Method of producing an expanded insulating layer for propellant charges

摘要

An insulating layer is effected between a propellant charge in the interior walls of a combustion chamber of a rocket engine by applying an expandable plastic to the inside of the combustion chamber housing between the housing and the outer circumferential wall of the propellant charge then expanding the plastic. Advantageously the combustion chamber is preheated before introducing the charge and the expandable plastic into the combustion chamber. Preferably the ratio of the layer of the thickness of the expandable plastic to the spacing between the propellant charge and the walls of the combustion chamber ranges from 1 to 11/2; 1 to 1 and 1 to 3. The expandable plastic is advantageously a polybutadiene.