Re: Tungsten carbide

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi Malcolm,

The carbides that look like shiny metallics seem to be fine.  Avoid the
gray dull looking kind.  They seem more ceramic than metal.  the all look
fine with an ohmmeter but arc travel just on the surface of the gray stuff.

Cheers,

	Terry

At 08:53 AM 9/24/2001 +1200, you wrote:
>Hi all,
>        As I've said in the past, I've had excellent results with 
>tungsten carbide. I'm amazed to see there are so many different 
>"flavours" available. So what type do I use I hear you ask? Well, I 
>get my gap electrodes made by a local toolmaker who carries some 
>stock, presumably for making cutting tools. I know it will be pretty 
>hard stuff. I will ring them later and if I can find out which type 
>they use, I'll post to the list.
>
>Malcolm
>
>
>On 22 Sep 2001, at 22:07, Tesla list wrote:
>
>> Original poster: "brian by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
><ka1bbg1-at-mcttelecom-dot-com>
>> 
>> Hi, also some of the powder mixes are sometimes coated with exotic materials
>> as a particle coat and when melted(sintered and pressed) that material now
>> adds another propietary mix surely not to be announced.
>> i do know if it was made by Tan-Tung then it will have tantalum and tungsten
>> mixture and few other materials. tan-tung usually isnt magnetic(the way i
>> find tan-tung cutting tools) when mixed with other tool steels. it also cost
>> substantially more. There are more TCarbide mixes than we realize, most are
>> propietary,there must be 1,000's of recipies. cul Brian f.
>> ----- Original Message -----
>> From: "Tesla list" <tesla-at-pupman-dot-com>
>> To: <tesla-at-pupman-dot-com>
>> Sent: Friday, September 21, 2001 2:34 PM
>> Subject: Tungsten carbide
>> 
>> 
>> > Original poster: "Luc by way of Terry Fritz <twftesla-at-qwest-dot-net>"
>> <ludev-at-videotron.ca>
>> >
>> > Hi Terry, Marc, list,
>> >
>> > May be I have an explanation other than solder diffusion of why
>> > some have good success with tungsten carbide electrode and some
>> > have poor result ( erosion ).
>> >
>> > TC are kind of ceramic composed of a variety of different
>> > material and proportion of TC content vary from 98% to as low as
>> > 60%. Some used titanium carbide as addition, from what I know
>> > titanium have poor reaction to arc.
>> >
>> > In conclusion TC are made of WC, Ni, Co, Cu, TiC, Fe, etc. in
>> > different ratio.
>> >
>> > See these link:
>> >
>> > http://www.generalcarbide-dot-com/grades/
>> >
>> > http://www.chinatungsten-dot-com/ctcgp.htm
>> >
>> > http://www.leechcarbide-dot-com/grade.htm
>> >
>> > The question is what is the best grade of TC can be use as
>> > electrode? What is the best binder; nickel or cobalt? What
>> > proportion of WC is the best? Probably the higher, other material
>> > are added mostly for lowering the brittelness of the TC.
>> >
>> > I think the question could be ask to an association of mfr. of
>> > TC, I'm sure one of you with a better english writing ability
>> > than me  could write to them, I think of a kind of list of the
>> > best grade to the worst because may be the kind of shape we need
>> > for electrode are not produced with the best grade for resistance
>> > to arc erosion.
>> >
>> > Cheers,
>> >
>> > Luc Benard
>> >
>> >
>> >
>> 
>> 
>> 
>> 
>
>