CN113981294A - Aluminum-molybdenum-vanadium-titanium intermediate alloy and preparation method thereof - Google Patents
Aluminum-molybdenum-vanadium-titanium intermediate alloy and preparation method thereof Download PDFInfo
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Abstract
The invention provides an aluminum-molybdenum-vanadium-titanium intermediate alloy and a preparation method thereof, and relates to the technical field of metal materials. The invention provides an aluminum molybdenum vanadium titanium intermediate alloy which comprises the following components in percentage by mass: 15.0-19.0% of Al0, 43.0-47.0% of Mos, 33.0-37.0% of V, and the balance Ti. The invention enables the aluminum molybdenum vanadium titanium intermediate alloy to have smaller component segregation by controlling the element components and the content, and prevents the component segregation of the titanium alloy when smelting TC16 titanium alloy; the aluminum-molybdenum-vanadium-titanium intermediate alloy has low impurity content, and is beneficial to the homogenization of titanium alloy components when the TC16 titanium alloy is smelted. The aluminum molybdenum vanadium titanium intermediate alloy provided by the invention is matched with TC16 titanium alloy components, and the performance of the titanium alloy TC16 is optimal.
Description
Technical Field
The invention relates to the technical field of metal materials, in particular to an aluminum-molybdenum-vanadium-titanium intermediate alloy and a preparation method thereof.
Background
Titanium and its alloy have excellent properties such as high strength, corrosion resistance, high temperature resistance and good process performance, so it is increasingly an attractive material in the field of modern industrial science and technology, and has been widely used in aerospace, aviation, petroleum, chemical engineering, light industry, metallurgy, machinery and energy.
With the rapid development of materials in recent years, the requirement of the aerospace industry for novel structural materials is more and more urgent. Therefore, titanium alloys have become important for the research of new materials in recent years. The TC16 alloy has the characteristics of moderate strength in an annealing state, good plasticity, good hardenability, heat treatment strengthening and the like, can be used for manufacturing fasteners such as bolts and rivets, can obtain higher strength and good plasticity after heat treatment strengthening, and is widely applied to airplane wings, fasteners, springs, helicopter rotors and the like. The TC6 titanium alloy is usually subjected to vacuum melting in a mode of adding metal simple substances, so that the segregation of a titanium alloy product finished product is easily caused, and the development requirement of the aerospace industry is difficult to meet.
Disclosure of Invention
In view of the above, the present invention provides an aluminum molybdenum vanadium titanium intermediate alloy and a preparation method thereof. The aluminum molybdenum vanadium titanium intermediate alloy provided by the invention has uniform and stable components, and is beneficial to the homogenization of alloy components when the titanium alloy is smelted.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides an aluminum molybdenum vanadium titanium intermediate alloy which comprises the following components in parts by mass:
15.0-19.0% of Al, 43.0-47.0% of Mo, 33.0-37.0% of V and the balance of Ti.
Preferably, the aluminum molybdenum vanadium titanium intermediate alloy comprises the following components in percentage by mass:
16.0-18.0% of Al, 44.0-46.0% of Mo, 34.0-36.0% of V and the balance of Ti.
Preferably, the aluminum molybdenum vanadium titanium intermediate alloy comprises the following components in percentage by mass:
17.0 percent of Al, 45.0 percent of Mo, 35.0 percent of V and the balance of Ti.
The invention also provides a preparation method of the aluminum-molybdenum-vanadium-titanium intermediate alloy, which comprises the following steps:
mixing a first aluminum source, a molybdenum source, a vanadium source and a titanium source, and carrying out aluminothermic reaction to obtain an aluminum-molybdenum-vanadium-titanium primary alloy;
and mixing the aluminum-molybdenum-vanadium-titanium primary alloy with a second aluminum source, and carrying out vacuum melting to obtain the aluminum-molybdenum-vanadium-titanium intermediate alloy.
Preferably, before the first aluminum source, the molybdenum source, the vanadium source and the titanium source are mixed, the method further comprises drying the first aluminum source, the molybdenum source, the vanadium source and the titanium source respectively; the drying temperature is 100-120 ℃, and the drying time is more than 6 hours.
Preferably, the first aluminum source is aluminum powder, the particle size of the aluminum powder is 0-3 mm, the molybdenum source is molybdenum trioxide, the vanadium source is vanadium pentoxide, and the titanium source is titanium dioxide; the mass ratio of the aluminum powder to the molybdenum trioxide to the vanadium pentoxide to the titanium dioxide is 1: (0.715-0.819): (1.118-1.217): (0.024-0.120).
Preferably, the second aluminum source is aluminum beans, and the particle size of the aluminum beans is 8-15 mm.
Preferably, the vacuum degree of the vacuum melting is less than 10 Pa.
Preferably, the vacuum melting comprises melting and refining which are carried out in sequence; the initial melting power is 35-45 kW, the time is 15-25 min, the transition power is 55-65 kW, the time is 30-40 min, the stable power is 65-75 kW, and the time is 15-25 min.
Preferably, the refining power is 75-85 kW, and the refining time is 3-5 min.
The invention provides an aluminum molybdenum vanadium titanium intermediate alloy which comprises the following components in percentage by mass: 15.0-19.0% of Al, 43.0-47.0% of Mo, 33.0-37.0% of V and the balance of Ti. The invention enables the aluminum molybdenum vanadium titanium intermediate alloy to have smaller component segregation by controlling the element components and the content, and prevents the component segregation of the titanium alloy when smelting TC16 titanium alloy; the aluminum-molybdenum-vanadium-titanium intermediate alloy has low impurity content, and is beneficial to the homogenization of titanium alloy components when the TC16 titanium alloy is smelted. The aluminum molybdenum vanadium titanium intermediate alloy provided by the invention is matched with TC16 titanium alloy components, and the performance of the titanium alloy TC16 is optimal.
The invention also provides a preparation method of the aluminum-molybdenum-vanadium-titanium intermediate alloy, which comprises the following steps: mixing a first aluminum source, a molybdenum source, a vanadium source and a titanium source, and carrying out aluminothermic reaction to obtain an aluminum-molybdenum-vanadium-titanium primary alloy; and mixing the aluminum-molybdenum-vanadium-titanium primary alloy with a second aluminum source, and carrying out vacuum melting to obtain the aluminum-molybdenum-vanadium-titanium intermediate alloy. According to the invention, by controlling vacuum melting, aluminum, molybdenum, vanadium and titanium elements are uniformly distributed in the alloy, the content of gas-phase impurities such as O and the like is reduced, the melting point difference and the density difference among the elements are neutralized, the problems of element burning loss caused by the melting point difference, uneven components caused by the density difference and the like in the melting process are avoided, the aluminum-molybdenum-vanadium-titanium intermediate alloy has smaller component segregation, and when the TC16 titanium alloy is melted, the homogenization of the components of the titanium alloy is facilitated, the component segregation is prevented, the batching process during the melting of the TC16 titanium alloy is optimized, the accurate batching in the production process can be realized, and the preparation of the titanium alloy is facilitated. The invention adopts a method combining aluminum heating and vacuum melting, and the melting is carried out in a vacuum environment, so as to ensure the uniformity of alloy components and low impurity content. The preparation method provided by the invention can optimize the batching procedure of titanium alloy preparation, realizes accurate batching in the TC16 titanium alloy production process, has simple preparation process, is easy to control, and is suitable for large-scale industrial production.
Detailed Description
The invention provides an aluminum molybdenum vanadium titanium intermediate alloy which comprises the following components in percentage by mass: 15.0-19.0% of Al, 43.0-47.0% of Mo, 33.0-37.0% of V and the balance of Ti.
The aluminum-molybdenum-vanadium-titanium intermediate alloy comprises, by mass, 15.0-19.0% of Al, preferably 16.0-18.0%, and more preferably 17.0%. The invention improves the room temperature and high temperature strength and heat strength of the titanium alloy by adding Al.
The aluminum-molybdenum-vanadium-titanium intermediate alloy comprises 43.0-47.0% of Mo, preferably 44.0-46.0% of Mo, and more preferably 45.0% of Mo. According to the invention, the Mo is added to improve the room temperature and high temperature strength of the titanium alloy and increase the hardenability.
The aluminum-molybdenum-vanadium-titanium intermediate alloy comprises, by mass, 33.0-37.0% of V, preferably 34.0-36.0% of V, and more preferably 35.0% of V. The invention improves the ductility, corrosion resistance and formability of the titanium alloy by adding V.
The Al element can improve the smelting environment of the titanium alloy.
The invention controls the components and the content to ensure that the aluminum molybdenum vanadium titanium intermediate alloy has uniform components and small segregation, is beneficial to the homogenization of the components of the titanium alloy when the titanium alloy is smelted, and prevents the metallurgical defects of component segregation and inclusion.
The invention provides a preparation method of the aluminum molybdenum vanadium titanium intermediate alloy, which comprises the following steps:
mixing a first aluminum source, a molybdenum source, a vanadium source and a titanium source, and carrying out aluminothermic reaction to obtain an aluminum-molybdenum-vanadium-titanium primary alloy;
and mixing the aluminum-molybdenum-vanadium-titanium primary alloy with a second aluminum source, and carrying out vacuum melting to obtain the aluminum-molybdenum-vanadium-titanium intermediate alloy.
The method comprises the steps of mixing a first aluminum source, a molybdenum source, a vanadium source and a titanium source, and carrying out aluminothermic reaction to obtain the aluminum-molybdenum-vanadium-titanium primary alloy.
Before the first aluminum source, the molybdenum source, the vanadium source and the titanium source are mixed, the first aluminum source, the molybdenum source, the vanadium source and the titanium source are preferably dried respectively, the drying temperature is preferably 100-120 ℃, more preferably 110 ℃, and the time is preferably more than 6 hours.
The drying method is not particularly limited, and the above temperature and time may be achieved. In the invention, the drying can remove water in the first aluminum source, the molybdenum source, the vanadium source and the titanium source, and prevent the oxygen evolution phenomenon in the smelting process.
In the present invention, the first aluminum source is preferably aluminum powder, the molybdenum source is preferably molybdenum trioxide, the vanadium source is preferably vanadium pentoxide, the titanium source is preferably titanium dioxide, the molybdenum trioxide is preferably a powdery raw material, the vanadium pentoxide is preferably a flaky raw material, and the titanium dioxide is preferably a powdery raw material.
In the invention, the mass ratio of the aluminum powder, the molybdenum trioxide, the vanadium pentoxide and the titanium dioxide is preferably 1: (0.715-0.819): (1.118-1.217): (0.024 to 0.120), more preferably 1: (0.735-0.799): (1.138-1.197): (0.034-0.110). According to the invention, the mass ratio of the first aluminum source, the molybdenum source, the vanadium source and the titanium source is controlled, so that the mass ratio of aluminum, molybdenum, vanadium and titanium in the aluminum-molybdenum-vanadium-titanium primary alloy is controlled, and different aluminum-molybdenum-vanadium-titanium primary alloys are obtained.
The method for mixing is not particularly limited, and the method well known in the art can ensure that the first aluminum source, the molybdenum source, the vanadium source and the titanium source are uniformly mixed; in a particular embodiment of the invention, the mixing is preferably carried out in a V-blender; the mixing speed of the V-shaped mixer is preferably 110-130 r/min, more preferably 120r/min, and the mixing time is preferably 3-5 min, more preferably 4 min. The first aluminum source, the molybdenum source, the vanadium source and the titanium source are fully contacted through mixing, so that the subsequent aluminothermic reaction is facilitated.
After the first aluminum source, the molybdenum source, the vanadium source and the titanium source are mixed, the obtained mixed powder is preferably ignited to initiate the aluminothermic reaction; the ignition operation is not particularly limited in the present invention, and an ignition method for initiating a thermite reaction, which is well known in the art, may be used.
The reaction device for the thermite reaction is not particularly limited, and a thermite reaction device well known in the field can be adopted; in a specific embodiment of the present invention, the aluminothermic reaction is preferably performed in a smelting furnace, and the furnace body of the smelting furnace is preferably a furnace body built by magnesite bricks, a furnace body sintered by aluminum oxide, or a furnace body built by graphite plates, and more preferably a furnace body built by magnesite bricks; the furnace body used in the invention has good heat insulation effect and does not introduce impurities.
In the invention, in the aluminothermic reaction process, aluminum is used as a reducing agent to reduce molybdenum trioxide, vanadium pentoxide and titanium dioxide into metal simple substances, aluminum is oxidized into aluminum oxide, and a large amount of heat energy is released to melt metals (the metal simple substances molybdenum, vanadium, titanium and excessive aluminum) to form aluminum-molybdenum-vanadium-titanium alloy liquid; the alumina formed by oxidizing the aluminum floats on the surface of the aluminum-molybdenum-vanadium-titanium alloy liquid, and is separated from the aluminum-molybdenum-vanadium-titanium alloy liquid and removed. The separation and removal process of the present invention is not particularly limited, and a process known to those skilled in the art may be selected.
After the thermite reaction is finished, the invention preferably cools the obtained aluminum-molybdenum-vanadium-titanium alloy liquid. In the present invention, the cooling is preferably furnace cooling; and cooling and discharging to obtain the aluminum-molybdenum-vanadium-titanium primary alloy.
After the aluminum-molybdenum-vanadium-titanium primary alloy is obtained, the aluminum-molybdenum-vanadium-titanium primary alloy and a second aluminum source are preferably mixed and subjected to vacuum melting to obtain the aluminum-molybdenum-vanadium-titanium intermediate alloy.
In the present invention, the second aluminum source is preferably aluminum beans, and the purity of the aluminum beans is preferably 99.7% or more. The mixing process is not particularly limited in the present invention, and the raw materials can be uniformly mixed by selecting a process known to those skilled in the art.
Before the vacuum smelting is carried out, the invention preferably carries out finishing crushing and component analysis on the aluminum-molybdenum-vanadium-titanium primary alloy; the method for the finish crushing and the component analysis is not particularly limited in the present invention, and a corresponding method well known in the art may be used. After finishing the finishing crushing and the component analysis, the obtained alloy is not subjected to any treatment, and the obtained crushed alloy is directly used for vacuum melting. In the invention, the adding amount of the aluminum-molybdenum-vanadium-titanium primary alloy and the second aluminum source in the vacuum melting is preferably determined according to the component analysis result of the aluminum-molybdenum-vanadium-titanium primary alloy and the mass content of each metal element in the needed aluminum-molybdenum-vanadium-titanium intermediate alloy.
In the present invention, the vacuum melting is preferably performed in a medium frequency vacuum induction furnace; the vacuum degree of the vacuum melting is preferably less than 10 Pa.
In the present invention, the vacuum melting preferably includes melting and refining which are performed sequentially.
In the present invention, the melting process is preferably: adjusting the power of the medium-frequency vacuum induction furnace to the initial power to start heating, and increasing the power to the transition power after 20min to heat the metal raw material to start melting; and then the power is increased to the stable power and heated until the metal raw materials are completely melted, so as to obtain the mixed melt. In the invention, the initial power is preferably 35-45 kW, more preferably 40kW, and the time is preferably 15-20 min, preferably 20 min; the transition power is preferably 55-65 kW, more preferably 60kW, and the time is preferably 30-40 min, more preferably 35 min; the stable power is preferably 65-75 kW, more preferably 70kW, and the time is preferably 15-20 min, more preferably 20 min.
After the melting is completed, the present invention preferably refines the resultant mixed melt. In the invention, the refining power is preferably 75-85 kW, more preferably 80kW, and the refining time is preferably 3-5 min, more preferably 4 min. In the invention, the refining can remove impurities and gases in the mixed melt to obtain pure alloy liquid.
After the vacuum melting is finished, the obtained alloy liquid is preferably cooled. In the invention, the cooling mode is preferably furnace cooling after casting; the operation of the casting is not particularly limited in the invention, and the casting method well known in the field can be adopted; the cooling termination temperature is preferably 150 ℃ or lower. And discharging the product after cooling to obtain the aluminum-molybdenum-vanadium-titanium intermediate alloy.
The preparation method provided by the invention neutralizes the melting point difference and density difference among the elements, avoids the problems of element burning loss caused by the melting point difference, uneven components caused by the density difference and the like in the smelting process, can improve the uniform stability of the components of the aluminum-molybdenum-vanadium-titanium intermediate alloy, reduces the content of impurities such as O and the like by refining, has simple process, is easy to control and is suitable for large-scale industrial production.
In order to further illustrate the present invention, the aluminum molybdenum vanadium titanium intermediate alloy and the preparation method thereof provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
First, aluminothermic smelting process
(1) Drying aluminum powder, molybdenum trioxide, vanadium pentoxide and titanium dioxide at the drying temperature of 110 ℃ for 12 h;
(2) calculating the mass ratio of the alloy in the aluminothermic smelting process according to the mass fractions of molybdenum trioxide, vanadium pentoxide and titanium dioxide and the aluminum consumption of the molybdenum trioxide, vanadium pentoxide and titanium dioxide in the chemical reaction: the mass ratio of the aluminum powder to the molybdenum trioxide to the vanadium pentoxide to the titanium dioxide is as follows: 1.000: 0.819: 1.185: 0.073;
(3) aluminum powder, molybdenum trioxide, vanadium pentoxide and titanium dioxide are filled into a mixer to be mixed for 4min at the speed of 120 r/min;
(4) and (3) preheating the mixed aluminum powder, molybdenum trioxide, vanadium pentoxide and titanium dioxide to a charging temperature of 43 ℃, igniting and smelting, and discharging after 24 hours to obtain the aluminum-molybdenum-vanadium-titanium primary alloy.
Proportioning in vacuum smelting process
After the aluminum-molybdenum-vanadium-titanium primary alloy is obtained, the primary alloy is finished and crushed, and after the components are analyzed, the proportion of the smelting process is calculated according to the component requirements of the required intermediate alloy: 45.0kg of aluminum molybdenum vanadium titanium primary alloy and 5.0kg of aluminum bean.
Third, preparation before power transmission
(1) Starting a circulating water pump, checking whether the pipelines have leakage or not, and adjusting the water quantity distribution of each pipeline to be proper and the pressure to be proper;
(2) checking whether the power system is normal or not, and if the power system is abnormal, maintaining in time;
(3) and if the transparent condition of the glass of the observation hole is determined to be poor, the cover needs to be opened for wiping or is polished by sand paper, and after the observation hole is installed back, the position-adjusting hand button is twisted, the position adjustment needs to be flexible, and the gland is sealed well.
Fourthly, smelting
(1) Vacuumizing, and when the pressure is 10Pa, feeding electricity for smelting;
(2) power is transmitted, and the initial power is 40 kW;
(3) after 20min, adjusting the power to 60 kW;
(4) after the alloy is melted by naked eyes, the power is adjusted to 70 kW;
(5) after the alloy is melted, the power is increased to 80kW, the refining is carried out for 3min, and the casting is carried out.
And fifthly, cooling and discharging to obtain the aluminum-molybdenum-vanadium-titanium intermediate alloy.
During the smelting process it was observed that: the alloy becomes dark red and slowly melts, and the alloy liquid brightens and becomes clear.
The aluminum molybdenum vanadium titanium intermediate alloy ingot (cylinder) prepared in this example was sampled at different positions and subjected to chemical composition analysis, two points, numbered 1 and 2 respectively, were taken from the upper surface of the alloy ingot, two points, numbered 3 and 4 respectively, were taken from the lower surface of the alloy ingot, two points, numbered 5 and 6 respectively, were taken from the middle portion of the alloy ingot and subjected to composition analysis, and the results are shown in table 1. As can be seen from Table 1, the aluminum molybdenum vanadium titanium master alloy C, O prepared in the embodiment has low impurity content, uniform and stable components and no segregation.
Table 1 example 1 chemical composition of different sites of al-mo-v-ti master alloy
Example 2
First, aluminothermic smelting process
(1) Drying aluminum powder, molybdenum trioxide, vanadium pentoxide and titanium dioxide at the drying temperature of 110 ℃ for 12 h;
(2) calculating the mass ratio of the alloy in the aluminothermic smelting process according to the mass fractions of molybdenum trioxide, vanadium pentoxide and titanium dioxide and the aluminum consumption of the molybdenum trioxide, vanadium pentoxide and titanium dioxide in the chemical reaction: the mass ratio of the aluminum powder to the molybdenum trioxide to the vanadium pentoxide to the titanium dioxide is as follows: 1.000: 0.790: 1.201: 0.049;
(3) aluminum powder, molybdenum trioxide, vanadium pentoxide and titanium dioxide are filled into a mixer to be mixed for 4min at the speed of 120 r/min;
(4) and (3) preheating the mixed aluminum powder, molybdenum trioxide, vanadium pentoxide and titanium dioxide to a charging temperature of 43 ℃, igniting and smelting, and discharging after 24 hours to obtain the aluminum-molybdenum-vanadium-titanium primary alloy.
Proportioning in vacuum smelting process
After the aluminum-molybdenum-vanadium-titanium primary alloy is obtained, the primary alloy is finished and crushed, and after the components are analyzed, the proportion of the smelting process is calculated according to the component requirements of the required intermediate alloy: 45.0kg of aluminum molybdenum vanadium titanium primary alloy and 5.0kg of aluminum bean.
Third, preparation before power transmission
(1) Starting a circulating water pump, checking whether the pipelines have leakage or not, and adjusting the water quantity distribution of each pipeline to be proper and the pressure to be proper;
(2) checking whether the power system is normal or not, and if the power system is abnormal, maintaining in time;
(3) and if the transparent condition of the glass of the observation hole is determined to be poor, the cover needs to be opened for wiping or is polished by sand paper, and after the observation hole is installed back, the position-adjusting hand button is twisted, the position adjustment needs to be flexible, and the gland is sealed well.
Fourthly, smelting
(1) Vacuumizing, and when the pressure is 10Pa, feeding electricity for smelting;
(2) power is transmitted, and the initial power is 40 kW;
(3) after 20min, adjusting the power to 60 kW;
(4) after the alloy is melted by naked eyes, the power is adjusted to 70 kW;
(5) after the alloy is melted, the power is increased to 80kW, the refining is carried out for 3min, and the casting is carried out.
And fifthly, cooling and discharging to obtain the aluminum-molybdenum-vanadium-titanium intermediate alloy.
During the smelting process it was observed that: the alloy becomes dark red and slowly melts, and the alloy liquid brightens and becomes clear.
The aluminum molybdenum vanadium titanium intermediate alloy ingot (cylinder) prepared in this example was sampled at different positions and subjected to chemical composition analysis, two points, numbered 1 and 2 respectively, were taken from the upper surface of the alloy ingot, two points, numbered 3 and 4 respectively, were taken from the lower surface of the alloy ingot, two points, numbered 5 and 6 respectively, were taken from the middle portion of the alloy ingot and subjected to composition analysis, and the results are shown in table 2. As can be seen from Table 2, the aluminum molybdenum vanadium titanium master alloy C, O prepared in the embodiment has low impurity content, uniform and stable components and no segregation.
Table 2 example 2 chemical composition of different sites of al-mo-v-ti master alloy
Example 3
First, aluminothermic smelting process
(1) Drying aluminum powder, molybdenum trioxide, vanadium pentoxide and titanium dioxide at the drying temperature of 110 ℃ for 12 h;
(2) calculating the mass ratio of the alloy in the aluminothermic smelting process according to the mass fractions of molybdenum trioxide, vanadium pentoxide and titanium dioxide and the aluminum consumption of the molybdenum trioxide, vanadium pentoxide and titanium dioxide in the chemical reaction: the mass ratio of the aluminum powder to the molybdenum trioxide to the vanadium pentoxide to the titanium dioxide is as follows: 1.000: 0.762: 1.217: 0.024;
(3) aluminum powder, molybdenum trioxide, vanadium pentoxide and titanium dioxide are filled into a mixer to be mixed for 4min at the speed of 120 r/min;
(4) and (3) preheating the mixed aluminum powder, molybdenum trioxide, vanadium pentoxide and titanium dioxide to a charging temperature of 43 ℃, igniting and smelting, and discharging after 24 hours to obtain the aluminum-molybdenum-vanadium-titanium primary alloy.
Proportioning in vacuum smelting process
After the aluminum-molybdenum-vanadium-titanium primary alloy is obtained, the primary alloy is finished and crushed, and after the components are analyzed, the proportion of the smelting process is calculated according to the component requirements of the required intermediate alloy: 45.0kg of aluminum molybdenum vanadium titanium primary alloy and 5.0kg of aluminum bean.
Third, preparation before power transmission
(1) Starting a circulating water pump, checking whether the pipelines have leakage or not, and adjusting the water quantity distribution of each pipeline to be proper and the pressure to be proper;
(2) checking whether the power system is normal or not, and if the power system is abnormal, maintaining in time;
(3) and if the transparent condition of the glass of the observation hole is determined to be poor, the cover needs to be opened for wiping or is polished by sand paper, and after the observation hole is installed back, the position-adjusting hand button is twisted, the position adjustment needs to be flexible, and the gland is sealed well.
Fourthly, smelting
(1) Vacuumizing, and when the pressure is 10Pa, feeding electricity for smelting;
(2) power is transmitted, and the initial power is 40 kW;
(3) after 20min, adjusting the power to 60 kW;
(4) after the alloy is melted by naked eyes, the power is adjusted to 70 kW;
(5) after the alloy is melted, the power is increased to 80kW, the refining is carried out for 3min, and the casting is carried out.
And fifthly, cooling and discharging to obtain the aluminum-molybdenum-vanadium-titanium intermediate alloy.
During the smelting process it was observed that: the alloy becomes dark red and slowly melts, and the alloy liquid brightens and becomes clear.
The al-mo-v-ti intermediate alloy ingot (cylinder) prepared in this example was sampled at different positions and subjected to chemical composition analysis, two points, numbered 1 and 2 respectively, were taken from the upper surface of the alloy ingot, two points, numbered 3 and 4 respectively, were taken from the lower surface of the alloy ingot, and two points, numbered 5 and 6 respectively, were taken from the middle of the alloy ingot to perform composition analysis, and the results are shown in table 3. As can be seen from Table 3, the aluminum molybdenum vanadium titanium master alloy C, O prepared in the embodiment has low impurity content, uniform and stable components and no segregation.
Table 3 example 3 chemical composition of different sites of al-mo-v-ti master alloy
Example 4
First, aluminothermic smelting process
(1) Drying aluminum powder, molybdenum trioxide, vanadium pentoxide and titanium dioxide at the drying temperature of 110 ℃ for 12 h;
(2) calculating the mass ratio of the alloy in the aluminothermic smelting process according to the mass fractions of molybdenum trioxide, vanadium pentoxide and titanium dioxide and the aluminum consumption of the molybdenum trioxide, vanadium pentoxide and titanium dioxide in the chemical reaction: the mass ratio of the aluminum powder to the molybdenum trioxide to the vanadium pentoxide to the titanium dioxide is as follows: 1.000: 0.740: 1.139: 0.097;
(3) aluminum powder, molybdenum trioxide, vanadium pentoxide and titanium dioxide are filled into a mixer to be mixed for 4min at the speed of 120 r/min;
(4) and (3) preheating the mixed aluminum powder, molybdenum trioxide, vanadium pentoxide and titanium dioxide to a charging temperature of 43 ℃, igniting and smelting, and discharging after 24 hours to obtain the aluminum-molybdenum-vanadium-titanium primary alloy.
Proportioning in vacuum smelting process
After the aluminum-molybdenum-vanadium-titanium primary alloy is obtained, the primary alloy is finished and crushed, and after the components are analyzed, the proportion of the smelting process is calculated according to the component requirements of the required intermediate alloy: 45.0kg of aluminum molybdenum vanadium titanium primary alloy and 5.0kg of aluminum bean.
Third, preparation before power transmission
(1) Starting a circulating water pump, checking whether the pipelines have leakage or not, and adjusting the water quantity distribution of each pipeline to be proper and the pressure to be proper;
(2) checking whether the power system is normal or not, and if the power system is abnormal, maintaining in time;
(3) and if the transparent condition of the glass of the observation hole is determined to be poor, the cover needs to be opened for wiping or is polished by sand paper, and after the observation hole is installed back, the position-adjusting hand button is twisted, the position adjustment needs to be flexible, and the gland is sealed well.
Fourthly, smelting
(1) Vacuumizing, and when the pressure is 10Pa, feeding electricity for smelting;
(2) power is transmitted, and the initial power is 40 kW;
(3) after 20min, adjusting the power to 60 kW;
(4) after the alloy is melted by naked eyes, the power is adjusted to 70 kW;
(5) after the alloy is melted, the power is increased to 80kW, the refining is carried out for 3min, and the casting is carried out.
And fifthly, cooling and discharging to obtain the aluminum-molybdenum-vanadium-titanium intermediate alloy.
During the smelting process it was observed that: the alloy becomes dark red and slowly melts, and the alloy liquid brightens and becomes clear.
The aluminum molybdenum vanadium titanium intermediate alloy ingot (cylinder) prepared in this example was sampled at different positions and subjected to chemical composition analysis, two points, numbered 1 and 2 respectively, were taken from the upper surface of the alloy ingot, two points, numbered 3 and 4 respectively, were taken from the lower surface of the alloy ingot, two points, numbered 5 and 6 respectively, were taken from the middle portion of the alloy ingot and subjected to composition analysis, and the results are shown in table 4. As can be seen from Table 4, the aluminum molybdenum vanadium titanium master alloy C, O prepared in the embodiment has low impurity content, uniform and stable components and no segregation.
Table 4 example 4 chemical composition of different sites of al-mo-v-ti master alloy
Example 5
First, aluminothermic smelting process
(1) Drying aluminum powder, molybdenum trioxide, vanadium pentoxide and titanium dioxide at the drying temperature of 110 ℃ for 12 h;
(2) calculating the mass ratio of the alloy in the aluminothermic smelting process according to the mass fractions of molybdenum trioxide, vanadium pentoxide and titanium dioxide and the aluminum consumption of the molybdenum trioxide, vanadium pentoxide and titanium dioxide in the chemical reaction: the mass ratio of the aluminum powder to the molybdenum trioxide to the vanadium pentoxide to the titanium dioxide is as follows: 1.000: 0.715: 1.108: 0.120 of;
(3) aluminum powder, molybdenum trioxide, vanadium pentoxide and titanium dioxide are filled into a mixer to be mixed for 4min at the speed of 120 r/min;
(4) and (3) preheating the mixed aluminum powder, molybdenum trioxide, vanadium pentoxide and titanium dioxide to a charging temperature of 43 ℃, igniting and smelting, and discharging after 24 hours to obtain the aluminum-molybdenum-vanadium-titanium primary alloy.
Proportioning in vacuum smelting process
After the aluminum-molybdenum-vanadium-titanium primary alloy is obtained, the primary alloy is finished and crushed, and after the components are analyzed, the proportion of the smelting process is calculated according to the component requirements of the required intermediate alloy: 45.0kg of aluminum molybdenum vanadium titanium primary alloy and 5.0kg of aluminum bean.
Third, preparation before power transmission
(1) Starting a circulating water pump, checking whether the pipelines have leakage or not, and adjusting the water quantity distribution of each pipeline to be proper and the pressure to be proper;
(2) checking whether the power system is normal or not, and if the power system is abnormal, maintaining in time;
(3) and if the transparent condition of the glass of the observation hole is determined to be poor, the cover needs to be opened for wiping or is polished by sand paper, and after the observation hole is installed back, the position-adjusting hand button is twisted, the position adjustment needs to be flexible, and the gland is sealed well.
Fourthly, smelting
(1) Vacuumizing, and when the pressure is 10Pa, feeding electricity for smelting;
(2) power is transmitted, and the initial power is 40 kW;
(3) after 20min, adjusting the power to 60 kW;
(4) after the alloy is melted by naked eyes, the power is adjusted to 70 kW;
(5) after the alloy is melted, the power is increased to 80kW, the refining is carried out for 3min, and the casting is carried out.
And fifthly, cooling and discharging to obtain the aluminum-molybdenum-vanadium-titanium intermediate alloy.
During the smelting process it was observed that: the alloy becomes dark red and slowly melts, and the alloy liquid brightens and becomes clear.
The aluminum molybdenum vanadium titanium intermediate alloy ingot (cylinder) prepared in this example was sampled at different positions and subjected to chemical composition analysis, two points, numbered 1 and 2 respectively, were taken from the upper surface of the alloy ingot, two points, numbered 3 and 4 respectively, were taken from the lower surface of the alloy ingot, two points, numbered 5 and 6 respectively, were taken from the middle portion of the alloy ingot and subjected to composition analysis, and the results are shown in table 5. As can be seen from Table 5, the Al-Mo-V-Ti master alloy C, O prepared in this example has low impurity content, uniform and stable composition, and no segregation.
TABLE 5 EXAMPLE 5 chemical composition of different sites of Al-Mo-V-Ti master alloy
One position of the aluminum molybdenum vanadium titanium intermediate alloy ingot (cylinder) prepared in examples 1 to 5 was sampled by a conventional analysis method for chemical composition analysis, and the obtained results are shown in table 6. As can be seen from Table 6, the aluminum molybdenum vanadium titanium intermediate alloy C, O prepared in the embodiments 1-5 has low impurity content.
TABLE 6 examples 1-5 chemical compositions of Al-Mo-V-Ti intermediate alloys
The embodiment shows that the aluminum molybdenum vanadium titanium intermediate alloy provided by the invention has uniform and stable components and low impurity content, so that the aluminum molybdenum vanadium titanium intermediate alloy is beneficial to the homogenization of titanium alloy components, prevents component segregation, optimizes the batching process during titanium alloy smelting and can realize accurate batching in the production process when being used as a raw material for producing titanium alloy. Moreover, the preparation method provided by the invention is simple and easy to operate, the preparation process is stable and controllable, and the alloy forming state is good.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (10)
1. The aluminum-molybdenum-vanadium-titanium intermediate alloy is characterized by comprising the following components in parts by mass:
15.0-19.0% of Al, 43.0-47.0% of Mo, 33.0-37.0% of V and the balance of Ti.
2. The aluminum-molybdenum-vanadium-titanium intermediate alloy as claimed in claim 1, which comprises the following components in mass fraction:
16.0-18.0% of Al, 44.0-46.0% of Mo, 34.0-36.0% of V and the balance of Ti.
3. The aluminum-molybdenum-vanadium-titanium intermediate alloy as claimed in claim 1, which comprises the following components in mass fraction:
17.0 percent of Al, 45.0 percent of Mo, 35.0 percent of V and the balance of Ti.
4. The preparation method of the aluminum-molybdenum-vanadium-titanium intermediate alloy as claimed in any one of claims 1 to 3, which is characterized by comprising the following steps:
mixing a first aluminum source, a molybdenum source, a vanadium source and a titanium source, and carrying out aluminothermic reaction to obtain an aluminum-molybdenum-vanadium-titanium primary alloy;
and mixing the aluminum-molybdenum-vanadium-titanium primary alloy with a second aluminum source, and carrying out vacuum melting to obtain the aluminum-molybdenum-vanadium-titanium intermediate alloy.
5. The method of claim 4, wherein before the mixing of the first aluminum source, molybdenum source, vanadium source and titanium source, the method further comprises drying the first aluminum source, molybdenum source, vanadium source and titanium source separately; the drying temperature is 100-120 ℃, and the drying time is more than 6 hours.
6. The preparation method according to claim 4, wherein the first aluminum source is aluminum powder with a particle size of 0-3 mm, the molybdenum source is molybdenum trioxide, the vanadium source is vanadium pentoxide, and the titanium source is titanium dioxide; the mass ratio of the aluminum powder to the molybdenum trioxide to the vanadium pentoxide to the titanium dioxide is 1: (0.715-0.819): (1.118-1.217): (0.024-0.120).
7. The method according to claim 4, wherein the second aluminum source is aluminum beans, and the particle size of the aluminum beans is 8 to 15 mm.
8. The method as claimed in claim 4, wherein the vacuum degree of the vacuum melting is less than 10 Pa.
9. The production method according to claim 4 or 8, wherein the vacuum melting comprises melting and refining which are performed in sequence; the initial melting power is 35-45 kW, the time is 15-25 min, the transition power is 55-65 kW, the time is 30-40 min, the stable power is 65-75 kW, and the time is 15-25 min.
10. The preparation method according to claim 9, wherein the refining is performed at a power of 75-85 kW for 3-5 min.
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