Tungsten CarbideTungsten Carbide

ByBy

Steven StatenSteven Staten

MEEN 3344MEEN 3344

What is Tungsten Carbide ? What is Tungsten Carbide ?

A CeramicA Ceramic Tungsten is a Refractory Metal with the Tungsten is a Refractory Metal with the

highest melting temp. at 3410highest melting temp. at 3410°C°C The Knoop hardness is around 2100The Knoop hardness is around 2100 The mixture of the two reduces cost for The mixture of the two reduces cost for

tools.tools.

How it is dressed to the toolHow it is dressed to the tool

Mill or shoe is heated to where the pores Mill or shoe is heated to where the pores of the iron openof the iron open

Then the brazing alloy made of copper Then the brazing alloy made of copper and a high nickel content is melted down and a high nickel content is melted down and bonded into the iron’s pores.and bonded into the iron’s pores.

This bonds the tungsten carbide to the This bonds the tungsten carbide to the millmill

What is it used for?What is it used for?

For downhole cutting and millingFor downhole cutting and milling The removal of loose junk such as bit cones, The removal of loose junk such as bit cones,

packers, tong dies, and cement.packers, tong dies, and cement. The abrasive surface of the mills from the The abrasive surface of the mills from the

tungsten-carbide is what does the cutting.tungsten-carbide is what does the cutting. When cutting is done, the object that was When cutting is done, the object that was

being cut is now small shavings that can be being cut is now small shavings that can be circulated out.circulated out.

References:References:

Callister, William D Jr. “Materials Science Callister, William D Jr. “Materials Science and Engineering An Integral Approach 2and Engineering An Integral Approach 2ndnd Edition.”, John Wiley and Sons INC. 2005Edition.”, John Wiley and Sons INC. 2005

http://www.bakerhughesdirect.comhttp://www.bakerhughesdirect.com http://www.bakerhughes.com/bot/http://www.bakerhughes.com/bot/

images/fishing_services/images/fishing_services/pathmaker_mill.jpgpathmaker_mill.jpg