The effect of nano-sized stainless steel powder addition on mechanical and physical properties of micropowder injection molded part

Javad Rajabi, Norhamidi Muhamad, Abu Bakar Sulong, Abdolali Fayyaz, Muhammad Rafi Raza

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Micropowder injection molding (μPIM) is a new technology that has potential in the mass production of microcomponents. A bulk material of nanoparticles possesses completely different properties from those of large-sized particles. The main objective of this study is to study the effects of nano-sized powder addition on the μPIM process of powder-polymer mixtures for the fabrication of miniature parts. The binder systems consist of polyethylene glycol (PEG), polymethyl methacrylate (PMMA), and stearic acid (SA) with different powder loading blended with powders. The results indicate that increasing the nanopowder content to 30wt.% increased the powder loading and decreased the injection and sintering temperatures. The sintered parts had densities of 96% of the theoretical value. High physical and mechanical properties of the sintered specimen were achieved with the 30wt.% nano-sized powder sintered at 1200°C at a heating rate of 5°C/min under vacuum atmosphere. A significant reduction of the surface roughness of the sintered parts using the nano-microhybrid powder (Sa=0.365μm) was observed compared with the sintered parts with only micropowder (Sa=1.002μm). Using nanopowders, the hardness also increased from 182HV to 221HV with a linear shrinkage of approximately 9%, which is less than that of the micropowders (18%).

Original languageEnglish
Pages (from-to)223-232
Number of pages10
JournalMaterials and Design
Volume63
DOIs
Publication statusPublished - 2014

Fingerprint

Stainless Steel
Powders
Stainless steel
Physical properties
Mechanical properties
Stearic acid
Polymethyl Methacrylate
Heating rate
Polymethyl methacrylates
Injection molding
Polyethylene glycols
Binders
Polymers
Sintering
Surface roughness
Hardness
Vacuum
Nanoparticles
Fabrication

Keywords

  • Mechanical properties
  • Micropowder injection molding
  • Nano-sized powder
  • Physical properties
  • Surface roughness

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)

Cite this

The effect of nano-sized stainless steel powder addition on mechanical and physical properties of micropowder injection molded part. / Rajabi, Javad; Muhamad, Norhamidi; Sulong, Abu Bakar; Fayyaz, Abdolali; Raza, Muhammad Rafi.

In: Materials and Design, Vol. 63, 2014, p. 223-232.

Research output: Contribution to journalArticle

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