I UNDERSTAND THE RISKS IN DOING THIS.
The amount of Cd is upto 12%, a very small amount, I've a few of these contacts and intend to do them in small batches.
The max temperature reached will be 500 degrees Celsius.
Here is a side view of my heating chamber (made from Iron), it is oval.
You can see how I've got several sealing lips. The grey dots are Alumium sealing rings which have been fitted into a groove (also visible) in the lip. My air gap will be ~0.5mm which I hope will close up once the chamber is heated.
Do I have too many lips, is it overkill? Do I need the Al seals?
The other graphic is the top exit for the gaseous Cd, with a Heat resistant glass tube (taken from a milking machine).
This tube will be surrounded by a water cooling system, to solidify the Cd.
Do you have any issues with this design?
I realise this is not rocketry, however it is very similar to propellent chamber seals.