Keywords

vapor polishing, surface roughness, hermeticity, mechanical properties, bi-exponential diffusion decay, FDM, additive manufacturing

Abstract

Purpose — Additive manufacturing (AM) is readily capable of producing models and prototypes of complex geometry and is advancing in creating functional parts. However, AM processes typically underperform traditional manufacturing methods in mechanical properties, surface roughness, and hermeticity. Solvent vapor treatments (vapor polishing) are commonly used to improve surface quality in thermoplastic parts, but the results are poorly characterized.

Design/methodology/approach — This work quantifies the surface roughness change and also evaluates the effect on hermeticity and mechanical property impacts for “as-printed” and acetone vapor-polished ABS tensile specimens of 1, 2, and 4 mm thicknesses produced by material extrusion (FDM).

Findings Vapor polishing proves to decrease the power spectral density for surface roughness features larger than 20 μm by a factor of 10X, and shows significant improvement in hermeticity based on both perfluorocarbon gross leak and pressure leak tests. However, there is minimal impact on mechanical properties with the thin specimens showing some increase in elongation at break but decreased elastic modulus. A bi-exponential diffusion decay model for solvent evaporation suggest a thickness independent and thickness dependent time constant with the latter supporting a plasticizing effect on mechanical properties.

Originality/value — The contributions of this work show vapor polishing can have a substantial impact on the performance for end-use application of ABS FDM components.

Original Publication Citation

Clayton Neff, Matthew Trapuzzano, and N. B. Crane, “Impact of Vapor Polishing on Surface Quality and Mechanical Properties of Extruded ABS”, Rapid Prototyping Journal, v 24 No 2, 2018.

Document Type

Peer-Reviewed Article

Publication Date

2018

Publisher

Rapid Prototyping Journal

Language

English

College

Ira A. Fulton College of Engineering and Technology

Department

Mechanical Engineering

University Standing at Time of Publication

Full Professor

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