Abstract: A flat section with density not less than 25% from theoretical value is sintered from the powder of low ductile reactive alloy, welded by diffusion welding with cover foils made from ductile reactive metal that seal hermetically inner and surface pores, and assembled with two heat resistant sheets in the laminated package. Cover foils are made from metal that belongs to the same metal system as said sintered powder. The package is encapsulated in a capsule made from reactive alloy that belongs also to the same metal system as said sintered powder. An anti-adhesive release agent such as Y.sub.2 O.sub.3, A1.sub.2 O.sub.3, or CaF.sub.2 is deposited on both sides of the laminated package and between cover foils and heat resistant sheets. A portion of metal powder such as Mn, Ti, Nb, Cr, or other metals, having a high affinity to oxygen, inserts into said capsule for absorbtion of oxygen during the heating and forming. After outgassing vacuum heating at 1100-1500.degree. F.