A Perspective on Green Body Fabrication and Design for Sustainable Manufacturing

Gupta, Surojit

doi:10.1016/b978-0-12-411497-5.00019-9

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2021

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“…This means that interparticle connections are what gives strength to the pieces, regardless of the individual strength of the particles 14,15 , strength being the capacity of the body to withstand a load. Based on geometric considerations, Onoda estimated the volume of binder between two spherical particles to be 12 :…”

Section: Theoretical Frameworkmentioning

confidence: 99%

Model Approach for Binder Selection in Binder Jetting

Yanez-Sanchez

Lennox

Therriault

et al. 2021

Ind. Eng. Chem. Res.

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Three binders, polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP) and polyacrylic acid (PAA) are studied to elucidate the principal fundamental features giving rise to an excellent binder in a polymer-stainless steel particle array, used in the context of binder jetting. Using an out-of-printer screening approach, samples were compared based on compression tests, specifically the 0.2 % yield strength as a function of void volume fill factor, 𝜙, leading to a quasi-sigmoidal generalized curve for green body strength development. PVA demonstrated a strong tendency to form inter-particle bridges at low 𝜙 and the highest rise in strength, while PAA samples exhibited a lower tendency to form inter-particle bridges and a weak exponential rise in strength. This paper relates these behaviors to polymer strength, capillary properties and polymer-metal interactions and ultimately provides a rigorous selection process for binder efficacy.

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Section: Theoretical Frameworkmentioning

confidence: 99%