At 02:17 PM 8/28/2016, you wrote:
So I'm confused: peroxide motors for dragsters tend to need refurbishment every decade or so...which suggests the silver is not coming off every run and the samarium oxide coating is working.
Why are folks here consistently reporting a problem?
Bill
On Sunday, August 28, 2016, David Weinshenker <<mailto:daze39@xxxxxxxxxxxxx>daze39@xxxxxxxxxxxxx> wrote:
On 08/28/2016 12:31 PM, Paul Breed wrote:
I don't think this thermal decomposition will work with 85 or 90%, I
think it would have to be 98%.
We've seen the thermal decomposition thing apparently work,
in our misadventures with phosphate-contaminated "90%" peroxide:
with a freshly prepared catalyst, the motor would start and
run apparently well as long as it was at operating temperature,
but once stopped and cooled down it wouldn't start again.
So it seems like once the catalyst surface is quite hot,
there will be decomposition even if it has been chemically
"poisoned".
So I'm thinking: start with a motor stacked with silver-plated
nickel or stainless screens, give it one good long run with
high-concentration peroxide, then examine the screens to see
where the silver survived and where it was hot enough to strip
off... then replace the screens downstream of there with a
more heat-resistant type.
-dave w