Ok, this is technique, that probably would be condemned by your teachers - detailing is made using so called metal clay technique. It's not very popular among traditional silversmiths and goldsmiths, but it is gaining more and more interest with time.
Well, basically yes, but this "oven" goes very close to melting point of each metal to form a sinter. It's generally so called powder metallurgy. It was originally used rather in metal industry as far as I know.