Tungsten Carbide

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Tungsten Carbide

• By
• Steven Staten
• MEEN 3344

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What is Tungsten Carbide ?

• A Ceramic
• Tungsten is a Refractory Metal with the highest
  melting temp. at 3410C
• The Knoop hardness is around 2100
• The mixture of the two reduces cost for tools.

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How it is dressed to the tool

• Mill or shoe is heated to where the pores of the
  iron open
• Then the brazing alloy made of copper and a high
  nickel content is melted down and bonded into the
  irons pores.
• This bonds the tungsten carbide to the mill

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What is it used for?

• For downhole cutting and milling
• The removal of loose junk such as bit cones,
  packers, tong dies, and cement.
• The abrasive surface of the mills from the
  tungsten-carbide is what does the cutting.
• When cutting is done, the object that was being
  cut is now small shavings that can be circulated
  out.

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References

• Callister, William D Jr. Materials Science and
  Engineering An Integral Approach 2nd Edition.,
  John Wiley and Sons INC. 2005
• http//www.bakerhughesdirect.com
• http//www.bakerhughes.com/bot/images/fishing_serv
  ices/pathmaker_mill.jpg