Method for preparing surface in-situ C-SiO2 composite coating of continuous SiC fibers

A composite coating, fiber surface technology, applied in the direction of fiber treatment, fiber type, rayon of inorganic raw materials, etc., can solve the control of the C-SiO composite coating, the conductive and dielectric properties of the coating that has not yet been discussed and other problems, to achieve the effect of good ability to absorb radar waves, moderate bonding strength, and uniform and controllable thickness

CN107740266AActive Publication Date: 2018-02-27XIAMEN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2018-02-27

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Abstract

The invention provides a method for preparing a surface in-situ C-SiO2 composite coating of continuous SiC fibers and relates to continuous SiC fibers. The method comprises the steps: placing SiC fibers in a muffle furnace, carrying out heating in an air atmosphere, and then, carrying out furnace cooling until the temperature is room temperature in the air atmosphere, so as to obtain a degummed SiC fiber sample A; placing the degummed SiC fiber sample A in a porous graphite boat, placing the graphite boat in a heating-up tubular furnace, introducing an inert atmosphere at room temperature, andexhausting air in the tubular furnace; heating the obtained degummed SiC fiber sample A under the protection of an inert atmosphere, then, closing a N2 gas valve, opening a Cl2 gas valve, adjusting chlorine gas flow-rate, carrying out heat preservation, forming the C-SiO2 composite coating on the surface of the SiC fibers in situ through regulating and controlling a process, carrying out heat preservation, then, closing Cl2 gas, and carrying out furnace cooling until the temperature is room temperature under the protection of an inert atmosphere, thereby obtaining the surface in-situ C-SiO2 composite coating of the continuous SiC fibers.
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Description

technical field

[0001] The invention relates to continuous SiC fibers, in particular to a continuous SiC fiber surface in-situ C-SiO that can be used for electromagnetic wave absorption 2 Composite coating preparation method. Background technique

[0002] The development of electronic information technology has increased the demand for civilian anti-radiation technology and military stealth technology, and also put forward an urgent demand for microwave-absorbing materials (D.D.L.Chung. Electromagnetic interference shielding effectiveness of carbon materials[J].Carbon.2001,39:279- 285). Absorbing materials can be divided into coating type and structural type according to the molding process. Coated materials have the disadvantages of heavy weight and easy to fall off, while structural absorbing materials can have the advantages of both absorbing and bearing (Mu Wudi. Preparation and performance research of high temperature resistant absorbing coating [D]. Changsha: Nation...

Examples

Embodiment Construction

[0029] The present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings.

[0030] (1) SiC fiber bundles with an oxygen content of 12 wt %, an average diameter of 13 μm, and 500 SiC fibers per bundle were cut into small pieces with a length of 10 cm. Place it in a muffle furnace under an air atmosphere, raise the temperature to 500°C at a rate of 5°C / min, and keep it warm for 30min. Then it was cooled to room temperature with the furnace in an air atmosphere to obtain a degummed SiC fiber sample A.

[0031] (2) Disperse the degummed SiC fiber sample A in a porous graphite boat of 15cm x 2cm x 2cm and place the graphite boat in the constant temperature zone of the quartz tube furnace, seal it with a rubber tube and a rubber plug to form a closed space, Flow N with a flow rate of 80ml / min at room temperature 2 Air, ventilation time 60min, to ensure that the air in the tube is exhausted.

[0032] (3) The degummed SiC ...