| 摘要 |
This invention relates to a ball-point pen ball made of nonoxide ceramic and formed into a spherical body whose surface contains voids each having an average pore diameter of less than 75 mu m and more than 0.1 mu m. The ball thus made is not only almost free from "ball sunk", "nonuniformity in writing line thickness", "ball break", etc. but also excellent in affinity with ink and assures steady writing characteristic over a long period of time.
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