کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1663494 1517707 2006 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sliding wear behavior of WC–12% Co coatings at elevated temperatures
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
Sliding wear behavior of WC–12% Co coatings at elevated temperatures
چکیده انگلیسی

WC–Co coatings with low degree of decomposition were thermally sprayed by a high velocity oxy-fuel system from three agglomerated WC–12 mass% Co powders with different carbide grain size distributions. Dry sliding friction and wear behavior of the WC–12% Co coatings was investigated by using sintered alumina (Al2O3) as the mating material at 200 °C, 300 °C and 400 °C. The friction coefficient of these WC–Co/alumina pairs was nearly constant regardless of the test temperature and the carbide grain size of the coatings. The specific wear rate of the coatings increased with increasing the carbide grain size at a given testing temperature. It decreased with increasing the temperature for a given carbide grain size. The specific wear rate was reduced by more than one order of magnitude when the test temperature was increased from room temperature to 400 °C. The microscopic analyses of the worn tracks showed that the tribofilm formed at higher temperature is denser and more adhesive to the underlying surface, thus providing more surface protection against wear. The results show that the formation of dense and adhered tribofilms plays an important role on the low sliding wear rate of the coatings at elevated temperatures.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface and Coatings Technology - Volume 200, Issues 14–15, 10 April 2006, Pages 4208–4212
نویسندگان
, , ,