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Novel tantalum-tungsten alloy material and preparation method thereof

A tantalum-tungsten alloy and a new type of technology are applied in the field of new-type tantalum-tungsten alloy materials and their preparation, which can solve the problems of narrow powder metallurgy process control range and difficulty in reduction, and achieve broad application prospects and promotion value, short production cycle, good quality The effect of comprehensive performance

Inactive Publication Date: 2022-03-08
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Ta is a typical lithophile element, and has a strong oxophilicity, once combined with oxygen, it is difficult to restore; and WB 2 It has a special lamellar crystal structure and high covalent bonds, so if you want to prepare high-performance Ta-W-WB 2 Materials, strict requirements on process control, and powder metallurgy process control range is very narrow

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The preparation method of a kind of novel tantalum-tungsten alloy material of the present invention is as follows:

[0017] Step 1, select the tantalum (Ta) powder that purity and particle size are respectively 99.999% and 30nm, the tungsten (W) powder that purity and particle size are respectively 99.996% and 70nm and the tungsten diboride that purity and particle size are respectively 99.997% and 50nm (WB 2 ) powder as the raw material, and the weight ratio is controlled at 82:10:8. After weighing with a high-precision balance, put it into a ceramic ball mill jar and vacuumize it. The final vacuum degree is 10 -3 Pa;

[0018] Step 2. Put the ceramic ball mill pot into the ball mill for ball milling. The ball milling time is 6 hours. Take out the mixed powder and fill it into the graphite mold. Before filling, coat the inner wall of the mold with hBN powder to prevent the mixed powder from reacting with the graphite and to facilitate subsequent removal. mold;

[001...

Embodiment 2

[0022] The preparation method of a kind of novel tantalum-tungsten alloy material of the present invention is as follows:

[0023] Step 1, selecting tantalum (Ta) powder with purity and particle size of 99.999% and 200nm respectively, tungsten (W) powder with purity and particle size of 99.996% and 200nm respectively, and tungsten diboride with purity and particle size of 99.997% and 200nm respectively (WB 2 ) powder as the raw material, and the weight ratio is controlled at 99:0.5:0.5. After weighing with a high-precision balance, put it into a ceramic ball mill jar, and vacuumize it. The final vacuum degree is 10 -3 Pa;

[0024] Step 2. Put the ceramic ball mill pot into the ball mill for ball milling. The ball milling time is 1 hour. Take out the mixed powder and fill it into the graphite mold. Before filling, coat the inner wall of the mold with hBN powder to prevent the mixed powder from reacting with the graphite and facilitate the subsequent removal. mold;

[0025] S...

Embodiment 3

[0028] The preparation method of a kind of novel tantalum-tungsten alloy material of the present invention is as follows:

[0029] Step 1, selecting tantalum (Ta) powder whose purity and particle size are respectively 99.999% and 100nm, tungsten (W) powder whose purity and particle size are respectively 99.996% and 100nm, and tungsten diboride whose purity and particle size are respectively 99.997% and 100nm (WB 2 ) powder as the raw material, and the weight ratio is controlled at 96:2:2. After weighing with a high-precision balance, put it into a ceramic ball mill jar and vacuumize it. The final vacuum degree is 10 -3 Pa;

[0030] Step 2. Put the ceramic ball mill pot into the ball mill for ball milling. The ball milling time is 1.5 hours. Take out the mixed powder and fill it into a graphite mold. Before filling, coat the inner wall of the mold with hBN powder to prevent the mixed powder from reacting with graphite and facilitate follow-up. demoulding;

[0031] Step 3. Pu...

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Abstract

The invention relates to a novel tantalum tungsten material and a preparation method thereof. The novel tantalum tungsten material comprises the following components in percentage by weight: 0.5-10% of tungsten, 0.5-8% of tungsten diboride and the balance of tantalum. The preparation method comprises the following steps: firstly, selecting high-purity Ta powder, W powder and WB2, weighing by using a balance according to a preset proportion, carrying out vacuum ball milling for 1-6 hours, then filling the mixed powder into a graphite mold, and coating hBN on the inner wall of the mold before filling to prevent the mixed powder from reacting with graphite and facilitate subsequent demolding, so as to obtain a finished product. And then the mold is placed in a vacuum hot-pressing sintering furnace for hot-pressing sintering forming, the sintering temperature is 2550-2830 DEG C, the sintering pressure is 35-40 MPa, heat preservation is conducted, the pressure maintaining time is 1-2.5 h, the vacuum degree is 10 <-3 >-10 <-5 > Pa, cooling is conducted along with the furnace after sintering is completed, and the novel tantalum-tungsten material is obtained. The technological process is simple, and the prepared tantalum-tungsten material has good comprehensive performance, can be used for harsh working conditions of high temperature, abrasion, corrosion and intense radiation interaction, and has very wide application prospects and popularization value.

Description

technical field [0001] The invention relates to the technical field of metal composite materials, in particular to a novel tantalum-tungsten alloy material and a preparation method thereof. Background technique [0002] Metal tantalum (Ta) has significant advantages such as high melting point (up to 2995°C), low thermal expansion coefficient, extremely high corrosion resistance, and good ductility. It can be used to make solid electrolytic capacitors with large capacity, small size, and stable performance, and petrochemical heat exchange Tanks, towers, pipes and valves of tanks, heaters, concentrators and reactors. Moreover, tantalum also has stability and healing properties with human tissues, and can be used as surgical supplement materials and artificial bones, as well as bone plates, screws, clips, and suture needles. However, the hardness and strength of pure tantalum are low. The hardness of ordinary pure tantalum is only 140HV, and the bending strength at room temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/02C22C32/00C22C1/05B22F9/04B22F3/14
CPCC22C27/02C22C32/0073C22C1/05B22F9/04B22F3/14B22F2009/043
Inventor 杨晴霞魏世忠李秀青徐立友仲志丹席志强张连重马心坦郭占正
Owner HENAN UNIV OF SCI & TECH