 31，Carry out smelting reaction in vaccum sensitive stove，When alloy product is come out of the stove, the degree of superheat is 45 DEG C，Fusion smelting time 43min，Vacuum degree control is at 7Pa，After having reacted，Stand 30min，Obtain 133.02kg vananum product，It is wherein 63.76wt% containing V、Al is 35.24wt%，Fe is 0.08wt%，Si is 0.21wt%，N is 0.04wt%，H is 0.02wt%，O is 0.09wt%，B is 0.003wt%，C is 0.10wt%，S is 0.01wt%，P is 0.04wt%，Mo is 0.05wt%，Cr is 0.10wt%，Cu is 0.05wt%，W is 0.015wt%，Mn is 0.04wt%，Mg is 0.06wt%，Ni is 0.06wt%，Pb is 0.03wt%.

Embodiment 3

nullTake 100kgAlV85，21.41kg aluminum shot is raw material，The weight ratio of AlV85 and aluminum shot is 4.67 1，Carry out smelting reaction in vaccum sensitive stove，When alloy product is come out of the stove, the degree of superheat is 50 DEG C，Fusion smelting time 45min，Vacuum degree control is at 9Pa，After having reacted，Stand 30min，Obtain 121.23kg vananum product，It is wherein 70wt% containing V、Al is 29wt%，Fe is 0.06wt%，Si is 0.23wt%，N is 0.03wt%，H is 0.03wt%，O is 0.09wt%，B is 0.003wt%，C is 0.10wt%，S is 0.01wt%，P is 0.04wt%，Mo is 0.05wt%，Cr is 0.10wt%，Cu is 0.05wt%，W is 0.015wt%，Mn is 0.04wt%，Mg is 0.06wt%，Ni is 0.05wt%，Pb is 0.04wt%.

The obtained vananum product of the present invention, meets the chemical composition requirement of aerospace level vananum.

Claims

1. the preparation method of aerospace level vananum, it is characterised in that: comprise the following steps: AlV85 and metallic aluminium fusion smelting under vacuum prepare AlV65；Wherein, AlV85 and metallic aluminium weight ratio are 2.41～4.67 1；Control vacuum is 5～9Pa；Control melted start to the time that alloy is come out of the stove be 40～45min；Controlling degree of superheat when alloy is come out of the stove is 41～50 DEG C.

2. the preparation method of aerospace level vananum according to claim 1, it is characterised in that: purity >=99.85% of described aluminum.

3. the preparation method of aerospace level vananum according to claim 1, it is characterised in that: the granularity of described AlV85 is 0.25～6.3mm.

4. the preparation method of aerospace level vananum according to claim 1, it is characterised in that: described vacuum condition adopts vaccum sensitive stove.

5. aerospace level vananum, it is characterised in that: the preparation method described in any one of Claims 1 to 4 prepares.