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- W1669278764 abstract "Abstract Chromium oxide (Cr2O3) is found to be an excellent abrasive for polishing of silicon nitride (Si3N4) work material. As the hardness or Cr2O3 is nearly the same as that of Si3N4, it appears that the mechanism of material removal would be more chemical action than mechanical abrasion. However, no evidence of any compound formation of Si3N4 work material with Cr2O3 abrasive has been reported in the literature thus far. Instead, the role of Cr2O3 was considered to be one of a catalyst, in view of the well known role of Cr2O3 as a catalyst, rather than its direct involvement in the chemical reactions with Si3N4. In this paper, we report new evidence on the chemomechanical action by examining the wear debris generated in polishing Si3N4 work material with Cr2O3 abrasive using a scanning electron microscope with an X-ray microanalyser and a small-angle X-ray diffraction apparatus. The analysis shows conclusively that Cr2O3 does participate in chemomechanical polishing of Si3N4 to form chromium nitride and chromium silicate, thus establishing the role of Cr2O3 not as a mere catalyst but as actively taking part in the chemical reactions during chemomechanical polishing. A new model of the chemomechanical polishing of Si3N4 work material in air and in water environments with Cr2O3 abrasive is presented. This model is based on the formation of such reaction products as chromium silicate and chromium nitride in addition to the formation of a silica layer on Si3N4 surface as well as gaseous reaction products, such as ammonia (in water) and nitrogen (in air)." @default.
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- W1669278764 date "1996-10-01" @default.
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- W1669278764 title "On chemomechanical polishing of Si<sub>3</sub>N<sub>4</sub>with Cr<sub>2</sub>O<sub>3</sub>" @default.
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- W1669278764 doi "https://doi.org/10.1080/01418619608242173" @default.
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