Method for preparing WC/W composite powder through in-situ reaction

A composite powder and in-situ reaction technology, which is applied in the field of in-situ reaction to prepare WC/W composite powder, can solve problems such as agglomeration and affect the properties of tungsten-based alloys, and achieve the effect of improving high temperature performance.

Active Publication Date: 2016-06-01
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, WC, as an additional particle, inevitably agglomerates during the preparation process, which affects the performance of the tungsten-based alloy.

Method used

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  • Method for preparing WC/W composite powder through in-situ reaction

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Step 1, W powder surface pre-plant defect treatment:

[0026] A 40% HF solution and NH 4 Add 40mlHF and 2gNH to F particles according to 1L distilled water 4 Mix the proportion of F to obtain the pickling solution; add 10gW powder to the prepared pickling solution according to the specific gravity of 1L pickling solution, add W powder to the pickling solution, ultrasonically shake for 30min at room temperature, and use deionized water Wash the powder 3 times, and dry it in a vacuum oven at 100°C for 2 hours to obtain W powder with pre-planted defects on the surface;

[0027] Step 2, prepare WC / W composite powder:

[0028] Spread the W powder with pre-planted defects on the surface obtained in step 1 in a corundum crucible, place the crucible horizontally in the middle of the heating body of the tube furnace, and then under the protection of an Ar atmosphere with a flow rate of 1L / min, heat at 10°C / min. The heating rate of min reaches 1000°C, acetone is carried by arg...

Embodiment 2

[0030] Step 1, W powder surface pre-plant defect treatment:

[0031] A 40% HF solution and NH 4 Add 60mlHF and 3gNH to F particles according to 1L distilled water 4 Mix the proportion of F to obtain the pickling solution; add 10gW powder to the prepared pickling solution according to the specific gravity of 1L pickling solution, add W powder to the pickling solution, ultrasonically shake for 45min at room temperature, and use deionized water Wash the powder 5 times, and dry it in a vacuum oven at 80°C for 8 hours to obtain W powder with pre-planted defects on the surface;

[0032] Step 2, prepare WC / W composite powder:

[0033] Spread the W powder with pre-planted defects on the surface obtained in step 1 in a corundum crucible, place the crucible horizontally in the middle of the heating body of the tube furnace, and then under the protection of an Ar atmosphere with a flow rate of 1L / min, heat at 10°C / min. The heating rate of min reaches 800°C, and acetone is carried by a...

Embodiment 3

[0035] Step 1, W powder surface pre-plant defect treatment:

[0036] A 40% HF solution and NH 4 Add 80mlHF and 3gNH to F particles according to 1L distilled water 4 Mix the proportion of F to obtain the pickling solution; add 10gW powder to the prepared pickling solution according to the specific gravity of 1L pickling solution, add W powder to the pickling solution, ultrasonically shake for 60min at room temperature, and use deionized water Wash the powder 4 times and dry it in a vacuum oven at 50°C for 4 hours to obtain W powder with surface pre-planted defects;

[0037] Step 2, prepare WC / W composite powder:

[0038] Spread the W powder with pre-planted defects on the surface obtained in step 1 in a corundum crucible, place the crucible horizontally in the middle of the heating body of the tube furnace, and then under the protection of an Ar atmosphere with a flow rate of 1L / min, heat at 10°C / min. The heating rate of min reaches 600°C, and acetone is carried by argon to ...

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Abstract

The invention discloses a method for preparing WC / W composite powder through an in-situ reaction. Tungsten powder is poured into a pickling solution, cleaning is conducted after room-temperature ultrasonic oscillation, and then vacuum drying is carried out to obtain W powder with pre-planted defects on the surface; and the W powder with the pre-planted defects on the surface is flatly spread in a corundum crucible, the crucible is horizontally placed in the middle of a tube furnace heating body, then the temperature is increased under the protection of the Ar atmosphere, argon carrying acetone is subjected to the in-situ reaction with the W powder, the temperature is slowly increased for 0.5-4 h, then introduction of the acetone is stopped, and the protective gas is stopped when the temperature of a furnace body is decreased to the room temperature, so that the WC / W composite powder is obtained. According to the WC / W composite powder obtained through the method, WC particles (whiskers) distributed on the surfaces of W particles in a scattered mode can improve the high-temperature property of tungsten-based alloy on the one hand, and on the other hand, a pinning effect is achieved on the strength of the alloy. Accordingly, the high-temperature property of the tungsten-based alloy can be improved when the WC / W composite powder is used for preparing the tungsten-based alloy as original powder.

Description

technical field [0001] The invention belongs to the technical field of composite powder preparation, and in particular relates to a method for preparing WC / W composite powder by in-situ reaction. Background technique [0002] Because of its high melting point, high hardness, and low thermal expansion coefficient, tungsten-based alloys are widely used in high-temperature-resistant components such as electrical contacts for high-voltage switches, throat linings of various missiles, gas rudders, and nose cones. Has good high temperature performance. But any metal will soften at high temperature, for example, the compressive strength of traditional CuW70 composite material at 900°C is only about 17% of that at room temperature. As a reinforcing phase, ceramic particles (whiskers) have the same mechanical properties at high temperature as at room temperature, so introducing ceramic particles (whiskers) as a reinforcing phase is the best choice to improve the high temperature per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/26
CPCB22F9/26
Inventor 梁淑华张乔宋晓艳卓龙超邹军涛
Owner XIAN UNIV OF TECH
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