Preparation of ZTA composite ceramics derived from sol–gel method by DIW printing

材料科学 复合数 溶胶凝胶 陶瓷 陶瓷复合材料 氧化铝陶瓷 复合材料 纳米技术
作者
Xiaole Yang,Guo Jinyu,Hehan Xie,Yuanbing Li,Xianfeng Yang
出处
期刊:International Journal of Applied Ceramic Technology [Wiley]
标识
DOI:10.1111/ijac.14811
摘要

Abstract In this study, the dense and fine‐grained zirconia toughened alumina (ZTA) composite ceramics were efficiently prepared by 3D gel printing technology. Zirconia powder, zirconium oxychloride, and zirconium sol were introduced into boehmite gel as zirconium sources, and their effects on rheological properties, drying characteristics, microstructure, and mechanical properties of ceramics were discussed. The results showed that all gels exhibit reversible shear thinning properties. The gel with zirconia powder has a relaxation phenomenon; zirconium sol forms another gel network in the boehmite gel network, and two linear viscoelastic regions are observed. The gel with zirconia powder has the highest solid loading, small drying shrinkage, and fewer drying defects. The grain growth of ZTA ceramics with zirconium sol was inhibited, and the zirconia grains were evenly distributed, with the highest bending strength of 518 ± 103 MPa. The new gel preparation method and gel drying process offer great possibilities for manufacturing optical glasses and functional ceramics with high‐performance geometric structures, which cannot be achieved by traditional manufacturing methods.
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