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Method for performing silicon melt infiltration of ceramic matrix composites

A technology of composite materials and ceramic matrix, which is applied in the field of preparation of ceramic matrix composite materials, and can solve problems such as accelerated corrosion

Inactive Publication Date: 2011-08-17
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Boron is known to cause accelerated corrosion of Si and SiC in preforms due to high pressure water vapor from combustion products

Method used

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  • Method for performing silicon melt infiltration of ceramic matrix composites
  • Method for performing silicon melt infiltration of ceramic matrix composites

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Experimental program
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Embodiment Construction

[0015] figure 1 is a schematic diagram of the traditional prepreg process used in the preparation of ceramic matrix composites. After the tow 10 is passed around the drum, the tow passes through a container 14 where a ceramic fiber coating is applied to the toe by a well known chemical vapor deposition (CVD) process. The coating is used to protect the fibers during composite processing and to provide a low strength fiber-matrix interface, allowing the fiber-matrix debonding and fiber pull-out "toughening" mechanism. CMC has traditionally used carbon as the fiber coating, but also incorporates boron nitride or silicon-doped boron nitride for improved oxidation resistance. After fiber coating, the fiber tow 10 is drawn from a container 16 filled with a slurry containing the preform matrix components (SiC and carbon particles, binder and solvent) and then wound around a drum 18 to form a unidirectional prepreg tape 20 . The tape is then dried, removed from the drum, cut to sha...

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Abstract

A method of melt infiltrating a fiber-reinforced ceramic matrix composite preform includes (a) dipping the preform into a bath of molten Silicon; (b) leaving the preform in the bath for a predetermined time; (c) withdrawing the preform from the bath; and (d) cooling the preform.

Description

technical field [0001] The present invention relates to a method for the preparation of ceramic matrix composites, and more particularly to a method of melt infiltrating fibers with molten silicon to reinforce ceramic matrix composites (CMC). Background technique [0002] Various process schemes for the preparation of MICMC have been developed. One known process is the "prepreg process" and the other is the "sluny cast" process. [0003] In the "pre-dipping" process, the first step is to apply a fiber coating by chemical vapor deposition (CVD). Fiber coatings are used to protect fibers during composite processing, providing a low strength fiber-matrix interface, thereby debonding the fiber-matrix and pulling the fibers out of the "pull-out toughing" mechanism. CMCs have typically used carbon as the fiber coating in the past, but have also incorporated boron nitride or silicon-doped boron nitride for improved oxidation resistance. [0004] After fiber coating, fiber bundle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/85
CPCC04B2235/616C04B2235/614C04B35/806C04B2235/6567C04B35/62884C04B2235/3826C04B35/62868C04B2235/422C04B35/573C04B2235/5268C04B35/80
Inventor P·E·格雷
Owner GENERAL ELECTRIC CO