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Need a definition for cemented carbides...

Need a definition for cemented carbides...

Need a definition for cemented carbides...

(OP)
Freinds:

I am no metalurgist and I am struggling with a way to define cemented carbides as a group e.g. tungten carbide, etc.  Is there a commonly recogogized denominator, between a tungten carbide and cerbide? I would appreciate any direction or advise anyone could provide me.

thanks,

Dan Streibig

RE: Need a definition for cemented carbides...

If you are looking for the definition of what constitutes cemented carbides, here is a good description;

http://www.azom.com/details.asp?ArticleID=169

Typically,  a carbide is a compound that is formed between one or more carbon atoms and one or more metal atoms - like tungsten carbide (WC) or iron carbide (Fe3C), etc. Once formed, they are normally very hard, and brittle compounds. Some carbides, depending on lattice structure, can be classified as ceramics.

RE: Need a definition for cemented carbides...

ASM Handbook Volume 2 uses the following distinctions:

Cemented carbide: belong to a class of hard, wear-resistant, refractory materials in which the hard carbide particles are bound together, or cemented, by a soft and ductile metal binder.  The authors (from Kennametal) limited the article to tungsten carbide cobalt-based materials.

Metal-bonded titanium carbide materials and steel-bonded tungsten carbide are part of the cermet category.  Cermet is described as an acronym that is used worldwide to designate a heterogeneous combination of metal(s) or alloy(s) with one or more ceramic phases in which the latter constitutes approximately 15 to 85% by volume and in which there is relatively little solubility between metallic and ceramic phases at the preparation temperature.

Ceramics are defined as any of a class of inorganic, nonmetallic products which are subject to a high temperature during manufacture or use.  Typically, but not exclusively, a ceramic is a metal oxide, boride, carbide, or a mixture or compound of such materials; that is, they include anions that play important roles in atomic structures and properties.  This definition of ceramic components could be broadened to include nitrides, carbonitrides, and silicides.

RE: Need a definition for cemented carbides...

I believe Cerbide is a tradename for a “binderless” cemented tungsten carbide.    What is commonly called tungsten carbide is actually tungsten carbide grains cemented with metal such as cobalt, carbide, nickel, etc.   The metal binder gives a great deal of strength but wears rapidly and is subject to corrosive attack.

By eliminating the binder you get a material with much greater wear properties which can work especially well in very low impact applications such as nozzles.     

It is my understanding (might be correct, might not but I think I am pretty close) that binderless carbide is actually cemented carbide with a very low binder content.

So Cerbide is actually a cemented carbide.  

Tom Walz
   

RE: Need a definition for cemented carbides...

(OP)
Gentlemen,

Thank you for your advice! This appears to be exactly what I need. Now to finish my project writeup...

Cheers,

Dan

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