The densification kinetics of boron carbide (B₄C) during multi-stage spark plasma sintering was studied. The densification mechanisms were analyzed according to the stress exponent n and the apparent activation energy Q_d using a creep deformation model. The results showed that the densification mechanisms were controlled by viscous flow and grain boundary diffusion at the low effective stress with initial temperature range of 1600–2000 °C, while the dominant mechanism is the dislocation climb at the effective stress regime with final temperature of 2100 °C and the multi-stage sintering can reduce the apparent activation energy. Meanwhile, the scheme of multi-stage sintering can obtain nearly theoretical dense B₄C and avoid grain growth. Therefore, the basic mechanical properties suggesting a good combination of high hardness (37.63GPa) and bending strength (539.86 MPa) was obtained by the multi-stage sintering.

研究了多阶段火花等离子体烧结过程中碳化硼（B ₄ C）的致密化动力学。利用蠕变变形模型根据应力指数n和表观活化能Q _d分析了致密化机理。结果表明，在低有效应力条件下（初始温度为1600-2000°C），致密化机制受粘性流和晶界扩散的控制，而主要机制是在有效应力条件下（最终温度为2100）的位错爬升。 °C和多阶段烧结可以降低表观活化能。同时，多阶段烧结方案可以得到接近理论密度的B _4。C，避免谷物生长。因此，通过多阶段烧结获得了基本机械性能，表明高硬度（37.63GPa）和抗弯强度（539.86 MPa）的良好组合。