Toymods Car Club Inc: Tech & Conversions => Broken 4AGZE piston analysis-part 2 (4 pics, so might be slow)

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oldcorollas
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Kita-Ku, Sapporo, Japan
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January 2003

Re: Broken 4AGZE piston analysis-part 2 (4 pics, so might be slow)	Thu, 13 November 2003 02:21

Heya, sorry, the coating is the black layer. there is a bit of other crud on the surface which is lighter, and there is a second light phase which seems to be growing thru the ceramic layer in places as well... btw, all of the surfaces you see in the images are tilted at about 45 degrees to vertical, so to measure the size of something, meaure it, multiply by 1.41 (square root of 2) then compare to the micron bar on the bottom right corner. Gabe is right, the third pic is the crown of the piston and the 4th is the edge of the crown. the micron bar at the bottom of the 3rd and 4th pics os 200 microns = 0.2mm. yup, not a bad digicam for 1/2 to 3/4 million these are pretty compressed jpeg, so loses a fair bit of quality.... Ben, i cannot confirm that it is ceramic as yet, but i have a good feeling that it is. in the FIB, ceramics tend to have lower levels of electron emission when they are struck by the gallium ions. this is basically because the ceramic is made up of lighter elements like: alumina = aluminium and oxygen silica = silicon and oxygen... etc also, i have recently been doing some consulting work on electronic chip modifications, where i was cutting thru both alumina and silica layers to get to tracks, and the response of those materials to the ion beam was very similar to the dark layer on the piston. i will be testing the layer, when i cut up the new piston, with an X-ray diffraction machine, which has been optimised for layer characterisation. the results will tell me the size of the interatomic spacing of the layers in the crystal structure, and from that i can deduce what composition the layer is, since most materials have a unique combination of structure and spacing... Cya, Stewart [Report message to a moderator]

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