摘要:
A method for fabricating a multiwound microcoil embedded in a ceramic substrate including the steps of forming a sacrificial multiwound microcoil, having a melting temperature greater than the sintering temperature of the ceramic material to be used as the ceramic substrate by wrapping a first sacrificial coil winding in a helical fashion on the midsection of a sintered ceramic bar thereby forming a one winding sacrificial coil structure; wrapping a first layer of tape cast ceramic material around the midsection of said one winding sacrificial coil structure thereby forming a first coated one winding sacrificial coil structure; wrapping a second sacrificial coil winding in a helical fashion on the midsection of said first coated one winding sacrificial coil structure thereby forming a two winding sacrificial coil structure. The method further includes forming green ceramic material into the shape of the ceramic substrate incorporating said formed sacrificial multiwound microcoil; sintering the green ceramic material; removing the sacrificial multiwound microcoil from the sintered ceramic substrate; flowing molten electrically conductive material into the space relinquished by the removed sacrificial multiwound microcoil; and cooling the molten electrically conductive material to fabricate the multiwound microcoil embedded in a ceramic substrate.
摘要:
A method of making a hydrodynamic ceramic bearing includes the steps of providing ceramic powder comprising a first concentration of particulate aluminum oxide and a second concentration of particulate zirconium oxide alloy. The zirconium oxide alloy consists essentially of zirconium oxide and a the group consisting of MgO, CaO, Y.sub.2 O.sub.3, Sc.sub.2 O.sub.3, and rare earth oxides. The zirconium oxide alloy has a concentration of the secondary oxide of, in the case of Y.sub.2 O.sub.3, about 0.5 to about 5 mole percent; in the case of MgO, about 0.1 to about 1.0 mole percent, in the case of CeO.sub.2, about 0.5 to about 15 mole percent, in the case of Sc.sub.2 O.sub.3, about 0.5 to about 7.0 mole percent and in the case of CaO from about 0.5 to about 5 mole percent, relative to the total of the zirconium oxide alloy, the compacting further comprising forming a blank. A mold is provided for receiving and processing the ceramic powder thereby forming a ceramic billet. Shaping of the ceramic billet is undertaken to form a near net-shaped ceramic bearing. Thereafter, the near net-shaped ceramic bearing is sintered resulting in a sintered ceramic bearing. After sintering, the ceramic bearing is further shaped or machined. After forming the ceramic bearing, at least two air inlet ports are formed in the body portion of the bearing in fluid communication with air channels having preferably a spiral pattern formed in at least one flange portion of the bearing.
摘要翻译:制造流体动力陶瓷轴承的方法包括提供包含第一浓度的颗粒状氧化铝和第二浓度的颗粒状氧化锆合金的陶瓷粉末的步骤。 氧化锆合金主要由氧化锆和由MgO,CaO,Y2O3,Sc2O3和稀土氧化物组成的组成。 氧化锆合金的氧化亚氮浓度在Y 2 O 3的情况下为约0.5至约5%(摩尔); 在MgO的情况下,在CeO 2的情况下,约0.1至约1.0摩尔%,在Sc 2 O 3的情况下为约0.5至约15摩尔%,约0.5至约7.0摩尔%,在CaO为约0.5的情况下 至约5摩尔%,相对于氧化锆合金的总量,压实还包括形成坯料。 提供用于接收和加工陶瓷粉末的模具,从而形成陶瓷坯料。 进行陶瓷坯料的成形以形成接近网状的陶瓷轴承。 此后,将近网状陶瓷轴承烧结,得到陶瓷陶瓷轴承。 烧结后,陶瓷轴承进一步成型或加工。 在形成陶瓷轴承之后,至少两个空气入口端口形成在轴承的主体部分中,其中空气通道具有优选地形成在轴承的至少一个凸缘部分中的螺旋图案的空气通道。
摘要:
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.
摘要:
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.
摘要:
A zirconia ceramic having a tetragonal phase crystal grain structure and a process for producing same. The ceramic comprises zirconium oxide and a dopant that is an oxide of a rare earth element, calcium, or magnesium, or mixtures thereof, and the ceramic has a molar ratio of dopant to zirconium oxide in the range of from above about 3:97 to about 5:95 when the ceramic comprises less than about 0.5 mole percent of the oxide of magnesium, the ceramic has a molar ratio of dopant to zirconium oxide in the range of from about 0.5:99.5 to about 1.0:99.0 when the ceramic comprises from about 0.5 mole percent to about 1.0 mole percent of the oxide of magnesium, and the ceramic does not comprise more than about 1.0 mole percent of the oxide of magnesium.
摘要:
An apparatus (10) and method for conveying abrasive web (16), such as photographic media, has a pair of closely spaced rollers (12, 14) through which the abrasive web (16) is conveyed while in contact with a coated media bearing surface (80, 90). The media bearing surface (80, 90) comprising a composite coating or a thin inorganic coating.
摘要:
An apparatus (10) and method for conveying abrasive web (16), such as photographic media, has a pair of closely spaced rollers (12, 14) through which the abrasive web (16) is conveyed while in contact with a coated media bearing surface (80, 90). The media bearing surface (80, 90) comprising a composite coating or a thin inorganic coating.
摘要:
An improved materials feeder equipment includes highly efficient, durable, and wear and abrasion resistant sliding contact elements. In particular, the equipment has a feeder box and a ware plate arranged for sliding contact, each having high precision tetragonal zirconia polycrystal (TZP) ceramic or, alternatively, zirconia-alumina composite.
摘要:
An apparatus (10) for conveying abrasive web (16) of indeterminate length, such as photographic media, has first and second closely spaced rollers (12, 14) with at least one of the rollers (12, 14) having a polymeric/inorganic composite media bearing surface (70). The abrasive web or media (16) is disposed between a nip (18) defined by the close spacing between the rollers (12, 14) and is in moving contact with the polymeric/inorganic composite media bearing surface (70) while being conveyed through the nip (18).
摘要:
A method of making micro-actuator devices including a silicon wafer, a magnet positioned inside an insulated actuating chamber having electrical coil wound around its circumference thereby forming an electromagnet assemblage. A plurality of etched holes in silicon wafer receives the electromagnet assemblage and is adapted to produce a magnetic field in response to an applied current that acts on the magnet to cause the axial reciprocating motion of the magnet.