Ceramic Fiber Coating by Gas-Phase and Liquid-Phase Processes

In recent years several investigators have focused on the synthesis of uniformly and continuously coated particles to impart improved chemical stability, mechanical strength, morphology and/or dispersibility to powders required for preparing nextgeneration composities. This paper reviews two in situ reaction methods employed at Clarkson University to selectively coat individual particles having widely different shape, size and chemical composition. The aerosol procedure allows core particles to become coated using room temperature liquid-gas reactions. Alternatively, coating particles dispersed in a solvent containing reactive precursors is more applicable to industrial processing. Uniform, well-adhering coatings of polyurea on titania powder, of polydivinylbenzene on silica beads, and of carbon and boron nitride on silicon carbide whiskers were made by selecting the correct precursors and reaction chemistries. Qualitative assessment of adhesion between the coatings and cores is given.

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Effects of coating treatment on mechanical properties of carbon fibres and reinforced silicon carbide composites

C.-J.¹,

L.-S.²

2001

Materials Science and Technology

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Three-dimensionally braided carbon fibre reinforced SiC matrix composites have been fabricated and the effects of coating treatment on the mechanical properties have been investigated. It has been found that pyrocarbon coating can improve the strength of the heat treated carbon fibres. When the coating thickness was y0 . 5 mm, the composites had better mechanical properties: a flexural strength of 643 MPa and a fracture toughness of 17 . 9 MPa m 1/2 . The composites also exhibited a toughening fracture mode.MST/4837

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Ceramic Fiber Coating by Gas-Phase and Liquid-Phase Processes

Cited by 6 publications

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Chemical Vapour Infiltration (Cvi) of Silicon Carbide Fibre Preforms

Chemical Vapour Infiltration (Cvi) of Silicon Carbide Fibre Preforms

Aerosol and Solution Modification of Particle-Polymer Interfaces

Effects of coating treatment on mechanical properties of carbon fibres and reinforced silicon carbide composites

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