Abstract: A thermal actuator is taught for a micro-electromechanical device. The thermal actuator includes a base element, a cantilevered element extending from the base element and normally residing in a first position. The cantilevered element includes a first layer constructed of a dielectric material having a low thermal coefficient of expansion and a second layer attached to the first layer, the second layer comprising intermetallic titanium aluminide. A pair of electrodes are connected to the second layer to allow an electrical current to be passed through the second layer to thereby cause the temperature of the second layer to rise, the cantilevered element deflecting to a second position as a result of the temperature rise of the second layer and returning to the first position when the electrical current through the second layer is ceased and the temperature thereof decreases. The thermal actuator has particular application in an inkjet device wherein a series of such inkjet devices form an inkjet printhead.

Abstract: A thermal actuator is taught for a micro-electromechanical device. The thermal actuator includes a base element, a cantilevered element extending from the base element and normally residing in a first position. The cantilevered element includes a first layer constructed of a dielectric material having a low thermal coefficient of expansion and a second layer attached to the first layer, the second layer comprising intermetallic titanium aluminide. A pair of electrodes are connected to the second layer to allow an electrical current to be passed through the second layer to thereby cause the temperature of the second layer to rise, the cantilevered element deflecting to a second position as a result of the temperature rise of the second layer and returning to the first position when the electrical current through the second layer is ceased and the temperature thereof decreases. The thermal actuator has particular application in an inkjet device wherein a series of such inkjet devices form an inkjet printhead.

Abstract: A dielectric member with an integral, electrically conductive surface is made by molding a substrate from a zirconia alloy powder using a tape casting process. The resulting green substrate is sintered and after sintering may be cut to the final desired size and shape. Once the insulating ceramic substrate has been formed, the surface of the substrate is modified using infrared laser energy. Through the impingement of infrared laser radiation upon the surface of the ceramic substrate, an electrically conductive region is produced on the surface of the substrate. In such manner, the entire surface can be made electrically conductive or a particular pattern can be traced. As an integral part of the substrate, the surface will not delaminate from the substrate. Further, because the modified surface region and the substrate are both a zirconia, the coefficients of thermal expansion of the substrate and the modified surface region will be closely matched.

Abstract: Long wearing and reusable lithographic printing members are prepared from a ceramic that is a composite of a zirconia alloy and .alpha.-alumina. In use, a surface of the zirconia-alumina composite ceramic printing member is imagewise exposed to electromagnetic radiation which transforms it from a hydrophilic to an oleophilic state or from an oleophilic to a hydrophilic state, thereby creating a lithographic printing surface which is hydrophilic in non-image areas and is oleophilic and thus capable of accepting printing ink in image areas. Such inked areas can then be used to transfer an image to a suitable substrate in lithographic printing. These printing members are directly laser-imageable as well as image erasable.

Abstract: Preparing an electrically conductive ceramic composite by the steps of:1) mixing and milling tetragonal zirconia alloy or a composite of zirconia-alumina with zirconium diboride, and2) pressing in a die and sintering in an argon atmosphere between 1300.degree. and 1700.degree. C.

Abstract: (Barium hafnate:Ti,Ce,Pb) phosphors, phosphor screens and phosphor preparation method. The phosphor screen includes a support and a luminescent portion. The phosphor includes oxygen and a combination of species characterized by the relationship:(Ba.sub.1-d M.sub.d)(Hf.sub.1-z-e Zr.sub.z Mg.sub.e):yCe,y'Ti,y"Pbwhere M is selected from the group consisting of Ca, and Sr, and combinations thereof; d is from 0 to 0.05; z is from 0 to 0.25; e is from 0 to 0.15; y is from 0 to 0.025; y' is from 0 to 0.05; y" is from 0 to 0.01; and y+y'+y" is from 1.times.10.sup.-6 to 0.05. The phosphor is x-ray luminescent at a temperature of 300.degree. K.

Abstract: A method for preparing a ceramic composite having a core/bulk of tetragonal zirconia alloy and a shell/surface comprising zirconium boride by sintering a zirconia or zirconia and alumina composite article in an argon atmosphere while in contact with boron carbide.

Abstract: (Barium halfnate:Cu) phosphors and phosphor screens. The phosphor screens include a support and a luminescent portion. The phosphor includes oxygen and a combination of species characterized by the relationship: (Ba.sub.1-q M.sub.q)(Hf.sub.1-z-e Zr.sub.z Mg.sub.e):yT where M is selected from the group consisting of Ca and Sr and combinations thereof; T is Cu; q is from 0 to 0.15; z is from 0 to 1; e is from 0 to 0.10; z+e is from 0 to 1; and y is from 1.times.10.sup.-6 to 0.02.

Abstract: A ceramic article containing a core/bulk comprising tetragonal zirconia or tetragonal zirconia and alumina composite wherein zirconia is preferably doped with yttria, and a shell/surface comprising zirconium boride.

Abstract: A method for making a dielectric member with an integral, electrically conductive surface is made by molding a substrate from a zirconia alloy powder using a tape casting process. The resulting green substrate is sintered and after sintering may be cut to the final desired size and shape. Once the insulating ceramic substrate has been formed, the surface of the substrate is modified using infrared laser energy. Through the impingement of infrared laser radiation upon the surface of the ceramic substrate, an electrically conductive region is produced on the surface of the substrate. In such manner, the entire surface can be made electrically conductive or a particular pattern can be traced. As an integral part of the substrate, the surface will not delaminate from the substrate. Further, because the modified surface region and the substrate are both a zirconia, the coefficients of thermal expansion of the substrate and the modified surface region will be closely matched.

Abstract: Electrically conductive ceramic composite articles comprising tetragonal zirconia or a composite of zirconia-alumina and zirconium diboride.

Abstract: An alumina ceramic article and a method for preparing the article. The method comprises the steps of:(1) Compacting a mixture of a first concentration of particulate aluminum oxide sufficient to prevent retention of the zirconium oxide alloy particles in the shell in a predominantly tetragonal crystal structure and a second concentration of particulate zirconium oxide alloy. The zirconium oxide alloy is zirconium oxide and a secondary oxide selected from the group consisting of MgO, CaO, Y.sub.2 O.sub.3, Sc.sub.2 O.sub.3, CeO.sub.2, and rare earth oxides having a concentration of secondary oxide generally of about 0.5 to about 5 mole percent Y.sub.2 O.sub.3, from about 0.1 to about 1 mole percent MgO, from about 0.5 to about 15 mole percent CeO.sub.2, from about 0.5 to about 7.0 mole percent Sc.sub.2 O.sub.3, or from about 0.5 to about 5 mole percent CaO, relative to the total of the zirconium oxide alloy. The compacting results in the formation of a blank.

Abstract: A ceramic article containing a core comprising zirconia and ZrB.sub.2 composite wherein zirconia is preferably doped with yttria, and a shell comprising zirconium nitride.

Abstract: A method for preparing a ceramic article, the method comprising the steps of:1) compacting a mixture of particulate zirconium diboride and a zirconium oxide or zirconium oxide alloy or composite thereof which results in the formation of a block and2) sintering the block in a mixture of nitrogen and hydrogen to form a ceramic with a core comprising zirconia and a shell comprising zirconium nitride.

Abstract: A phosphor composition is disclosed containing a titanium free hafnium zirconium germanate phosphor which emits electromagnetic radiation principally in the spectral region to which silver halide exhibits native sensitivity. To maximize the intensity of emission the ratio of host metals satisifies the relationship:D.sub.1+x Ge.sub.1-xwhereD is the combined sum of zirconium and hafnium andx is 0.15 to -0.50.An X-ray intensifying screen is disclosed containing the phosphor composition.

Abstract: A phosphor composition is disclosed containing a titanium activated hafnium zirconium germanate phosphor which emits electromagnetic radiation principally in the spectral region to which silver halide exhibits native sensitivity. To maximize the intensity of emission the ratio of host metals satisfies the relationship:D.sub.1+x Ge.sub.1-xwhereD is the combined sum of zirconium and halnium andx is 0.25 to -0.70.An X-ray intensifying screen is disclosed containing the phosphor composition.

Abstract: An intensifying screen for producing a latent image in a silver halide radiographic element upon exposure to an image pattern of X-radiation is disclosed. The intensifying screen contains a fluorescent layer containing a phosphor capable of absorbing X-radiation and emitting longer wavelength electromagnetic radiation comprised of monoclinic crystals of a titanium activated zirconium hafnium oxide phosphor host. The phosphor contains in an amount sufficient to enhance emission of the longer wavelength electromagnetic radiation at least one alkali metal in combination with at least one Group 14 dopant chosen from Periods 3, 4 and 5.

Abstract: An intensifying screen is disclosed containing a phosphor composition comprised of monoclinic crystals of a titanium activated hafnia phosphor host containing yttrium ions to reduce afterglow. A phosphor composition in which zirconia is at least partially substituted for hafnia is also disclosed.

Abstract: An intensifying screen is disclosed containing a phosphor composition comprised of monoclinic crystals of a titanium activated hafnia phosphor host containing neodymium ions to reduce afterglow. A phosphor composition in which zirconia is at least partially substituted for hafnia is also disclosed.

Abstract: An intensifying screen is disclosed containing a phosphor composition comprised of monoclinic crystals of a titanium activated hafnia phosphor host containing ions of one or more rare earths selected from among those having an atomic number of 39, 62 to 64 inclusive, and 67 to 71 inclusive. A phosphor composition in which zirconia is at least partially substituted for hafnia is also disclosed.