The doping of silicon (Si) has been proved to improve the bioactivity of Ca-P ceramics. In light of this thinking, in the present study, Ca-P coatings with La2O3 by addition of 10 wt% SiO2 and 10 wt% diatomaceous earth (DE) were fabricated by laser cladding on Ti6Al4V, respectively. Coating doped without Si was also fabricated as the comparison group for the experiment. The effect of two different Si sources on the surface morphology, microstructure, microhardness, and bioactivity was systematically studied. The experimental results show that the Si-doped coating is of rough surface morphology, and the addition of DE significantly reduces the number of cracks and improves the microhardness. The X-ray diffraction results reveal that the amount of bioactive phase tricalcium-phosphate (TCP) and hydroxyapatite (HA) reaches maximum in the DE-doped coating. After soaking in simulated body fluid (SBF), the precipitate of bone-like apatite in the DE-doped coating is significantly higher than that of the other coatings.

中文翻译：

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掺杂不同Si源对激光熔覆制备钙磷生物陶瓷涂层的影响

硅 (Si) 的掺杂已被证明可以提高 Ca-P 陶瓷的生物活性。鉴于这种想法，在本研究中，分别通过激光熔覆在 Ti6Al4V 上制造了添加 10 wt% SiO2 和 10 wt% 硅藻土 (DE) 的具有 La2O3 的 Ca-P 涂层。还制作了不含 Si 的涂层作为实验的对照组。系统地研究了两种不同的硅源对表面形貌、微观结构、显微硬度和生物活性的影响。实验结果表明，Si掺杂涂层表面形貌粗糙，DE的加入显着减少了裂纹数量，提高了显微硬度。X 射线衍射结果表明，生物活性相磷酸三钙 (TCP) 和羟基磷灰石 (HA) 的量在 DE 掺杂涂层中达到最大值。在模拟体液（SBF）中浸泡后，DE掺杂涂层中类骨磷灰石的沉淀明显高于其他涂层。