کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5362428 1388285 2009 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Planarization machining of sapphire wafers with boron carbide and colloidal silica as abrasives
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Planarization machining of sapphire wafers with boron carbide and colloidal silica as abrasives
چکیده انگلیسی
The as-cutted sapphire wafers are planarized by the grinding and polishing two-step machining processes with micrometer B4C and nanometer silica as abrasives, respectively. The material removal rates (MRRs) of two processes are measured. During the polishing process, the MRR increases with the down-pressure increased, whereas the rotational speeds have less effect on the MRR. The alkaline colloidal silica is more favorable than the acidic to polish sapphire wafer. The ground and polished surfaces of the substrate are compared by scanning electron microscopy, atomic force microscopy, and X-ray rocking curves. Our results show that B4C abrasives are effective in elimination of the ununiformity in thickness within a wafer. The colloidal silica can achieve a nanoscale flatness of wafer, but the lasting polishing time seems unfavorable. The polishing process is also analyzed in terms of chemical mechanical polishing mechanism.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 255, Issue 19, 15 July 2009, Pages 8230-8234
نویسندگان
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