材料科学
微观结构
多孔性
复合材料
热重分析
烧结
断裂韧性
光致聚合物
收缩率
陶瓷
水银孔隙仪
立体光刻
聚合
多孔介质
聚合物
有机化学
化学
作者
Thomas Rieger,Tim Schubert,Julian Schurr,A. Kopp,Michael Schwenkel,Dirk Sellmer,A.K. Wolff,Juliane A. Meese-Marktscheffel,Timo Bernthaler,Gerhard Schneider
出处
期刊:Materials
[MDPI AG]
日期:2021-12-11
卷期号:14 (24): 7631-7631
被引量:1
摘要
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.
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