| 摘要 |
PURPOSE:To obtain an inexpensive knife for ultra-microtome whose performance is not easily lowered, by giving the grinding and chemical polishing to a face of a parallelepiped which is cut out of a natural or artificial quartz in such a way that the angle between the faces forming a ridgline that is used as the edge of a blade is set at 10 - 70 deg.. CONSTITUTION:A face 2 of a parallelepiped cut out of a natural or artificial quartz is ground by a grinder so that the angle theta between faces 3 and 2 that form a ridgeline 1, i.e., the edge of a blade is set at 10 - 70 deg.. Furthermore the #4,000GC abrasive grain is used to polish the face 2 on a copper lapping plate by about 100mum, and then the face 2 is polished into a mirror surface on a lapping plate formed by bonding the ''Polytex '' to the oxidized Ce fine grain. Then the chemical polishing is carried out for 5min at 300 deg.C with use of the aqueous solution of 60% KOH to be followed by the water washing and drying. After this a microscope of a 800-magnification ratio is used to check the cracks. In such a way, an inexpensive ultramicrotome knife is obtained with its performance that is not easily lowered. |
