Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2017 - zeszyt 2

Short-term ion nitriding process with active screen of technical titanium

nr katalogowy: 105201

Studies were carried out on technical titanium Ti99.2 EN10204-3.1 (Grade 2 ASTM) after ion nitriding process in range of temperature between 650°C to 700°C during the time t = 5 h. Process was conducted in nitrogen atmosphere under pressure p = 150 Pa. Samples during nitriding process were put on cathode and additionally they were covered with active screen. Microhardness studies of surface and analysis of obtained surface layer structure allowed to evaluate the role of ion bombardment during the activation of nitride metallic surface. The effect of ion bombardment during the ion nitriding process on the surface of titanium caused to reduce harmful effects of trace amounts of carbon and oxygen impurities. Processes performed at temperature below 700°C did not allow to produce an uniform zone nitride on the surface subjected to the gas nitriding. It has been shown that nitriding processes carried out at 650°C and 675°C result in the formation of homogeneous nitrided layers only on the surface subjected to plasma effects. The surface layers created by gas nitriding are characterized by a lower microhardness of the surface. It was found that the increase of the process temperature to 700°C resulted in the formation of nitride layers with comparable properties on both surfaces of the sample, as confirmed by measurements of surface microhardness. It has been found nearly 2.5-fold increase in the surface microhardness variant adopted for the ion nitriding at 700°C for material in the initial state. Key words: ion nitriding, active screen, titanium.1. INTRODUCTION Titanium and titanium alloys have some very attractive properties which allow them to be used in many industries. Some of their advantages are: excellent corrosion and erosion resistance, low densities which give them high strenght-to-weight ratios allowing to obtain stronger structures, high-temperature capability and in some cases cryogenic properties [1]. They are widely used in aeros[...]

Bibliografia

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