Posted by Gordon England on August 28, 2003 at 20:51:36:
In Reply to: Re: Tungsten Carbide/Cobalt/ posted by Tony Globe on August 16, 2003 at 18:18:44:
: I have someone telling me they're using a component manufactured from Cobalt/Chrome bonded Tungsten Carbide (because there's an alkaline aqueous fluid involved and leaching of the Cobalt binder with conventional Cobalt-bonded TC has been a problem in the past). However,
: a) I've seen a spec. sheet for the component and it says Tungsten Carbide K30, which I thought was just TC & Cobalt,
: b) It's a completely TC component, not TC-coated, and I'm not sure if TC/Co/Cr can be pressed or if it's only be applied as a coating, and
: c) Our lab's got a Scanning Electron Microscope with EDX and elemental analysis of the component surface shows only Tungsten, Cobalt, Carbon & Oxygen (no Chrome).
: Could this still be TC with Cobalt/Chrome or is it just Cobalt-bonded TC?
Hi Tony
I believe K30 is 91% WC and 9% Co, with no Cr.
K701 WC with Cr and Co binder, also consider K801 WC with Ni binder. Both should give better corrosion resistance. Not sure how much wear and mechanical properties will be compromise though.
Regards Gordon
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