Abstract:
PROBLEM TO BE SOLVED: To provide a protective coating which has satisfactory heat resistance and long term stability against corrosion and oxidation, and is further suited to mechanical stress forecast in a gas turbine at high temperatures in particular. SOLUTION: The protective coating consists of, by weight, 0.5 to 2% rhenium, 15 to 21% chromium, 9 to 11.5% aluminum, 0.05 to 0.7% yttrium and/or at least one equivalent metal selected from the group consisting of scandium and rare earth elements, and 0 to 1% ruthenium, and the balance cobalt and/or nickel with impurities derived from production. The alloy does not produce precipitates of chromium/rhenium, and exhibits no embrittlement by brittle phases caused by the precipitates. COPYRIGHT: (C)2003,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide a protective coating material having both excellent corrosion resistance and mechanical properties and being applicable even to a gas turbine whose inlet temperature is more than 1,200°C for example. SOLUTION: The protective coating is composed of 26-30% nickel, 20-28% chromium, 8-12% aluminum, 0.1-3% reactive elements of at least one kind of rare earth elements and the balance cobalt expressed in terms of weight percent. The material has excellent mechanical properties and also excellent corrosion resistance and exhibits 2.5 times life of a conventional coating on an oxidation test. COPYRIGHT: (C)2004,JPO&NCIPI
Abstract:
The invention relates to a compound with the nominal chemical composition Al w Co x M y wherein M represents at least one of the elements selected from the group Ni, Cr, and at least 30 mass percent of the compound is a quasicrystalline structure or similar. The invention is characterised in that 70 = w = 76 and w + x + y = 100.
Abstract translation:本发明涉及名义原子组成的化合物:铝瓦特 SUB>钴 X SUB>中号ý SUB>其中,M是选自镍,铬中选择的元素中的至少一个 并且该化合物作为准晶结构或作为Approximat,其特征在于,70 = W = + X + Y = 76和W 1/100本至少30质量%
Abstract:
NiCoCrAl layers for use as anticorrosive layers are known from the prior art. Corrosion stability is not only determined by the composition and the percentage of the main alloy elements of nickel, cobalt, chromium and aluminium, but also by the addition of corrosion stability enhancing agents, such as e.g. yttrium. The invention is characterized by additional corrosion stability enhancing agents that substantially improve the anticorrosive properties.
Abstract:
Protective layers, according to the prior art, achieve their protective function by depletion of a defined element that forms a protective oxide layer or that is exhausted as a sacrificial material. Once said material is exhausted, the protective function cannot be maintained. The invention is characterized by using particles (1) that contain a sustained-release depot of the exhaustible material. For this purpose, the material is present in a superstoichiometric form.
Abstract:
Known protective coatings having a high Cr content, as well as silicon, have brittle phases that become additionally brittle under the influence of carbon during use. The protective coating according to the invention has the composition of 24% to 26% cobalt (Co), 10% to 12% aluminum (Al), 0.2% to 0.5% yttrium (Y), 12% to 14% chromium (Cr), and the remainder nickel.
Abstract:
Ceramic thermal barrier coatings according to the state of the art often do not withstand the thermal and mechanical stresses . The inventive ceramic thermal barrier coating (10) comprises two ceramic thermal barrier layers (11, 13) with a different porosity, in which even the inner ceramic thermal barrier layer (11) has a high porosity.
Abstract:
Previous electrolytes are not necessarily suitable for deposition of an alloy. The inventive electrolyte comprises at least one element dissolved therein, representing the matrix material of the alloy that is to be deposited. Other alloy components are contained as a powder in a dispersed manner in the electrolyte.
Abstract:
Known protective layers having a high Cr content, as well as silicon, have brittle phases that become additionally brittle under the influence of carbon during use. The protective layer according to the invention has the composition of 31% to 35% cobalt (Co), 10% to 13% aluminum (Al), 0.1% to 0.7% yttrium (Y), and/or at least one equivalent metal from the group comprising scandium and the rare earth elements, 31% to 35% chromium (Cr), 0.1% to 0.5% silicon, and the remainder nickel.