SiC based composite material component and on-line jointing preparation method thereof

Abstract

The invention discloses a SiC matrix composite material element and the online connection and preparation method. The element is connected into a whole by the connecting piece through the connection layer at the connector lug, which is characterized in that the component of the connection layer is pure SiC material and the SiC material uses the mix solution of PCS and divinylbenzene as the adhesive, and uses SiC fine power as the packing medium, and can be achieved though preceramic polymer pyrolysis; SiC matrix composite material element with stronger connection strength can be gained throughthe auxiliary connection and the reinforcement of the fastener of SiC matrix composite material. The SiC matrix composite material element and the online connection and the preparation method has theadvantages of simple and practical preparation method, low cost, good thermostable performance and mechanics compatibility, good structural integrity. The connecting preparation method is especiallysuitable for the connection formation and preparation of large-scale complex components.

Description

technical field [0001] The invention relates to a SiC-based composite material component, and also relates to a connection preparation method for the SiC-based composite material component. Background technique [0002] At present, SiC-based composite materials have good high-temperature mechanical properties. For example, C / SiC composite materials can still maintain high strength and high fracture toughness in an inert environment exceeding 1600 ° C. At the same time, SiC-based composite materials also have thermal expansion coefficients. These excellent properties make it widely used as a high-temperature thermal structural material in aviation, aerospace and energy fields. However, the disadvantages of SiC-based composite materials are also obvious: firstly, it is difficult to form, difficult to process, and high in cost; secondly, the complex high-temperature resistant structural parts made by traditional mechanical connection methods cannot obtain high-temperature conne...

AI Technical Summary

Problems solved by technology

For the connection of SiC-based composite materials, silicone resin bonding adhesives are mostly used at present. The cracked connection layer components (Si-O-C ceramics) have poor high temperature resistance and can only be used under conditions below 1100 °C.

The precursor polycarbosilane (PCS) of SiC is used as the adhesive mainly for the connection of hot-pressed SiC-based ceramics, and there are also a few reports for the connection of SiC / SiC composite materials, but generally the active filler Si is added to the PCS. To reduce the volume shrinkage of PCS during the pyrolysis process, and the presence of Si will greatly reduce the high-temperature performance of the connection joint; in addition, if a single-component PCS is used as the adhesive, the melting loss of PCS will occur during the high-temperature cracking process, resulting in reduced binding properties of the connecting joints

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