The complex structure of Ti/HA (HA: hydroxyapatite) implants prepared by additive manufacturing technology plays an essential role in its application in bone repair. Digital light processing (DLP) is widely used to prepare bioceramics with complex structures. However, it is a challenge to prepare Ti/HA biomaterials by DLP due to the high ultraviolet (UV) absorption of Ti powder. In the present work, TiH 2 powder coated with a TiO 2 layer is selected to reduce the UV absorption and improve the curing depth for DLP printed green bodies of TiO 2 @TiH 2 /HA, because the TiO 2 @TiH 2 powder can be reduced by 12.7% compared to the TiH 2 powder without any oxidation. Then, the shell layer of TiO 2 undergoes dehydrogenation and reduction reaction with the core phase of TiH 2 during the sintering process to transfer TiO 2 @TiH 2 /HA into Ti x O y @Ti/HA. In addition, the effects of HA content on compressive strength and biocompatibility are investigated in the Ti x O y @Ti/HA biomaterials. The results show that when adding 60 vol%HA, the maximum monolayer curing depth of the slurry reaches 90.1 ± 3.5 µm. 40%Ti x O y @Ti/60%HA shows the maximum effect in promoting the pre‐osteoblast differentiation and a relatively high compressive strength of 48.7 ± 3.5 MPa. This work provides an experimental basis for the preparation of ceramic–metal composites with high UV absorptivity using DLP.
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Li et al. (2024) studied this question.
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