Pack Siliconizing of Ti6Al4V Alloy

Abstract

In this study, it was aimed to produce titanium silicide layer on Ti6Al4V by a simple, cheap and efficient method of pack siliconizing. Siliconizing was performed in a pack containing a mixture composed of SiO2 powder as siliconizing source, pure Al powder as a reducer for siliconizing, NH4Cl as an activator and Al2O3 powder as filler, at 1000• C for 8, 10 and 12 hours in open atmospheric furnace. Optical microscope and SEM-EDS studies indicate that the morphology of silicide layers has smooth, dense and layered nature. The presence of phases, confirmed by XRD analyses, reveals that the silicide layers formed at 1000• C are composed of TiSi2, Ti3Si5, TiN, TiO2 and SiO2 compounds. Silicide layer thickness was increased with increasing process time and ranged from 7.5 to 9.0 µm. Hardness of silicide layers, measured by Vickers indentation, is over 2100 HV.

Characterization of Hydroxyapatite Coating on Ti6Al4V by Sol-gel Method

“…HA is widely used as a substitute for bones and teeth owing to its excellent biocompatibility and its similar structure with the mineral part of the bone. However, its mechanical properties such as strength, hardness and toughness do not comply with mechanical properties of bone [6,8]. Sol-gel process is an attractive alternative to other methods for synthesis of ceramics and glasses for many reasons: for example, low temperature synthesis, simple equipment to be used, thin film formability and so on [9][10][11].…”

Assessment of Processing Parameters of Pack Silicon Cementation onto P265GH Grade Steel

“…X 4 -the proportion of the activator in the mixture-NH 4 Cl. The neutral component, with the role of blocking the sintering tendency of the powdery solid media, was Al 2 O 3 , and its proportion was calculated according to the formula [1,2,11,[15][16][17]19,20]: %Al 2 O 3 = 100 − Σ (%FeSi + %NH 4 Cl).…”

“…Silicon cementation can also be applied to landmarks made of alloys with a different base than that of iron, for example, aluminum-bronze alloys, providing them with a substantial reduction in the coefficient of friction simultaneously with an increase in wear resistance [14] or alloys with a titanium base [15,16], in order to increase the resistance to oxidation at high temperatures, as well as composite materials [12].…”