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Tantalum decatungstate bar and production method for same

A production method and technology of tungsten rods, which are applied in the field of alloys, can solve the problems of low degree of microstructure breakage in the cast state, incomplete elimination of microstructures, and fracture failures.

Active Publication Date: 2013-02-13
NINGXIA ORIENT TANTALUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the as-cast structure of the forged billet obtained by the above-mentioned forging process has a low degree of fragmentation, and the internal bad structure is not completely eliminated, which leads to the quality problem of fracture failure caused by local deformation of the product under high temperature and high pressure.

Method used

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  • Tantalum decatungstate bar and production method for same
  • Tantalum decatungstate bar and production method for same
  • Tantalum decatungstate bar and production method for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1) The ingot of tantalum and tungsten is smelted three times in a vacuum electron beam furnace. The size of the ingot is φ153×150mm (diameter×length). The specific composition, specifications and standard comparison are shown in Table 1 below:

[0048] Table 1 Element content information table of tantalum ten tungsten ingots

[0049]

[0050] 2) Preheating

[0051] Use a box-type resistance furnace to heat the above-mentioned tantalum-ten-tungsten ingot. Set the temperature in the furnace to 180°C. When the temperature reaches the furnace loading time, keep it warm for 34 minutes. The low-temperature infrared temperature measurement is 165°C.

[0052] 3) Apply an anti-oxidation coating evenly on the surface of the ingot with a brush, with a thickness of about 3mm, and air-dry to room temperature.

[0053] 4) Medium frequency heating

[0054] Use medium-frequency induction coils with a diameter of φ180mm to heat the ingot coated with an anti-oxidation coating on the...

Embodiment 2

[0093] 1) The ingot of tantalum and tungsten is three times melted in a vacuum electron beam furnace. The size of the ingot is φ153×150mm (diameter×length). The specific composition, specifications and standard comparison are shown in Table 5 below:

[0094] Table 5 Example 2 tantalum ten tungsten ingot element content information table

[0095]

[0096] 2) Preheating: Preheat the tantalum and tungsten ingots with a box-type resistance furnace, heat the resistance furnace to 180°C, put the furnace into the temperature, and keep it warm for 40 minutes.

[0097] 3) Anti-oxidation coating: Evenly coat the surface of the preheated tantalum ten-tungsten ingot with a suspension of high-temperature glass powder plus water and water glass, with a coating thickness of about 3mm, and dry in the air.

[0098] 4) Medium-frequency induction heating: heat the tantalum ten-tungsten ingot obtained in step 3) with a φ180mm medium-frequency induction coil, heating with 20KW power for 4 minut...

Embodiment 3

[0137] 1) Melting tantalum and tungsten ingots to make the outer diameter ≥ φ150mm, chemical composition tungsten content 9~11wt%, sum of impurities ≤0.5wt%, single impurity ≤0.2wt%.

[0138] 2) Preheating: Preheat the tantalum and tungsten ingots with a box-type resistance furnace, heat the resistance furnace to 150°C, put the furnace into the warm furnace, and keep it warm for 40 minutes.

[0139] 3) Anti-oxidation coating: Evenly coat the surface of the preheated tantalum ten-tungsten ingot with a suspension of high-temperature glass powder plus water and water glass, with a coating thickness of about 2mm, and dry in the air.

[0140] 4) Medium-frequency induction heating: heat the tantalum-ten-tungsten ingot obtained in step 3) with a φ180mm medium-frequency induction coil, heating with 20KW power for 6 minutes, 40KW power for 7 minutes, 60KW power for 12 minutes, and 80KW power for 12 minutes. : 1400°C, the temperature difference from the center of the end face to the edg...

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Abstract

The invention provides a production method for a tantalum decatungstate bar, comprising the following steps of: a) preheating a tantalum decatungstate cast ingot, and coating an anti-oxidation coating on the surface of the preheated decatungstate cast ingot; b) placing the decatungstate cast ingot obtained in the step a) in a medium-frequency induction ring, and heating the decatungstate cast ingot under a power of 20-40 KW and a power of 60-80 KW in sequence; c) performing radial upsetting and radial drawing-out on the decatungstate cast ingot obtained in the step b), and circulating for many times; and d) annealing the decatungstate cast ingot obtained in the step c), so as to obtain the tantalum decatungstate bar. The invention further provides a tantalum decatungstate bar. According to the invention, the decatungstate cast ingot is heated under different powers, so as to be uniformly heated, thus effectively reducing the generation and the concentration of an internal stress; and forging machining adopts a mode of radial upsetting and radial drawing-out, thus improving the non-uniformity degree and the breaking degree of the state and the structure of the decatungstate cast ingot, and preventing the tantalum decatungstate bar from the problem of cracking failure in a high-temperature and high-pressure use environment.

Description

technical field [0001] The invention relates to the field of alloy technology, in particular to a tantalum ten tungsten rod and a production method thereof. Background technique [0002] In recent years, with the development of aviation, aerospace and atomic energy industries, especially the development of supersonic aircraft and return-type hypersonic space vehicles with a Mach number of 4-6, the requirements for surface skin materials and high-temperature structural materials inside the engine are increasing. higher. Metal tantalum, especially tantalum alloys, such as: tantalum-tungsten alloys can be used as heat-resistant high-strength structural materials for supersonic aircraft, rockets, and missiles, as well as parts of control and adjustment devices. The melting point of tantalum-tungsten alloy is 3080°C, and it has high temperature toughness and impact resistance. The maximum operating temperature in a vacuum environment can reach 2500°C. It can be used as surface s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/00B21J5/08
Inventor 孙伟李桂鹏汪凯同磊董超群李积贤安钢梁立
Owner NINGXIA ORIENT TANTALUM IND
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