LAUSR

Titanium boride (TiB2) particles and fibers were synthesized by the carbothermal method with different calcination temperatures and time. Subsequently, the effects of calcination temperatures and time on microstructure and the yield of TiB2 fibers were investigated. Further, the dielectric and microwave absorption (MA) properties of TiB2/paraffin composites within 2–18 GHz were discussed. As a result, the yield of TiB2 fibers reached a maximum at 1400 °C for 180 min. The content of TiB2 was directly proportional to permittivity. The sample containing 80 wt % TiB2 particles and fibers indicated that the minimum reflection loss (RLmin) attained − 46.5 dB at 11.6 GHz when the thickness was 1.45 mm and the effective absorption bandwidth (EAB) was 4.64 GHz (RL<–10 dB) with the thickness of 1.25 mm. The related MA mechanisms were also discussed. The excellent stability, simple production procedure, thin absorbing layer, and wide EAB make TiB2 become an ideal candidate for microwave absorbing materials applied in high temperatures.