The densification of a fine-grained tungsten carbide cermet containing 36 wt.% copper binder during impact assisted sintering in a vacuum at thermodynamic temperatures of 1023, 1123, and 1223 K with an initial impact velocity of 6.4 m/s was studied. Based on the experimental data and calculated elastic properties of the samples and the impact machine, computational modeling of the densification dynamics with a trial and error method was carried out using a third-order dynamic system in combination with the rheological model of Maxwell’s viscoelastic body, and as a result previously unknown values of shear viscosity for material cermet matrices were obtained. The time dependences of force, compression, velocity, and acceleration of the system, as well as shrinkage, root-mean-square stress, and strain rate, of the cermet samples during impact assisted sintering were determined. The calculated phase trajectory of the dynamic system movement showed that the initial kinetic energy of the impact was not completely exhausted for the irreversible densification of the cermet samples. Part of the energy dissipated in the environment after the rebound of the machine’s impact parts. At the initial stage, the system exhibited nonperiodic (atemporal) damping during its movement at high ratios between the system’s stiffness and the cermet samples’ viscous resistance. As the ratio decreased, the movement transformed into damping oscillations. The work of densification and the thermomechanical effect, which significantly increased the temperature of porous samples, were evaluated. The estimated activation energy of the viscous flow for the porous cermet matrix was 0.34 eV or 33 kJ/mol that indicated the dislocation mechanism of sintering. The samples produced by impact assisted sintering showed significantly higher strength values compared to pressureless sintered samples at a higher temperature.

研究了含 36 wt.% 铜粘结剂的细晶碳化钨金属陶瓷在真空中、热力学温度为 1023、1123 和 1223 K、初始冲​​击速度为 6.4 m/s 的冲击辅助烧结过程中的致密化。基于样品和冲击机的实验数据和计算弹性特性，采用三阶动力系统并结合麦克斯韦粘弹性体流变模型，采用试错法对致密化动力学进行了计算建模，结果获得了材料金属陶瓷基体的先前未知的剪切粘度值。系统的力、压缩、速度和加速度以及收缩、均方根应力和应变率的时间依赖性，测定了冲击辅助烧结过程中金属陶瓷样品的变化。计算的动态系统运动相轨迹表明，对于金属陶瓷样品的不可逆致密化，冲击的初始动能并未完全耗尽。机器冲击部件反弹后，部分能量消散在环境中。在初始阶段，系统在其运动过程中表现出非周期性（非时间）阻尼，系统的刚度与金属陶瓷样品的粘性阻力之间的比率很高。随着比率减小，运动转变为阻尼振荡。评估了显着提高多孔样品温度的致密化功和热机械效应。多孔金属陶瓷基体粘性流的估计活化能为 0.34 eV 或 33 kJ/mol，表明了烧结的位错机制。与较高温度下的无压烧结样品相比，通过冲击辅助烧结生产的样品显示出明显更高的强度值。