摘要:
In one embodiment a tin oxide based electrode is disclosed. The tin oxide-based electrode includes a base material of tin oxide, a resistivity modifier, a sintering aid, and a corrosion inhibitor. The corrosion inhibitor forms a solid solution with the base material and has a melting point not less than about 1700° C. and a partial pressure of not greater than about 1.0E-7 atmospheres at 1500° C. The corrosion inhibitor further includes 0-4.0 wt % ZrO2 based on the total weight of the composition.
摘要:
A ceramic composite and method of making are provided. The ceramic composite may be transparent and may serve as transparent armor. The ceramic portion of the composite may be single crystal sapphire. The composite may provide adequate protection from projectiles while exhibiting large surface areas and relatively low areal densities.
摘要:
A method of forming a shaped article includes forming a mixture which includes a titania hydrate pulp having a loss on ignition of from about 10 to 45 wt.%, a seed material comprising a titanium oxide, at least a portion of the titanium oxide being in a rutile form, and optionally a dispersion aid. The method includes forming the mixture into a shaped article and firing the shaped article. A shaped article suitable for use as a catalyst carrier is at least 90% titanium oxide, greater than 80% of the titanium oxide being in the rutile phase. The article has a surface area of at least 2.5 m2/g and a mercury pore volume of greater than 0.15 cc/g.
摘要:
A system for treatment of one or more flowing materials includes a support bed (32) comprising a plurality of support elements (34). The support bed may have a void fraction of at least 45%. An active bed (36), such as a bed of catalytic elements, may be supported by the support bed. The void fraction of the support bed may be larger than that of an equivalent bed of conventional, spherical elements, enabling significant improvements in the flow rate of reactants through the bed and/or a reduced pressure drop across the support bed.
摘要:
A method of forming a carrier material suited to use in Fischer-Tropsch reactions includes forming a dispersion of first and second hydrated alumina materials in a liquid dispersant, such as an acid solution. The first alumina can be derived from an alkali aluminate, such as is formed in the Bayer reaction. The second hydrated alumina can be derived from high purity aluminum, such as via conversion to an alkoxide. The dispersion is spray dried to form particles which are heat treated to form a carrier material having low levels of impurities.
摘要:
A single crystal spinel wafer is disclosed, including a front face and a back face; and an outer periphery having first and second flats. In certain embodiments, the single crystal wafer has a specific crystallographic orientation, and the flats are provided to extend along desired plane sets. The flats may advantageously identify orientation of cleavage planes, and direction of cleavage of cleavage planes.
摘要:
The disclosure is directed to a solid oxide fuel cell including an electrolyte. The electrolyte is formed using a fused electrolyte powder. The disclosure is also directed to a solid oxide fuel cell stack including a plurality of solid oxide fuel cells. Each solid oxide fuel cell of the plurality of solid oxide fuel cells includes an electrolyte. The electrolyte is formed using a fused electrolyte powder.
摘要:
A ceramic component is disclosed, including a sintered ceramic body formed from a composition comprising a first ceramic material, and a plurality of inclusions in the ceramic body, each inclusion comprising graphite and a second ceramic material.
摘要:
A ceramic component is provided, including a ceramic body containing silicon carbide, and an oxidelayer provided on the ceramic body, the oxide layer containing a crystalline phase having anisotropically-shaped crystals comprising at least one of the alumina and an aluminosilicate.
摘要:
Improved outgassing techniques for decreasing oxygen and water concentrations in an annealing furnace, with the result being a significant reduction if not elimination of crystal defects. At the beginning of an annealing process, an airtight chamber of the annealing furnace is evacuated and filled with an inert gas not only one time but multiple times. During the anneal, inert gas, with or without a fluorinating agent, is flowed through the chamber during the heating and cooling steps while the oxygen and water concentrations in the flowing gas are each maintained below 5 ppm and more preferably below 1 ppm.