Abstract
Finite element simulations have been conducted to investigate the heat distribution between the particles from contact resistance and current density during the Micro-forming Fields Activated Sintering Technology (Micro-FAST). Results of effect for the arrangement modes of powder particles (Series connection and parallel connection) showed that the electro-heat focusing could be attributed to the remarkable difference of contact resistance between the particles.
Highlights
With the development of microminiaturization in manufacturing, the demand of micro-parts is increased
The high heat area is expanded with the increasing contact resistance
The value of contact resistance is equal to the particle resistance in Fig. 7(a), similar to the series connection
Summary
With the development of microminiaturization in manufacturing, the demand of micro-parts is increased. The research on the heat distribution of samples during Micro-FAST is quite meaningful to the research of densification mechanism. Vanmeensel et al [7] studied the evolution of current density and heat distribution during field activated sintering by finite element calculations. Wang et al [9] used a finite element model to simulate threeway coupling of heat, electrical and mechanical behaviour of electric current activated sintering. Wang et al [11] analysed the heat and stress distribution in spark plasma sintering through a heat-electrical-mechanical coupled and dynamic finite element model. All these studies proved that FEM is a reliable method to simulate heat distribution. In this paper, based on the experimental data for the preparation of micro-gears, simplified models about sintering body were built by FEM to simulate the heat distribution and investigate the influences of contact resistance on heat distribution
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