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YelloRolla Forums Junkie Location: On your mum! Registered: May 2002	Re: Copper head gaskets Wed, 19 May 2004 12:56 Annealing the copper eliminates the dislocations so that the copper is once again composed of nice perfect crystals. This allows the copper wire to be reused since it is now soft and easily bent. Generally annealing is done at greater than 1/2 of the melting point on the absolute temperature scale. Copper melts at 1083C = 1356K so the annealing is done at greater than 678K = 405C = 761F. However, it will take a fairly long time at the lower end of the range so it is more common to anneal at about 700 to 800C. The copper can be worked and annealled many, many times for the purposes of bonsai since we really don't need extremely tightly controlled properties. The properties will degrade with repeated cycles for various reasons - oxidation being the most obvious. The copper will maintain it's soft crystal structure after annealing at any realistic cooling rate (from very slow like letting fire die down to fast like throwing it in a bucket of water). Generally, I would suggest water cooling to prevent excessive oxidation of the surface. Steel (iron + carbon) on the other hand will change it's properties dramatically upon rapid cooling . However, it is possible to cool copper fast enough to make it into a brittle material. This normally involves cooling rates of greater than 10 million degrees C per second which can only be obtained by spraying a very thin film on to a very cold surface (this equipment is very expensive). Got this of Google. I checked other sites and the information was generally the same - as this is analmods, I went for the technical sounding, and long winded artical. [Report message to a moderator]

	Subject	Poster	Date
	Copper head gaskets	Syc02T	Tue, 04 May 2004 02:16
	Re: Copper head gaskets	3t-RA40	Tue, 04 May 2004 03:20
	Re: Copper head gaskets	ta22gt	Tue, 04 May 2004 04:09
	Re: Copper head gaskets	barned01	Tue, 04 May 2004 04:38
	Re: Copper head gaskets	MR. 2	Tue, 04 May 2004 06:51
	Re: Copper head gaskets	RWDboy	Tue, 04 May 2004 07:18
	Re: Copper head gaskets	Syc02T	Thu, 06 May 2004 03:12
	Re: Copper head gaskets	RWDboy	Thu, 06 May 2004 03:42
	Re: Copper head gaskets	RWDboy	Thu, 06 May 2004 03:48
	Re: Copper head gaskets	oldcorollas	Wed, 19 May 2004 06:33
	Re: Copper head gaskets	Syc02T	Wed, 19 May 2004 06:42
	Re: Copper head gaskets	Syc02T	Wed, 19 May 2004 02:26
	Re: Copper head gaskets	kingmick	Wed, 19 May 2004 06:14
	Re: Copper head gaskets	celicaboy_2000	Wed, 19 May 2004 07:31
	Re: Copper head gaskets	YelloRolla	Wed, 19 May 2004 07:47
	Re: Copper head gaskets	kingmick	Wed, 19 May 2004 10:32
	Re: Copper head gaskets	Syc02T	Wed, 19 May 2004 12:38
	Re: Copper head gaskets	oldcorollas	Wed, 19 May 2004 14:21
	Re: Copper head gaskets	YelloRolla	Wed, 19 May 2004 12:56
	Re: Copper head gaskets	ed_ma61	Wed, 19 May 2004 12:59
	Re: Copper head gaskets	Syc02T	Wed, 19 May 2004 13:26
	Re: Copper head gaskets	3t-RA40	Fri, 21 May 2004 02:20
	Re: Copper head gaskets	EVOSTi	Sat, 22 May 2004 09:57
	Re: Copper head gaskets	Syc02T	Thu, 27 May 2004 03:58
	Re: Copper head gaskets	dcving	Thu, 27 May 2004 23:34
	Re: Copper head gaskets	Syc02T	Fri, 28 May 2004 04:27
	Re: Copper head gaskets	Syc02T	Sun, 06 June 2004 09:49

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