Sintering driving force of Al2O3 powders at the initial stage of pulse electric current sintering under thermoelastic diffusion

IF 3.4 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY International Journal of Mechanical and Materials Engineering Pub Date : 2018-08-29 DOI:10.1186/s40712-018-0095-9

Zhang Long, Zheng Heng-wei

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引用次数: 4

Abstract

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.

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热弹性扩散下脉冲电流烧结初期Al2O3粉末的烧结驱动力

对脉冲电流烧结下的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，因此颈部生长机构中的驱动力成为关键问题，需要取得进展。考虑非傅立叶效应和非菲克效应，研究了脉冲电流烧结初期非导电Al2O3粉末的热弹性扩散耦合传输的烧结驱动力。局部浓度梯度引起的浓度扩散通量和热扩散通量是表面曲率驱动的附加驱动力。等尺寸颗粒模型表明，在体积扩散和同时存在的表面扩散和体积扩散机制中，这些通量对烧结驱动力的影响占主导地位。特别是在烧结初期后期，烧结驱动力显著增加。

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