摘要:
The present disclosure relates to methods and systems for reducing silica recession of silicon-containing ceramics or silicon-containing ceramic composites, particularly those exposed to a combustion gas or to combustion gas environments, including those exposed to high temperature combustion gas environments. The methods and systems involve silicon-doping of compressed air and/or removal of moisture from compressed air prior to co-mingling the treated compressed air with the combustion gas to which the silicon- containing ceramics or silicon-containing ceramic composites are exposed.
摘要:
A ceramic foam filter and method of making the filter is described. The filter comprises: a sintered reaction product of: 35-75 wt% aluminosilicate; 10-30 wt% colloidal silica; 0-2 wt% bentonite; and 0-35 wt% fused silica; wherein the ceramic foam filter has less than 0.15 wt% alkali metals measured as the oxide and a flexural strength of at least 60 psi measured at 4 minutes at 1428°C.
摘要翻译:公开了一种用于生产廉价的Mg 2 Si 1-x Sn x多晶体的生产设备和方法,其可以有效地用于可以根据需要通过掺杂而具有高性能指标的热电转换材料。 具体公开了一种用于Mg2Si1-xSnx的制造装置(1),其特征在于,至少包含用于通过填充反应容器来合成由式(1)表示的Mg 2 Si 1-x Sn x多晶体(12)的反应容器(3) 颗粒和Si颗粒或Mg颗粒和Sn颗粒或Mg-Si合金颗粒或Mg-Sn合金颗粒作为主要原料(2); 设置在填充反应容器(3)并且具有透气性的原料(2)的上方的无机纤维层(6),并且在多晶体(12)的合成期间具有气化的Mg的化学反应 和氧气,并且其中所述无机纤维层(6)的气体渗透性可以被产生的产物(7)熄灭; 加热反应容器(3)的加热装置(8); 以及用于控制反应容器(3)的加热温度和加热时间的控制装置(9)。 Mg2Si1-xSnx ...(1)[式(1)中,x为0-1]
摘要:
A component comprising a silicon-based substrate and a braze-based protective coating disposed on the silicon-based substrate. The braze-based coating comprises a brazed layer, wherein the brazed layer comprises at least one intermetallic compound. A scale layer may be formed on the brazed layer. An environmental barrier coating may be disposed directly on the brazed layer or directly on the scale layer. A thermal barrier coating may be disposed on the environmental barrier coating. Methods for making a Si-based component having a braze-based protective coating are also disclosed.
摘要:
In devices used for the direct conversion of heat into electricity, or vice versa, known in the art as thermoelectric power generators, thermoelectric refrigerators and thermoelectric heat pumps, the efficiency of energy conversion and/or coefficient of performance have been considerably lower than those of conventional reciprocating or rotary, heat engines and/or vapor-compression systems, employing certain refrigerants. The energy conversion efficiency of power generating devices, for example, aside from the hot and cold junction temperatures, also depends on a parameter known in the art as the thermoelectric figure of merit Z=S sigma/k, where S is the thermoelectric power, sigma is the electrical conductivity and k is the thermal conductivity, of the material that constitutes the p-type, and/or n-type, thermoelements, or branches, of the said devices. In order to achieve a considerable increase in the energy conversion efficiency, a thermoelectric figure of merit of the order of 10 K , or more, is needed. It is reasonably expected that such an order of magnitude, for the figure of merit, can be realized with a composition of matter, comprising magnesium, silicon, lead and barium, and optionally comprising one, or more, additional doping materials.
摘要翻译:在用于将热量直接转换成电的装置中,或反之亦然(本领域已知的热电发电机,热电冰箱和热电热泵),能量转换效率和/或性能系数已经明显低于 常规往复式或旋转式,热力发动机和/或蒸汽压缩系统,采用某些制冷剂。 发电装置的能量转换效率,例如除了冷热结温之外,还取决于本领域已知的参数作为热电品质因数Z = S 2 sigma / k的参数,其中S是 热电功率,σ是构成所述器件的p型和/或n型,热电子元件或分支的材料的电导率,k是热导率。 为了实现能量转换效率的显着提高,需要大约10 -2 K -1以上的热电特性值。 合理预期,可以通过包含镁,硅,铅和钡的物质组成并且任选地包含一种或多种另外的掺杂材料来实现品质因数的这样一个数量级。
摘要:
In devices used for the direct conversion of heat into electricity, or vice versa, known in the art as thermoelectric power generators, thermoelectric refrigerators and thermoelectric heat pumps, the efficiency of energy conversion and/or coefficient of performance have been considerably lower than those of conventional reciprocating or rotary, heat engines and/or vapor-compression systems, employing certain refrigerants. The energy conversion efficiency of power generating devices, for example, aside from the hot and cold junction temperatures, also depends on a parameter known in the art as the thermoelectric figure of merit Z=S 2 σ/k, where S is the thermoelectric power, σ is the electrical conductivity and k is the thermal conductivity, of the material that constitutes the p-type, and/or n-type, thermoelements, or branches, of the said devices. In order to achieve a considerable increase in the energy conversion efficiency, a thermoelectric figure of merit of the order of 10 -2 K -1 , or more, is needed. It is reasonably expected that such an order of magnitude, for the figure of merit, can be realized with a composition of matter, comprising magnesium, silicon, lead and barium, and optionally comprising one, or more, additional doping materials.
摘要翻译:在用于将热直接转换为电或者反之亦然的装置中,在本领域中称为热电发电机,热电冰箱和热电热泵,能量转换的效率和/或系数 性能比使用某些制冷剂的常规往复式或旋转式,热机和/或蒸气压缩系统的性能低得多。 例如,除了热结点和冷结点之外,发电设备的能量转换效率还取决于本领域中已知的参数,即热电品质因数Z = S 2 /σ/ k 其中S是热电功率,σ是构成所述器件的p型和/或n型热电元件或分支的材料的电导率和k是热导率。 为了实现能量转换效率的显着提高,需要热电品质因数为10 -2 -2 K -1或更多。 可以合理地预期,对于品质因数,这种数量级可以用包含镁,硅,铅和钡的物质组成来实现,并且可选地包含一种或多种额外的掺杂材料。 p >
摘要:
A silicide-based composite material is disclosed, comprising a silicide of Mo, B, W, Nb, Ta, Ti, Cr, Co, Y, or a combination thereof, Si 3 N 4 , and at least an oxide, as well as and a process for producing the same.
摘要翻译:公开了一种硅化物复合材料,其包括Mo,B,W,Nb,Ta,Ti,Cr,Co,Y或其组合的硅化物,Si 3 N 4和至少一种氧化物,以及工艺 为了生产相同。
摘要:
New silicon-metal silicide products and methods of making the same are disclosed. The silicon-metal silicide products may include a silicon-containing comprising a plurality of crystallite silicides. The product may have a specific surface area of at least 1 m 2 /gram, and the plurality of crystallite silicides may have an average crystallite size of from 5 nanometers to 500 nanometers. The product may have pores with an average pore size of from about 2 nm to 1 um. The silicon-metal silicide products may be made by contacting a porous precursor product with a magnesium-containing material. The porous precursor product includes a silicon material having some Si-O bonds and metal in contact with the porous precursor product. During the contacting, the magnesium-containing material may reduce the silicon, and metal silicides may form from the metal.