Improving the density of tungsten

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    Density Tungsten
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Discussion Overview

The discussion revolves around methods to improve the density of bulk tungsten, specifically aiming to increase the density from approximately 84% to over 95%. The focus is on post-sintering techniques, as the original poster does not wish to alter their sintering process.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests refining the tungsten from ore and questions the presence of contaminants, noting the energy-intensive nature of melting tungsten.
  • Another participant proposes melting the tungsten into the shape of a long rod and suggests a slow melting process, followed by cutting off the ends.
  • A later reply inquires about the appropriate crucible material for molten tungsten.
  • One participant mentions that tungsten is typically compacted by sintering and discusses various methods of compaction, including isostatic compression, to achieve desired density and mechanical properties.
  • Another participant suggests floating zone melting as a potential method, while also questioning the availability of suitable equipment.
  • One participant requests additional information about the project, including details about the intended use, shape, quantity, and available equipment.

Areas of Agreement / Disagreement

Participants have raised multiple competing views on methods to improve tungsten density, and the discussion remains unresolved with no consensus on a specific approach.

Contextual Notes

Participants have not provided detailed assumptions regarding the current process or the specific contaminants affecting density. The discussion also lacks clarity on the exact conditions under which the proposed methods would be effective.

Who May Find This Useful

This discussion may be useful for individuals involved in materials science, metallurgy, or those working with tungsten in industrial or experimental contexts.

kafri09
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hey all.

i am making a sample of bulk tungsten.
but i am getting only about 84% denstiy...

can anyone suggest a mathod of improving it?
i do not want to change my sintering process so the method should be after i get the bulk...

so... anyone can suggest a process to go from 84% bulk to about 95%+

(i am thinking of electric current or somthing like that...)

any reading materials on the subject would be great...

thanks!
 
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Are you refining it from tungsten ore? What kind of contaminants are left in the mix? You already know how hot tungsten has get to melt so it will for sure be energy intensive if all you have in your kit are thermal techniques.
 
Try melting it the shape of a long rod. Melt it slow and long. Cut off the top and bottem
 
notinthebox said:
Try melting it the shape of a long rod. Melt it slow and long. Cut off the top and bottem

And what shall be the crucible material for molten tungsten, please?
 
kafri09 said:
i am getting only about 84% density...

Do I remember that tungsten is compacted by sintering?
Wikipedia should bring some details.

Anyway, all alloys are compacted after melting, sometimes to get their normal mechanical properties, sometimes just to get a reasonable density. It parts can't be laminated, extruded... they undergo processes like isostatic compression. If not, they stay too weak.
 
Floating zone melting is an option I guess. A vertical tungsten bar can suspend itself, but I guess you wouldn't ask if you had the appropriate oven. Can't you just buy it from Goodfellow?
 
Can you give us some more info?
1 Is this for home or a commercial product?
2 what is its shape
3 are you making more then one at a time
4 Are you handy and safety minded?
5 can you make or get equipment
6 what is the weight of the end product
7 what size is it
8 what is the mold made of
9 what temp are you heating it to now
10 do you have a work shop now
 

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