LAUSR

High-performance electromagnetic interference (EMI) shielding materials for high-temperature harsh environment are highly required for electronics and aerospace applications. Here, a composite made of ultra-high temperature ceramic and polymer derived SiOC ceramic (PDC-SiOC) with high EMI shielding was reported for such applications. A total EMI shielding efficiency (SET) of 26.67 dB with a thickness of 0.6 mm at Ka-band (26.5-40 GHz) was reported for ZrB2 fabricated by spark plasma sintering, which showed reflection dominant shielding. A unique interface of t-ZrO2 was formed after the introduction of PDC-SiOC into ZrB2. This interface has better electrical conductivity than SiOC. The composites also displayed reflection dominant shielding. Accordingly, the composite with a normalized ZrB2 fraction of 50 % pyrolyzed at 1000 °C exhibited significantly SET of 72 dB (over 99.99999 % shielded) with a thickness of 3 mm at the entire Ka-band. A maximum SET of 90.8 dB (over 99.9999999 % shielded) was achieved with a thickness of 3 mm at around 39.7 GHz.