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oldcorollas
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Kita-Ku, Sapporo, Japan
Registered:
January 2003

Re: need BROKEN 4AGZE piston for analysis?

Fri, 10 October 2003 02:38

shinybluesteel wrote on Fri, 10 October 2003 11:45

if you cant find a broken one, does that say anything about their strength? i'd be interested in the results from this,
oldcorollas, what do you know of thermal spraying/PVD technology? i wanna look into maybeye PVDing a set of pistons with "the gold one" or something, might be able to reduce detonation and other interesting things.

well, they seem pretty strong (if used correctly) but i'd like to characterise them a bit, see if they are forged, see what the ceramic coating is like etc..

plasma spraying? physical vapour deposition? well, part of my work is helping develop alloys for plasma spraying onto the turbine blades... Smile

HPC do a Thermal Barrier Coating (TBC) for pistons. it's relatively cheap (like $20 a piston) and it looks like a plasma sprayed ceramic.
http://www.hpcoatings.com.au/pages/piston.htm
btw, i have no affiliation with HPC whatsoever, i just like their stuff Wink

i think it was going to be around $500 to get the pistons, valves and combustion chambers coated, as well as the ports and extractors (HiPerCoat on the latter, not the the Extreme one...)

hmm, what's this 'gold' coating of which you speak? Titanium nitride? (like on drill bits). the main problem is to get the coating to stick to the metal in a heat cycling environment. usually the thinner it is, the better it resists temp cycling, but thinner is less effective. with proper surface preparation (like etching to get some mechanical keying) and maybe a bit of diffusion bonding, the coating should work well..

my instinct would be to go with an alumina coating, as it has high thermal resistance, and will form a good bond with the aluminium (since it is a natural oxidation product). might depend on the coating thickness and the mismatch of thermal expansion coefficients.

Cya, Stewart

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