Mehanička i tribološka svojstva prevlake PACVD TiN na biomedicinskoj leguri ASTM F 1537

undergraduate thesis

• Title (english): Mechanical and tribological properties of PACVD TiN coating on ASTM F 1537 biomedical alloy
• Author: Bruna Duspara
• Mentor: Darko Landek (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2023-07-14, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

Biomaterijali su umjetno proizvedeni materijali namijenjeni obnovi ili zamjeni tjelesnih tkiva izloženim djelovanju tjelesnih tekućina. ASTM F 1537 odnosno CoCrMo legura odlikuje izvrsnom otpornošću na koroziju, čvrstoćom i biokompatibilnošću zbog čega ima širok spektar primjene u medicini. Prevlačenjem navedene legure PACVD TiN prevlakom cilj je pospješiti njezina mehanička i tribološka svojstva što je ispitano u sastavu ovog završnog rada.
U eksperimentalnom dijelu istraživanja, provedena je karakterizacija prevlake kroz ispitivanje njezine hrapavosti, debljine i nanotvrdoće. Otpornost na adhezijsko trošenje ispitana je primjenom metode „prizma po prstenu" gdje se ocjenjivao trag trošenja i vrijednost faktora trenja. Prionjivost prevlake ispitana je koristeći uređaj za ispitivanje tvrdoće Rockwell C metodom, a metodom energijske disperzivne spektroskopije (EDS) ustanovljen je kemijski sastav PACVD TiN prevlake.
Iz provedenih ispitivanja utvrđeno je blago povećanje profila hrapavosti TiN prevlake u odnosu na neprevućeni materijal uz pojavu popunjavanja površinskih nepravilnosti. Dobivena je dobra kompatibilnost tribopara prevučenog TiN prevlakom te pojava smanjenja koeficijenta trenja. Prionjivost i debljina prevlake zadovoljavajuće su vrijednosti, a EDS metoda ukazala je na povoljan udio klora u prevlaci koji pridonosi poboljšanju njezinih svojstava.

Abstract (english)

Biomaterials are artificially produced materials intended for the restoration or replacement of body tissues that are exposed to the impact of body fluids. ASTM F 1537 or CoCrMo alloy is characterized by excellent corrosion resistance, strength and biocompatibility, which is why it has a wide range of applications in medicine. By covering the mentioned alloy with a PACVD TiN coating, the goal is to improve its mechanical and tribological properties, which was examined in this final thesis.
In the experimental part of the research, the characterization of the coating was carried out by examining its roughness, thickness and nanohardness. The resistance to adhesive wear was tested using the "block on ring" method, where the wear track and the value of the friction factor were evaluated. The adhesion of the coating was tested using the Rockwell C hardness test device, and the chemical composition of PACVD TiN coating was determined using the energy dispersive spectroscopy (EDS) method.
The conducted tests revealed a slight increase in the roughness profile of the TiN coating compared to the uncoated material, with the appearance of surface irregularities being filled. A good compatibility of the tribocouple coated with a TiN coating was obtained, as well as a decrease in the friction coefficient. Adhesion and thickness of the coating are satisfactory values, and the EDS method indicated a favorable proportion of chlorine in the coating, which contributes to the improvement of its properties.

• Keywords: ASTM F 1537; PACVD; TiN; mehanička svojstva; tribološka svojstva; EDS
• Keywords (english): ASTM F 1537; PACVD; TiN; mechanical properties; tribological properties; EDS
• Language: croatian
• URN:NBN: urn:nbn:hr:235:486842
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-07-11 14:13:21