[TheForge] Re: Powder Damascus

[Michael H. Murphy]

Chuck,

I hope you had your tongue in your cheek when you said it's really easy <G>.
I think Steve is probably one of the -- no, he's not one of anything except
one of a kind.  He's unique.  That stuff is on a par with doing a
three-and-a-half-double-twist-layout off a one-meter board.  It might be
possible, but you'd have to be crazy to try -- and even crazier to succeed.

Damn, that stuff looks good.

Murf

> -----Original Message-----
> From: theforge-bounces at mailman.qth.net [mailto:theforge-
> bounces at mailman.qth.net] On Behalf Of Chuck Robinson
> Sent: Saturday, January 15, 2005 12:52 PM
> To: Sponsored by ABANA
> Subject: Re: [TheForge] Re: Powder Damascus
> 
> Hey Andy,
> Your absolutely right, it's really easy.
>  I'll bet you could turn out a blade like steve's in a day or two.
> http://www.steveschwarzer.com/damascus1.htm
> The process your describing is closer to making CPM steel.
> Chuck
> ----- Original Message -----
> From: "Andrew Vida" <osan at netlabs.net>
> To: <mspencer at tallships.ca>; "Sponsored by ABANA"
> <theforge at mailman.qth.net>
> Sent: Saturday, January 15, 2005 11:21 AM
> Subject: Re: [TheForge] Re: Powder Damascus
> 
> 
> >
> >
> > Mike Spencer wrote:
> >
> > > I dunno.  The sintered widgets I've seen appear to be to some degree
> > > porous.  The sintered particles aren't totally fused, just, well,
> > > stuck very firmly together.  In this powder Damascus technique, the
> > > sintered billet gets rolled and forged to completely fuse the granular
> > > sarting material.
> >
> > Nah... the gears in your car's differential are almost certainly
> > sintered, and those don't look very porous, do they?  The main
> > difference between commerical sintering and so-called "powder damascus"
> > is order of operations.  In commercial sintering, super high pressures
> > are applied to powdered metal in a mold.  The pressures are so high that
> > the pressed forms can be finish-machined.  From there they go into the
> > sintering furnace and presto!
> >
> > Powder damascus is sorta opposite... powder into a mold (retort),
> > brought to heat, and then pressure is applied to stick the weld.
> >
> > As for porous, that is for bronze bearings and the sort.  I believe that
> > that is controlled by the amount of pressure applied and the precise
> > configuration of the metal particles used. Voila!  Oilite!
> >
> > -Andy
> >
> > PS: never ream the bore of an oilite bearing.  It closes the pores and
> > the bearing loses all its attractive self lubricating properties.
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