An investigation on characteristics and rheological behaviour of titanium injection moulding feedstocks with thermoplastic-based binders

SUBAŞI M., Safarian A., KARATAŞ Ç.

POWDER METALLURGY, cilt.62, sa.4, ss.229-239, 2019 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 62 Sayı: 4
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1080/00325899.2019.1635305
  • Dergi Adı: POWDER METALLURGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.229-239
  • Anahtar Kelimeler: Rheological behaviour, PEG 20000, powder injection moulding, feedstock, Ti-6Al-4V, Ti-6Al-7Nb, MECHANICAL-PROPERTIES, MELT RHEOLOGY, POWDER, POLYETHYLENE, PARAMETERS, VISCOSITY, MIM
  • Gazi Üniversitesi Adresli: Evet

Özet

The binders used in this work were of two types: binder I, comprising high-density polyethylene, paraffin wax and stearic acid as well as binder II, composing high-density polyethylene, polypropylene, polyethylene glycol 20000, paraffin wax and stearic acid. Therefore, based on these two types of binders, four combinations of feedstocks were categorized as follows: Ti-6Al4V+binder I (A), Ti-6Al-4V+binder II (B), Ti-6Al7Nb+binder I (C) and Ti-6Al-7Nb+binder II (D). The rheological behaviors of feedstocks were investigated at temperatures of 130, 140, 150, 160 and 170 degrees C with different powder loadings varying from 57 to 71% volumetric. At low temperatures (130 degrees C), all feedstocks were observed to have a dilatant flow, while based on the results obtained from experiments, the suitable injection temperatures for these feedstocks were determined to be 140, 150 and 160 degrees C. The critical powder loadings were found to be 65, 67, 67 and 71 vol.%, for feedstocks A,B,C and D, respectively.