阅读说明：本技术 一种提高成品率的钽钨合金板加工成型工艺 (Tantalum-tungsten alloy plate machining and forming process capable of improving yield ) 是由 王建生 于 2020-07-09 设计创作，主要内容包括：本发明公开了一种提高成品率的钽钨合金板加工成型工艺,包括以下步骤,原料混合,将平均粒度为3μm～5μm的钽粉和平均粒度为3μm的钨粉做为原料,然后将两者以一定的所需比例进行混合,然后将混合后的钽分和钨粉放入高能球磨机内进行充分混合,得到混合粉。本发明高能球磨机对钽钨粉进行充分混合,对钽钨坯料进行充分破碎混合,然后通过筛选机对坯料颗粒进行筛选得到质地均匀的坯料颗粒,让钽钨合金板的组织分布更加的均匀,提高钽钨合金板加工成型成品率,同时,热压可让钽钨合金板组织密实,力学性能得到改善,三次冷轧提高了钽钨合金板的屈服点,四次退火步骤,消除钽钨合金板残余应力,避免钽钨合金板在日后切割中出现变形和裂纹。(The invention discloses a tantalum-tungsten alloy plate processing and forming process capable of improving the yield, which comprises the following steps of mixing raw materials, namely, tantalum powder with the average particle size of 3-5 mu m and tungsten powder with the average particle size of 3 mu m are used as raw materials, then the tantalum powder and the tungsten powder are mixed according to a certain required proportion, and then the mixed tantalum powder and the mixed tungsten powder are placed into a high-energy ball mill to be fully mixed to obtain mixed powder. The high-energy ball mill fully mixes the tantalum-tungsten powder, fully crushes and mixes the tantalum-tungsten blank, then screens the blank particles through the screening machine to obtain blank particles with uniform texture, so that the texture distribution of the tantalum-tungsten alloy plate is more uniform, the rate of finished products of the tantalum-tungsten alloy plate in the machining and forming process is improved, meanwhile, the hot pressing can ensure that the tantalum-tungsten alloy plate has dense texture and improved mechanical properties, the yield point of the tantalum-tungsten alloy plate is improved through three times of cold rolling, the four times of annealing steps are carried out to eliminate the residual stress of the tantalum-tungsten alloy plate, and the tantalum-tungsten alloy plate is prevented from deforming and cracking in the future cutting.)

1. A tantalum-tungsten alloy plate processing and forming process capable of improving yield is characterized by comprising the following steps:

s1, mixing raw materials, namely, taking tantalum powder with the average particle size of 3-5 mu m and tungsten powder with the average particle size of 3 mu m as raw materials, mixing the raw materials according to a certain required proportion, and then putting the mixed tantalum powder and tungsten powder into a high-energy ball mill for fully mixing to obtain mixed powder;

s2, compacting, namely placing the mixed powder on an oil press for compacting, wherein the compacting pressure is 300-450 MPa, and obtaining a blank;

s3: crushing the blank, and crushing the blank in a high-energy ball mill again to obtain blank particles;

s4: screening blanks, namely putting the blank particles into a screening machine for screening to obtain blank particles with uniform texture;

s5, performing electric arc melting, namely putting the blank particles into a crucible of an electric arc melting furnace, vacuumizing until the pressure in a hearth is lower than 0.003Pa, stopping vacuumizing, filling high-purity argon to 0.05MPa, vacuumizing, repeating the vacuumizing step for three times, and then melting to obtain a tantalum-tungsten alloy blank;

s6: and (3) forging and forming, namely performing hot rolling on the tantalum-tungsten alloy blank, performing vacuum annealing, and then performing cold rolling forming for three times to obtain the tantalum-tungsten alloy plate.

2. The forming process for tantalum-tungsten alloy plate with improved yield according to claim 1, wherein the powder mixing conditions in S1 are as follows: mixing the components in a ratio of 1: 3-1: 9 of the mixed powder is put into a high-energy ball mill for mixing, the ball milling medium is self-made tantalum balls, and the high-energy ball mill is carried out for 2-3 h under the conditions that the vacuum degree is not more than 0.1Pa and the rotating speed is 150-400 r/min.

3. The forming process for tantalum-tungsten alloy plate with improved yield according to claim 1, wherein the crushing conditions in S3 are as follows, wherein the ratio of (1): and (3) putting the blank material in a ratio of 3-1: 9 into a high-energy ball mill for crushing, wherein a ball milling medium is self-made tantalum balls, and the high-energy ball mill is used for 2-3 h under the conditions that the vacuum degree is not more than 0.1Pa and the rotating speed is 200-500 r/min.

4. The forming process for processing the tantalum-tungsten alloy plate for improving the yield according to claim 1, wherein the step of arc melting in the step S5 is that the melting current is 400-500A, the melting time is 4-6 min, the melting frequency is 3-4, and the blank is turned over after each melting.

5. The forming process of the tantalum-tungsten alloy plate with the improved yield according to claim 1, wherein the forging step in S6 is that the smelted blank is taken out and subjected to preliminary hot pressing, the blank is pressed into a plate blank with a medium thickness through an oil press, then annealing is carried out under the vacuum condition at 1250-1400 ℃, the heat preservation time is 80-120 min, and after the annealing is finished, three times of cold rolling are carried out.

6. The forming process for the tantalum-tungsten alloy plate with the improved yield according to claim 1, wherein in S6, after the first cold rolling in a hydraulic press, the second vacuum annealing is performed at 1300-1450 ℃ for 90-130 min, after the second cold rolling, the third vacuum annealing is performed at 1300-1500 ℃ for 90-140 min, and after the third cold rolling, the fourth vacuum annealing is performed at 1400-1550 ℃ for 100-150 min.

7. The forming process for the tantalum-tungsten alloy plate with the improved yield according to claim 1, wherein surface treatment needs to be carried out on the plate blank before cold rolling, cladding treatment comprises milling, grinding and polishing, alkaline washing needs to be carried out on the plate before vacuum annealing treatment, and water is used for washing after the alkaline washing is finished.

Technical Field

The invention relates to the technical field of tantalum-tungsten alloys, in particular to a tantalum-tungsten alloy plate processing and forming process capable of improving the yield.

Background

The tantalum-tungsten alloy is an alloy formed by taking tantalum as a substrate and adding a certain amount of tungsten element. Although both tantalum and tungsten can be in infinite solid solution, when the tungsten content exceeds 12at percent to 14at percent, the plasticity of the alloy is obviously reduced, and when the tungsten content is lower, the tantalum-tungsten alloy not only keeps the low-temperature plasticity of pure tantalum, but also has higher strength, oxidation resistance and corrosion resistance, so that the tantalum-tungsten alloy with lower tungsten content is widely applied to the fields of aviation, aerospace, chemical industry, nuclear industry and the like.

The preparation of tantalum-tungsten alloy blanks generally needs several processes of mixing, compacting, sintering, smelting and the like, but the tantalum-tungsten alloy plates produced by tantalum at present have uneven structures, larger alloy grains and poorer mechanical properties, so that the finished product rate is lower.

Disclosure of Invention

Based on the technical problems in the background art, the invention provides a tantalum-tungsten alloy plate processing and forming process for improving the yield.

The invention provides a tantalum-tungsten alloy plate processing and forming process capable of improving the yield, which comprises the following steps:

s1, mixing raw materials, namely, taking tantalum powder with the average particle size of 3-5 mu m and tungsten powder with the average particle size of 3 mu m as raw materials, mixing the raw materials according to a certain required proportion, and then putting the mixed tantalum powder and tungsten powder into a high-energy ball mill for fully mixing to obtain mixed powder;

s2, compacting, namely placing the mixed powder on an oil press for compacting, wherein the compacting pressure is 300-450 MPa, and obtaining a blank;

s3: crushing the blank, and crushing the blank in a high-energy ball mill again to obtain blank particles;

s4: screening blanks, namely putting the blank particles into a screening machine for screening to obtain blank particles with uniform texture;

s5, performing electric arc melting, namely putting the blank particles into a crucible of an electric arc melting furnace, vacuumizing until the pressure in a hearth is lower than 0.003Pa, stopping vacuumizing, filling high-purity argon to 0.05MPa, vacuumizing, repeating the vacuumizing step for three times, and then melting to obtain a tantalum-tungsten alloy blank;

s6: and (3) forging and forming, namely performing hot rolling on the tantalum-tungsten alloy blank, performing vacuum annealing, and then performing cold rolling forming for three times to obtain the tantalum-tungsten alloy plate.

Preferably, the powder mixing conditions in S1 are as follows: mixing the components in a ratio of 1: 3-1: 9 of the mixed powder is put into a high-energy ball mill for mixing, the ball milling medium is self-made tantalum balls, and the high-energy ball mill is carried out for 2-3 h under the conditions that the vacuum degree is not more than 0.1Pa and the rotating speed is 150-400 r/min.

Preferably, the crushing conditions in S3 are as follows, and the ratio is 1: and (3) putting the blank material in a ratio of 3-1: 9 into a high-energy ball mill for crushing, wherein a ball milling medium is self-made tantalum balls, and the high-energy ball mill is used for 2-3 h under the conditions that the vacuum degree is not more than 0.1Pa and the rotating speed is 200-500 r/min.

Preferably, the arc melting in S5 includes steps of melting current 400A to 500A, melting time 4min to 6min, and melting times 3 to 4, and turning the blank after each melting.

Preferably, the forging step in S6 is to take out the melted blank, perform preliminary hot pressing, press the blank into a slab with a medium thickness by using an oil press, perform annealing at 1250-1400 ℃ under vacuum conditions, keep the temperature for 80-120 min, and perform cold rolling three times after the annealing is finished.

Preferably, in S6, after the first cold rolling is performed in a oil press, the second vacuum annealing work is performed at the same time, the temperature is 1300-1450 ℃, the heat preservation time is 90-130 min, after the second cold rolling, the third vacuum annealing is performed, the temperature is 1300-1500 ℃, the heat preservation time is 90-140 min, after the third cold rolling, the fourth vacuum annealing is performed, the temperature is 1400-1550 ℃, and the heat preservation time is 100-150 min.

Preferably, the surface treatment of the plate blank is required before the cold rolling, the surface treatment comprises milling, grinding and polishing, the plate blank is subjected to alkali cleaning before the vacuum annealing treatment, and the plate blank is washed by water after the alkali cleaning.

The invention has the beneficial effects that:

according to the invention, tantalum-tungsten powder is fully mixed by the high-energy ball mill, tantalum-tungsten blanks are fully crushed and mixed, then blank particles with uniform texture are screened by the screening machine, the texture distribution of a tantalum-tungsten alloy plate is more uniform, the rate of finished products of the tantalum-tungsten alloy plate in the machining and forming process is improved, meanwhile, the tantalum-tungsten alloy plate can be densely woven by hot pressing, the mechanical property is improved, the yield point of the tantalum-tungsten alloy plate is improved by three-time cold rolling, the four-time annealing step is adopted to eliminate the residual stress of the tantalum-tungsten alloy plate, and the tantalum-tungsten alloy plate is prevented from deformation and cracking in the future cutting.

Drawings

Fig. 1 is a schematic flow structure diagram of a tantalum-tungsten alloy plate processing and forming process for improving the yield.

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, a tantalum-tungsten alloy plate processing and forming process for improving yield includes the following steps:

s1, mixing raw materials, namely, taking tantalum powder with the average particle size of 3-5 mu m and tungsten powder with the average particle size of 3 mu m as raw materials, mixing the raw materials according to a certain required proportion, and putting the mixed tantalum powder and tungsten powder into a high-energy ball mill for fully mixing to obtain mixed powder;

and S2, compacting, namely placing the mixed powder on an oil press to be compacted, wherein the compacting pressure is 300-450 MPa, and the blank is obtained, and the powder mixing conditions in S1 are as follows: mixing the components in a ratio of 1: 3-1: 9 of the mixed powder is put into a high-energy ball mill for mixing, a ball milling medium is self-made tantalum balls, and the high-energy ball mill is carried out for 2-3 h under the conditions that the vacuum degree is not more than 0.1Pa and the rotating speed is 150-400 r/min;

s3: crushing the blank, putting the blank into a high-energy ball mill again for crushing to obtain blank particles, wherein the crushing conditions in S3 are as follows, and the proportion is 1: 3-1: 9 of blank is put into a high-energy ball mill for crushing, a ball milling medium is self-made tantalum balls, and the high-energy ball mill is carried out for 2-3 h under the conditions that the vacuum degree is not more than 0.1Pa and the rotating speed is 200-500 r/min;

s4: screening blanks, namely putting the blank particles into a screening machine for screening to obtain blank particles with uniform texture;

s5, performing arc melting, namely putting blank particles into a crucible of an arc melting furnace, vacuumizing until the pressure in a hearth is lower than 0.003Pa, stopping vacuumizing, filling high-purity argon to 0.05MPa, vacuumizing, repeating the vacuumizing steps for three times, and then melting to obtain the tantalum-tungsten alloy blank, wherein the arc melting step in S5 comprises the following steps of melting current 400A-500A, melting time 4-6 min, melting times 3-4 times, turning over the blank after each melting, wherein the arc melting step in S5 comprises the following steps of melting current 400A-500A, melting time 4-6 min, melting times 3-4 times, and turning over the blank after each melting;

s6: forging and shaping, namely performing hot rolling on a tantalum-tungsten alloy blank, performing vacuum annealing, performing cold rolling for three times to form a tantalum-tungsten alloy plate, wherein the forging step in S6 comprises the steps of taking out the smelted blank, performing primary hot pressing, pressing the blank into a plate blank with medium thickness through an oil press, annealing under the vacuum condition at 1250-1400 ℃, keeping the temperature for 80-120 min, performing cold rolling for three times after the annealing is finished, performing vacuum annealing for the second time at 1300-1450 ℃ after the first cold rolling in the oil press in S6, keeping the temperature for 90-130 min, performing third vacuum annealing at 1300-1500 ℃ after the second cold rolling, keeping the temperature for 90-140 min, performing vacuum annealing for the fourth time after the third cold rolling, keeping the temperature for 1400-1550 ℃ for 100-150 min, and performing surface treatment on the plate blank before the cold rolling, and the surface treatment comprises milling, grinding and polishing, the plate needs to be washed by alkali before the vacuum annealing treatment, and the plate is washed by water after the alkali washing is finished.