摘要:
Ceramic layers are often used for heat insulation in a layer system, and have a high porosity therefore, The inventive porous ceramic heat insulating layer has a particular pore size distribution such that it has a high expansion tolerance event at temperatures higher than 1200° C.
摘要:
An oxidation resistant component is disclosed comprising a substrate and a protective layer. The protective layer consists of an inner MCrAlY layer contiguous with the substrate and an outer layer consisting of at least Ni and Al and having a β-NiAl structure.
摘要:
MCrAl layers according to prior art often display chipping of the thermally grown aluminum oxide layer (TGO) as a result of thermally induced stresses, which significantly reduces the oxidation behavior or the bonding behavior of ceramic heat insulating layers. An inventive MCrAl layer is designed in such a way that the TGO created thereon is microporous and thus allows expansion. The microporosity of the TGO is ensured by adding elements into the MCrAl layer in a targeted manner.
摘要:
Protective layers of the MCrAlX type according to the prior art are often provided with a platinum layer to prevent diffusion of elements out of the base material into the MCrAlX. The MCrAlX alloy according to the invention includes halogens (F, Cl, Br, I), which prevent this diffusion, in particular of titanium.
摘要:
The invention relates to a method for removing at least one layer area of a component made of metal or a metal compound. When components are used in high temperature areas, they acquire degraded areas which are removed by means of an acid attack. Removal during said acid treatment is uneven since areas having different acidic solubility behavior arise as a result of said degradation. According to the inventive method, the chemical composition and the phase composition of the component can be altered in such a matter that an even removal can take place during the acid treatment.
摘要:
Protective coatings known in the state of art can reveal either good corrosion resistance or good mechanical properties.An inventive protective coating resistant to corrosion at medium and high temperatures essentially consisting of the following elements (in percent by weight): 26 to 30% nickel, 20 to 28% chromium, 8 to 12% aluminium, 0.1 to 3% of at least one reactive element of the rare earths, cobalt balanced, reveals good corrosion resistance combined with good mechanical properties.
摘要:
MCrAl layers according to prior art often display chipping of the thermally grown aluminum oxide layer (TGO) as a result of thermally induced stresses, which significantly reduces the oxidation behavior or the bonding behavior of ceramic heat insulating layers. An inventive MCrAl layer is designed in such a way that the TGO created thereon is microporous and thus allows expansion. The microporosity of the TGO is ensured by adding elements into the MCrAl layer in a targeted manner.
摘要:
A metallic coating or alloy is provided. The metallic coating includes iron, cobalt, chromium, and aluminum. Tantalum may also be included. A new addition in nickel based coating with stabilized gamma/gamma′ phases at high temperatures lead to a reduction of local stresses. A component including the metallic coating or alloy is also provided.
摘要:
Known protective layers having high Cr content and additional silicon form brittle phases, which additionally become brittle under the effect of carbon during use. The protective layer according to the invention comprises a two-part metal layer, which contains tantalum on the outside.
摘要:
Known protective layers having a high Cr-content and a silicone in addition, form brittle phases that embrittle further under the influence of carbon during use. The protective layer according to the invention is composed of 22% to 26% cobalt (Co), 10.5% to 12% aluminum (Al), 0.2% to 0.4% Yttrium (Y) and/or at least one equivalent metal from the group comprising Scandium and the rare earth elements, 15% to 16% chrome (Cr), optionally 0.3% to 1.5% tantal, the remainder nickel (Ni).