Effects of size reduction on deformation, microstructure, and surface roughness of micro components for micro metal injection molding

Lin Liu; Xin-da Wang; Xiang Li; Xiao-tong Qi; Xuan-hui Qu

doi:10.1007/s12613-017-1491-5

Volume 24 Issue 9

Sep. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(9): 1021-1026

Lin Liu, Xin-da Wang, Xiang Li, Xiao-tong Qi, and Xuan-hui Qu, Effects of size reduction on deformation, microstructure, and surface roughness of micro components for micro metal injection molding, Int. J. Miner. Metall. Mater., 24(2017), No. 9, pp. 1021-1026. https://doi.org/10.1007/s12613-017-1491-5

Cite this article as:

Lin Liu, Xin-da Wang, Xiang Li, Xiao-tong Qi, and Xuan-hui Qu, Effects of size reduction on deformation, microstructure, and surface roughness of micro components for micro metal injection molding, Int. J. Miner. Metall. Mater., 24(2017), No. 9, pp. 1021-1026. https://doi.org/10.1007/s12613-017-1491-5

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Research Article

Effects of size reduction on deformation, microstructure, and surface roughness of micro components for micro metal injection molding

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Corresponding author:
Lin Liu E-mail: liulin@cumtb.edu.cn
Received: 23 February 2017; Revised: 5 June 2017; Accepted: 6 June 2017

Abstract

Abstract

The fabrication of 17-4PH micro spool mandrils by micro metal injection molding was described here. The effects of size reduction on deformation, microstructure and surface roughness were studied by comparing a φ500 μm micro post and a φ1.7 mm cylinder after debinding and sintering. Experimental results show that slumping of the micro posts occurred due to a dramatic increase in outlet vapor pressure initiated at the thermal degradation onset temperature and the moment of gravity. Asymmetrical stress distribution within the micro component formed during the cooling stage may cause warping. Prior solvent debinding and adjustment in a thermal debinding scheme were useful for preventing the deformation of the micro components. Smaller grain size and higher micro hardness due to impeded grain growth were observed for the micro posts compared with the φ1.7 mm cylinder. Surface roughness increased with distance from the gate of the micro spool mandril due to melt front advancement during mold filling and the ensuing pressure distribution. At each position, surface roughness was dictated by injection molding and increased slightly after sintering.
- powder metallurgy;
- deformation;
- microstructure;
- surface roughness;
- sintering

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References

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