Preparation and characterization of multilayered ZrO2 coatings on silicon carbide fibers for SiC/SiC composites
Source abstract
Abstract
We have studied the surface morphology, phase composition, and oxidation resistance of multilayered tetragonal zirconia coatings produced on silicon carbide fibers by a sol-gel process and measured the tensile strength of individual fibers as a function of the number of layers in the coating. SiC-fiber-reinforced silicon carbide minicomposites have been prepared through pyrolysis of an organosilicon polymer, and their fracture surfaces have been examined. Using microindentation, we have determined the critical fiber-matrix debonding stress. The results demonstrate that the ZrO 2 coating on the fibers has the form of uniform, weakly bonded layers. The presence of a multilayered ZrO 2 interphase alters the fracture behavior of the SiC/SiC composites. The fiber debond stress in the composites markedly decreases with an increase in the number of layers in the interphase.
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Research context
OpenAlex topics: Advanced ceramic materials synthesis · Concrete and Cement Materials Research · Aluminum Alloys Composites Properties
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References (12)
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