NTU researchers develop high-precision ceramic 3D printing solution

Researchers at National Taiwan University (NTU) appear to have overcome a longstanding obstacle in precision ceramic manufacturing, developing a process that produces ceramic parts with extremely low shrinkage and near full density.

Ultrahigh-solid-loading suspensions (83 vol%) with superior flowability were formulated by the team, in a bid to find a method for use in high-precision applications.

High-temperature processing leads to excessive sintering shrinkage and insufficient density in ceramics, resulting in a loss of dimensional accuracy due to the removal of large amounts of polymer binder. Deformation and defects in the final product have blighted the process to date.

Improving the printability of ultrahigh-solid-loading suspensions holds the key to a solution, and the NTU team is working on an outcome that could offer a potential fix.

“This strategy represents a major milestone in ceramic 3D printing,” stated co-corresponding author of the study Dr. Ying-Chih Liao, Professor of chemical engineering at NTU. “For the first time, precision and complexity can be achieved together by integrating material design, printing, and heat treatment into a unified strategy.”

The research team achieved shrinkage of less than 6.5% and nearly 100% relative density with the highly concentrated suspension, a benchmark for dimensional accuracy in 3D-printed ceramics.

By tuning flow behavior through the rational selection of resin components and control of particle attributes, VPP-compatible viscosity and shear response were preserved while delivering record-high solids fractions. Only minimal additives were required to achieve crisp feature definition and high dimensional fidelity, despite the extreme loading, all resulting in a reliable 3D printing outcome.

The study claims that the development “paves the way for next-generation, high-precision engineering applications”.