Method of manufacturing composite ceramics balls for ball-point

Details Method of manufacturing composite ceramics balls for ball-point Method of manufacturing composite ceramics balls for ball-point

1997-09-30

1999-11-09

Bell, Mark L.

Etching a substrate: processes

Mechanically shaping, deforming, or abrading of substrate

216 96, 451 50, B43K 108, C04B 4191

Patent

active

059807652

ABSTRACT:
Using a newly developed composite ceramics material suited for balls of ball-point pens, a method of manufacturing composite ceramics balls for ball-point pens that have affinity for both oil-based ink and water-based ink is provided. In this method, the composite ceramics, whose main components are mullite (3Al.sub.2 O.sub.3 .multidot.2SiO.sub.2) and zirconia (ZrO.sub.2) at the ratio of 50-95% to 5-50% by weight, is polished into mirror-finished balls and then chemical processing or physical processing is performed on the ball surfaces to form indentations in the ball surfaces. The chemical processing is preferably an etching using hydrofluoric acid, and the degree of indentations can be controlled by changing the concentration of hydrofluoric acid and the duration of etching.

REFERENCES:
patent: 3520630 (1970-07-01), Gordon et al.
patent: 4318770 (1982-03-01), Chakupurakai
patent: 4621936 (1986-11-01), Hansson et al.
patent: 4653950 (1987-03-01), Yoshida
patent: 4977114 (1990-12-01), Horinouchi et al.

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