Effect of metal particle size and powder volume fraction on the filling performance of powder injection moulded parts with a microtextured surface
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in: Precision Engineering, Jahrgang 72.2021, Nr. November, 11.2021, S. 604-612.
Publikationen: Beitrag in Fachzeitschrift › Artikel › Forschung › (peer-reviewed)
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T1 - Effect of metal particle size and powder volume fraction on the filling performance of powder injection moulded parts with a microtextured surface
AU - Ammosova, Lena
AU - Cano Cano, Santiago
AU - Schuschnigg, Stephan
AU - Kukla, Christian
AU - Mönkkönen, Kari
AU - Suvanto, Mika
AU - Gonzalez-Gutierrez, Joamin
N1 - Publisher Copyright: © 2021 The Author(s)
PY - 2021/11
Y1 - 2021/11
N2 - Metal injection moulding of miniaturized devices demands unique feedstock materials and mould designs with high dimensional accuracy. In this work, the influences of the powder size and powder content of 17–4 PH stainless steel feedstock and the influence of mould design on the successful production of micro-scaled structures were investigated. Ni mould inserts with high dimensional accuracy and texture sizes of 50–200 μm using a new microtexturing technique were manufactured. 17–4 PH stainless steel feedstocks with powder sizes (D 90) of 10 and 22 μm and powder contents of 60 and 65 vol.-% were compounded. The rheological properties of the obtained feedstocks were characterized with a capillary rheometer to assess their flowability. The results showed that 10 μm sized particles caused a slight but not significant increase in the viscosity. The highest viscosity increase occurred when the powder content increased from 60 to 65 vol.-%. Feedstocks with the 10 μm powder particles ensured complete filling within microtextures for all mould variations. However, when using feedstocks with 22 μm particles, the filling capabilities of the 50 and 100 μm microtextures decreased with increasing powder content. The shape retention was better for those micropillars produced with mould inserts with 200 μm cavities than for the micropillars replicated with the inserts having cavities of 50 and 100 μm. The results indicated that the proposed mould insert preparation technique opens new possibilities for mass production using the μMIM process to create micro-scaled components using feedstocks without nanoparticles.
AB - Metal injection moulding of miniaturized devices demands unique feedstock materials and mould designs with high dimensional accuracy. In this work, the influences of the powder size and powder content of 17–4 PH stainless steel feedstock and the influence of mould design on the successful production of micro-scaled structures were investigated. Ni mould inserts with high dimensional accuracy and texture sizes of 50–200 μm using a new microtexturing technique were manufactured. 17–4 PH stainless steel feedstocks with powder sizes (D 90) of 10 and 22 μm and powder contents of 60 and 65 vol.-% were compounded. The rheological properties of the obtained feedstocks were characterized with a capillary rheometer to assess their flowability. The results showed that 10 μm sized particles caused a slight but not significant increase in the viscosity. The highest viscosity increase occurred when the powder content increased from 60 to 65 vol.-%. Feedstocks with the 10 μm powder particles ensured complete filling within microtextures for all mould variations. However, when using feedstocks with 22 μm particles, the filling capabilities of the 50 and 100 μm microtextures decreased with increasing powder content. The shape retention was better for those micropillars produced with mould inserts with 200 μm cavities than for the micropillars replicated with the inserts having cavities of 50 and 100 μm. The results indicated that the proposed mould insert preparation technique opens new possibilities for mass production using the μMIM process to create micro-scaled components using feedstocks without nanoparticles.
KW - metal injection moulding
KW - powder injection moulding
KW - microtextured surfaces
KW - feedstock
KW - 17-4 PH steel
KW - rheology
KW - viscosity
UR - http://www.scopus.com/inward/record.url?scp=85110339610&partnerID=8YFLogxK
U2 - 10.1016/j.precisioneng.2021.06.014
DO - 10.1016/j.precisioneng.2021.06.014
M3 - Article
VL - 72.2021
SP - 604
EP - 612
JO - Precision Engineering
JF - Precision Engineering
SN - 0141-6359
IS - November
ER -