Abstract: Traditional sintering of B₄C-based ceramics typically requires high temperatures (≥ 2000 °C), long isothermal durations (15-30 min), and high pressures (20-30 MPa), and hence, energy consumption is significant. Here, we propose an ultrafast pressure sintering technique involving direct Joule heating of graphite felt for the low-temperature (1550 °C) and rapid (≤ 2 min) densification of B₄C-based ceramics. The effects of temperature, pressure, and sintering aid (TiSi₂) content on the relative density of B₄C were investigated. The high densification achieved is attributed to an in situ reaction and pressure-guided particle rearrangement induced by the formation of a transient TiSi₂-Si eutectic liquid phase. In particular, TiB₂ and SiC formed by the addition of TiSi₂ significantly increased the fracture toughness of B₄C. This study provides a novel, efficient, and energy-saving method for the rapid and scalable preparation of bulk ceramics.