Composite matrix thermocouple based on silicon carbide fibers and method of making same

Abstract

The application provides a composite matrix thermocouple based on silicon carbide fibers, which comprises, from inside to outside: an inner electrode: SiC fibers, a metal matrix; an insulation layer: Al2O3-Y2O3 ceramic; an outer electrode: SiC fibers, a metal matrix; a transition layer: SiC fibers, Al2O3; a protective layer: Al2O3-Y2O3 coating. The application also provides a preparation method of the composite matrix thermocouple based on silicon carbide fibers. The method comprises the following steps: using a chemical vapor infiltration (CVI) process to infiltrate metal alloy into SiC fibers to form an inner electrode; placing the inner electrode in a mold, filling Al2O3-Y2O3 powder, and then vibrating and compacting, and then sintering to form an insulation layer; weaving SiC fibers outside the insulation layer, and then using the CVI process to infiltrate metal alloy into the SiC fibers to form an outer electrode; weaving SiC fibers outside the outer electrode, and then using the CVI process to infiltrate Al2O3 into the SiC fibers to form a transition layer; using the CVI process to deposit Al2O3-Y2O3 on the surface of the transition layer to form a protective layer, and obtaining the composite matrix thermocouple based on silicon carbide fibers.

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