摘要:
An aneutronic magnetron energy generator that generates microwave energy from a fusion-fission reaction that produces alpha particles in response to a proton colliding with an 11B nucleus. The magnetron energy generator includes a magnetron having an anode resonator including a central chamber and a plurality of radially disposed cavities. A cathode assembly is provided at the center of the chamber and includes a cathode electrode that generates a proton plasma. A series of electrically isolated acceleration rings extend from the cathode electrode and operate to accelerate protons from the proton plasma towards an outer target ring composed of boron eleven (11B). The accelerated protons fuse with the 11B nuclei to generate the alpha particles that then interact with crossed electric and magnetic fields between the target ring and the cavities. The alpha particles resonate with the cavities and generate a current within the resonator that is collected.
摘要:
An electronic intelligent indenter system that determines the hardness and the case depth of a hardened portion of a test part in a non-destructive manner. The system employs an electronic indenter tool having a tip. To determine the depth of the case hardened portion of the part, the indenter tip is placed in contact with the surface of the part, and a laser emits a laser beam pulse that impinges the surface of the part proximate the tip. The laser beam generates ultrasonic waves that propagate into the part. The ultrasonic waves reflect off of a transition between the case hardened portion and an unhardened portion of the part. A detector in the indenter system detects the reflected ultrasonic waves. The ultrasonic waves cause the detector to generate a signal identifying the time between when the laser pulse is emitted and when the reflected wave is received. The signal is analyzed by a controller that compares the signal to a standard of calibration for a reflected wave from a hardened portion of a calibration part having a greater depth than the test part.
摘要:
A method is provided for improving the scratch or surface wear resistance of substrates by embedding discrete, hard particles within the surface layer of the substrate. Discrete, hard particles are applied to the substrate surface and then embedded within and bonded to the surface layer of the substrate by softening the substrate surface layer by either thermal or solvent means. Suitable substrate materials include thermoplastics, thermoset plastics, polymers, glass, soft metals, and composites. Suitable hard particles include diamond, silicon dioxide, aluminum oxide, cubic boron nitride, boron carbide, silicon carbide, silicon nitride, tantalum carbide, titanium carbide, titanium nitride, tungsten carbide, and zirconia alloys containing at least one phase stabilization additive selected from the group yttrium, hafnium, calcium, magnesium, and cesium. Scratch resistant substrates or articles having discrete, hard particles embedded within the surface layer of the substrate or article are also provided. These substrates or articles essentially have the surface wear characteristics of the hard particles or material embedded within the surface layer. Thus, it is possible to prepare plastic materials or articles having significantly improved scratch or surface wear resistance without significantly increasing the weight or external dimensions of the plastic materials or articles.
摘要:
Shaped synthetic articles are fabricated by vapor deposition of synthetic diamond on releasable molds. A process is also provided for forming a shaped synthetic diamond article by coating a mold with an etchable layer and then depositing synthetic diamond on the etchable layer. The etchable layer is thereafter removed in an etchant bath, releasing the diamond article from the mold. The synthetic diamond articles are useful as high-temperature, corrosion resistant vessels and as wear surfaces.
摘要:
A composite susceptor for forming uniform deposits by chemical vapor deposition. The composite susceptor has an electrically conducted layer of material disposed on a block of material which is adapted to be heated by an induction heating coil. The conductive layer is electrically biased to control the geometry of the gas plasma. By electrically controlling the geometry of the gas plasma, more uniform deposition of a material on a substance is achieved. A composite susceptor having a segmented conductive layer for producing a graded electrical profile and a conductive ring surrounding a gas plasma are also described. In one aspect, a phase-shifting layer of material is disposed on the conductive layer.
摘要:
An electro-optical communication device which includes a light transmissive conduit integrally formed to interconnect a light emitter and a light detector. The length over which the light transmissive conduit extends is substantially greater than the size of either the light emitter or the light detector. In the preferred embodiment, the light emitter and the light detector are each formed from amorphous semiconductor alloy material and may be substantially surrounded by the light transmissive conduit.
摘要:
A cold cathode is formed of carbon nitride. The cathode may include layers of boron nitride and diamond underlying the carbon nitride. The cathodes are made by reactive laser ablation or by sputtering. Electronic devices utilizing the carbon nitride cathodes are also described.
摘要:
A cold cathode is formed of n-type boron nitride. The cathode may include a layer of diamond underlying the boron nitride. The cathodes are made by laser ablation or by sputtering. Electronic devices utilizing the boron nitride cathodes are also described.
摘要:
A novel method of forming large area single crystal cubic boron nitride films on a silicon substrate by first treating the surface of the substrate with atomic hydrogen and then depositing a cubic boron nitride film by a reactive biased laser ablation technique.
摘要:
A method of stabilizing the switching characteristics of a thin film chalcogenide glass material by subjecting said material to a hydrogenated atmosphere, preferably activated hydrogen and argon. It is also preferred to provide a post hydrogenation anneal step.