Transparent polycrystalline aluminium oxide

Details Transparent polycrystalline aluminium oxide Transparent polycrystalline aluminium oxide

2008-07-08

2008-07-08

Group, Karl E (Department: 1793)

Compositions: ceramic

Ceramic compositions

Aluminum compound containing

C501S105000, C313S636000

Reexamination Certificate

active

10520315

ABSTRACT:
The present invention relates to highly dense translucent and transparent aluminium oxide components for applications, e.g. in the lighting industry, where a fine crystal size has to be obtained and stabilized for use at temperatures of 800° C. or more. Disclosed are high-strength polycrystalline alumina products which include 0.001-0.5 weight-% ZrO2stabilizing a fine crystal size <2 μm or, preferably, <1 μm if used at temperatures of 800° C. or more. The microstructure exhibits an extremely high relative density enabling a high real in-line transmission >30% measured over an angular aperture of at most 0.5° at a sample thickness of 0.8 mm and with a monochromatic wavelength of light λ, preferably, of 645 nm.

REFERENCES:
patent: 4285732 (1981-08-01), Charles et al.
patent: 4861737 (1989-08-01), Prud'Homme van Reine et al.
patent: 5028362 (1991-07-01), Janney et al.
patent: 5376606 (1994-12-01), Kim et al.
patent: 5382556 (1995-01-01), Takahashi et al.
patent: 5625256 (1997-04-01), Tiedt et al.
patent: 5682082 (1997-10-01), Wei et al.
patent: 6417127 (2002-07-01), Yamamoto et al.
patent: 6844285 (2005-01-01), Wei
patent: 2005/0156527 (2005-07-01), Vries et al.
patent: 756586 (1995-10-01), None
patent: 0756586 (1997-02-01), None
patent: 1053983 (2000-11-01), None
patent: 1187175 (2002-03-01), None
patent: 58-161968 (1983-09-01), None
patent: 6-211569 (1994-08-01), None
Oh-Hun Kwon et al; “Submicrometer Transparent Alumina by Sinter Gorging Seeded Gamma—A1203 Powders”, Jour, of the American Ceramic Soc., Columber, vol. 78, No. 2, Feb. 2, 1995, pp. 491-494, XP002165586.
H. Mizuta et al; “Preparation of High-Strength and Translucent Alumina by Hot Isostatic Pressing”, Jour. of the American Ceramic Soc, Columbus, vol. 75, No. 2, Feb. 1992, pp.469-473, Feb. 1992, XP002165587.
K. Hayashi et al; “Transmission Optical Properties of Polycrystalline Alumina with Submicron Grains”, Materials Trans Jim Sendaj, JP, vol. 32, No. 11, 1991. pp. 1024-1029.
“Anisotropy of Grain Growth in Alumina” Jurgen Rodel et al., Journal, J. Am Ceram, Soc. 73, No. 11, Dec. 1990. pp. 3292-3301.
“Preparation of High-Strength and Translucent Alumina” by Hot Isotatic Pressing, Hiroyuki Misuta, et al. Journal, pp. 469-473.
“Transmission Optical Properties of Polycrystalline Alumina with Submicron Grains” Koichi Hayashi et al., Materials Transactions, JIM, vol. 32, No. 11 (1991). pp. 1024-1029.

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