The microwave absorbing ability

compressive strength

volume shrinkage and mass loss rate of hardened calcium aluminate (CA) material at different calcination temperatures (700

800

900

1000

1100

1200

1300

1400 and 1500℃) were studied. The specimens obtained at different calcination temperatures (800

1000

1300 and 1500℃) were characterized using XRF and XRD methods. A simple cup-shaped vessel was prepared by using CA and the microwave shock characteristics of this device were tested. The experimental results showed that the microwave absorbing ability of hardened CA decreased first and then tended to be stable with the increase of calcination temperature. After 1000℃

the microwave absorbing ability was so weak that it is no longer affected by temperature. The compressive strength of this material increased with the rise of calcination temperature

and reached the maximum at around 800℃. Then it gradually decreased and reached the minimum at 1300℃

and then stabilized after a slight increase. In the meantime

the volume shrinkage and mass loss rate increased with the rise of calcination temperature. The test results of microwave shock characteristics showed that the intensity of hardened CA basically did not change under the high-power and long-time microwave irradiation. The microwave-metal discharge test proved that this cementitious material after hardening has excellent mechanical properties and high temperature stability. In summary

hardened CA has good wave-transparent properties

excellent mechanical properties and outstanding high temperature stability

being very suitable for using in microwave heating.