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Preparing method of superfine/nano tantalum tungsten composite powder and superfine/nano tantalum tungsten composite powder prepared through same

A technology of composite powder and nano-tantalum, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc.

Active Publication Date: 2016-08-17
JIUJIANG TANBRE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are no relevant reports on the preparation of ultrafine / nano-tantalum-tungsten composite powders in the existing technology.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0061] The invention provides a preparation method of ultrafine / nanometer tantalum-tungsten composite powder, which includes using fluorotantalic acid solution and tungstate as raw materials, including sol-co-precipitation, hydrogen reduction, alkali metal reduction, and magnesium reduction to remove oxygen. The specific operations The steps are:

[0062] I. Sol-Co-precipitation

[0063] First add the calculated amount of ammonium paratungstate or ammonium metatungstate powder into the fluorotantalic acid solution, and then add 0.1% to 3% of the volume of the fluorotantalic acid solution selected from PEG-400, PEG-600, PEG-1000 and PEG-2000 One or more surfactants, stirred to prepare a sol solution; then, under ultrasonic vibration or stirring, slowly add ammonia water to pH=9-12, let stand and age for 20 minutes to 4 hours, detect and adjust the pH of the solution pH value to the pH value before standing, suction filtration; the precipitate is washed with drum ammonia hot pu...

Embodiment 1

[0081]Example 1 Preparation of Ta-10wt%W Ultrafine / Nanocomposite Powder

[0082] Step 1, sol-co-precipitation

[0083] (1) Weigh 406g of ammonium paratungstate (APT) and dissolve it into a container containing 30L of fluorotantalic acid solution, and add dropwise 300ml of surfactant polyethylene glycol PEG-600, and stir thoroughly for 30 minutes to obtain a sol solution; wherein tantalum fluoride The acid solution is calculated as tantalum oxide, the concentration is 100g / L, and the HF concentration is 1.2mol / L.

[0084] (2) Slowly add concentrated ammonia water (concentration 9.6N) in the sol solution, stir constantly while adding, until the pH=9~10 of solution, stop dripping strong ammonia water, leave standstill after 30 minutes, detect the change of pH value, ensure The pH value of the solution=9~10.

[0085] (3) Use a suction filter to filter the precipitate, and sequentially use 0.3 mol / L drum ammonia hot pure water at 75°C to fully wash and filter the precipitate unt...

Embodiment 2

[0095] Implementation 2 Preparation of Ta-20wt%W Ultrafine / Nanocomposite Powder

[0096] Step 1, sol co-precipitation

[0097] (1) Weigh 916g of ammonium paratungstate (APT) and dissolve it in a plastic bucket containing 30L of fluorotantalic acid solution, add dropwise 300ml of surfactant polyethylene glycol PEG-1200, and stir thoroughly for 30 minutes. A sol solution was obtained; wherein the tantalum fluoride solution was calculated as tantalum oxide, the concentration was 100 g / L, and the HF concentration was 1.2 mol / L.

[0098] (2) Slowly add concentrated ammoniacal liquor (concentration 9.6N) in the sol solution, stir constantly while adding, until the pH value of solution is slightly greater than 9, stop dripping concentrated ammoniacal liquor, leave standstill and detect pH value change after 30 minutes, ensure The pH of the solution was 9.

[0099] (3) Use a suction filtration system to filter the precipitate, and use 40-50°C ammonia concentration of 0.3mol / L dru...

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Abstract

The invention provides a preparing method of a superfine / nano tantalum tungsten composite powder. Adopting a fluorotantalic acid solution and tungstate as raw materials, the preparing method of the superfine / nano tantalum tungsten composite powder comprises the steps of firstly adding calculated amount of tungstate powder into the fluorotantalic acid solution, and then adding a surface active agent to prepare a sol solution; then adding an alkaline precipitant until pH is equal to 9 to 12, and precipitating to obtain a tantalum tungsten precursor composite powder; then carrying out hydrogen reduction, alkali metal reduction and magnesium reduction and deoxygenization to obtain the superfine / nano tantalum tungsten composite powder. The invention furthermore provides the superfine / nano tantalum tungsten composite powder prepared through the preparing method, wherein the grain size ranges from 10nm to 200nm, and the mass percent of tungsten ranges from 2.5 percent to 70 percent. According to the superfine / nano tantalum tungsten composite powder provided by the invention, the tantalum and tungsten components are distributed uniformly, and the sintering activity is high.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a method for preparing tantalum-tungsten composite powder and the prepared tantalum-tungsten composite powder. technical background [0002] Tantalum-tungsten (Ta-W) alloy is widely used because of its high density, high melting point, high elastic modulus, high ductility, good processing performance, high temperature strength, corrosion resistance, weldability and low plastic-brittle transition temperature. Widely used in aerospace, national defense, chemical and nuclear industries and other fields. Adding tungsten to tantalum can form a solid solution alloy, which plays a role in solid solution strengthening and grain refinement. With the increase of tungsten content, the performance of tantalum-tungsten alloy at room temperature and high temperature will be significantly improved. [0003] Tantalum-tungsten alloys are usually prepared by vacuum electron...

Claims

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Application Information

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IPC IPC(8): B22F9/20B22F9/22B22F1/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00B22F9/20B22F9/22B22F1/054
Inventor 陈玉柏宁小群宋金华郭永忠范景莲胡根火朱芳刘强戴和平
Owner JIUJIANG TANBRE
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