CN212223074U - Smelting device for reducing oxygen and nitrogen content of aerospace-level high-vanadium aluminum alloy - Google Patents
Smelting device for reducing oxygen and nitrogen content of aerospace-level high-vanadium aluminum alloy Download PDFInfo
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- CN212223074U CN212223074U CN202021247109.2U CN202021247109U CN212223074U CN 212223074 U CN212223074 U CN 212223074U CN 202021247109 U CN202021247109 U CN 202021247109U CN 212223074 U CN212223074 U CN 212223074U
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Abstract
The utility model provides a device is smelted in high vanadium aluminum alloy of aerospace level reduction oxygen, nitrogen content, its characterized in that: the vacuum mechanical pump, the vacuum roots pump, the control valve and the crucible cover plate are sequentially connected through pipelines; wherein the crucible cover plate is hermetically connected with the crucible; and when the vacuum mechanical pump and the vacuum Roots pump are started to pump vacuum, the control valve is opened to pump out gas existing in the crucible, and the control valve is closed after the proper vacuum degree is reached, so that the materials after reaction in the crucible are isolated from the outside air. The smelting device is started at the last stage of smelting, so that the content of impurity elements such as oxygen, nitrogen and the like brought in by the existence of air in the vanadium-aluminum alloy smelting process can be effectively reduced. The purity of the vanadium-aluminum alloy is greatly improved by controlling the content of impurity elements, the quality of the alloy is improved, and the use requirement of aerospace-grade intermediate alloy is met.
Description
Technical Field
The utility model belongs to the technical field of metal material, a master alloy material for the titanium alloy is related to, concretely relates to high vanadium aluminum alloy of aerospace reduces smelting device of oxygen, nitrogen content.
Background
The application of titanium alloy materials in the fields of aerospace, petrochemical industry, shipbuilding and the like is increasingly expanded, and the preparation capacity and the industrialization level of the titanium alloy materials in a country become important factors for measuring the comprehensive national strength of the country.
In the process of preparing the titanium alloy, different grades of titanium alloy are generated due to different performance requirements, the different grades of the titanium alloy depend on different addition elements in the components of the titanium alloy, and the alloy serving as the addition element is called as an intermediate alloy. The vanadium-aluminum alloy is a common intermediate alloy and is mainly used as an intermediate alloy for manufacturing titanium alloy and high-temperature titanium alloy and an element additive of titanium alloy with certain special purposes.
In addition, the vanadium-aluminum alloy is a high-grade alloy material used in the field of aerospace and navigation, has the characteristics of high hardness, elasticity, seawater corrosion resistance, light weight and the like, and can be used for manufacturing seaplanes and water gliders besides aerospace. Only a few countries such as the United states and Germany can be industrially produced in the world. At present, the vanadium-aluminum intermediate alloy in China has small consumption, and mainly meets the requirements of special fields such as aerospace, military and the like. With the development needs of Chinese titanium materials and related special fields, the production of high-quality and high-grade vanadium-aluminum intermediate alloys for aerospace is still blank, the potential requirements of the market cannot be met, and particularly, the implementation of large airplane projects in China urgently needs to develop and produce high-quality and high-performance high-grade vanadium-aluminum intermediate alloys. Therefore, the vanadium-aluminum intermediate alloy can replace the import in China, and the vanadium-aluminum intermediate alloy is introduced into the titanium alloy market, so that the vanadium-aluminum intermediate alloy must play a strong role in promoting the development of the titanium industry in China. In particular, because the high-grade vanadium-aluminum intermediate alloy is mainly used for manufacturing aircrafts, China needs to strengthen research and development production and break the material bottleneck of aircraft manufacturing. The vanadium-aluminum alloy smelting process produced at present in China has the following defects:
1. the impurity elements in the alloy components are higher, such as O, N, C, S, P, and the elements can have great influence on the performance of the titanium alloy. O, N, C is alpha phase stable element, and forms gap solid solution alloy and metal compound phase with titanium, which reduces the plasticity of titanium alloy; s, P is a harmful element that can cause brittleness of the titanium alloy.
2. The alloy has poor compositional uniformity, and the compositional ratio is unstable, and segregation occasionally occurs. This occasional segregation, if used to manufacture aerospace vehicles, can be a fatal factor in one hundred percent and does not guarantee "unjustifiable" quality requirements.
SUMMERY OF THE UTILITY MODEL
The utility model provides a device is smelted that aerospace level high vanadium aluminium alloy reduces oxygen, nitrogen content, and the device of should smelting is an evacuating device to make the master alloy element of the smelting even that distributes, impurity element reduces like content such as oxygen, nitrogen by a wide margin, can prepare out the aerospace level vanadium aluminium alloy that the quality is stable. The specific technical scheme is as follows:
a smelting device for reducing oxygen and nitrogen contents of aerospace-level high-vanadium aluminum alloy is characterized in that a vacuum mechanical pump (1), a vacuum roots pump (2), a control valve (3) and a crucible cover plate (4) are sequentially connected through pipelines; wherein the crucible cover plate (4) is connected with the crucible (5) in an airtight manner; and in the final stage of smelting, when the vacuum mechanical pump (1) and the vacuum roots pump (2) are vacuumized, opening the control valve (3), pumping out gas existing in the crucible (5), closing the control valve (3) after reaching a proper vacuum degree, maintaining a negative pressure vacuum state, and ensuring that the reacted material (6) in the crucible is isolated from the outside air.
The further improvement is that the crucible cover plate (4) is a flange with threads and is tightly connected with the threads processed on the outer edge of the upper opening of the crucible (5) in a screwing mode.
The further improvement is that the crucible (5) is a copper crucible.
The utility model discloses positive technological effect embodies:
1. the content of impurity elements such as carbon, silicon, nitrogen, iron, phosphorus, sulfur and the like is reduced by selecting high-purity raw materials; the dried materials are uniformly mixed in a mixer before reaction, so that the segregation of components is prevented, and the distribution uniformity of elements is ensured.
2. A smelting device is additionally arranged and started at the last stage of smelting, so that the air in the crucible after reaction can be effectively discharged, oxygen and nitrogen in the air are prevented from permeating into the material, and the oxygen and nitrogen content in the finished product is greatly reduced; in addition, impurity elements such as carbon, phosphorus, sulfur and the like in the air can be extracted, the content of other impurities in the finished product can be reduced, and the quality requirement of the aerospace-grade vanadium-aluminum alloy is met.
3. The utility model discloses owing to add the evacuating device and make vanadium aluminum alloy impurity composition content compare with current traditional technology on the crucible, show to reduce O, N element, reach 91.48%, 81.75% respectively, the technological effect is very showing. In addition, the content of C, S and P is effectively reduced.
Drawings
Fig. 1 is a schematic structural diagram of the smelting device of the utility model.
In the figure, 1-vacuum mechanical pump, 2-vacuum roots pump, 3-control valve, 4-crucible cover plate, 5-crucible, 6-material.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
As shown in figure 1, for the utility model discloses a device is smelted in high vanadium aluminum alloy of aerospace level reduction oxygen, nitrogen content, should smelt the device and be a vacuum-pumping smelting device, smelt the device for short. The smelting device is formed by sequentially connecting a vacuum mechanical pump 1, a vacuum roots pump 2, a control valve 3 and a crucible cover plate 4 through pipelines; wherein the crucible cover plate 4 is connected with the crucible 5 in an airtight manner; and in the later stage of alloy smelting, when the vacuum mechanical pump 1 and the vacuum roots pump 2 are started for vacuum pumping, the control valve 3 is opened, gas existing in the crucible 5 is pumped out, the control valve 3 is closed after the proper vacuum degree is reached, the negative pressure vacuum state is maintained, and the reacted material 6 in the crucible is isolated from the outside air. The further improvement is that the crucible cover plate 4 is a flange with screw threads and is screwed and hermetically connected with the screw threads processed on the outer edge of the upper opening of the crucible 5, so that the airtight effect is optimal, and the crucible 5 is preferably a copper crucible.
In this embodiment, taking 85% vanadium as an example, the mass percentage of vanadium in the high vanadium-aluminum alloy is set to be 85%, and the balance is aluminum. The process mixture ratio is 100kg vanadium pentoxide, 59.6kg aluminum powder and 15kg fluorite powder CaF20.5kg of potassium chlorate. The implementation steps are as follows:
step 1), preparing materials: selecting 100kg of pure vanadium pentoxide, 59.6kg of pure aluminum powder, 15kg of pure fluorite powder and 0.5kg of pure potassium chloride with proper granularity according to the set mass percentage ratio of the materials to form materials before mixing; weighing the materials with the error of not more than +/-5 g in each part, and recording the materials in a production record table;
step 2), mixing and charging reaction: the baked V2O5、CaF2Weighing aluminum powder according to a process proportion (weight of a single furnace), putting the aluminum powder into a mixing container, mixing the aluminum powder for 30-50 minutes at the temperature of 120-130 ℃, and recording the temperature and the mixing time; then the evenly mixed materials are put into a crucible 5 to form a charging material, a small amount of magnesium chips are ignited and then put into the crucible 5 to ignite the charging material, and the aluminothermic reaction is carried out for 3V2O5+10Al＝6V+5Al2O3；
Step 3), vacuum cooling: excessive aluminum and a reactant vanadium form a vanadium-aluminum alloy, a vacuum device is additionally arranged on the upper part of a crucible 5 to be hermetically connected at the last stage of smelting, a vacuum mechanical pump 1 and a vacuum roots pump 2 are started, a control valve 3 is opened to vacuumize to form negative pressure in the crucible 5, and the control valve 3 is closed after the vacuum degree is less than or equal to 3Pa to naturally cool a reacted material 6 in the crucible 5;
step 4), dismantling the furnace and weighing: after the materials in the furnace completely react and are crystallized, the furnace is disassembled after being cooled for 3 hours; when the vanadium-aluminum alloy is smelted in hot weather, the cooling time is prolonged to more than 4 hours; weighing the vanadium-aluminum alloy discharged from the furnace, calculating the yield and recording the yield into a table;
step 5), sand blasting and finishing: carrying out sand blasting treatment on the cooled vanadium-aluminum alloy block, and removing slag and furnace ash attached to the surface; then, polishing the surface of the material by using a grinding machine, further removing an oxide layer and surface defects, and blowing the surface by using high-pressure air to expose the natural color of the metal; the polished material is placed far away from a grinding machine, so that dust of a grinding wheel is prevented from falling on the material;
step 6), crushing: firstly, crushing a vanadium-aluminum alloy block into large blocks, adding the large blocks into a crusher for further crushing and refining, and then sieving the large blocks by using a sieve with the specification of 6mm, wherein the material with the size of more than 6mm needs to be crushed again; putting the same batch of vanadium-aluminum alloy into a crushing chamber for crushing, immediately barreling the sieved crushed materials, weighing and marking batch numbers;
step 7), selecting materials: for undersize crushed aggregates, impurities, foreign matters or oxides are manually picked out, and a sticky slag layer, an oxidation layer and foreign matters cannot be attached to the metal surface;
step 8), finished product inspection and warehousing: the sorted crushed aggregates finished products can be put in storage after being checked by inspectors; and (4) performing sampling inspection by inspectors according to 5 percent of the finished crushed aggregates, judging that the crushed aggregates are unqualified if impurities, foreign matters or oxides are found, and picking up the crushed aggregates again until the crushed aggregates are qualified.
The content of impurity components of vanadium-aluminum alloy in the conventional process, the smelting process (without adding a smelting device) in the embodiment and the embodiment after adding the smelting device are compared, as shown in table 1 "content comparison table of impurity components of vanadium-aluminum alloy in different production processes". As can be seen from table 1, compared with the conventional process, the embodiments of the present invention respectively reduce O, N, C, S, P by 91.48%, 81.75%, 48.75%, 86.86% and 78.89%, and have significant technical effects. In particular, the technical effect of reducing the removal O, N, which is pursued by the invention, is better.
TABLE 1 comparison table of contents of impurity components in V-Al alloy in different production processes
Claims (4)
1. A smelting device for reducing oxygen and nitrogen contents of aerospace-level high-vanadium aluminum alloy is characterized in that a vacuum mechanical pump (1), a vacuum roots pump (2), a control valve (3) and a crucible cover plate (4) are sequentially connected through pipelines; wherein the crucible cover plate (4) is connected with the crucible (5) in an airtight manner; when the vacuum mechanical pump (1) and the vacuum roots pump (2) are started for vacuumizing, the control valve (3) is opened, gas existing in the crucible (5) is pumped out, the control valve (3) is closed after the proper vacuum degree is achieved, and the reacted materials (6) in the crucible are isolated from the outside air.
2. The aerospace grade high vanadium aluminum alloy oxygen and nitrogen content reduction smelting device as claimed in claim 1, wherein the suitable vacuum degree is less than or equal to 3 Pa.
3. An aerospace grade high vanadium aluminium alloy oxygen and nitrogen content reduction smelting apparatus as claimed in claim 1, wherein the crucible cover plate (4) is a threaded flange and is screwed and airtight connected with threads machined on the outer edge of the upper opening of the crucible (5).
4. A smelting apparatus for reducing the oxygen and nitrogen content of an aerospace grade high vanadium aluminium alloy as claimed in claim 2 or 3, wherein the crucible cover plate (4) is a copper crucible.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111733340A (en) * | 2020-06-22 | 2020-10-02 | 宝鸡市嘉诚稀有金属材料有限公司 | Smelting process and vacuum device for reducing oxygen and nitrogen of aerospace-level high-vanadium aluminum alloy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111733340A (en) * | 2020-06-22 | 2020-10-02 | 宝鸡市嘉诚稀有金属材料有限公司 | Smelting process and vacuum device for reducing oxygen and nitrogen of aerospace-level high-vanadium aluminum alloy |
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