کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
702020 891065 2011 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Evaluation of hardness, tribological behaviour and impact load of carbon-based hard composite coatings exposed to the influence of humidity
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی برق و الکترونیک
پیش نمایش صفحه اول مقاله
Evaluation of hardness, tribological behaviour and impact load of carbon-based hard composite coatings exposed to the influence of humidity
چکیده انگلیسی

Diamond-like composite coatings were deposited by PACVD with an interface magnetron sputtered metallic layer prepared by d.c. unbalanced magnetron sputtering onto HSS substrates. The focus of the present work was on the study of the humidity effect on the tribological properties, hardness and impact resistance of the deposited coatings. The coatings were tested under both dry and humid conditions using several testing methods, like the pin-on-disc test equipped with linear reciprocating movement, impact test and depth sensing indentation test. It was found that the humidity may substantially influence not only the results of tribological tests, but surprisingly, also the results of the dynamic wear and hardness tests. By increasing the relative humidity, the value of dynamic impact resistance increased at an equivalent stress of 1.6 GPa more than three times. On the other hand, the wear rate of the coated part increased by more than four orders of magnitude. The results of the indentation test were influenced by humidity mainly at nanometre scales. The hardness measured at dry conditions was higher by 25% than the values obtained by the measurements under humid conditions.

Research Highlights
► Humidity can significantly influence the impact resistance of carbon based coatings.
► By increasing the RH, the dynamic impact resistance increases more than three times.
► The wear rate of the coated part increases by more than four orders of magnitude.
► Humid environment may significantly influence the indentation results.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Diamond and Related Materials - Volume 20, Issue 4, April 2011, Pages 596–599
نویسندگان
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