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Tribological Behavior of Borided CP Titanium (Grade-2) Under Linear Reciprocating Sliding Conditions

Gokhan Kara, GencagaPurcek,    Tribological Behavior of Borided CP Titanium (Grade-2) Under Linear ReciprocatingSlidingConditions, IBERTRIB 2017 – IX Iberian Conference on Tribology, University of Minho, June 12-13, 2017, Guimarães, Portugal.

Introduction
Titanium and its alloys are widely used in engineering applications because of their excellent mechanical properties, low density and good corrosion resistance. However, they generally have poor wear resistance and surface integrity leading to galling and seizure of the surfaces [1-3]. In this study, commercially pure (Gr-2) Ti was borided by solid state diffusion process in order toachieve a hard and adhered coating layer and to improve their tribo-mechanical properties. Boriding was applied in a solid medium by applying annealing processes at various temperatures. Microstructural and morphological characteristics of borided layers were examined using XRD and SEM techniques. Hardness, wear resistance and adhesion properties of borided layers were investigated in detail and they were correlated well with the structure of borided layers. Dry wear tests were performed on the sample borided at 1100ºC for 24 h due to its highest TiB2 layer thickness. The tests were conducted against to a 6 mm diameter WC ball us ng a pin-on-disc type tribometer (UTS Tribometer-T30MT) under reciprocating sliding condition. The wear tests were conducted at a sliding speed of 3.6 cm.s–1 for a constant sliding distance of 200 m, with a stroke of 6 mm and a frequency of 3 Hz. The test load was 7 N for unborided titani m and 7 N to 32 N loads with 5 N intervals for borided ones.

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