Effects of Interface Coating and Nitride Enhancing Additive on Properites of Hi-Nicalon SiC Fiber Reinforced Reaction-bonded Silicon Nitride Composites PDF Download

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Effects of Interface Coating and Nitride Enhancing Additive on Properites of Hi-Nicalon SiC Fiber Reinforced Reaction-bonded Silicon Nitride Composites

Effects of Interface Coating and Nitride Enhancing Additive on Properites of Hi-Nicalon SiC Fiber Reinforced Reaction-bonded Silicon Nitride Composites PDF Author: Ramakrishna T. Bhatt
Publisher:
ISBN:
Category : Additives
Languages : en
Pages : 24

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Book Description
Strong and tough Hi-Nicalon SiC fiber reinforced reaction-bonded silicon nitride matirix composites (SiC/RBSN) have been fabricated by the fiber lay-up approach. Commercially available uncoated and PBN, PBN/Si-rich PBN, and BN/SiC coated SiC Hi-Nicalon fiber tows were used as reinforcement. The composites contained ~24 vol % of aligned 14 ♯m diameter SiC fibers in a porous RBSN matrix. Both one- and two-dimensional composites were characterized. The effects of interface coating composition, and the nitridation enhancing additive, NiO, on the room temperature physical, tensile, and interfacial shear strenght properties of SiC/RBSN matrix composites were evaluated. Results indicate that all three coated fibers, the thickness of the coating decreased from the outer periphery to the interior of the tows, and that from 10 to 30 percent of the fibers were not covered with the interface coating.