摘要:
An environmental barrier coating (10) for a component including silicon that has a first coefficient of thermal expansion is provided. The environmental coating includes a silicon bondcoat (30) that is bonded to at least a portion of an outer surface of the component. An intermediate layer (25, 27, 29) is bonded to the silicon bondcoat and has a second coefficient of thermal expansion matched to the first coefficient of thermal expansion. The intermediate layer has a general composition of RE 2 Si 2 O 7 . A protective layer (36) is bonded to the intermediate layer and has a general composition of RE 2 SiO 5 . A surface layer (38) is bonded to the protective layer. The surface layer includes RE and has a ratio of RE to oxygen of at least 2:3.
摘要:
A thermal barrier coating system (10) includes a thermal barrier coating (18) comprising a compound having a rhombohedral phase. In accordance with an embodiment of the invention, a thermal barrier coating (18) is provided that comprises a compound having the formula of: A 4 B 3 O 12 , wherein A is at least one rare earth element; and B is selected from the group consisting of Zr, Hf and mixtures thereof.
摘要翻译:热障涂层系统(10)包括包含具有菱形相的化合物的热障涂层(18)。 在与本发明的实施方式雅舞蹈,提供了一种热障涂层(18),确实包含具有下式的化合物:甲4 B 3 O 12,worin A是至少一种稀土元素; 且B选自锆,铪以及它们的混合物中选择。
摘要:
In accordance with an embodiment of the invention, an article is provided. The article comprises a substrate (16) comprised of silicon containing material, an environmental barrier coating (EBC) (12) overlying the substrate (16) and a thermal barrier coating (TBC) (14) on the environmental barrier coating (12). The thermal barrier coating (14) comprising a compound having a rhombohedral phase.
摘要:
A thermal barrier coating (TBC) (26) for a component (10) intended for use in a hostile thermal environment. The TBC (26) has an interior region (32) and an outer surface region (34) on and contacting the interior region (32). Both regions (32,34) are formed of a ceramic material, with the interior region (32) having a lower thermal conductivity than zirconia partially stabilized by about seven weight percent yttria. The interior region (32) constitutes more than half of the thickness of the TBC (26), and the outer surface region (34) constitutes less than half of the thickness of the TBC (26). The TBC (26) has a columnar microstructure whereby the interior region (32) and the outer surface region (34) comprise columns (30) of their ceramic materials. The outer surface region (34) is more erosion and impact resistant than the interior region (32) at least in part as a result of the columns (30) thereof being more closely spaced than the columns (30) of the interior region (32).
摘要:
A fuel cell stack (10) includes at least one fuel cell unit (20) and a number of interconnects (22) defining at least two openings (24) and including at least one flow field (34) for flowing a reagent. Each opening defines a respective fuel manifold (25), including at least one each of intake and exhaust fuel manifolds (251, 252). The fuel cell unit includes an anode (26), a cathode (28), and an electrolyte (27) disposed therebetween. The anode is adjacent to and in both electrical connection and fluid communication with one of the interconnects, which has a flow field (34) that guides a fuel flow between the intake and exhaust fuel manifolds. The cathode is adjacent to and in both electrical connection and fluid communication with another interconnect with a flow field (34) that guides an oxidant flow. The fuel cell stack includes a perimeter isolation seal (44) and at least two interior isolation seals (45) for sealing the electrolyte to the respective interconnects.
摘要:
A thermal barrier coating (TBC) system (20) and method for forming the TBC (26) on a component (22,24,28) characterized by a stabilized microstructure that resists grain growth, sintering and pore coarsening or coalescence during high temperature excursions. The TBC (26) contains elemental carbon and/or a carbon-containing gas that increase the amount of porosity (32) initially within the TBC (26) and form additional fine closed porosity (32) within the TBC (26) during subsequent exposures to high temperatures. A first method involves incorporating elemental carbon precipitates by evaporation into the TBC microstructure. A second method is to directly incorporate an insoluble gas, such as a carbon-containing gas, into an as-deposited TBC (26) and then partially sinter the TBC (26) to entrap the gas and produce fine stable porosity within the TBC (26).
摘要:
A system for damping vibrations in a turbine includes a first rotating blade (50) having a first ceramic airfoil (62), a first ceramic platform (72) connected to the first ceramic airfoil (62), and a first root (74) connected to the first ceramic platform (72). A second rotating blade (50) adjacent to the first rotating blade (50) includes a second ceramic airfoil (62), a second ceramic platform (72) connected to the second ceramic airfoil (62), and a second root (74) connected to the second ceramic platform (72). A non-metallic platform damper (78) has a first position in simultaneous contact with the first and second ceramic platforms (72).
摘要:
An environmental barrier coating (10) for a component including silicon that has a first coefficient of thermal expansion is provided. The environmental coating includes a silicon bondcoat (30) that is bonded to at least a portion of an outer surface of the component. An intermediate layer (25, 27, 29) is bonded to the silicon bondcoat and has a second coefficient of thermal expansion matched to the first coefficient of thermal expansion. The intermediate layer has a general composition of RE 2 Si 2 O 7 . A protective layer (36) is bonded to the intermediate layer and has a general composition of RE 2 SiO 5 . A surface layer (38) is bonded to the protective layer. The surface layer includes RE and has a ratio of RE to oxygen of at least 2:3.
摘要:
Disclosed herein is a system 10 including a motor 20 comprising a rotor 30, a stator 40 and a sealing assembly 100 having at least one joint and a monolithic ceramic separator 110. Each joint of the sealing assembly 100 is a chemical bond joint, and the monolithic ceramic separator 110 is disposed in a gap 50 between the rotor 30 and the stator 40 of the motor 20 such that the sealing assembly 100 hermetically isolates the rotor 30 and the stator 40.
摘要:
A thermal barrier coating system (10) includes a thermal barrier coating (18) comprising a compound having a rhombohedral phase. In accordance with an embodiment of the invention, a thermal barrier coating (18) is provided that comprises a compound having the formula of: A 4 B 3 O 12 , wherein A is at least one rare earth element; and B is selected from the group consisting of Zr, Hf and mixtures thereof.