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Wear-resisting tungsten alloy and preparation method thereof

A technology of tungsten alloy and ammonium metatungstate, which is applied in the field of alloys, can solve problems such as growth and affecting the high-temperature performance of alloys, and achieve the effects of preventing aggregation and growth, improving practicability, and improving microhardness

Active Publication Date: 2016-05-25
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, although oxide particle dispersion strengthened alloys have made some progress, there are still some problems, mainly reflected in the size of oxide particles, especially the oxide particles will grow significantly during the sintering process, which affects the high temperature performance of the alloy. improvement

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0022] The preparation method of the wear-resistant tungsten alloy comprises the steps of:

[0023] Step 1, according to weight percentage, aluminum nitrate 21.75~34.36%, ammonium metatungstate 25.04~35.66%, citric acid 40.60~42.59%, weigh aluminum nitrate, citric acid and ammonium metatungstate; Add water to ammonium metatungstate to form aluminum nitrate aqueous solution, citric acid aqueous solution and ammonium metatungstate aqueous solution; the amount of water added is to completely dissolve aluminum nitrate, citric acid or ammonium metatungstate; the prepared aluminum nitrate aqueous solution , citric acid aqueous solution and ammonium metatungstate aqueous solution are mixed uniformly to obtain a mixed solution; the pH value of the obtained mixed solution is adjusted to 0.9-2.0, and sol-gelation is performed to obtain a gel; the obtained gel is dried and roasted get Al 2 o 3 / WO 3 mixed powder, set aside;

[0024] Step two, Al 2 o 3 / WO 3 The mixed powder is fir...

Embodiment 1

[0034] The tungsten alloy prepared in this example uses the weight percentages of the components of the raw materials as follows: 21.75% of aluminum nitrate, 35.66% of ammonium metatungstate, and 42.59% of citric acid.

[0035] The preparation method of the present embodiment tungsten alloy comprises the following steps:

[0036] 1) Weigh aluminum nitrate, ammonium metatungstate and citric acid powder according to the above weight percentage, add water respectively to make a solution, then mix the three solutions evenly, adjust the pH value to 0.9 with ammonia water, and place in a water bath with a water temperature of 90°C Place it in the pot for 6 hours to make it sol-gel, then dry it at 110°C for 24 hours to obtain a dry gel, and then bake the dry gel at 580°C for 7 hours to obtain Al 2 o 3 / W mixed powder;

[0037] 2) Add Al 2 o 3 / W The mixed powder is reduced by hydrogen at 500°C for 3 hours to reduce the tungsten trioxide in the mixed powder to tungsten dioxide, an...

Embodiment 2

[0043] The weight percentages of the raw materials used in the tungsten alloy prepared in this example are: aluminum nitrate 21.75%, ammonium metatungstate 35.66%, citric acid 42.59%.

[0044] The preparation method of the present embodiment tungsten alloy comprises the following steps:

[0045] 1) Weigh aluminum nitrate, ammonium metatungstate and citric acid powder according to the above weight percentages, and make aqueous solutions respectively, then mix the aqueous solutions of the three substances evenly, adjust the pH value to 1.5 with ammonia water, and place them in a water temperature of 90°C Place it in a water bath for 7 hours to make it sol-gel, then dry it at 110°C for 30 hours to obtain a dry gel, and then bake the dry gel at 580°C for 7 hours to obtain Al 2 o 3 / W mixed powder;

[0046] 2) Add Al 2 o 3 / W mixed powder at 550°C for hydrogen reduction for 3.5 hours to reduce tungsten trioxide in the mixed powder to tungsten dioxide, then hydrogen reduction at...

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Abstract

The invention discloses a wear-resisting tungsten alloy and a preparation method thereof. The method includes the steps that firstly, aluminum nitrate, citric acid and ammonium metatungstate are adopted as raw materials and prepared into solutions, the solutions are mixed, a sol-gel reaction is carried out, and gel is dried and roasted to obtain Al2O3 / WO3 mixed powder; then, the Al2O3 / WO3 mixed powder is subjected to hydrogen reduction to obtain Al2O3 / W mixed powder, and then the Al2O3 / W mixed powder is subjected to ball milling with a planetary ball mill; finally, sintering is carried out to obtain the tungsten alloy. In the prepared tungsten alloy material, both the alumina grain size and the tungsten grain size are very small, the tungsten grain size is 0.5-2.1 micrometers, and the alumina grain size is 50-200 nanometers. The recrystallization temperature of the prepared tungsten alloy can reach 1600 DEG C or so. Compared with a pure tungsten material, microhardness is improved by 3-20%, and high-temperature wear resistance is improved by 5-15%.

Description

technical field [0001] The invention relates to an alloy, in particular to a wear-resistant tungsten alloy and a preparation method thereof. Background technique [0002] my country is rich in tungsten resources, and its reserves and consumption of tungsten products rank first in the world. At the same time, tungsten is also a strategic resource of our country. However, the production technology of high-end tungsten products has been monopolized by foreign countries for a long time, especially the tungsten gyroscope rotors and aircraft control rudder counterweights used in high-temperature and wear-resistant environments. my country mainly relies on imports. Due to poor thermal stability, low wear resistance and short service life of domestic imitation products, the application and promotion are limited. With the rapid development of modern industry, the performance requirements of various high-end aviation, aerospace, high-speed cutting machine tools and other high-tech eq...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C27/04B22F9/22B22F3/04B22F3/10
CPCB22F3/04B22F3/10B22F9/22C22C1/05C22C27/04
Inventor 李秀青魏世忠杨晴霞徐流杰周玉成崔超鹏
Owner HENAN UNIV OF SCI & TECH
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