کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1525546 995357 2009 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Thermochemical sliding interactions of short carbon fiber polyimide composites at high pv-conditions
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Thermochemical sliding interactions of short carbon fiber polyimide composites at high pv-conditions
چکیده انگلیسی

Thermoplastic polyimides are reinforced with short carbon fibers (30 wt.%) and slid in a line contact over a broad interval of normal loads (50–200 N) and reciprocating sliding velocities (0.3–1.2 m s−1). The carbon fibers reduce the wear rates, while they either increase or decrease the coefficients of friction. The sliding mechanisms, when analysed from a mechanical point of view and considering the visco-elastic deformation, do not explain the variations in friction over the entire testing range. A new approach is introduced, considering the thermochemical modifications in the polyimide matrix. The polymer surface temperature T* is related to a product of contact pressure and sliding velocity (pv). Hydrolysis of the polyimide at intermediate pv-conditions disfavours the sliding properties of the carbon fiber composite, while imidisation under higher pv-conditions stimulates the lubricating efficiency of the carbon fibers. The formation of a monomer fraction at extremely high pv decreases the coefficients of friction due to the formation of a mixed transfer film.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 115, Issue 1, 15 May 2009, Pages 185–195
نویسندگان
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