International Business Machines Corporation

Merrill W Shafer

Carlos Juan Sambucetti

Ifay Fay Chang

Joseph W Mitchell

G V Chandrashekhar

An improved glass or silicon ink jet nozzle is described having a three-layer coating that provides improved mechanical and chemical properties. The coating includes a first layer of silicon nitride, an intermediate layer graded in composition, and a top-most layer of aluminum nitride. The intermediate layer is typically a solid solution of silicon and aluminum nitrides being silicon-rich at the interface with the silicon nitride layer, and aluminum-rich at the interface with the overlying aluminum nitride layer. This three-layer coating provides the required dielectric properties, displays very low wettability, and is extremely corrosion resistant to all types of inks.

Stable surface coating for ink jet nozzles

The present invention provides a process for electrolytic printing using an improved electrode. The electrode has a region which is an oxide of a metal from the group of ruthenium, iridium, platinum or an alloy thereof. The oxide region is at the extremity of the electrode which during the printing is in close proximity to the printing medium. This oxide region provides an increase in wear resistance of about two orders of magnitude over non-oxidized electrodes. Method for fabricating the described electrode is also set forth.

Electrolytic printing process with wear resistant electrode

A series of solid solutions in the systems Zn.sub.2 SiO.sub.4 -Zn.sub.2 M.sup.+3.sub..5 M.sup.+5.sub..5 O.sub.4, is synthesized by practice of this disclosure. Solid reaction technique is used where M.sup.+3 and M.sup.+5 signify ions from Groups III and V of the periodic table. Large increases in the efficiency compared to the prior art P1 phosphor (Zn.sub.2 SiO.sub.4 :Mn) are achieved by substituting various combinations of Group III and V oxides for SiO.sub.2, e.g., Al and P to provide Zn.sub.2-y Mn.sub.y Si.sub.1-2x Al.sub.x P.sub.x O.sub.4. The photoluminescence efficiency of the phosphors of this disclosure exhibit strong dependence on the III-V substitution concentration, x, having highest efficiency for the approximate range of x=0.25% to 1.5%.

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Yorktown Heights, NY, United States of America

Merrill W Shafer