Bioactive glass coatings by suspension plasma spraying from glycolether-based solvent feedstock

SURFACE & COATINGS TECHNOLOGY

卷:318

Article; Proceedings Paper

Canas, E.¹  Vicent, M.¹  Orts, M. J.¹  Sanchez, E.¹ 

[1] Univ Jaume 1, ITC, Asociac Invest Ind Ceram AICE, Castellon de La Plana 12006, Spain

关键词: Bioactive glass suspensions characterisation;    Ability of heating factor;    Suspension plasma spraying;    Bioactive glass coatings;   

DOI  :  10.1016/j.surfcoat.2016.12.060

来源: Elsevier

【 摘 要 】

Bioactive glasses are emerging as a substitute of hydroxyapatite in the development of bioactive coatings for biomedical applications. The deposition of these coatings is carried out by a wide range of methods, being atmospheric plasma spraying the-most employed technique. However, the research on the deposition of these coatings from suspension feedstocks by thermal spraying is still incipient, therefore more research about this topic is needed. Thus, a bioactive glass suspension, composed of fine glass particles, was prepared and stabilised through rheological and sedimentation tests to be used as a feedstock in plasma spraying. The solvent used in the suspension preparation was dipropylene glycol methyl ether in order to develop a new type of bioactive suspension. Consequently, as a new type of solvent was used, its effect on the plasma torch properties was determined. On other hand, the rheological behaviour of the suspension feedstock was assessed by means of a simple viscosity model. This suspension was deposited onto metallic substrates by plasma spraying, employing several spraying distances. All coatings displayed a suitable adherence and similar thickness. However, the microstructure of the obtained coatings is highly affected by the spraying distance as it can be seen in coatings surface and cross-section field emission gun environmental scanning electron microscopy examination. Thus, a relation between the spraying distance and coatings microstructure was found. On the other hand, X-ray diffraction confirmed the amorphous nature of the obtained coatings. (C) 2016 Elsevier B.V. All rights reserved.

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