Enhanced microwave absorption properties under synergism of 0-D TiB2 particles and 1-D TiB2 fibers prepared by carbothermal process

Titanium boride (TiB 2 ) 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 TiB 2 fibers were investigated. Further, the dielectric and microwave absorption (MA) properties of TiB 2 /paraffin composites within 2–18 GHz were discussed. As a result, the yield of TiB 2 fibers reached a maximum at 1400 °C for 180 min. The content of TiB 2 was directly proportional to permittivity. The sample containing 80 wt % TiB 2 particles and fibers indicated that the minimum reflection loss ( RL min ) 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 TiB 2 become an ideal candidate for microwave absorbing materials applied in high temperatures.