| 简介 |
PROBLEM TO BE SOLVED : To provide a cerium type abrasive capable of restraining the generation of a scratch which cannot be eliminated by conventional cerium type abrasives. SOLUTION : In a cerium oxide type abrasive containing 45-70 wt% cerium oxide to the total rare earth oxides, this cerium type abrasive has such characteristic that if the ratio of the main peak intensity of the LnOF to the main peak intensity of the CeO2, (LnOF/CeO2), measured by an X-ray diffraction method (using a copper target, and Cu-Kα1 line) for the cerium type abrasive is S0, and that measured in the same manner for coarse particles separated from the cerium type abrasive having a diameter of not smaller than 5 μm is S1, they satisfies the relations S0 ≤0.6 (1) and 0.2≤S1/S0≤1.2 (2). COPYRIGHT : (C)2004, JPO&NCIPI |
客服热线：
手机版
二维码
