High temperature gas nitridation of thermally sprayed coatings of Ti and Ti containing Ni5Al5Mo

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• 作者：Somchai Thongtem ; Poonlarp Jentrakul and Titipun Thongtem
• 关键词：Thermally sprayed coatings ; High temperature gas nitridation ; Titanium nitride(s)
• 刊名：Journal of Materials Processing Technology
• 出版年：2006
• 出版时间：25 May 2006
• 年：2006
• 卷：174
• 期：1-3
• 页码：218-222
• 全文大小：380 K

文摘

Titanium and a mixture of 1:1 weight ratio titanium and bond coat (Ni–5 wt. % Al–5 wt. % Mo) were thermally sprayed on mild steel disks which were subsequently nitrided in 10 cm³ s⁻¹ ammonia at 1200 K to form titanium nitride(s). The coatings were analyzed using XRD and EDX to determine phases and elements contained in the phases. Knoop hardness (HK) values of the Ti and the mixture coatings at 25 μm depth with 1200 K nitridation are 1216.2 ± 112.5 and 1124.9 ± 221.8 kg mm⁻², respectively. Pin-on-disk wear rates of the coatings with 1200 K nitridation are three orders of magnitude higher than those of the tungsten carbide pin.