Porosity and microstructure iron-based graded materials sintered by spark plasma sintering and the conventional method

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Abstract

Using PNC-60 powder with the addition of graphite, cylindrical products characterized by different compositions of core and outer layers were made. Some compacts were sintered via the conventional process, while others were subjected to the spark plasma sintering method (SPS) at different times and temperatures. The gradient microstructure was obtained in the transition zone by mixing powders during die filling, followed by pressing and diffusion during sintering. The effect of sintering parameters on the nature of the gradient zone and the morphology of the pores was shown. After conventional sintering, the gradient zone was wider than it was after SPS. Via SPS, the short sintering time confined the diffusion to a local range, making its influence on the gradient structure negligible. Differences in the microstructure were confirmed by functional description.

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Zarębski, K., Putyra, P., & Mierzwiński, D. (2019). Porosity and microstructure iron-based graded materials sintered by spark plasma sintering and the conventional method. Metals, 9(2). https://doi.org/10.3390/met9020264

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