Production method for tantalum and tantalum alloy bars

A tantalum alloy and bar technology is applied in the field of preparation of tantalum and tantalum alloy bars, which can solve the problems of reducing the yield of tantalum bars, uneven performance of tantalum bars, and low density at both ends of the product, and achieves high production efficiency and shrinkage. The effect of uniform deformation and uniform density

Inactive Publication Date: 2014-07-16
NINGXIA ORIENT TANTALUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Such products involve a wide range, including pure tantalum rods, doped tantalum rods, tantalum-niobium alloy rods, etc. However, the vertical fusion sintering process has the following inherent disadvantages: (1) During vertical fusion sintering, the low current density at the chuck position causes The sintering temperature is low, resulting in low density at both ends of the product, which must be cut off before use. This part of the material loss directly reduces the yield of the tantalum rod; (2) The performance of each part of the vertically sintered tantalum rod is uneven. It is easy to cause quality defects such as peeling and splitting during rolling; (3) vertical melting sintering is a process in which the billet is directly energized and heated to a very high temperature for sintering and compacting, and the energy consumption is very high

Method used

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  • Production method for tantalum and tantalum alloy bars
  • Production method for tantalum and tantalum alloy bars
  • Production method for tantalum and tantalum alloy bars

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Prepare 34 tantalum bars with a single weight of 6 kg. Put 6kg of tantalum powder with a purity greater than 99.9% into a rubber sheath with an inner diameter of 32mm, insert a rubber stopper at the opening of the sheath, wait for the air in the sheath to escape, and tie the latex sheath at the rubber stopper with iron wire. Knead the covered billet evenly and clamp it with two splints, and then fix the splint and the billet together with a rubber band. Prepare 34 billets as above, and then place them in a cold isostatic pressing machine, control the maximum holding pressure to 250 MPa, and hold the pressure for 15 minutes. Complete the cold isostatic pressing molding, and finally unload the mold to obtain 34 compacts.

[0019] Put 34 compacts into a vacuum heating furnace, and gradually heat up and keep warm according to the sintering process in the table below. After reaching the final sintering temperature of 2400°C, keep warm for 8 hours. Then the temperature is l...

Embodiment 2

[0035]

[0036] According to the process in Example 1, the proportion of 60% of tantalum powder and 40% of niobium powder is taken by weight, and it is formed and sintered by vacuum indirect heating.

[0037] Then roll them into Ф3mm round tantalum-niobium alloy strips respectively, with H 2 S0 4 : HN0 3 : HF=5:3:3 (volume ratio, the molar concentrations of the three are 18.4mol / L, 16mol / L, and 22.8mol / L in turn) pickling, washing and drying, and then annealing in a vacuum annealing furnace. The annealing conditions are such as 1200° C. and holding for 120 minutes.

[0038] After annealing, the circular tantalum wire is continuously drawn to Ф0.19mm, and then cleaned again, dried naturally, and then straightened for multiple rounds, and then coiled, and then tested for physical properties, chemical impurities, and electrical properties of the product. Then it is packaged and put into storage, and the preparation of the tantalum-niobium alloy wire is completed.

[0039] ...

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Abstract

The invention relates to a production method for tantalum and tantalum alloy bars. The production method is characterized by including the following steps: putting prepared tantalum or tantalum alloy powder into cylindrical rubber jackets, subjecting the rubber jackets to kneading, forming and sealing, disposing the jackets in a cold isostatic press, completing cold-isostatic-pressing forming through pressurization, pressure maintenance and pressure relief, and stripping molds to acquire press blanks of the tantalum bars; sintering the press blanks by a indirect vacuum heating mode, controlling the sintering temperature within the range of 2100 DEG C to 2800 DEG C, and keeping the temperature for 3-20 hours to acquire cylindrical sintering blank strips. According to the production method, the cylindrical rubber jackets are adopted for cold isostatic pressing, so that blank density is uniform and blank strength is high; a heating furnace is adopted for sintering, and the overall press blanks are heated evenly and have the same contraction distortion, so that the acquired sintering blank strips are uniform in density, internal quality of products is improved, top cropping of the products is not needed, and casting yield of the tantalum bars is greatly increased.

Description

technical field [0001] The invention relates to a method for preparing tantalum and tantalum alloy rods. Background technique [0002] The existing production of tantalum rods for capacitor-level anode lead wires, tantalum ingots and other products is generally sintered by vertical melting and sintering technology. The sintering effect of tantalum and tantalum alloy rods mainly has the following points: ① Metal densification, close to the theoretical sintering density; ② Reduce harmful impurities, such as O, C, N, Fe, Ni, Cr, Mg, etc., thereby improving processing performance , to obtain the final product properties. [0003] Such products involve a wide range, including pure tantalum rods, doped tantalum rods, tantalum-niobium alloy rods, etc. However, the vertical fusion sintering process has the following inherent disadvantages: (1) During vertical fusion sintering, the low current density at the chuck position causes The sintering temperature is low, resulting in low d...

Claims

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Application Information

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IPC IPC(8): B22F3/16
Inventor 张晓万庆峰刘云峰解永旭马跃忠童泽堃王春翔崔新民韩鹏郭林波马建政
Owner NINGXIA ORIENT TANTALUM IND
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