Effect of doping different Si source on Ca-P bioceramic coating fabricated by laser cladding. (June 2020)

• Record Type: Journal Article
• Authors: Fu, Qi; Liu, Qibin; Li, Long; Li, Xingmao; Gu, Huaizhang; Sheng, Bo
• Is Part Of: Journal of applied biomaterials & functional materials. Volume 18:(2020)
• Publication Date: 2020-06
• Subjects: Laser cladding -- Ca-P coating -- diatomaceous earth -- bone-like apatite -- bioactivity; Biomedical materials -- Periodicals; Bioengineering -- Periodicals; Biomechanics -- Periodicals; 610.28
• DOI: 10.1177/2280800020917322
• Languages: English
• ISSNs: 2280-8000

Abstract

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 La2 O3 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.