Effect of plasma nitriding treatment on structural, tribological and electrochemical properties of commercially pure titanium

Abstract

In this study, plasma nitriding treatment was applied to commercially pure titanium (Grade 2). Structural properties, electrochemical and tribological behaviours of the nitrided pure titanium specimens were comparatively investigated. Microstructure and morphology of the plasma nitrided specimens were analysed by X-ray diffraction and scanning electron microscopy. Furthermore, corrosion tests were conducted in Ringer's solution, which represents a human body environment, to determine electrochemical properties. Then, tribological and frictional properties were investigated using pin-on-disc tribometer, and a micro-hardness tester was used to measure the hardness of the coatings. The results showed that plasma nitrided specimens exhibited higher surface hardness than the untreated specimens did. In addition, the plasma nitrided specimens at 700 °C presented significantly better performance than the other plasma nitrided specimens (at 500 °C and 600 °C) under dry wear conditions. Moreover, corrosion test results showed that corrosion behaviours of untreated and nitrided samples had similar characteristic.

Electroless deposition of nickel boron coatings using morpholine borane as a reducing agent

“…Figure 2 shows the surface morphology of as-prepared NiB coatings deposited from the plating bath operated As evident from the data in Fig. 2, the surface morphology of all the coatings presents a typical cauliflower-like texture [44][45][46][47][48]; however, the surface morphology of the NiB coatings depends on the plating bath pH. It is clearly seen that all the coatings are nodulous, and with an increase in plating bath pH, the size of the surface features is significantly modified.…”

Selection application of material to be used in hip prosthesis production with analytic hierarchy process

“…They are made from natural or synthetic materials, which stay in constant or periodic contact with body fluids [1]. Such biomaterials as ceramics, metals, polymers or composite materials can be used [2][3][4][5][6][7][8][9][10][11][12][13][14]. One of the most important features ex-pected from biomaterials is biocompatibility.…”

Microstructure and Phase Transformation of Pure Titanium During Nitriding Process by High Density Plasma

“…In order to improve such properties, one promising way of titanium surface engineering is through the formation of titanium nitride (TiN) on the top surface [6,11]. Nowadays, there is a growing interest in the methods of thermo-chemical treatment with diffusion saturation of material surface by an element such as nitrogen [12].…”

“…Nowadays, there is a growing interest in the methods of thermo-chemical treatment with diffusion saturation of material surface by an element such as nitrogen [12]. The nitriding process of titanium typically involves a high temperature of 700-1000 C which can harden the surface material up to 1300 HV [5,11]. Plasma nitriding is a thermo-chemical method that can control the phase formation and the depth of the nitrided layer [3][4][5]13].…”