SEARCH RESULT

Aluminium alloys widely used because of its high rate of strength/density, good electrical conductivity and high corrosion resistance in automotive and aerospace industries. In recent years, Al-matrix fiber composites have studied and investigated due to increasing strength and decreasing density. In this study, carbon fibers were coated with electroless Ni to investigate composite fiber production conditions with 6063 aluminium alloy. Nickel-coated fibers produced in different thicknesses depending on the coating conditions such as temperature, pH, and time were used in the production of Al-matrix fiber composite using squeeze casting method.

International Symposium on Light Alloys and Composite Materials
UHAKS

Gökçe H. Ağaoğlu Anıl Alten Özen Gürsoy2 Eray Erzi Derya Dışpınar Gökhan Orhan

Titanium is widely preferred in clinical medicine and dentistry because of mechanical properties, high corrosion resistance and biocompatibility. Ti reacts with oxygen in the air to form a stable thin film of TiO2. The TiO2 layer protects Ti from corrosion. However, this layer gets unstable when Ti material is exposed to reducing environment and corrosion can occur. Ti surface can be modified with acids. Surface topography of implants in dental applications is quite important for osseointegration. Modified surface of dental implant increases, osseointegration enhances, and so length of treatment period of patients gets shorter in applications. Surface modification can be performed by many methods such as sandblasting-acid etching (SLA), plasma spraying, coating etc. SLA is most performed technic in all of these. However, most recent studies have shown that sandblasting process before etching could endanger health of patient because of leaving residues in SLA process. So, studies have focused on acid etch modification without sandblasting. HCl, H2SO4, HF, HNO3 etc. are some of the acids used in the process. In this study, the effect of etching with different acid concentrations and with different time on the surface morphology of Ti6Al4V (Grade 5) alloy was investigated. For this purpose, two different experimental study were carried out. In the first one, sulfuric acid (H2SO4) solution was prepared at different concentrations: 48, 60, 75 and 95% for Ti6Al4V alloy plate samples with dimensions of 10x10x2 mm3. The samples were treated with H2SO4 concentrations for different durations: 30, 60, 180 min. at the room temperature in order to comparing the etching effect. The initial and final weights of the samples were measured and the weight change per unit area (Ϫ) was calculated. Surfaces of untreated samples and treated samples with the highest Ϫ value for each concentration were examined by scanning electron microscopy (SEM). The chemical composition of the alloy is shown in Table 1 In the second one, H2SO4 solution was prepared at concentration of 48% for Ti6Al4V alloy cylindrical samples with dimensions of π x 32 x 20 mm3. These samples were treated with concentration of 48% H2SO4 solution for different durations: 30, 60, 90 and 180 minutes at the room temperature and 60°C in order to comparing the etching effect. However, was not calculated for second step of the experimental study, Ϫ values were not calculated but whole samples were examined by SEM.

International Symposium on Light Alloys and Composite Materials
UHAKS

Özen Gürsoy2 Gökçen Erdem A. Günay Bulutsuz Çiğdem Mercan Ezgi Tan A. Bülent Katiboğlu Gökçe H. Ağaoğlu Gökhan Orhan Derya Dışpınar