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A tungsten foam with uniform and controllable pores

A foamed and uniform technology, applied in the field of foamed tungsten, can solve the problems of uneven distribution of pores of porous tungsten materials, reduce the utilization rate of commercial tungsten powder, and complicated jet classification equipment, and achieve high promotion and application value, reduce preparation costs, and increase pores The effect of distribution uniformity

Active Publication Date: 2021-06-25
西安稀有金属材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the jet grading equipment is complicated, and the tungsten powder after grading needs secondary treatment, which reduces the utilization rate of commercial tungsten powder and causes a certain degree of waste of resources; Compaction, resulting in uneven pore distribution of the generated porous tungsten material, and low product qualification rate

Method used

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  • A tungsten foam with uniform and controllable pores
  • A tungsten foam with uniform and controllable pores
  • A tungsten foam with uniform and controllable pores

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment includes the following steps:

[0029] Step 1. Weigh 150g of FW-1 type tungsten powder with a particle size of 3μm to 5μm and 150g of tungsten carbide balls into a 500mL ball mill tube, add ethanol, and then perform ball mill dispersion at a speed of 200r / min for 1h , dried at 60°C for 24 hours after filtration to obtain dispersed tungsten powder;

[0030] Step 2. Place the dispersed tungsten powder obtained in step 1 in a mold, and conduct spark plasma sintering for 10 minutes at a temperature of 800°C and a pressure of 10 MPa to obtain a rough tungsten billet;

[0031] Step 3. Place the rough tungsten blank obtained in step 2 in a vacuum atmosphere furnace, raise the temperature up to 1400°C at a rate of 10°C / min for heat preservation and sintering for 4 hours, and obtain foamed tungsten through natural cooling.

[0032] 2 The foamed tungsten prepared in this example is scanned by electron microscope after being polished and corroded in turn, the resu...

Embodiment 2

[0035] This embodiment includes the following steps:

[0036] Step 1. Weigh 150g of FW-1 type tungsten powder with a particle size of 3μm to 5μm and 450g of tungsten carbide grinding balls into a 500mL ball mill tube, add ethanol, and then conduct ball mill dispersion at a speed of 300r / min for 3h , dried at 80°C for 12 hours after filtration to obtain dispersed tungsten powder;

[0037] Step 2. Place the dispersed tungsten powder obtained in step 1 in a mold, and conduct spark plasma sintering for 30 minutes at a temperature of 1200 °C and a pressure of 50 MPa to obtain a rough tungsten billet;

[0038] Step 3. Place the rough tungsten blank obtained in step 2 in a vacuum atmosphere furnace, raise the temperature up to 2000°C at a rate of 50°C / min for heat preservation and sintering for 2 hours, and obtain foamed tungsten through natural cooling.

[0039] After the foamed tungsten prepared in this embodiment is polished and corroded successively, it is scanned by an electron...

Embodiment 3

[0041] This embodiment includes the following steps:

[0042] Step 1. Weigh 150g of FW-1 type tungsten powder with a particle size of 3μm to 5μm and 300g of tungsten carbide balls into a 500mL ball mill tube, add ethanol, and then ball mill and disperse at a speed of 250r / min for 2h , dried at 70°C for 18 hours after filtration to obtain dispersed tungsten powder;

[0043] Step 2. Place the dispersed tungsten powder obtained in step 1 in a mold, and conduct spark plasma sintering for 20 minutes at a temperature of 1000 °C and a pressure of 30 MPa to obtain a rough tungsten billet;

[0044] Step 3: Place the rough tungsten billet obtained in Step 2 in a vacuum atmosphere furnace, raise the temperature up to 1700°C at a rate of 30°C / min for heat preservation and sintering for 3 hours, and obtain foamed tungsten through natural cooling.

[0045] After the foamed tungsten prepared in this embodiment is polished and corroded successively, it is scanned by an electron microscope, a...

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Abstract

The invention discloses a foamed tungsten with uniform and controllable pores. The foamed tungsten is prepared by sintering tungsten powder dispersed by a ball mill through low-temperature and low-pressure discharge plasma sintering, and then through medium-temperature and pressure-free heat preservation sintering. The present invention uses dispersed tungsten powder as the raw material, adopts low-temperature and low-pressure discharge plasma sintering to make billets and medium-temperature pressure-free heat-preservation sintering molding in sequence, which reduces the pressure on tungsten powder during the billet making and molding process, and avoids part of the tungsten powder being compacted. , improve the uniformity of pore distribution in foamed tungsten, by changing the sintering temperature combined with pressure-free sintering, the control of pore size and uniformity can be achieved, and tungsten foam with uniform pores can be obtained; at the same time, the utilization rate of tungsten powder can be improved to avoid waste of resources , the process is simpler and more stable, and no special equipment is needed, the preparation cost is reduced, and it has higher promotion and application value.

Description

technical field [0001] The invention belongs to the technical field of tungsten material preparation, and in particular relates to a foamed tungsten with uniform and controllable pores. Background technique [0002] Due to its high melting point, high hardness, and low vapor pressure, metal tungsten has a wide range of application values ​​in high-tech fields such as aviation and aerospace. Porous tungsten is a special material that plays an irreplaceable role in the preparation of various tungsten-based alloys, such as commercial tungsten-copper alloys, tungsten-nickel-iron and other high-density tungsten alloys. The melting point material penetrates into the porous tungsten material by melting, thus forming a new tungsten alloy. [0003] At present, the preparation of porous tungsten mostly adopts the method of jet classification. First, the commercial tungsten powder is subjected to secondary classification, and then it is formed by high-pressure compacting and post-calc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/08C22C27/04
CPCB22F3/11C22C27/04
Inventor 刘璐黎栋栋张剑峰孙国栋张思雨邱龙时胡小刚潘晓龙吴金平张于胜
Owner 西安稀有金属材料研究院有限公司