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<p>The pore-forming agent ammonium carbonate is used in the preparation of porous bioceramic coatings containing hydroxyapatite (HA) for bone repair via laser cladding. However, unlike certain essential bone metabolism elements, it cannot be retained in the final coating. To overcome this limitation, ceramic coatings were fabricated by incorporating varying amounts of Mg (0, 2.5, 5, 7.5, and 10 wt.%) into the coating powders prior to laser cladding, resulting in coatings label as A-0, A-2.5, A-5, A-7.5, and A-10&#xa0;Mg, respectively. The influence of Mg content on the microstructure, in vitro bioactivity, electrochemical corrosion and microhardness of A-Mg coating was investigated. The ceramic coatings consisted of the phases HA, β-TCP, TiO<sub>2</sub>, CaTiO<sub>3</sub>, MgO, and demonstrated a metallurgical bonding between the coating and substrate. The coatings showed a partially porous structure and the introduction of Mg does not change the corrosion tendency but accelerates the corrosion rate. The lowest I<sub>corr</sub> value 1.301 × 10<sup>-4</sup> A·cm<sup>-2</sup> for the A-0&#xa0;Mg coating and highest value 3.176 × 10<sup>-4</sup>A·cm<sup>-2</sup> for the A-2.5&#xa0;Mg coating. Moreover, the microhardness varied with the Mg content. The maximum microhardness was 1835.6 HV<sub>0.2</sub> for coating without Mg, while 1360.8 HV<sub>0.2</sub> with Mg. In addition, all ceramic coatings exhibited a bone-like apatite formation ability in a simulated body fluid (SBF). The Mg distribution increased gradually from the deposited bone-like apatite to the dense part of the A-Mg coating as well as in regions around the pores. It can be concluded that the addition of Mg improves both the mechanical properties and in vitro bioactivity of the coating.</p>

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Influence of Mg Addition on Microstructure, Hardness, Bioactivity in Vitro and Electrochemical Corrosion Properties of a Bioceramic Hydroxyapatite Coating Fabricated by Laser Cladding

  • 期刊论文

  • 发表日期：

    2025年8月21日

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  • Huaizhang Gu,
  • Xiaojuan Shang

摘要

The pore-forming agent ammonium carbonate is used in the preparation of porous bioceramic coatings containing hydroxyapatite (HA) for bone repair via laser cladding. However, unlike certain essential bone metabolism elements, it cannot be retained in the final coating. To overcome this limitation, ceramic coatings were fabricated by incorporating varying amounts of Mg (0, 2.5, 5, 7.5, and 10 wt.%) into the coating powders prior to laser cladding, resulting in coatings label as A-0, A-2.5, A-5, A-7.5, and A-10 Mg, respectively. The influence of Mg content on the microstructure, in vitro bioactivity, electrochemical corrosion and microhardness of A-Mg coating was investigated. The ceramic coatings consisted of the phases HA, β-TCP, TiO2, CaTiO3, MgO, and demonstrated a metallurgical bonding between the coating and substrate. The coatings showed a partially porous structure and the introduction of Mg does not change the corrosion tendency but accelerates the corrosion rate. The lowest Icorr value 1.301 × 10-4 A·cm-2 for the A-0 Mg coating and highest value 3.176 × 10-4A·cm-2 for the A-2.5 Mg coating. Moreover, the microhardness varied with the Mg content. The maximum microhardness was 1835.6 HV0.2 for coating without Mg, while 1360.8 HV0.2 with Mg. In addition, all ceramic coatings exhibited a bone-like apatite formation ability in a simulated body fluid (SBF). The Mg distribution increased gradually from the deposited bone-like apatite to the dense part of the A-Mg coating as well as in regions around the pores. It can be concluded that the addition of Mg improves both the mechanical properties and in vitro bioactivity of the coating.