Title:
BLACK SILICON NITRIDE-BASED SINTERED COMPACT AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JP3148028
Kind Code:
B2
Abstract:
PURPOSE: To reduce the cumulative reflectance of visible and ultraviolet rays by including specific amounts or more of one or several kinds of Si3N4 and sialon and further prescribed amounts of a colorant and a color tone modifier.
CONSTITUTION: One or several kinds of Si3N4 powder (containing a sintering assistant such as Y2O3) and sialon powder (containing the sintering assistant), one or several kinds of colorants such as TiC, NbC or ZrC and one or several kinds of color tone modifiers such as V and Cr respectively having ≤10μm average particle diameter are mixed at a specific weight ratio and an organic binder and water are further added to the resultant mixture. Kneading is then carried out to provide a slurry, which is dried, granulated and press formed. The formed compact is subsequently heated under no pressure or under ≤10kgf/ cm2 in an N2 atmosphere and sintered at 1700-1850°C to afford the objective black Si3N4-based sintered compact, containing ≥90wt.% Si3N4 and sialon, 0.2-5wt.% colorant and 0.2-5wt.% color tone modifier and having ≤15% cumulative reflectance of visible and ultraviolet rays, ≥8×104kgf/cm2 Young's modulus and ≤2.5×10-6/°C thermal expansion coefficient (at 20-100°C).
Inventors:
Jun Sugawara
Katsumi Hashimoto
Katsumi Hashimoto
Application Number:
JP35149292A
Publication Date:
March 19, 2001
Filing Date:
December 09, 1992
Export Citation:
Assignee:
Nippon Steel Corporation
Kurosaki Harima Co., Ltd.
Kurosaki Harima Co., Ltd.
International Classes:
C04B35/584; C04B35/58; C04B35/599; H01S3/02; (IPC1-7): C04B35/584
Domestic Patent References:
| JP1192766A | ||||
| JP63248773A | ||||
| JP5085479A | ||||
| JP6042278A | ||||
| JP1120486A | ||||
| JP551255A |
Attorney, Agent or Firm:
Takashi Ishida (3 others)