Compositions: ceramic – Ceramic compositions – Titanate – zirconate – stannate – niobate – or tantalate or...
Patent
1996-01-25
1997-07-22
Marcheschi, Michael
Compositions: ceramic
Ceramic compositions
Titanate, zirconate, stannate, niobate, or tantalate or...
423610, 264 121, C04B 3546
Patent
active
056503660
ABSTRACT:
A ceramic mirror having a surface flatness of no more than 1 .mu.m and/or a centerline average height of no more than 1 nm as measured by the laser interference method, is made from a titanium oxide powder having an average particle diameter of 0.5 .mu.m and a minimum purity of 99.8% by weight. The mirror also has a maximum amount of irregular reflection of incident light not exceeding 5% when the angle of projection is between 0.degree. and 90.degree. as measured by a colorimeter and is made by the process including forming a titanium oxide powder having a maximum average particle diameter of 0.5 .mu.m and a minimum purity of 99.8 wt. %, compacting the titanium oxide powder by cold isostatic pressing to produce a compact, sintering the compact of titanium oxide powder in air at a temperature of 1000.degree. C.-1300.degree. C. to produce a ceramic body, hot isostatic pressing the ceramic body after the sintering in an inert atmosphere at 800.degree. C.-1500.degree. C. under a minimum pressure of 500 kg/cm.sup.2, and machining the sintered body by surface grinding and lapping.
REFERENCES:
patent: 3459503 (1969-08-01), Roy et al.
patent: 3639132 (1972-02-01), Egerton et al.
patent: 4492669 (1985-01-01), Gould
Review of Scientific Instruments, vol. 61, No. 2, Feb. 1990, pp. 728-731.
Journal of Optics, vol. 20, No. 5, Oct. 1989, pp. 219-223.
NTIS Tech Notes, Sep. 1989, p. 728.
Applied Optics, vol. 19, No. 20, Oct. 15, 1980, pp. 3562-3584.
Marcheschi Michael
Nihon Cement Co. Ltd.
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