X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao105.cox.net ([68.230.241.41] verified) by logan.com (CommuniGate Pro SMTP 5.2.7) with ESMTP id 3120956 for flyrotary@lancaironline.net; Tue, 09 Sep 2008 09:18:30 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.41; envelope-from=dale.r@cox.net Received: from fed1rmimpo03.cox.net ([70.169.32.75]) by fed1rmmtao105.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20080909131753.XETL774.fed1rmmtao105.cox.net@fed1rmimpo03.cox.net> for ; Tue, 9 Sep 2008 09:17:53 -0400 Received: from [192.168.1.100] ([72.223.44.12]) by fed1rmimpo03.cox.net with bizsmtp id CdHs1a0070Flgvc04dHs7l; Tue, 09 Sep 2008 09:17:52 -0400 Message-ID: <48C6777F.9010703@cox.net> Date: Tue, 09 Sep 2008 06:17:51 -0700 From: Dale Rogers User-Agent: Thunderbird 2.0.0.16 (Windows/20080708) MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: New rotary engine-mazda points on design References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Ernest Christley wrote: >> Aluminized Titanium Nitride >> >> Titanium Nitride is the gold-tone stuff you see on a lot of the >> "better" drill bits, of late. > ...and it is a composite. > http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TX9-3Y9R495-9&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_version=1&_urlVersion=0&_userid=10&md5=35836ae642150db699b54dcb20a66a6d > > That's one application. The ceramic has up to 10% TiAlN content. I was thinking more along the lines of a PVD coating. Often applied with LASER assistance, the coating (plating?) is typically .0001" to .0002" in thickness. (Yes, that's _"tenths"_.) The Al component - or more properly, the AlN component - improves the heat transfer qualities. TiN has an interesting property, in that the molecules are pretty nearly round - they act like little bearings. Dale R.