On the effect of feedstock preparation on the characteristics of warm formed powder compacts

M. M. Rahman, M. A.S. Wardi, S. S.M. Nor

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Powder compaction technology has advanced significantly over the past decades and is considered as an alternative lower-cost process to machining, casting, stamping, forging and other similar metal-working technologies. Feedstock preparation is considered a vital step in producing parts through the powder route because any inhomogeneity within the powder mass would cause inhomogeneous density distribution inside the green compacts, which in turn would cause fracture in the final products after sintering in the controlled environment. This paper presents the outcomes of an experimental investigation on the effects of feedstock preparation on the mechanical properties and microstructures of final products formed at above ambient temperature. A lab-scale uni-axial die compaction rig was designed and fabricated which enabled powder forming at elevated temperatures. Iron powder ASC 100.29 was mechanically mixed with different quantities of zinc stearate for 10, 30, and 60 minutes, respectively. Green compacts were generated by forming the prepared feedstock at 180°C through simultaneous upward and downward axial loading. The defect-free green compacts were subsequently sintered in an argon gas fired furnace and characterized for their physical and mechanical properties, and their microstructures were evaluated. The results revealed that the characteristics of the final products were affected by the feedstock preparation. The most suitable lubricant content and mixing time are found to be 0.4 wt% and 60 minutes, respectively. From this study, the proper zinc stearate content and mixing time were identified for the production of high quality products through the warm forming route. This study could be extended by using different types of base powder as well as lubricant.

Original languageEnglish
Pages (from-to)1132-1139
Number of pages8
JournalInternational Journal of Automotive and Mechanical Engineering
Volume8
Issue number1
DOIs
Publication statusPublished - 2013

Fingerprint

Feedstocks
Powders
Lubricants
Compaction
Zinc
Metal working
Mechanical properties
Iron powder
Microstructure
Stamping
Forging
Argon
Machining
Casting
Furnaces
Sintering
Physical properties
Temperature
Defects
Gases

All Science Journal Classification (ASJC) codes

  • Automotive Engineering
  • Mechanical Engineering

Cite this

@article{e867758446184e77bdd0f9784f4b1e4d,
title = "On the effect of feedstock preparation on the characteristics of warm formed powder compacts",
abstract = "Powder compaction technology has advanced significantly over the past decades and is considered as an alternative lower-cost process to machining, casting, stamping, forging and other similar metal-working technologies. Feedstock preparation is considered a vital step in producing parts through the powder route because any inhomogeneity within the powder mass would cause inhomogeneous density distribution inside the green compacts, which in turn would cause fracture in the final products after sintering in the controlled environment. This paper presents the outcomes of an experimental investigation on the effects of feedstock preparation on the mechanical properties and microstructures of final products formed at above ambient temperature. A lab-scale uni-axial die compaction rig was designed and fabricated which enabled powder forming at elevated temperatures. Iron powder ASC 100.29 was mechanically mixed with different quantities of zinc stearate for 10, 30, and 60 minutes, respectively. Green compacts were generated by forming the prepared feedstock at 180°C through simultaneous upward and downward axial loading. The defect-free green compacts were subsequently sintered in an argon gas fired furnace and characterized for their physical and mechanical properties, and their microstructures were evaluated. The results revealed that the characteristics of the final products were affected by the feedstock preparation. The most suitable lubricant content and mixing time are found to be 0.4 wt{\%} and 60 minutes, respectively. From this study, the proper zinc stearate content and mixing time were identified for the production of high quality products through the warm forming route. This study could be extended by using different types of base powder as well as lubricant.",
author = "Rahman, {M. M.} and Wardi, {M. A.S.} and Nor, {S. S.M.}",
year = "2013",
doi = "10.15282/ijame.8.2013.4.0092",
language = "English",
volume = "8",
pages = "1132--1139",
journal = "International Journal of Automotive and Mechanical Engineering",
issn = "2229-8649",
publisher = "The Automotive Engineering Centre (AEC), Universiti Malaysia Pahang",
number = "1",

}

On the effect of feedstock preparation on the characteristics of warm formed powder compacts. / Rahman, M. M.; Wardi, M. A.S.; Nor, S. S.M.

In: International Journal of Automotive and Mechanical Engineering, Vol. 8, No. 1, 2013, p. 1132-1139.

Research output: Contribution to journalArticle

TY - JOUR

T1 - On the effect of feedstock preparation on the characteristics of warm formed powder compacts

AU - Rahman, M. M.

AU - Wardi, M. A.S.

AU - Nor, S. S.M.

PY - 2013

Y1 - 2013

N2 - Powder compaction technology has advanced significantly over the past decades and is considered as an alternative lower-cost process to machining, casting, stamping, forging and other similar metal-working technologies. Feedstock preparation is considered a vital step in producing parts through the powder route because any inhomogeneity within the powder mass would cause inhomogeneous density distribution inside the green compacts, which in turn would cause fracture in the final products after sintering in the controlled environment. This paper presents the outcomes of an experimental investigation on the effects of feedstock preparation on the mechanical properties and microstructures of final products formed at above ambient temperature. A lab-scale uni-axial die compaction rig was designed and fabricated which enabled powder forming at elevated temperatures. Iron powder ASC 100.29 was mechanically mixed with different quantities of zinc stearate for 10, 30, and 60 minutes, respectively. Green compacts were generated by forming the prepared feedstock at 180°C through simultaneous upward and downward axial loading. The defect-free green compacts were subsequently sintered in an argon gas fired furnace and characterized for their physical and mechanical properties, and their microstructures were evaluated. The results revealed that the characteristics of the final products were affected by the feedstock preparation. The most suitable lubricant content and mixing time are found to be 0.4 wt% and 60 minutes, respectively. From this study, the proper zinc stearate content and mixing time were identified for the production of high quality products through the warm forming route. This study could be extended by using different types of base powder as well as lubricant.

AB - Powder compaction technology has advanced significantly over the past decades and is considered as an alternative lower-cost process to machining, casting, stamping, forging and other similar metal-working technologies. Feedstock preparation is considered a vital step in producing parts through the powder route because any inhomogeneity within the powder mass would cause inhomogeneous density distribution inside the green compacts, which in turn would cause fracture in the final products after sintering in the controlled environment. This paper presents the outcomes of an experimental investigation on the effects of feedstock preparation on the mechanical properties and microstructures of final products formed at above ambient temperature. A lab-scale uni-axial die compaction rig was designed and fabricated which enabled powder forming at elevated temperatures. Iron powder ASC 100.29 was mechanically mixed with different quantities of zinc stearate for 10, 30, and 60 minutes, respectively. Green compacts were generated by forming the prepared feedstock at 180°C through simultaneous upward and downward axial loading. The defect-free green compacts were subsequently sintered in an argon gas fired furnace and characterized for their physical and mechanical properties, and their microstructures were evaluated. The results revealed that the characteristics of the final products were affected by the feedstock preparation. The most suitable lubricant content and mixing time are found to be 0.4 wt% and 60 minutes, respectively. From this study, the proper zinc stearate content and mixing time were identified for the production of high quality products through the warm forming route. This study could be extended by using different types of base powder as well as lubricant.

UR - http://www.scopus.com/inward/record.url?scp=84897071624&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84897071624&partnerID=8YFLogxK

U2 - 10.15282/ijame.8.2013.4.0092

DO - 10.15282/ijame.8.2013.4.0092

M3 - Article

AN - SCOPUS:84897071624

VL - 8

SP - 1132

EP - 1139

JO - International Journal of Automotive and Mechanical Engineering

JF - International Journal of Automotive and Mechanical Engineering

SN - 2229-8649

IS - 1

ER -