An Integrated Composite Nozzle Based on Gradient Material

Abstract

The invention discloses an integrated composite spray pipe based on gradient materials. The materials and components of the spray pipe change from the outer wall to the inner wall of the spray pipe ina gradient mode, and the spray pipe comprises a supporting layer, a thermal insulating layer and an ablation resistant layer which are distributed and connected from the outer wall to the inner wallof the spray pipe in sequence. Functions of a ceramic matrix composite of the ablation resistant layer, a low-thermal-conductivity thermal insulating material of the thermal insulating layer and a metal matrix composite of the supporting layer are organically integrated, assembling weak interfaces between the materials of all the layers are eliminated, the mutual coupling effects between the materials of all the layers are enhanced, the design weight of the spray pipe is brought into play to the maximum extent, accordingly, a light weight is achieved, and meanwhile, the structural reliabilityof the spray pipe is also greatly improved after assembling macroscopic interfaces between all the layers are eliminated.

Description

technical field [0001] The invention relates to the technical field of solid rocket motor manufacturing, in particular to an integrated composite nozzle based on gradient materials. Background technique [0002] The pursuit of high quality ratio, high specific impulse and high reliability is an inevitable trend in the development of aerospace power technology. The nozzle is a key component of a solid rocket motor. The ablation rate of the throat lining is a key factor affecting the specific impulse of the engine. The lower the ablation rate, the higher the specific impulse of the engine. Where required, the lighter the nozzle, the higher the engine mass ratio. The traditional nozzle is divided into two parts: ablative insulation structure and support structure according to the functional components. The main task of the ablative thermal insulation structure is to form the inner profile of the nozzle. During the operation of the engine, it can withstand the heating and erosi...

AI Technical Summary

Problems solved by technology

The traditional nozzle is divided into two parts according to the functional composition, the ablation insulation structure and the support structure. The main task of the ablation insulation structure is to form the inner surface of the nozzle. During the operation of the engine, it can withstand the heating and erosion of the wall surface of the nozzle by high temperature gas function to ensure the safety and reliability of the thermal protection of the engine during operation; the supporting structure is the ablation heat insulation structure supporting the nozzle, and bears various strength loads during the operation of the engine. Different functional structures use different raw materials and processes, relying on bonding and assembled to form the overall structure of the nozzle, the manufacturing process is complicated, and there are inevitably interface gaps at the assembly interface between different functional structures. Hidden danger

Images