摘要:
Ceramic materials with relatively high resistance to wetting by various liquids, such as water, are presented, along with articles made with these materials. The oxide materials described herein as a class typically contain one or more of ytterbia (Yb2O3) and europia (Eu2O3). The oxides may further contain other additives, such as oxides of gadolinium (Gd), samarium (Sm), dysprosium (Dy), or terbium (Tb). In certain embodiments the oxide, in addition to the ytterbia and/or europia, further comprises lanthanum (La), praseodymium (Pr), or neodymium (Nd).
摘要翻译:提出了具有比较高的抗各种液体如水的润湿性的陶瓷材料,以及用这些材料制成的制品。 本文描述的氧化物材料通常含有一种或多种镱(Yb 2 O 3)和欧罗酸(Eu 2 O 3)。 氧化物还可以含有其它添加剂,例如钆(Gd),钐(Sm),镝(Dy)或铽(Tb)的氧化物。 在某些实施方案中,氧化物除了镱和/或欧罗碱之外,还包含镧(La),镨(Pr)或钕(Nd)。
摘要:
Ceramic materials with relatively high resistance to wetting by various liquids, such as water, are presented, along with articles made with these materials, methods for making these articles and materials, and methods for protecting articles using coatings made from these materials. One particular embodiment is an article that comprises a coating having a surface connected porosity content of up to about 5 percent by volume. The coating comprises a material that comprises a primary oxide and a secondary oxide, wherein (i) the primary oxide comprises a cerium cation, and (ii) the secondary oxide comprises a cation selected from the group consisting of the praseodymium and neodymium.
摘要:
Ceramic materials with relatively high resistance to wetting by various liquids, such as water, are presented, along with articles made with these materials, methods for making these articles and materials, and methods for protecting articles using coatings made from these materials. One particular embodiment is an article that comprises a coating having a surface connected porosity content of up to about 5 percent by volume. The coating comprises a material that comprises a primary oxide and a secondary oxide, wherein (i) the primary oxide comprises a cation selected from the group consisting of cerium, praseodymium, terbium, and hafnium, and (ii) the secondary oxide comprises a cation selected from the group consisting of the rare earth elements, yttrium, and scandium. The material is transparent to electromagnetic radiation of at least one type selected from the group consisting of ultraviolet radiation, visible light, and infrared radiation.
摘要:
Ceramic materials with relatively high resistance to wetting by various liquids, such as water, are presented, along with articles made with these materials, methods for making these articles and materials, and methods for protecting articles using coatings made from these materials. One particular embodiment is an article that comprises a coating having a surface connected porosity content of up to about 5 percent by volume. The coating comprises a material that comprises a primary oxide and a secondary oxide, wherein (i) the primary oxide comprises a cation selected from the group consisting of cerium, praseodymium, terbium, and hafnium, and (ii) the secondary oxide comprises a cation selected from the group consisting of the rare earth elements, yttrium, and scandium.
摘要:
A core-shell ceramic particulate is provided. The core-shell ceramic particulate comprises a core particulate structure comprising a plurality of primary particulates and a plurality of primary pores; and a shell at least partially enclosing the core particulate structure. Each of the primary particulates comprises a plurality of secondary particulates and a plurality of secondary pores; and the shell comprises a plurality of tertiary particulates and a plurality of tertiary pores. A method of making a core-shell ceramic particulate is provided. The method comprises the steps of providing a core particulate structure comprising a plurality of primary particulates and a plurality of primary pores wherein each primary particulate comprises a plurality of secondary particulates and a plurality of secondary pores; and disposing a shell comprising a plurality of tertiary particulates and a plurality of tertiary pores onto the core particulate structure.
摘要:
Ceramic materials with relatively high resistance to wetting by various liquids, such as water, are presented, along with articles made with these materials, methods for making these articles and materials, and methods for protecting articles using coatings made from these materials. One embodiment is an article comprising a material that is transparent to electromagnetic radiation of at least one type selected from the group consisting of ultraviolet radiation, visible light, and infrared radiation. The material comprises a primary oxide and a secondary oxide. The primary oxide comprises cerium and hafnium. The secondary oxide comprises a secondary oxide cation selected from the group consisting of the rare earth elements, yttrium, and scandium. Another embodiment is an article comprising a material that is transparent to electromagnetic radiation of at least one type selected from the group consisting of ultraviolet radiation, visible light, and infrared radiation. The material comprises a primary oxide and a secondary oxide. The primary oxide comprises cerium or hafnium. The secondary oxide comprises (i) praseodymium or ytterbium, and (ii) another cation selected from the group consisting of the rare earth elements, yttrium, and scandium.
摘要:
A core-shell ceramic particulate is provided. The core-shell ceramic particulate comprises a core particulate structure comprising a plurality of primary particulates and a plurality of primary pores; and a shell at least partially enclosing the core particulate structure. Each of the primary particulates comprises a plurality of secondary particulates and a plurality of secondary pores; and the shell comprises a plurality of tertiary particulates and a plurality of tertiary pores. A method of making a core-shell ceramic particulate is provided. The method comprises the steps of providing a core particulate structure comprising a plurality of primary particulates and a plurality of primary pores wherein each primary particulate comprises a plurality of secondary particulates and a plurality of secondary pores; and disposing a shell comprising a plurality of tertiary particulates and a plurality of tertiary pores onto the core particulate structure.
摘要:
A membrane structure is provided. A membrane structure has a top surface and a bottom surface. The membrane structure includes a plurality of sintered layers including an inner layer disposed between two outer layers. The membrane structure further includes a nonmonotonic gradient in pore size extending between the top surface and the bottom surface. A method of making a membrane structure is provided. The method includes the steps of providing at least one inner layer; providing a plurality of outer layers; and laminating the inner layer and the outer layers to obtain a membrane structure.
摘要:
Multiphase ceramic nanocomposites having at least three phases are disclosed. Each of the at least three phases has an average grain size less than about 100 nm. In one embodiment, the ceramic nanocomposite is substantially free of glassy grain boundary phases. In another embodiment, the multiphase ceramic nanocomposite is thermally stable up to a temperature of at least about 1500° C. Methods of making such multiphase ceramic nanocomposites are also disclosed.
摘要:
A method of making nanoscale ordered composites of covalent ceramics through block copolymer-assisted assembly. At least one polymeric precursor is mixed with a block copolymer, and self-assembly of the mixture proceeds through an annealing process. During the annealing step, the polymeric precursor cross-links to form a structure robust enough to survive both the order-disorder transition temperature the block copolymer and the pyrolysis process, yielding ordered nanocomposites of high temperature ceramic materials. The method yields a variety of structures and morphologies. A ceramic material having at least one ceramic phase that has an ordered structure on a nanoscale and thermally stable up to a temperature of at least about 800° C. is also disclosed. The ceramic material is suitable for use in hot gas path assemblies, such as turbine assemblies, boilers, combustors, and the like.