航空发动机用聚酰亚胺树脂基复合材料固化工艺及热稳定性能

doi:10.11868/j.issn.1001-4381.2021.001238

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Abstract

Aiming at the need of aero-engines, investigation was made into the curing process and thermal stability of a polyimide-matrix structural composite. The curing kinetic equation of EC-380A resin was established. The curing degree of the resin was simulated as a function of the curing temperature and time. Further, combined with the resin rheology, the curing process of the EC-380A composite was established and verified. Large-scaled aero-engine typical structural components were fabricated. Thermal stability of the composite was estimated by mass loss, internal quality of the flaw-embedded laminate, and mechanical property after thermal ageing. By multi-temperature step curing at 330-380℃, the flaw-free composite could be manufactured under the circumstance of an integrated layup. The composite has excellent thermal stability with thermal resistance of 370-400℃. The mass loss rate is around 1.3% after ageing for 1000 h at 370℃ and 285℃.No new flaw or propagation of the embedded flaw occurs for the composite after thermal ageing at 400℃, indicating a high-temperature structural stability.

Key words： composite for aero-engine polyimide curing process thermal stability embedded flaw

Received: 28 December 2021 Published: 18 July 2022

ZTFLH:

V258

Corresponding Authors: Hongjiang NI,Xiangbao CHEN E-mail: nihongjiang@iccas.ac.cn;xiangbao.chen@biam.ac.cn

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	Articles by authors
	Hongjiang NI
	Yu XING
	Xiaoxiang DAI
	Jun LI
	Daijun ZHANG
	Xiangbao CHEN

Cite this article:

Hongjiang NI,Yu XING,Xiaoxiang DAI, et al. Curing process and thermal stability of polyimide-matrix composite for aero-engines[J]. Journal of Materials Engineering, 2022, 50(7): 102-109.

URL:

http://jme.biam.ac.cn/EN/10.11868/j.issn.1001-4381.2021.001238 OR http://jme.biam.ac.cn/EN/Y2022/V50/I7/102

DSC curves for PI resin at different heating rates

Initial (T_i), peak (T_p) and final (T_f) temperatures for PI resins

Curing datas for PI resin

; (b)lnβ-1/T_p
">

Linear fitting curves
(a)

; (b)lnβ-1/T_p

Simulated curing degree-temperature-time 3D surface for PI resin

Simulated curing times as functions of curing temperatures at different curing degrees for PI reisn

Time needed for PI resin curing at different temperatures

Rheology curve for PI resin

Immersed ultrasonic inspection photographs for PI composite
(a)2 mm thickness; (b)4 mm thickness

Typical components of PI composite outer duct

Optical micrographs of PI composite cross-sections
(a)0°; (b)45°; (c)-45°; (d)90°

Mass loss curves under thermal ageing for PI composite

Contact ultrasonic testing for PI composite before and after thermal ageing at 400 ℃
(a)flaw-embedded region before thermal ageing; (b)normal region before thermal ageing; (c)normal region after thermal ageing; (d)periphery of flaw-embedded region after thermal ageing

Properties of EC-380A composite before and after thermal ageing at 400 ℃

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