Preparing a scandate cathode by impregnating a porous tungsten b

Details Preparing a scandate cathode by impregnating a porous tungsten b Preparing a scandate cathode by impregnating a porous tungsten b

1991-07-17

1992-05-19

Beck, Shrive

Coating processes

Electrical product produced

Electron emissive or suppressive

4271263, 427295, 4273764, 445 50, 445 51, B05D 512

Patent

active

051147424

ABSTRACT:
An improved scandate cathode having an increased emission density is prepared from a porous tungsten billet that has been impregnated with Ba.sub.3 Al.sub.2 O.sub.6 by coating the top surface of the impregnated billet with a mixture of Sc.sub.6 WO.sub.12,Sc(WO.sub.4).sub.3, and W in the mole ratio of 1:3:2, heating the billet to about 1000.degree. C. in a vacuum to cause BaWO.sub.4 and Sc to form in the billet in a molar ratio of 1:1, removing the billet and cleaning in a jewelers lathe, and preparing the billet for a cathode environment.

REFERENCES:
patent: 2869017 (1956-10-01), Levi
patent: 4236287 (1979-06-01), Smith
patent: 4273683 (1981-06-01), Kawamura
patent: 5041757 (1991-08-01), Longo et al.
S. Yamamoto, S. Taguchi, I. Watanabe and S. Kawase; "Impregnated cathode ted with Tungsten Thin Film Containing Sc.sub.2 O.sub.3 ", J.Vac. Sci. Technol.A5(4), Jul./Aug. 1987, pp. 1299-1302.
E. S. Rittner, W. C. Rutledge, and R. H. Ahlert, "On the Mechanism of Operation of the Barium Aluminate Impregnated Cathode", Journal of Applied Physics, vol. 28, No. 12, Dec. 1957, pp. 1468-1473.

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