Title:
SEAL
Document Type and Number:
Japanese Patent JP3020663
Kind Code:
B2
Abstract:
PURPOSE: To provide a seal susceptible to precise printing processing, excellent in abrasion resistance and corrosion resistance and showing a gold or silver color by applying stamping processing to a sintered alloy based on TiN or TiC and having a mean crystal particle size of a specific value or less and a specific range of voids after baking.
CONSTITUTION: A molded body based on TiN or TiC is heated and baked under vacuum by a hot press or HIP to form a golden or silver-colored sintered alloy which is, in turn, used to prepare the part containing at least a printing surface of a seal. By setting the mean crystal particle size of the sintered alloy to 3μm or less, the sintered alloy is improved in the spread of red seal-ink and made hard to damage and, by setting the voids of the sintered alloy to 0.3-5%, the stress acting on one particle is reduced and the separation of particles is suppressed. After baking, stamping processing due to a blasting method, a Honing method, a water jet method, a laser beam method or a discharge processing method is applied to the sintered alloy to prepare a seal excellent in printability.
Inventors:
Kozuma Yosuke
Application Number:
JP19231891A
Publication Date:
March 15, 2000
Filing Date:
July 31, 1991
Export Citation:
Assignee:
Kyocera Corporation
International Classes:
B41K1/02; B41K1/00; B41K1/50; C22C29/00; C22C29/02; C22C29/10; C22C29/16; C22C32/00; (IPC1-7): B41K1/50; B41K1/00; C22C29/10; C22C29/16
Domestic Patent References:
| JP62212257A | ||||
| JP62292313A | ||||
| JP60131861A |