Powder distribution on powder injection moulding of ceramic green compacts using thermogravimetric analysis and differential scanning calorimetry

Leslie Poh, Christian Della, Shengjie Ying, Cindy Goh, Yun Li

Research output: Contribution to journalArticle

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Abstract

Powder-binder separation during injection moulding causes defects such as cracking, warpage or anisotropic shrinkage during firing. In this paper, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) have been previously used to analyse powder distribution within the green body for metal injection moulding are used for ceramics. TGA and DSC are used to characterize the mass loss and heat of fusion of the binder system, silicon nitride feedstock and test-bars. TGA can measure the volume fraction of powder in green parts directly with 1.76 vol% difference from nominal volume fraction and variations up to 0.177 vol%. The DSC empirical model predicted volume fraction of powder in green parts with 1.76 vol% difference from nominal volume fraction and variations up to 1.710 vol%. Using rule of mixture, it over predicted volume fraction of powder in green parts by 6.78 vol% from nominal volume fraction and with variations up to 2.510 vol%.

LanguageEnglish
Pages256-263
Number of pages8
JournalPowder Technology
Volume328
Early online date2 Jan 2018
DOIs
StatePublished - 1 Apr 2018

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Injection molding
Powders
Thermogravimetric analysis
Differential scanning calorimetry
Volume fraction
Binders
Metal molding
Silicon nitride
Feedstocks
Fusion reactions
Defects

Keywords

  • differential scanning calorimetry (DSC)
  • powder injection moulding (PIM)
  • segregation
  • silicon nitride
  • thermogravimetric analysis (TGA)

Cite this

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title = "Powder distribution on powder injection moulding of ceramic green compacts using thermogravimetric analysis and differential scanning calorimetry",
abstract = "Powder-binder separation during injection moulding causes defects such as cracking, warpage or anisotropic shrinkage during firing. In this paper, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) have been previously used to analyse powder distribution within the green body for metal injection moulding are used for ceramics. TGA and DSC are used to characterize the mass loss and heat of fusion of the binder system, silicon nitride feedstock and test-bars. TGA can measure the volume fraction of powder in green parts directly with 1.76 vol{\%} difference from nominal volume fraction and variations up to 0.177 vol{\%}. The DSC empirical model predicted volume fraction of powder in green parts with 1.76 vol{\%} difference from nominal volume fraction and variations up to 1.710 vol{\%}. Using rule of mixture, it over predicted volume fraction of powder in green parts by 6.78 vol{\%} from nominal volume fraction and with variations up to 2.510 vol{\%}.",
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Powder distribution on powder injection moulding of ceramic green compacts using thermogravimetric analysis and differential scanning calorimetry. / Poh, Leslie; Della, Christian; Ying, Shengjie; Goh, Cindy; Li, Yun.

In: Powder Technology, Vol. 328, 01.04.2018, p. 256-263.

Research output: Contribution to journalArticle

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AU - Poh,Leslie

AU - Della,Christian

AU - Ying,Shengjie

AU - Goh,Cindy

AU - Li,Yun

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