Title: Gas-tight sintered translucent aluminium oxide
Application Number: 86105927 Application Date: 1986.09.06
Publication Number: 1009295 Publication Date: 1987.03.11
Approval Pub. Date: 1990.07.04 Granted Pub. Date: 1990.07.04
International Classifi-cation: C01F7/02;C04B35/10;H01K1/28
Applicant(s) Name: N.V. Philips Address:
Inventor(s) Name: Prud Homme Van Reine;Siebers
Attorney & Agent: YANG GANG
Abstract:
    The invention relates to gas-tight sintered translucent aluminum oxide having a density of at least 99.5%, which contains at most 100 ppm by weight of MgO. According to the invention, the aluminum oxide also has a content of Er2O3 lying between 20 ppm by weight and 200 ppm by weight. The material thus obtained has a great mechanical strength, a high resistance to attack by sodium and a satisfactory translucence. Thus, the material is very suitable for use as wall material for the discharge vessels of high-pressure discharge lamps.
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