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A method for preparing a tantalum-based alloy with a gradient structure through solid solution strengthening

A gradient structure and solid solution strengthening technology, which is applied in the field of preparation of high-strength tantalum alloys, can solve problems such as gaps, and achieve the effects of prolonging service life, excellent performance, and good coordination

Active Publication Date: 2016-01-13
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the solid-solution strengthening effect of nitrogen on tantalum is used, this technical problem can be well solved while retaining its plasticity to the maximum extent. However, the current research on high-oxygen-nitrogen tantalum-based alloys is basically blank.

Method used

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  • A method for preparing a tantalum-based alloy with a gradient structure through solid solution strengthening
  • A method for preparing a tantalum-based alloy with a gradient structure through solid solution strengthening
  • A method for preparing a tantalum-based alloy with a gradient structure through solid solution strengthening

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment includes the following steps:

[0032] Step 1. Put 400g of tantalum powder in the nitriding furnace, and adjust the nitrogen flow rate of the nitriding furnace to 0.1m 3 / h, the tantalum powder is subjected to oxynitridation treatment at 900°C for 15 minutes; the mass purity of the tantalum powder is not less than 99.5%, the particle size of the tantalum powder is not less than 200 mesh, and the oxynitride treatment process Control the volume content of oxygen in the nitriding furnace to not less than 5%;

[0033] Step 2. Put the tantalum powder treated by oxynitriding in step 1 in a plasma sintering furnace, adjust the pressure to 300MPa, and sinter the tantalum powder treated by oxynitriding at 950°C for 5 minutes to obtain Tantalum-based alloys;

[0034] Step 3. Place the tantalum-based alloy described in step 2 in a vacuum annealing furnace, and adjust the vacuum degree to 10 -2 Pa, the tantalum-based alloy was vacuum annealed at 900°C for 1h.

...

Embodiment 2

[0052] This embodiment includes the following steps:

[0053] Step 1. Put 400g of tantalum powder in the nitriding furnace, and adjust the nitrogen flow rate of the nitriding furnace to 0.12m 3 / h, the oxygen flow rate is 0.08m 3 / h, the tantalum powder is subjected to oxynitridation treatment at 800°C for 30 minutes; the mass purity of the tantalum powder is not less than 99.5%, the particle size of the tantalum powder is not less than 200 mesh, and the oxynitride treatment process Control the volume content of oxygen in the nitriding furnace to not less than 5%;

[0054] Step 2. Put the tantalum powder treated by oxynitriding in step 1 in a plasma sintering furnace, adjust the pressure to 200MPa, and sinter the tantalum powder treated by oxynitriding at 1000°C for 3 minutes to obtain Tantalum-based alloys;

[0055] Step 3. Place the tantalum-based alloy described in step 2 in a vacuum annealing furnace, and adjust the vacuum degree to 10 -1 Pa, the tantalum-based alloy w...

Embodiment 3

[0073] Step 1. Put 400g of tantalum powder in the nitriding furnace, and adjust the nitrogen flow rate of the nitriding furnace to 0.08m 3 / h, the tantalum powder is subjected to oxynitridation treatment at 1000°C for 5 minutes; the mass purity of the tantalum powder is not less than 99.5%, the particle size of the tantalum powder is not less than 200 mesh, and the oxynitride treatment process Control the volume content of oxygen in the nitriding furnace to not less than 5%;

[0074] Step 2. Put the tantalum powder treated by oxynitriding in step 1 in a plasma sintering furnace, adjust the pressure to 400MPa, and sinter the tantalum powder treated by oxynitriding at 900°C for 10 minutes to obtain Tantalum-based alloys;

[0075] Step 3. Place the tantalum-based alloy described in step 2 in a vacuum annealing furnace, and adjust the vacuum degree to 10 -3 Pa, the tantalum-based alloy was vacuum annealed at 1000°C for 0.5h.

[0076] As the distance from the surface of the tant...

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Abstract

The invention discloses a method for preparing a tantalum-based alloy with a gradient structure by virtue of solution strengthening. The method comprises the following steps: I, placing tantalum powder in a nitriding furnace for oxynitriding the tantalum powder; II, placing the oxynitrided tantalum powder in a plasma sintering furnace and sintering the oxynitrided tantalum powder so as to obtain the tantalum-based alloy; III, placing the tantalum-based alloy in a vacuum annealing furnace and carrying out vacuum annealing treatment on the tantalum-based alloy. According to the method disclosed by the invention, the tantalum powder is oxynitrided firstly, so that oxygen and nitrogen in the tantalum powder are distributed in gradient from a surface layer to a core part; then, the tantalum-based alloy is formed by sintering treatment, so that the hardness of the tantalum-based alloy is further distributed in gradient from the surface layer to the core part; finally, oxygen and nitrogen in the tantalum-based alloy are gradually diffused from the boundary to the core part by virtue of the vacuum annealing treatment, so that the mechanical property of the material can be regulated within a large range, thereby better matching the strength and plasticity of the tantalum-based alloy and prolonging the service life of the material.

Description

technical field [0001] The invention belongs to the technical field of preparation of high-strength tantalum alloys, and in particular relates to a method for preparing a tantalum-based alloy with a gradient structure through solid solution strengthening. Background technique [0002] The refractory metals tantalum and niobium are extremely versatile, but compared with their melting points, their potential strength properties are far from being discovered, and they cannot meet people's increasing application requirements. Even at low working temperature, due to its insufficient strength, it will reduce its fatigue, wear and corrosion performance, thereby shortening the service life of components. At present, tantalum or tantalum alloys are commonly used instead of gold-platinum alloys at home and abroad to make spinnerets for chemical fiber wet or dry-wet spinning, but their wear resistance is poor and they are easy to scratch, which makes it easy to work under a certain pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C27/02C22F1/18B22F1/00
Inventor 张于胜张小明牛红志卢金文白新房
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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