Abstract:
Metal and ceramic particles of various morphologies are clad with a coating from the transition metal group consisting of silver, gold, copper, nickel, iron, cobalt, aluminum etc., or combinations thereof, to provide improved coated particles for microelectronics or metal matrix composites or other uses. Refractory metal precursor core particles, such as tungsten, molybdenum, niobium and zirconium, as examples, are provided from a composite of tungsten and copper, for example, made by pressurizing and infiltrating or liquid phase sintering of molten copper into a porous tungsten skeleton. Precursor chip particles derived from a tungsten impregnated billet are used as starter particles which may be further enhanced by cogrinding in an attritor ball mill with smaller copper particles to thereby produce an enhanced copper clad-coating of tungsten particles with predetermined percent by weight of copper and tungsten content. The resulting particles exhibit improved electrical and thermal expansion coefficient matching properties for use on microelectronic ceramic substrates and when used for metal matrix composition, provides more uniform distribution of the dispersed strengthening particulate phase in the matrix. In another embodiment, ceramic particles are clad-coated with selected metals so that they can be used in ceramic-metal matrices, thereby producing systems wherein the components are uniformily didpersed throughout the system.
Abstract:
Metal and ceramic particles of various morphologies are clad with a coating from the transistion metal group consisting of silver, gold, copper, nickel, iron, cobalt, aluminum etc., or combinations thereof, to provide improved coated particles for microelectronics or metal matrix composites or other uses. Refractory metal precursor core particles, such as tungsten, molybdenum, niobium and zirconium, as examples, are provided from a composite of tungsten and copper, for example, made by pressurizing and infiltrating or liquid phase sintering of molten copper into a porous tungsten skeleton. Precursor chip particles derived from a tungsten impregnated billet are used as starter particles which may be further enhanced by cogrinding in an attritor ball mill with smaller copper particles to thereby produce an enhanced copper clad-coating of tungsten particles with predetermined percent by weight of copper and tungsten content. The resulting particles exhibit improved electrical and thermal expansion coefficient matching properties for use on microelectronic ceramic substrates and when used for metal matrix composites, provides more uniform distribution of the dispersed strengthening particulate phase in the matrix. In another embodiment, ceramic particles are clad-coated with selected metals so that they can be used in ceramic-metal matrices, thereby producing systems wherein the components are uniformly dispersed throughout the system.
Abstract:
An optical device and method is disclosed for forming the optical device within the wide-bandgap semiconductor substrate. The optical device is formed by directing a thermal energy beam onto a selected portion of the wide-bandgap semiconductor substrate for changing an optical property of the selected portion to form the optical device in the wide-bandgap semiconductor substrate. The thermal energy beam defines the optical and physical properties of the optical device. The optical device may take the form of an electro-optical device with the addition of electrodes located on the wide-bandgap semiconductor substrate in proximity to the optical device for changing the optical property of the optical device upon a change of a voltage applied to the optional electrodes. The invention is also incorporated into a method of using the optical device for remotely sensing temperature, pressure and/or chemical composition.
Abstract:
A solid state energy conversion device and method of making is disclosed for converting energy between electromagnetic and electrical energy. The solid state energy conversion device comprises a wide bandgap semiconductor material having a first doped region. A thermal energy beam is directed onto the first doped region of the wide bandgap semiconductor material in the presence of a doping gas for converting a portion of the first doped region into a second doped region in the wide bandgap semiconductor material. A first and a second Ohmic contact are applied to the first and the second doped regions of the wide bandgap semiconductor material. In one embodiment, the solid state energy conversion device operates as a light emitting device to produce electromagnetic radiation upon the application of electrical power to the first and second Ohmic contacts. In another embodiment, the solid state energy conversion device operates as a photovoltaic device to produce electrical power between the first and second Ohmic contacts upon the application of electromagnetic radiation.
Abstract:
A solid state energy conversion device and method of making is disclosed for converting energy between electromagnetic and electrical energy. The solid state energy conversion device comprises a wide bandgap semiconductor material having a first doped region. A thermal energy beam is directed onto the first doped region of the wide bandgap semiconductor material in the presence of a doping gas for converting a portion of the first doped region into a second doped region in the wide bandgap semiconductor material. A first and a second Ohmic contact are applied to the first and the second doped regions of the wide bandgap semiconductor material. In one embodiment, the solid state energy conversion device operates as a light emitting device to produce electromagnetic radiation upon the application of electrical power to the first and second Ohmic contacts. In another embodiment, the solid state energy conversion device operates as a photovoltaic device to produce electrical power between the first and second Ohmic contacts upon the application of electromagnetic radiation.
Abstract:
A solid-state energy conversion device and method of making is disclosed wherein the solid-state energy conversion device is formed through the conversion of an insulating material. In one embodiment, the solid-state energy conversion device operates as a photovoltaic device to provide an output of electrical energy upon an input of electromagnetic radiation. In another embodiment, the solid-state energy conversion device operates as a light emitting device to provide an output of electromagnetic radiation upon an input of electrical energy. In one example, the photovoltaic device is combined with a solar liquid heater for heating a liquid. In another example, the photovoltaic device is combined with a solar liquid heater for treating water.
Abstract:
A method is disclosed for forming a layer of a wide bandgap material in a non-wide bandgap material. The method comprises providing a substrate of a non-wide bandgap material and converting a layer of the non-wide bandgap material into a layer of a wide bandgap material. An improved component such as wide bandgap semiconductor device may be formed within the wide bandgap material through a further conversion process.
Abstract:
A process is disclosed for in-situ fabricating a semiconductor component imbedded in a substrate. A substrate is ablated with a first laser beam to form a void therein. A first conductive element is formed in the void of the substrate with a second laser beam. A semiconductor material is deposited upon the first conductive element with a third laser beam operating in the presence of a depositing atmosphere. A second conductive element is formed on the first semiconductor material with a fourth laser beam. The process may be used for fabricating a Schottky barrier diode or a junction field effect transistor and the like.
Abstract:
A method is disclosed for making a nano-size semiconductor component within a wide-bandgap semiconductor substrate. A first thermal energy beam is directed onto a first portion of the wide-bandgap semiconductor substrate to change the structure of the wide-bandgap semiconductor substrate into a first element of the semiconductor component. A second thermal energy beam is directed onto a second portion of the wide-bandgap semiconductor substrate adjacent to the first portion to form a second element of the semiconductor component.
Abstract:
An apparatus and process for making a capacitor comprising a first capacitor plate element covered with a spacing material selected for forming a capacitor dielectric. The first capacitor plate element and the spacing material is encased with a second capacitor element. The second capacitor plate element is drawn for reducing the outer diameter thereof. A multiplicity of the capacitor elements are inserted within a second capacitor plate connector. The second capacitor plate connector is drawn for reducing the outer diameter of the metallic tube and for electrically interconnecting the multiplicity of the second capacitor plate elements with the second capacitor plate connector to form a second capacitor plate. The multiplicity of the first capacitor elements are interconnected with a first capacitor plate connector to form a first capacitor plate. The spacing material is replaced with a dielectric material to form the capacitor thereby.