LOL you might be onto something there.
I already have one of these:
I'm in line when you can bring me to the next level:
........
High-vacuum systems were expensive back when I was a lab puppy. A sintering furnace can't be a lot different... but I don't really know. Perhaps some materials can sinter in a neutral atmosphere but I would expect either vacuum or reducing atmosphere would be needed. We used to use welded stainless foil bags to thermally process stuff that was "atmosphere-sensitive" but had to go in a "standard" furnace. That might be a cheap option for small parts.
Mike