High-performance special heat insulation piece for aero-engine exhaust nozzle

Abstract

The invention discloses a high-performance special heat insulation piece for an aero-engine exhaust nozzle, which comprises a first stainless steel sheet metal layer, a heat insulation layer and a second stainless steel sheet metal layer. The heat insulation layer is positioned between the first stainless steel sheet metal layer and the second stainless steel sheet metal layer, and the heat insulation layer is made of a porous foaming composite material. The porous foaming composite material comprises the following components in percentage by mass: 20%-30% of fire-resistant fibers, 30%-55% of an inorganic silicon prepolymer, 15%-25% of expanded graphite, 10%-15% of a halogen-free flame retardant, 7%-11% of titanium oxide powder and 2-4% of an additive. The porous foaming material adopts an inorganic silicon material as a matrix and titanium oxide powder as a reinforcement, so that a composition of the heat insulation piece has higher physical and chemical stability, the heat insulation piece is effectively prevented from collapsing in the manufacturing or assembling process, and the loss of effectiveness is avoided. Besides, as the stainless steel metal plate layers are arranged on the two sides of the porous foaming material, the structural stability is further improved, and collapse in the assembling process is avoided.

Description

technical field [0001] The invention belongs to the technical field of components of aero-engines, and in particular relates to a high-performance special heat insulation piece for an aero-engine tail nozzle. Background technique [0002] Many parts of an aircraft are affected by high temperature heat damage, and in order to ensure the normal operation of the aircraft, the structure and related systems must be protected from the consequences of fire, structural component performance degradation, and electronic component failure caused by high temperature heat damage. [0003] For these purposes, several materials and solutions have been tested and set up to prevent severe conditions caused by high temperature heat damage. Depending on the application, two main effects need to be addressed: heat radiation and heat transfer. [0004] The most widely used solution in the state of the art is thermal insulation cladding mainly made of ceramic or silicone laminates together with ...

AI Technical Summary

Problems solved by technology

Environmentally friendly porous ceramic fiber materials are too expensive, it is necessary to find a low-cost thermal insulation material

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