Abstract
The NiTi shape memory alloy was covered with chitosan/silver layer. Coatings were deposited at room temperature using combination of processing parameters such as deposition voltage and amount of silver in colloidal suspension. Structure of layers was studied by means of X-ray diffraction. Quality of the coatings was evaluated basing on observations done in scanning electron microscopy. Transformation behaviour of coated samples was studied with use of differential scanning calorimeter. The covered sample revealed presence of the reversible martensitic transformation and ability to deformation (in bending mode) up to 8%. Forward martensitic transformation, in as-received NiTi alloy and in alloy after layer deposition occurred in two steps B2-R-B19’. After deformation quality of the chitosan/silver layer remained unchanged.
Highlights
In recent years, effect of the progress done in the field of materials science is widely used in many areas of life
Colloidal suspension of deposited substrates was prepare from 1% (v/v) aqueous citric acid solution, in which 1g/dm3 of chitosan powder had been dissolved at room temperature
The as received NiTi alloy was used as a substrate for CH/Ag layer deposition
Summary
Effect of the progress done in the field of materials science is widely used in many areas of life. The NiTi shape memory alloy is one of the most attractive materials for implants as well as a parts of medical devices [1]. This alloy possesses unique property such as shape memory phenomena, which is closely correlated to the reversible thermoelastic martensitic transformation [2]. It reveals good corrosion resistance and biotolerance compared to other alloys applied in medicine. Due to their bioavailability, they are used to produce staples for the treatment of bone fractures, stents, orthodontic arches, clamps for anastomosis, etc. The toxic substances may undergo unwanted reactions with the surrounding tissues and give rise to allergy [6-7]
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