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Material of stirring head for friction stir welding and preparation method thereof

A friction stir welding and stirring head technology, which is applied in welding equipment, non-electric welding equipment, manufacturing tools, etc., can solve the problems of decreased wear resistance, high price, degradation of mechanical properties, etc., and achieves improved shaping and less impurities. , the effect of sintering change

Active Publication Date: 2019-08-09
CHINA-UKRAINE INST OF WELDING GUANGDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the tungsten-based materials used in the market are mainly tungsten-rhenium alloys. The ratio of tungsten-rhenium alloys is (W-25wt.% Re), which is expensive, and the mechanical properties of the materials degrade seriously at higher temperatures, and the wear resistance declined

Method used

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preparation example Construction

[0021] A preparation method of a stirring head material for friction stir welding, comprising:

[0022] Mix tungsten powder, rhenium powder and ZrC by ball milling;

[0023] The mixed powder after ball milling is subjected to hydrogen reduction to remove impurities;

[0024] The mixed powder after impurity removal is sequentially subjected to hot pressing, densification by swaging and cleaning.

[0025] In detail, before the step of ball milling the tungsten powder, rhenium powder and ZrC, it further includes: ball milling the tungsten powder with a particle size of 3-20 μm and the rhenium powder with a particle size of 5-20 μm. The optimized ball milling process first adopts the horizontal ball milling method, the particle size of the tungsten (rhenium) powder is kept in a spherical shape, and it is not easy to appear the obvious bottom sinking of the vertical ball mill, which will cause different shapes of the material and affect the sintering process. At the same time, by...

Embodiment 1

[0041] This embodiment provides a stirring head material for friction stir welding, which is prepared by the following preparation method:

[0042] S1: Through the ball milling process, the tungsten powder with a particle size of 3 μm and the rhenium powder with a particle size of 5 μm are processed to obtain spherical fine tungsten particle size and rhenium particle size.

[0043] S2: Then tungsten powder and rhenium powder are mixed with ZrC ball mill, and argon-hydrogen mixed gas is introduced during the powder mixing process, the mixing ratio H2: Ar=1:5, the ball mill speed is controlled at 210rpm / min, and the ball mill time is 5h.

[0044] S3: The ball-milled powder is subjected to hydrogen reduction to remove impurities at a reduction temperature of 750° C. for 2 hours.

[0045] S4: The graphite mold is used to prepare the billet by the hot pressing method, and the vacuum pressureless sintering is carried out before the pressurization, the sintering time is 2 hours, and ...

Embodiment 2

[0049] This embodiment provides a stirring head material for friction stir welding, which is prepared by the following preparation method:

[0050] S1: Through the ball milling process, the tungsten powder with a particle size of 10 μm and the rhenium powder with a particle size of 20 μm are processed to obtain spherical fine tungsten particle size and rhenium particle size.

[0051] S2: Then mix tungsten powder, rhenium powder and ZrC by ball milling. During the powder mixing process, argon-hydrogen mixed gas is introduced. The mixing ratio H2: Ar=1:4. The ball milling speed is controlled at 300rpm / min, and the ball milling time is 5h.

[0052] S3: The ball-milled powder is subjected to hydrogen reduction to remove impurities at a reduction temperature of 850° C. for 3 hours.

[0053] S4: The graphite mold is used to prepare the billet by hot pressing method, and vacuum pressureless sintering is carried out before pressing, the sintering time is 2 hours, and the holding tempe...

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Abstract

The invention discloses a material of a stirring head for friction stir welding and a preparation method thereof, and relates to the technical field of the friction stir welding. The material of the stirring head is prepared from W, 10%-20% by weight of Re and 0.3%-1.0% by weight of ZrC. By adding the nano ZrC into the material of the stirring head, the cost can be effectively reduced on the basisof ensuring the mechanical property and the high-temperature wear resistance of the material. According to the preparation method, it is ensured that the added ZrC material can exist in a nanometer form, and stress concentration can be effectively avoided due to good high-temperature stability of the ZrC material.

Description

technical field [0001] The invention relates to the technical field of friction stir welding, and in particular to a stirring head material for friction stir welding and a preparation method thereof. Background technique [0002] Friction Stir Welding (FSW) is a new type of solid phase joining technology. During the welding process, the nugget area does not melt, which can avoid the appearance of coarse grain structure and ceramic particle strengthening phase (such as Y 2 o 3 、Al 2 o 3 ) and molten matrix delamination and other issues. Therefore, FSW has unique advantages in welding aluminum, magnesium low melting point materials, ultra-fine grain steel, particle dispersion strengthened steel and titanium alloy. However, the application of FSW in the connection of high melting point materials is limited. One of the main reasons is that the structure of the stirring head material is unstable and the function fails. As the core component of FSW, the stirring head needs to...

Claims

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Application Information

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IPC IPC(8): B23K20/12C22C29/06
CPCB23K20/1255C22C29/067
Inventor 苗澍赵运强谭锦红董春林王春桂易耀勇
Owner CHINA-UKRAINE INST OF WELDING GUANGDONG ACAD OF SCI
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