Additive manufacturing process for producing ceramic articles using a sol containing nano-sized particles

US10759707B2 · kind B2 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• Helmar B. Mayr · Kaufering, DE
• Malte Korten · Moorenweis, DE
• Christine M. Andres · Washington, US
• Brant U. Kolb · Afton, US
• Holger Hauptmann · Sindelsdorf, DE
• Gallus Schechner · Herrsching am Ammersee, DE
• Michael Jahns · Gilching, DE
• Kathleen M. Humpa · Stillwater, US
• Melissa A. Lackey · Sunderland, US

Key dates

• Filing date: May 18, 2016
• Grant date: Sep 1, 2020
• Expiry date: Jan 20, 2037

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2235/9653
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for producing a ceramic article, the process comprising the steps of providing a printing sol, the printing sol comprising solvent, nano-sized particles, radiation curable monomer(s) and photoinitiator, the printing sol having a viscosity of less than 500 mPa*s at 23° C., processing the printing sol as construction material in an additive manufacturing process to obtain a 3-dim article being in a gel state, the 3-dim article having a Volume A, transferring the 3-dim article being in a gel state to a 3-dim article being in an aerogel state, heat treating the 3-dim article to obtain a sintered 3-dim ceramic article, the ceramic article having a Volume F, Volume A of the 3-dim article in a gel state being more than 500% of Volume F of the ceramic article in its sintered state. The invention also relates to a ceramic article obtainable according to such a process. The ceramic article can have the shape of a dental or orthodontic article.