The theoretical investigation of the rapid sintering mechanism under pulse electric current sintering has no unified understanding. Especially for non-conductive powder, since there is no current flowing directly through the powder materials, the driving force in the neck growth mechanism becomes a key problem and needs to make progress. The sintering driving force of nonconductive Al2O3 powders at the initial stage of pulse electric current sintering is investigated under the thermoelastic diffusion coupling transmission with the consideration of non-Fourier and non-Fick effect. The concentration diffusion flux, which is caused by the local concentration gradient, and the thermal diffusion flux act as additional driving forces for the surface curvature driving. Equal-sized particles model reveals that these fluxes exert the dominant influence on sintering driving force for volume and simultaneous surface and volume diffusion mechanisms. In particular, the sintering driving force is remarkably increased at the postperiod of the initial stage of sintering.

中文翻译：

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热弹性扩散作用下脉冲电流烧结初期Al ₂ O ₃粉末的烧结驱动力

对脉冲电流烧结下快速烧结机理的理论研究尚无统一的认识。特别是对于非导电粉末，由于没有电流直接流过粉末材料，因此颈部生长机制中的驱动力成为关键问题，需要不断发展。在考虑非傅立叶效应和非菲克效应的情况下，研究了热弹性扩散耦合传输条件下非导电Al2O3粉体在脉冲电流烧结初期的烧结驱动力。由局部浓度梯度引起的浓度扩散通量和热扩散通量充当表面曲率驱动的附加驱动力。均等大小的颗粒模型表明，这些通量对烧结驱动力起着主导作用，从而影响体积以及同时发生的表面和体积扩散机制。特别地，在烧结的初始阶段的后期，烧结驱动力显着增加。