摘要:
In a dispersoid-reinforced electrode with a net-like open pore structure and a ceramic and a metallic meshwork, ceramic particles with an average particle diameter of less than 100 nm are homogeneously distributed in the metallic network thereby reinforcing the electrode.
摘要:
The aim of the invention is to produce complete high temperature fuel cells by means of thermal injection processes (e.g. atmospheric plasma injection, vacuum plasma injection, high speed flame injection). The production method is especially simplified and is economical by virtue of the fact that the carrier substrate is also produced on a base with the aid of a thermal injection method. The base or an intermediate layer placed thereon can be advantageously dissolved or decomposed such that the carrier substrate provided with layers arranged thereon can be separated in a very simple manner from the base which becomes unnecessary. Said method advantageously enables the production of all layers of a high temperature fuel cell, exclusively with the aid of a thermal injection method.
摘要:
A heat-insulating material has a melting point above 2500° C., a thermal expansion coefficient in excess of 8×10−6 K−1, and a sintering temperature greater than 1400° C. It has a perovskite structure of the general formula A1+r(B′1/3+xB″2/3+y)O3+z where A=at least one element of the group (Ba, Sr, Ca, Be), B′=at least one element of the group (Mg, Ca, Sr, Ba, Be), B″=at least one element of the group (Ta, Nb), r, x, and z≠0, and −0.1
摘要:
A heat-insulating material has a first phase with the stoichiometric composition of 0.1 to 10 mol-% M12O3, 0.1 to 10 mol-% Li2O, and as the remainder M22O3 with possible impurities. M1 is selected from the elements lanthanum, neodymium, gadolinium, or a mixture thereof, and M2 is selected from the elements aluminum, gallium, iron, or a mixture thereof. The first phase is present in a magnetoplumbite structure.
摘要:
The invention relates to a material, in particular for a thermal insulation layer, with increased thermal stability, a low heat conductivity and a large thermal coefficient of expansion. According to the invention, said material comprises lanthanides, in particular the elements La, Ce, Nd, Yb, Lu, Er or Tm, which preferably occur as a mixture in a Perovskite structure. Said thermal insulation layer is particularly suitable for replacing thermal insulation layers comprising yttrium stabilized zirconium oxides (YSZ) as the thermal stability thereof is given as well over 1200° C.
摘要:
The invention relates to a method for producing a tight crystalline mullite layer on a metallic and/or ceramic substrate by using the plasma spraying technique. To this end, a sol containing mullite precursors with a proportion of 2 to 25% by weight with regard to the oxides (3 Al2O3/2 SiO2) is used as a spraying additive. This method is carried out under atmospheric conditions, and the sol is injected with a focussed jet and with an overpressure of at least one I bar into the plasma flame. An additional compacting of the layer can be advantageously effected by repeatedly passing over the layer with the plasma flame. The method is particularly suited for applying a gas-tight crystalline mullite layer to a steel substrate.
摘要翻译:本发明涉及通过使用等离子喷涂技术在金属和/或陶瓷基板上制造紧密结晶莫来石层的方法。 为此,相对于氧化物(3 Al 2 O 3/2 SiO 2),含有比例为2〜25重量%的莫来石前体的溶胶, 2 SUB>)用作喷雾添加剂。 该方法在大气条件下进行,并且将溶胶注入聚焦射流并且将至少一个I巴的超压注入等离子体火焰中。 可以通过用等离子体火焰重复地穿过层来有利地实现层的另外的压实。 该方法特别适用于向钢基材施加气密结晶莫来石层。
摘要:
Disclosed is a method for producing a coating system on a component, wherein at least one coating is deposited on the component by way of atmospheric plasma spraying (APS) and at least one further coating is deposited by way of suspension plasma spraying (SPS). The coatings are particularly advantageously deposited in the sequence of APS+SPS or APS+SPS+APS or APS+SPS+erosion coating. These sequences of coatings applied in this way usually have an effect providing a first porous coating and a second porous coating disposed thereon, wherein the porosity of the second coating is greater than that of the first coating, and wherein the reflectivity is greater than that of the first coating. The increased reflectivity of the coating, particularly in the visible (VIS) and the near infrared (NIR) wavelength ranges, advantageously causes a lower thermal load for the substrate material because a smaller proportion of thermal radiation penetrates the ceramic thermal barrier coating, resulting in lower heating of the substrate (component).
摘要:
A method produces thermal barrier coatings that adhere to components even at high temperatures and temperatures that change frequently. A gas-tight glass-metal composite coating is applied to the component and annealed. The corroded part of the gas-tight coating is then removed, and a second, porous coating is applied. The second coating can comprise a ceramic, in particular yttrium-stabilized zirconium oxide. A thermal barrier coating is provided that is a composite made of a gas-tight glass-metal composite coating and another porous coating disposed thereover. Because the boundary volume of the composite coating is partly crystallized to the other coating, superior adhesion within the composite is achieved. Thus, it is in particular possible to produce a composite made of silicate glass-metal composite coatings and yttrium-stabilized zirconium oxide that are temperature-stable for extended periods of time. Such a composite is particularly advantageous for use as a thermal barrier coating because it combines good protection against oxidation with low heat conductivity and susceptibility to aging.
摘要:
A method produces thermal barrier coatings that adhere to components even at high temperatures and temperatures that change frequently. A gas-tight glass-metal composite coating is applied to the component and annealed. The corroded part of the gas-tight coating is then removed, and a second, porous coating is applied. The second coating can comprise a ceramic, in particular yttrium-stabilized zirconium oxide. A thermal barrier coating is provided that is a composite made of a gas-tight glass-metal composite coating and another porous coating disposed thereover. Because the boundary volume of the composite coating is partly crystallized to the other coating, superior adhesion within the composite is achieved. Thus, it is in particular possible to produce a composite made of silicate glass-metal composite coatings and yttrium-stabilized zirconium oxide that are temperature-stable for extended periods of time. Such a composite is particularly advantageous for use as a thermal barrier coating because it combines good protection against oxidation with low heat conductivity and susceptibility to aging.
摘要:
A heat-insulating layer has a melting point above 2500° C., a thermal expansion coefficient in excess of 8×10−6 K−1, and a sintering temperature greater than 1400° C. This material has a perovskite structure of the general formula A1+r(B′1/2+xB″1/2+y)O3+z in which: A=at least one element of the group (Ba, Sr, Ca, Be), B′=at least one element of the group (Al, La, Nd, Gd, Er, Lu, Dy, Tb), B″=at least one element of the group (Ta, Nb), and 0.1