摘要:
A method and apparatus for the polishing of diamond surfaces, wherein the diamond surface is subjected to plasma-enhanced chemical etching using an atomic oxygen polishing plasma source, are disclosed. In the apparatus, a magnetic filter passes a plume of high-density, low-energy, atomic oxygen plasma. The plasma is capable of uniformly polishing diamond surfaces.
摘要:
Method and apparatus are provided for testing parts and materials in a controlled environment, especially an atomic oxygen environment. The apparatus includes a housing which has sample station located in its interior to receive a test sample. A contact element contacts a surface of the test sample, and a drive reciprocates the contact element so that the surface is subjected to wear along a wear path. At least one testing fluid is introduced and removed from the interior with the locations of introduction on removal preferably being such that the testing fluid flows across the test sample. The drive may be a carriage operated through the housing sidewall by a ferromagnetic coupling, and the sample station may be a turntable rotated by a ferromagnetic coupling. A second sample station may be included so that different wear path configurations are possible. The method includes the steps of placing a test sample on a sample support station, contacting the test sample with a contact element, isolating the interior of the housing from the ambient environment, introducing and removing at least one testing fluid at locations such that the testing fluid flows across the test sample, reciprocally moving the contact element on the test sample and measuring an amount of wear after a selected interval of time. Preferably, the test sample is rotated during reciprocation of the contact element. Temperature and pressure may be monitored and controlled.
摘要:
The present disclosure relates to an amorphous aluminum alloy coating. The aluminum alloy coating may specifically include one of cerium, cobalt and/or molybdenum as alloying elements and be applied by a physical vapor deposition process to a desired thickness. The coating may supply improved corrosion resistance to a given environmental condition.
摘要:
The present disclosure relates to an apparatus and method for depositing coatings on the surface of a workpiece with sputtering material in an ion plasma environment. The apparatus may include a magnetron including a core cooling system surrounded by a magnet assembly and target material having a surface capable of providing a source of sputtering material. An RF plasma generation assembly is also provided in the apparatus including an RF antenna capable of providing an RF plasma and drawing ions to one or both of the workpiece surface and target material surface.
摘要:
The present disclosure relates to a method for plasma ion deposition and coating formation. A vacuum chamber may be supplied, wherein the vacuum chamber is formed by a hollow substrate having a length, diameter and interior surface. A plasma may be formed within the chamber while applying a negative bias to the hollow substrate to draw ions from the plasma to the interior surface of the hollow substrate to deposit ions onto the interior surface and forming a coating. The coating may have a Vickers Hardness Number (Hv) of at least 500.
摘要:
The invention relates to carbon nanotube arrays and methods for the preparation and modification of carbon nanotube arrays. The method includes synthesizing a plurality of carbon nanotubes on a substrate such that the carbon nanotubes are substantially vertically aligned and exposing the array to a plasma to change the topography of the array, change the structure or chemical nature of the individual nanotubes, remove at least a portion of the carbon nanotubes, and/or removing nanotubes to expose monodispserse groupings of nanotubes.
摘要:
Tubular structures having aspect ratios of at least about 3 and comprising interior surfaces comprising substantially uniform coatings generated from a gaseous precursor material.
摘要:
A method for depositing a coating on an interior surface of a hollowed workpiece. The method comprises providing the hollowed workpiece in a vacuum chamber, the hollowed workpiece comprising an interior surface substantially defining a bore having a longitudinal axis; positioning a magnetron within thed bore along substantially the length of said longitudinal axis and substantially radially equidistant from the interior surface, said magnetron comprising an external sputter target material; and, generating a circumferential magnetic field about the sputter target material for a time and under sputter deposition conditions effective to produce an interior surface comprising a substantially uniform coating comprising said sputter target material.
摘要:
A coated substrate including a substrate having a surface, a bond coat proximate to the substrate surface, a yttrium stabilized zirconia (YSZ) thermal barrier layer opposite the substrate surface, and at least one interlayer disposed between the bond coat and the thermal barrier layer, wherein the interlayer contains an alloy having a nanocrystalline grain structure. A method for coating a substrate to be exposed to high in service temperatures and/or temperature cycles including depositing a bond coating on substrate surface, depositing at least one nanocrystalline interlayer on the bond coat opposite the substrate surface, and depositing a yttrium stabilized zirconia (YSZ) thermal barrier coating on the nanocrystalline interlayer opposite the bond coat, wherein the service life of the YSZ thermal barrier coating is extended relative to a substrate coated with the bond coating and the thermal barrier without the interlayer disposed therebetween.
摘要:
A coated substrate and a method of forming a diffusion barrier coating system between a substrate and a MCrAl coating, including a diffusion barrier coating deposited onto at least a portion of a substrate surface, wherein the diffusion barrier coating comprises a nitride, oxide or carbide of one or more transition metals and/or metalloids and a MCrAl coating, wherein M includes a transition metal or a metalloid, deposited on at least a portion of the diffusion barrier coating, wherein the diffusion barrier coating restricts the inward diffusion of aluminum of the MCrAl coating into the substrate.