Fabrication and properties of a stable and porous YSZ/nano-HA structure by binder jetting processes

• Published in: Materials and manufacturing processes Vol. 38; no. 8; pp. 989 - 998
• Main Authors: Huang, Shuangjun, Ye, Chunsheng, Wu, Chengxing
• Format: Journal Article
• Language: English
• Published: Taylor & Francis 11.06.2023
• Subjects: binder jetting; ceramics; density; morphology; porosity; sintering; strength
• ISSN: 1042-6914; 1532-2475
• DOI: 10.1080/10426914.2022.2072874

In the preparation of porous ceramic structure by binder jetting process, the stability and strength of porous ceramic structure caused by different powder composition have attracted much attention. Therefore, a pore filling method was proposed in this paper, in which nano-hydroxyapatite (nano-HA) particles with different contents were filled into yttrium-stabilized zirconia (YSZ) ceramic powders to solve the poor porosity and weak mechanical properties of porous ceramic structure. The effects of nano-HA content on the pore formation, surface quality, phase stability, compressive strength and microstructure of porous YSZ/nano-HA structure were studied. The results showed that as the mass percentage of nano-HA increased to 25 wt.%, the surface roughness of the top, side, and bottom decreased, whereas the relative density increased from 39.3% to 48.8%. After sintering at 1450°C the porous YSZ/nano-HA structures revealed a decrease in shrinkage (18.1% −11.5%) and water absorption (4.4% −2.3%), but an increase in compressive strength (30.9 MPa − 41.2 MPa). The sintered phase of YSZ/nano-HA structure presented a new microstructure evolution process, in which t-ZrO 2 and Ca 3 (PO 4 ) 2 acted as the main crystal phase, with trace amounts of Ca 0.15 Zr 0.85 O 1.85 cubic solid solution.