NBD dual zone high pressure and high vacuum split tube furnaces can be chosen from two kinds of alloy tube, e.g. Stainless steel 310S refractory alloy or Ni based super alloy, which offer a solution of heating treatment under high positive pressure or high vacuum pressure with/without inert gas support to process special compound material. The furnace can be heated up to max. 900°C or 1100°C with optional vessel. The operating positive pressure is from 105 to 800 psi according to different heating temperature.