Method of producing a heat insulating separation wall

A method for producing a heat-insulated separation wall between a combustion chamber of a solid fuel rocket and a chamber containing an electronic control installation for controlling said rocket, wherein said separation wall comprises a plate-shaped metallic base body or substrate which comprises:

• first thermally spraying a metal bond layer of thickness of less than 0.2 mm onto said plate-shaped metal base, said bond layer being selected form the group consisting of the following alloys:
• (1) an alloy containing 1-15% Al, 2-10% Mo, 0.0.5%
• C and the balance essentially Ni;
• (2) 2-30% Al, 0-0.5% C, and the balance essentially Ni;
• and (3) 5-5% Cr, 15% Al, 0-0.5% C, 0.05-3% Y, and the balance essentially Ni, Co, and/or Fe;
• and then thermally spraying on said plate-shaped metal base a ceramic composition selected from the group consisting of Al.sub.2 O.sub.3 -base and ZrO.sub.2 -base material such as to produce a thermal barrier having a thickness ranging from 0.5 to 2.5 mm and a density ranging between 80 to 97% of the theore-tical density of the corresponding material in the sintered state,
• said ceramic composition being such that, when based on Al.sub.2 O.sub.3, the composition contains by weight up to 50% TiO.sub.2, or up to 10% SiO.sub., or up to 30% of ZrO.sub.2 or MgO, and the balance essentially Al.sub.2 O.sub.3, and
• said ceramic composition being such that, when based on ZrO.sub.2, the composition contains by weight up to 30% CaO or MgO or Al.sub.2 O, or up to 20% Y.sub.2 O.sub.3, or up to 10% SiO.sub.2, and the balance essentially ZrO.sub.2.