阅读说明：本技术 一种钽钨合金丝材的制备工艺 (Preparation process of tantalum-tungsten alloy wire ) 是由 王建生 于 2020-07-09 设计创作，主要内容包括：本发明公开了一种钽钨合金丝材的制备工艺,包括以下步骤,粉体混合,以平均粒度为3μm～5μm的钽粉和平均粒度为3μm的钨粉为原料并按所需比例进行称量后混合,将混合粉体放置于滚筒式混料机中混合均匀,得到混合粉。本发明通过在真空的条件下,将压制的坯块进行多次熔炼,并在每一次的熔炼过程中进行翻转,并进行下一次的熔炼,这样可以使得熔炼效果更加,防止熔炼不均匀,并且这样制作完成的钽钨合金丝材,简化了工艺,有效降低了原材料成本和加工成本,经过多次真空退火和拉丝处理后,得到的钽钨合金丝材平均晶粒度较小,维氏硬度,抗拉强度,屈服强度,延伸率等力学性能得到明显改善。(The invention discloses a preparation process of a tantalum-tungsten alloy wire material, which comprises the following steps of mixing powder, weighing tantalum powder with the average particle size of 3-5 mu m and tungsten powder with the average particle size of 3 mu m serving as raw materials according to a required proportion, mixing, and placing the mixed powder in a drum mixer to be uniformly mixed to obtain mixed powder. According to the invention, the pressed compact is smelted for multiple times under a vacuum condition, is overturned in each smelting process, and is smelted for the next time, so that the smelting effect is better, the smelting is prevented from being uneven, the process is simplified, the raw material cost and the processing cost are effectively reduced, and the tantalum-tungsten alloy wire obtained through multiple vacuum annealing and wire drawing treatments has small average grain size and obviously improved mechanical properties such as Vickers hardness, tensile strength, yield strength, elongation and the like.)

1. A preparation process of tantalum-tungsten alloy wire is characterized by comprising the following steps:

s1, mixing powder, namely weighing and mixing tantalum powder with the average particle size of 3-5 microns and tungsten powder with the average particle size of 3 microns serving as raw materials according to a required proportion, and placing the mixed powder into a drum mixer to be uniformly mixed to obtain mixed powder;

s2, screening the mixed materials, and sieving the mixed powder with a 120-mesh sieve to obtain fine powder;

s3: pressing the blank, namely placing the screened mixed powder on an oil press to press the blank, wherein the pressing pressure is 300-400 MPa, so as to obtain the blank;

s4: arc melting, namely putting the billet block into a crucible of an arc melting furnace, closing a furnace door, vacuumizing until the pressure in a hearth is lower than 0.003Pa, stopping vacuumizing, filling high-purity argon to 0.05MPa, vacuumizing, and repeating the vacuumizing step for three times to melt to obtain a tantalum-tungsten alloy billet;

s5: forging and profile rolling, namely forging and profile rolling the tantalum-tungsten alloy blank obtained in the step S4 in sequence to obtain a plate-shaped rolled strip;

s6: and drawing, namely drawing the rolled bar obtained in the step S5 at high temperature until the total deformation of the rolled bar is more than 70% to obtain a tantalum-tungsten alloy wire, and continuously annealing the tantalum-tungsten alloy wire to obtain the required tantalum-tungsten alloy wire.

2. The process for preparing a tantalum-tungsten alloy wire according to claim 1, wherein the powder mixing conditions of S1 are as follows: tantalum powder and tungsten powder are mixed according to the ratio of 9:1 and then are put into a drum mixer to rotate at 400 r/min-600 r/min, and the mixing time is 6h-12 h.

3. The process for preparing tantalum-tungsten alloy wire according to claim 1, wherein the compaction in S3 is performed by one-way compaction or two-way compaction.

4. The process for preparing a tantalum-tungsten alloy wire according to claim 1, wherein the step of arc melting in S4 is that the compact formed by pressing is placed in a crucible of an arc melting furnace, a furnace door is closed, the interior of the compact is evacuated to a vacuum state, the internal pressure is lower than 0.003Pa, high-purity argon is charged to 0.05MPa, then the compact is evacuated, the compact is heated to 2000 ℃ -2400 ℃, the melting current is controlled to 400A-500A, and after 3-5 minutes, the compact is turned over and the next melting is performed for 3-4 times.

5. The process of claim 1, wherein the rolled bar obtained in the step S5 is drawn at a temperature of 700 ℃ to 850 ℃ until the total deformation of the rolled bar is greater than 70%, so as to obtain a tantalum-tungsten alloy wire of Φ 2mm to Φ 5 mm.

6. The process for preparing tantalum-tungsten alloy wire according to claim 1, wherein in S6, after the tantalum-tungsten alloy wire is subjected to drawing treatment at high temperature, the temperature of vacuum annealing is controlled to be 1200-1400 ℃, the annealing duration is 90-150min, and before the annealing treatment, the tungsten alloy wire is subjected to alkali washing, wherein the alkali washing solution is a mixed solution of commercial washing powder and hot water, and the mixed solution is washed with clear water after the alkali washing is finished.

Technical Field

The invention relates to the technical field of metal material preparation, in particular to a preparation process of a tantalum-tungsten alloy wire.

Background

The tantalum-tungsten binary system alloy formed by adding a certain amount of tungsten element into tantalum has the corrosion resistance of tantalum and the good high-temperature strength of tungsten. The alloy has the advantages of high temperature resistance, high strength, good fracture toughness, corrosion resistance and the like, and is applied to the fields of aviation, aerospace, chemical engineering, nuclear industry, high temperature technology and the like. Because the tantalum-tungsten ingot has large deformation resistance, in order to prevent cracking in the forging process, the existing process for producing the tantalum-tungsten alloy is to perform warm forging on a tantalum-tungsten ingot blank, even to perform hot forging or extrusion cogging at the temperature of more than 1200 ℃, and then perform heat treatment and rolling. By using the method, a heating furnace needs to be configured, the surface of the tantalum-tungsten alloy ingot is oxidized after being heated, and the oxide layer needs to be removed after the tantalum-tungsten alloy ingot is processed, so that the production cost is increased, the process is complicated, the produced tantalum-tungsten alloy plate has uneven structure, larger alloy crystal grains and poorer mechanical property.

Disclosure of Invention

Based on the technical problems in the background art, the invention provides a preparation process of a tantalum-tungsten alloy wire.

The invention provides a preparation process of a tantalum-tungsten alloy wire, which comprises the following steps:

s1, mixing powder, namely weighing and mixing tantalum powder with the average particle size of 3-5 microns and tungsten powder with the average particle size of 3 microns serving as raw materials according to a required proportion, and placing the mixed powder into a drum mixer to be uniformly mixed to obtain mixed powder;

s2, screening the mixed materials, and sieving the mixed powder with a 120-mesh sieve to obtain fine powder;

s3: pressing the blank, namely placing the screened mixed powder on an oil press to press the blank, wherein the pressing pressure is 300-400 MPa, so as to obtain the blank;

s4: arc melting, namely putting the billet block into a crucible of an arc melting furnace, closing a furnace door, vacuumizing until the pressure in a hearth is lower than 0.003Pa, stopping vacuumizing, filling high-purity argon to 0.05MPa, vacuumizing, and repeating the vacuumizing step for three times to melt to obtain a tantalum-tungsten alloy billet;

s5: forging and profile rolling, namely forging and profile rolling the tantalum-tungsten alloy blank obtained in the step S4 in sequence to obtain a plate-shaped rolled strip;

s6: and drawing, namely drawing the rolled bar obtained in the step S5 at high temperature until the total deformation of the rolled bar is more than 70% to obtain a tantalum-tungsten alloy wire, and continuously annealing the tantalum-tungsten alloy wire to obtain the required tantalum-tungsten alloy wire.

Preferably, the powder mixing conditions of S1 are as follows: tantalum powder and tungsten powder are mixed according to the ratio of 9:1 and then are put into a drum mixer to rotate at 400 r/min-600 r/min, and the mixing time is 6h-12 h.

Preferably, the compaction in S3 is performed by unidirectional compaction or bidirectional compaction.

Preferably, the step of arc melting in S4 is to put the compact formed by pressing into a crucible of an arc melting furnace, close the furnace door, evacuate the interior of the crucible to a vacuum state, make the internal pressure lower than 0.003Pa, fill high purity argon gas to 0.05MPa, evacuate, heat to 2000 ℃ -2400 ℃, control the melting current to 400A-500A, continue for 3-5 minutes, turn over and melt for the next time, continue for 3-4 times.

Preferably, the rolled bar obtained in the step S5 is drawn at the temperature of 700-850 ℃ until the total deformation of the rolled bar is more than 70%, so as to obtain the tantalum-tungsten alloy wire with the diameter of phi 2-phi 5 mm.

Preferably, in the step S6, after the tantalum-tungsten alloy wire is subjected to drawing treatment at high temperature, the temperature of vacuum annealing is controlled to be 1200-1400 ℃, the annealing duration is 90-150min, and before the annealing treatment, the tungsten alloy wire is subjected to alkali washing, wherein the alkali washing solution is a mixed solution of commercial washing powder and hot water, and after the alkali washing is finished, the tungsten alloy wire is washed with clean water.

The invention has the beneficial effects that:

in the process of electric arc melting, the pressed compact is melted for multiple times under the vacuum condition, is overturned in each melting process and is melted for the next time, so that the melting effect is better, the non-uniform melting is prevented, the tantalum-tungsten alloy wire manufactured in the way is simplified in process, the raw material cost and the processing cost are effectively reduced, and the obtained tantalum-tungsten alloy wire has small average grain size, Vickers hardness, tensile strength, yield strength, elongation and other mechanical properties after multiple times of vacuum annealing and wire drawing treatment.

Drawings

FIG. 1 is a schematic view of a flow structure of a process for preparing tantalum-tungsten alloy wire according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to fig. 1, the preparation process of the tantalum-tungsten alloy wire comprises the following steps:

s1, powder mixing, namely, weighing and mixing tantalum powder with the average particle size of 3-5 microns and tungsten powder with the average particle size of 3 microns according to a required proportion, putting the mixed powder into a drum mixer for uniform mixing, preparing the tantalum powder and the tungsten powder according to the proportion of 9:1, putting the prepared powder into the drum mixer, rotating at 400-600 r/min, and mixing for 6-12 h to obtain mixed powder;

s2, screening the mixed materials, and sieving the mixed powder with a 120-mesh sieve to obtain fine powder;

s3: compacting, namely placing the mixed powder obtained by screening on an oil press to compact the mixed powder, wherein the compacting pressure is 300-400 MPa, so that a compact is obtained, and the compacting mode in S3 is one-way compacting or two-way compacting;

s4: arc melting, namely putting the briquette into a crucible of an arc melting furnace, closing the furnace door, vacuumizing until the pressure in a hearth is lower than 0.003Pa, stopping vacuumizing, filling high-purity argon gas to 0.05MPa, vacuumizing, repeating the vacuumizing steps for three times, and then melting to obtain a tantalum-tungsten alloy billet, wherein the arc melting step in S4 comprises the steps of putting the pressed briquette into the crucible of the arc melting furnace, closing the furnace door, vacuumizing the interior of the briquette into a vacuum state, ensuring that the internal pressure is lower than 0.003Pa, filling the high-purity argon gas to 0.05MPa, vacuumizing, heating to 2000-2400 ℃, controlling the melting current to 400-500A, turning over and melting for the next time after 3-5 minutes, and continuing for 3-4 times;

s5: forging and profile rolling, namely forging and profile rolling the tantalum-tungsten alloy blank obtained in the step S4 in sequence to obtain a plate-shaped rolled strip;

s6: drawing, namely drawing the rolled bar obtained in S5 at high temperature until the total deformation of the rolled bar is more than 70% to obtain a tantalum-tungsten alloy wire, continuously annealing the tantalum-tungsten alloy wire to obtain a required tantalum-tungsten alloy wire, drawing the rolled bar obtained in S5 at 700-850 ℃ until the total deformation of the rolled bar is more than 70% to obtain a tantalum-tungsten alloy wire with phi 2-phi 5mm, controlling the vacuum annealing temperature at 1200-1400 ℃ after the tantalum-tungsten alloy wire is drawn at high temperature in S6, and controlling the annealing duration time to be 90-150min, and before the annealing, performing alkali washing on the tungsten alloy wire, wherein the alkali washing solution is a mixed solution of commercial washing powder and hot water, and washing the tungsten alloy wire with clear water after the alkali washing is finished.