A solid triangular prism irregular precast body and its ply-lay and compaction method

By using split metal tooling and V-shaped layup and segmented compaction of SiC fiber prepreg tape, the problem of pore accumulation in the sharp corner area of ​​the triangular prism preform was solved, enabling the batch production of high-density preforms and meeting the high-quality requirements of high-temperature load-bearing components.

CN121798749BActive Publication Date: 2026-05-26SHANG HAI RUI HUA SHENG XIN CAI LIAO YOU XIAN GONG SI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANG HAI RUI HUA SHENG XIN CAI LIAO YOU XIAN GONG SI
Filing Date
2026-03-06
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing technologies cannot effectively solve the problem of pore accumulation in the sharp corner areas of solid triangular prism precast bodies, resulting in high overall porosity, which cannot meet the requirements for high-temperature load-bearing components in extreme environments such as hypersonic aircraft.

Method used

A V-shaped path layup using split metal tooling combined with continuous unidirectional SiC fiber prepreg tape, combined with directional filling of fiber bundles in the sharp corner area and segmented compaction process, is adopted to achieve high density of the preform through overall mechanical compaction and oven curing.

Benefits of technology

The overall porosity of the preform was ≤1%, which improved the molding quality and structural consistency, reduced the ceramicization defect rate, reduced equipment investment costs, improved production efficiency, and met the preparation requirements of high-temperature load-bearing components.

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Abstract

This invention relates to a solid triangular prism preform and its layup and compaction method. The method includes: fabricating a split-type metal fixture adapted to the shape of the preform; selecting continuous unidirectional SiC fiber prepreg tape and cutting the prepreg tape according to the preform dimensions; continuously laying 90° and 0° prepreg tapes sequentially along the circumference of the prism in a V-shaped path; inserting multiple 0° continuous fiber bundles along the thickness direction in the sharp corner areas of the triangular prism, manually compacting the fiber bundles after each cumulative filling of 0.1-0.3 mm thickness; mechanically compacting the preform as a whole using the fixture; then placing the fixture and the preform together in an oven for curing; and finally, cooling and demolding after curing. This invention achieves a synergistic effect from three dimensions: layup method, sharp corner reinforcement, and compaction process, effectively solving the core technical problems of insufficient fiber density and easy pore aggregation in the sharp corner areas when preparing solid triangular prism preforms using traditional processes.
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