Dependence of composition of SiC-Al2O3 composite absorbers on microwave heating characteristics

Spark plasma sintering technology was used to prepare SiC-Al2O3 composite absorbers with a range of compositions. Scanning electron microscopy showed that of the components was uniform in all compositions. The influences of composition, heating time, and microwave power of the composite absorbers on their heating characteristics were analyzed. As the microwave power was increased from 500 W to 1000 W, the temperature achieved by the absorber increased. After being heated for 24 min at a microwave power of 1000 W, all samples maintained a constant temperature. The absorber with 40mass% Al2O3 content reached the highest temperature (952 degrees C); the absorber with 95 mass%Al2O3 content achieved the lowest temperature (313 degrees C). These findings have importance as a reference for precise temperature control in microwave heating of composite absorber.

Automated summary

Spark plasma sintering technology was used to prepare SiC-Al2O3 composite absorbers with different compositions, and the effects of composition, heating time, and microwave power on their heating characteristics were analyzed. It was found that increasing the microwave power led to higher temperature achieved by the absorbers, and the absorbers with different Al2O3 content had different heating temperatures. These findings are important for precise temperature control in microwave heating of composite absorbers.