[T3] Tire failure?

[Dave Hall]

Yes, the programme did explain how the interference in the thin film occurs,
though didn't go into the phase shift etc!

Dave.
UK VW Type 3&4 Club
===============

-----Original Message-----
From: type3-vwtype3.org-bounces at lists.vwtype3.org
[mailto:type3-vwtype3.org-bounces at lists.vwtype3.org] On Behalf Of Jim Adney
Sent: 20 January 2011 15:13
To: type3 at vwtype3.org
Subject: Re: [T3] Tire failure?

On 20 Jan 2011 at 12:57, Dave Hall wrote:

> That does surprise me....
> ... Unless by 'burns equally well in pure O and pure N' means it 
> doesn't burn at all!

;-)

It actually "burns" quite well in both atmospheres, making it one of the
hardest fires to put out. Of course, like Mg and Al, it's hard to get
started with large pieces, but filings and machining chips can go pretty
spectacularly.

> A recent TV programme on the Gugenheim Museum in Spain, explained how 
> they heated the titanium cladding to a certain temperature to get the 
> right colour of oxide on the surface - a sort of golden colour.  Since 
> it apparently keeps its colour, I presume it does not react further to 
> atmosphereic Oxygen or Nitrogen.  Obviously that just means the 
> Titanium oxide layer is non-reactive (as with Aluminium).

I often see jewelry done this way. It makes nice earrings because Titanium
is quite light. Often the people don't actually know which metal they've got
there. (I've heard people call it Tantalum, which is a completely different
animal.) The color is just an intereference pattern determined by the
thickness of the oxide/nitride layer. You can get any color you want by
heating it longer or shorter. Red, blue & gold are commonly seen. The gold
coating we see on modern cutting tools is Titanium nitride. That's probably
not an interference pattern, but the actual color of the material, but I'm
not sure about that.


--
Jim Adney
jadney at vwtype3.org
Madison, WI USA

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