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A kind of molding method of fiber-reinforced SIC-based composite material

A composite material and fiber-reinforced technology, which is applied in the field of preparation of ceramic matrix composite materials, can solve the problems of imperfect material forming, poor shaping of composite materials, and heavy processing workload, so as to shorten the preparation period, reduce processing allowance, and save energy. The effect of processing costs

Active Publication Date: 2021-07-16
AVIC BASIC TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the PIP process usually uses solid polycarbosilane (PCS) as the precursor. During impregnation, the solid PCS is dissolved in a solvent and used as an impregnating agent. Due to the existence of the solvent, the composite material can only be formed by a hot press, and cannot be used. Closed metal injection mold molding method, which leads to defects such as poor shaping of the composite material; in addition, because the commonly used solid PCS cannot undergo cross-linking and curing reactions when heated, the size of the composite material changes seriously when it is cracked in a high-temperature furnace. As a result, the molding of the material is not perfect, the subsequent processing workload is large, and the processing cost is high

Method used

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  • A kind of molding method of fiber-reinforced SIC-based composite material
  • A kind of molding method of fiber-reinforced SIC-based composite material
  • A kind of molding method of fiber-reinforced SIC-based composite material

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Effect test

Embodiment 1

[0044] In this embodiment, the 1k SiC fiber is used as a raw material, a solventless liquid polycarcilane is a prior to apertured graphite cracking mold as a mold molding mold for fiber pre-enrichment preform, and a metal injection mold is formed as a first cycle molding mold. Finally, a precise SiC fiber reinforced SiC group composite plate (hereinafter referred to as: SiC / SiC tablet), the plate length is 100mm, width 100mm, thick 3mm, including the following steps:

[0045] The 1k SiC fiber was used as a raw material, and the SiC fiber prefabricate was prepared in a two-dimensional woven layer, and the fiber volume fraction was 45%.

[0046] Processing SiC / SiC flat prefabrication prefamped and densified cycle molding with holes of graphite cracking mold, in the graphite cleavage mold, aperture having a hole diameter of 2 mm, a hole pitch is 6 mm, a hole is evenly distributed, and the graphite is high in graphite.

[0047] The SiC fiber prefabricate after the laying is placed...

Embodiment 2

[0062] In this embodiment, the T300C fiber is used as a raw material, and the solvent-free liquid polycaroxane is a prior to aperture, and a molded graphite cleavage mold is used as a fifthal graphite cracking mold as a fiber pre-made graphite molding mold. As the first cycle molded mold, the metal injection mold is finally obtained, the precise molded C fiber reinforced SiC-based composite plate (hereinafter referred to as C / SiC flat), the plate length is 200mm, width of 200 mm, thick 4mm, including the following steps:

[0063] The T300C fiber is a raw material, and the C fiber prefabricate is prepared by two-dimensional woven layers, and the fiber size fraction is 40%.

[0064] Processing C / SiC flat fiber pre-formed graphite mold, processed C / SiC plate to cause crystallization cycle molded graphite cracking mold, in the graphite cracking mold, hole, aperture is 4mm, hole pitch is 8mm, hole pores Distribution, graphite material is high in graphite.

[0065] The laying C fibe...

Embodiment 3

[0080] In this embodiment, the 1k SiC fiber is used as a raw material, a solventless liquid polycarcilane is a prior to apertured graphite cracking mold as a mold molding mold for fiber pre-enrichment preform, and a metal injection mold is formed as a first cycle molding mold. Finally, a precise SiC fiber reinforced SiC matrix composite curved article is 280mm, 120mm wide, and 5mm wide, including the following steps:

[0081] The 1k SiC fiber was used as a raw material, and the SiC fiber prefabricate was prepared by 2.5d weaving, with a fiber volume fraction of 50%.

[0082] Processed SiC / SiC Curved Parts Pre-forming and Determination Periodic Filled Cracking Molds, and in the graphite cracking mold, the hole is 5 mm, the pore distance is 6mm, the holes are evenly distributed, the graphite is high in graphite .

[0083] The layered SiC curved article fiber prefabricate is placed in a hole in graphite cracking mold, and the holes of graphite cracking mold is fixed.

[0084] The S...

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Abstract

The invention belongs to the technical field of preparation of ceramic-based composite materials, and relates to a molding method of fiber-reinforced SiC-based composite materials. The invention adopts the method of combining the metal injection mold molding in the first cycle and the graphite cracking mold molding in the densification cycle, so that the fiber-reinforced SiC-based composite material can be shaped in a near-net size during the entire PIP process. Firstly, fiber preforms are prepared with fibers as raw materials. After preforming the fiber preforms in graphite molds, the fiber preforms are transferred to metal injection molds in a solvent-free liquid state for the first cycle of molding. Finally, the precursor is impregnated and cracked. (PIP), fiber-reinforced SiC-based composites were subjected to densification cycle molding in a perforated graphite pyrolysis mold. The method can realize near-net size molding of the fiber-reinforced SiC-based composite material, and the prepared material has high dimensional accuracy, saves processing costs, shortens the processing period, and promotes the engineering process of the ceramic-based composite material.

Description

Technical field [0001] The present invention belongs to the preparation of ceramic matrix composite materials, and it is directed to a molding method of a fiber reinforced SiC matrix composite. Background technique [0002] The ceramic matrix composite material not only retains the high temperature, low density, high ratio, high-compact mold, anti-oxidation and anti-abrasion, etc. of ceramic materials, but also overcomes a fatal weaknesses such as ceramic material brittleness and reliability. Fracture behavior, the characteristics of crack is not sensitive, no catastrophic damage. Among them, the fiber reinforced SiC matrix composite materials have characteristics such as high temperature, low density, and oxidation, and have become the focus of domestic and foreign research, with broad application prospects in the fields of aviation, aerospace and other fields. At present, the hotspots of domestic and foreign research are the molding techniques of the fiber reinforced SiC-based ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/84C04B35/565
CPCC04B35/571C04B2235/95C04B2235/5244C04B2235/5248
Inventor 张冰玉王岭李宝伟焦春荣梁艳媛刘善华
Owner AVIC BASIC TECH RES INST
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