Binder removal via a two-stage debinding process for ceramic injection molding parts

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Debinding binders in two stages is critical to maintaining the shape of injected parts; the resulting decomposition affects the strength and rigidity of a structure. This study determines the optimal debinding process on the basis of a higher binder removal rate and the production of defect-free parts. The feedstock used was a combination of alumina-zirconia powder with a binder that consists of high-density polyethylene (HDPE), paraffin wax (PW), and stearic acid (SA). During the first stage, the injected parts were immersed in an n-heptane solution at 50 C, 60 C, 65 C, and 70 C to remove PW and SA. Binder weight loss was evaluated as a function of time. In the second stage, HDPE was removed by using thermal debinding. The results show that the optimum solvent debinding process runs for 16 h at 60 C. The weight loss of the binder reaches 41.1% and results in the formation of defect-free parts. The binders are degraded at approximately 550 C during thermal debinding. This degradation resulted in decomposition of nearly 96.9% of the binders. Low heating rates (1 C/min to 2 C/min) prevent defects from forming in the injected parts.

Original languageEnglish
Pages (from-to)2819-2824
Number of pages6
JournalCeramics International
Volume40
Issue number2
DOIs
Publication statusPublished - Mar 2014

Fingerprint

Injection molding
Binders
Paraffin waxes
Stearic acid
Polyethylene
High density polyethylenes
Defects
Decomposition
Aluminum Oxide
Heptane
Heating rate
Rigidity
Zirconia
Powders
Feedstocks
Alumina
Degradation

Keywords

  • A. Injection molding
  • Alumina-zirconia
  • C. Diffusion
  • Debinding

ASJC Scopus subject areas

  • Ceramics and Composites
  • Process Chemistry and Technology
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Binder removal via a two-stage debinding process for ceramic injection molding parts. / Md Ani, Sarizal; Muchtar, Andanastuti; Muhamad, Norhamidi; A Ghani, Jaharah.

In: Ceramics International, Vol. 40, No. 2, 03.2014, p. 2819-2824.

Research output: Contribution to journalArticle

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