Vat Photopolymerization of Cemented Carbide Specimen

Author:

Rieger ThomasORCID,Schubert Tim,Schurr Julian,Kopp Andreas,Schwenkel Michael,Sellmer Dirk,Wolff Alexander,Meese-Marktscheffel Juliane,Bernthaler Timo,Schneider Gerhard

Abstract

Numerous studies show that vat photopolymerization enables near-net-shape printing of ceramics and plastics with complex geometries. In this study, vat photopolymerization was investigated for cemented carbide specimens. Custom-developed photosensitive WC-12 Co (wt%) slurries were used for printing green bodies. The samples were examined for defects using quantitative microstructure analysis. A thermogravimetric analysis was performed to develop a debinding program for the green bodies. After sintering, the microstructure and surface roughness were evaluated. As mechanical parameters, Vickers hardness and Palmqvist fracture toughness were considered. A linear shrinkage of 26–27% was determined. The remaining porosity fraction was 9.0%. No free graphite formation, and almost no η-phase formation occurred. WC grain growth was observed. 76% of the WC grains measured were in the suitable size range for metal cutting tool applications. A hardness of 1157 HV10 and a Palmqvist fracture toughness of 12 MPam was achieved. The achieved microstructure exhibits a high porosity fraction and local cracks. As a result, vat photopolymerization can become an alternative forming method for cemented carbide components if the amount of residual porosity and defects can be reduced.

Funder

Federal Ministry of Education and Research

Ministerium für Wissenschaft, Forschung und Kunst Baden-Württemberg

Publisher

MDPI AG

Subject

General Materials Science

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