کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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620220 | 1455074 | 2006 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: GI-XRD studies on surface structure of ultrafine Ti(C0.5N0.5)-WC-Ni cermets at high temperature GI-XRD studies on surface structure of ultrafine Ti(C0.5N0.5)-WC-Ni cermets at high temperature](/preview/png/620220.png)
Influence of coarse and ultrafine particle size of Ti(C0.5N0.5) on the high-temperature stability of various Ti(C0.5N0.5)-WC-Ni cermets under oxidizing atmosphere were compared. The evolved surface microstructure was correlated to the wear performance of the cermet exposed to similar thermophysical conditions. Investigation by glancing incidence X-ray diffraction revealed a considerable fraction of TiO2, TiC and TiN in the near surface layer of the cermet heat treated at ∼873 K. Ultrafine cermets showed good high-temperature wear resistance, which was ascribed to the homogenous distribution of the ultrafine hard phase grains along with high total hard phase content of ∼82–85 vol.%. Comparable wear performance in coarse cermets with 5 and 15 wt.% WC was also observed in spite of a low total hard phase content (66–72 vol.%), which was attributed to the high TiN in the surface. The presence of high amount of NiO (∼22 vol.%) and low Ni in the surface layer of WC-rich (25 wt.%) coarse grade cermet contributed to its poor high-temperature wear resistance
Journal: Wear - Volume 261, Issues 3–4, 30 August 2006, Pages 360–366