Abstract: Improved heat insulating of a combustion chamber in an internal combustion engine is obtained by providing a heat-resistant body in at least one surface, which is intended to at least partly limit a combustion chamber. A support body supports the heat-resistant body, said bodies each having facing mantle surfaces. Between said bodies there is a heat-insulating element of a material having a lower coefficient of thermal expansion and a lower modulus of elasticity than the material in either one of said bodies. The bodies and the element are held together at the mantle surfaces by means of a shrink fit.

Abstract: In a cylinder head (1) of a piston engine, a thermal insulation component having openings for the accommodation of valve seats, spark plugs, and injection nozzles consists of a circular aluminum titanate plate (2) which is shrink-fitted into a planar circular ring of zirconium oxide (12) gripped or shrink-fitted in the cylinder head. The circular plate (2) of aluminum titanate forms the greatest part of the cylinder head bottom (9).

Abstract: In a cylinder head of a piston engine, the surface of the cylinder head facing the combustion chamber is covered by a plate having openings for valves, spark plugs or injection nozzles. The plate consists of mullite containing 2 to 30% by volume of zirconium oxide and/or hafnium oxide embedded therein, plus 0 to 3 mole-percent of oxides of magnesium, calcium or yttrium, with respect to the zirconium and/or hafnium oxide, and of no more than 0.5%, by weight, of other oxidic impurities.