摘要:
Ultraviolet (UV)-curable polyurethane compositions are provided which are made by reacting an isocyanate with an ultraviolet (UV)-curable polyol that is made by co-polymerizing an alkylene oxide, an unsaturated carboxylic acid or anhydride and a hydroxy functional compound and which has an ultra-low level of unsaturation. The inventive ultraviolet (UV)-curable polyurethane compositions may find use in or as coatings, adhesives, sealants, elastomers and the like.
摘要:
Powder coatings having good impact resistance and weatherability characteristics are produced with an isophthalic acid-based polyester and an isocyanate-based curing agent.
摘要:
A method of instrumenting a first component (210) for use in a combustion turbine engine (10) wherein the first component (210) has a surface contacted by a second component during operation of the combustion turbine engine (10). The method may include depositing an insulating layer (260) on the surface of the first component (210) and depositing a first conductive lead (232, 254) on the insulating layer (260). A piezoelectric material (230) may be deposited in electrical communication with the first conductive lead (232, 254) and a second conductive lead (236, 256) may be deposited in electrical communication with the piezoelectric material (230) and be insulated from the first conductive lead (232, 254) to form a sensor (50) for detecting pressure exerted on the surface of the first component (210) during operation of the combustion turbine engine (10).
摘要:
An abradable thermal barrier coating material (10) formed of a highly defective fluorite ceramic matrix (16) having a desired degree of porosity (18) created in part by the addition of a fugitive material (19). The ceramic material has a concentration of a stabilizer sufficiently high that the oxygen vacancies created by the stabilizer interact within the matrix to form multi-vacancies, thereby improving the sintering resistance of the material. Such a concentration of stabilizer results in a material that is softer than prior art materials having lower concentrations of stabilizer, and that will be more resistive to sintering than prior art materials. Embodiments include a fluorite matrix of zirconia stabilized by at least 30 wt. % yttria, or stabilized by at least 30 wt. % ytterbia, and with porosity of 10-40%. In one embodiment, a metallic gas turbine seal ring segment is coated with a bond coat layer, then with a layer of porous 8 wt. % YSZ material, and finally with a layer of 33 mole % YbSZ (61.3 wt. % YbSZ) material having porosity of 10-40%.
摘要:
A device (10) is made, having a ceramic thermal barrier coating layer (16) characterized by a microstructure having gaps (18) with a sintering inhibiting material (22) disposed on the columns (20) within the gaps (18). The sintering resistant material (22) is stable over the range of operating temperatures of the device (10), is not soluble with the underlying ceramic layer (16) and is applied by a process that is not an electron beam physical vapor deposition process. The sintering inhibiting material (22) has a morphology adapted to improve the functionality of the sintering inhibiting material (22), characterized as continuous, nodule, rivulet, grain, crack, flake and combinations thereof and being disposed within at least some of the vertical and horizontal gaps.
摘要:
A device (10) is made, having a ceramic thermal barrier coating layer (16) characterized by a microstructure having gaps (18) with a sintering inhibiting material (22) disposed on the columns (20) within the gaps (18). The sintering resistant material (22) is stable over the range of operating temperatures of the device (10), is not soluble with the underlying ceramic layer (16) and is applied by a process that is not an electron beam physical vapor deposition process.
摘要:
A thermal barrier coating (18) having a less dense bottom layer (20) and a more dense top layer (22) with a plurality of segmentation gaps (28) formed in the top layer to provide thermal strain relief. The top layer may be at least 95% of the theoretical density in order to minimize the densification effect during long term operation, and the bottom layer may be no more than 95% of the theoretical density in order to optimize the thermal insulation and strain tolerance properties of the coating. The gaps are formed by a laser engraving process controlled to limit the size of the surface opening to no more than 50 microns in order to limit the aerodynamic impact of the gaps for combustion turbine applications. The laser engraving process is also controlled to form a generally U-shaped bottom geometry (54) in the gaps in order to minimize the stress concentration effect.
摘要:
A method of forming a cooling feature (28) on a surface (14) of a substrate (12) to protect the substrate from a high temperature environment. The cooling feature is formed by first depositing a layer of a masking material (16) such as epoxy resin on the surface of the substrate. A pattern of voids (18) is then cut into the masking material by a laser engraving process which exposes portions of the substrate surface. A plurality of supports (20) are then formed by electroplating a support material onto the exposed portions of the substrate surface. A layer of material is then electroplated onto the supports and over the masking material to form a skin that interconnects the supports. Finally, the remaining portions of the masking material are removed to form a plurality of cooling channels (26) defined by the supports, skin and substrate surface. An additional layer of material (42) may be deposited onto a top surface (50) of the cooling feature to provide additional thermal and/or mechanical protection.
摘要:
A turbine component (10), such as a turbine blade, is provided which is made of a metal alloy (22) and a base columnar thermal barrier coating (20) on the alloy surface, where a heat resistant ceramic oxide sheath material (32′ or 34′) covers the columns (28), and the sheath material is the reaction product of a precursor ceramic oxide sheath material and the base thermal barrier coating material.
摘要:
Aqueous polyurethane coating compositions are disclosed in this specification. The aqueous polyurethane coating compositions contain a polycarbonate-polyurethane resin component and a water-dilutable, ethylenically unsaturated polyurethane polyol component.