摘要:
A method of fabricating a ceramic component includes using vapor infiltration to deposit a ceramic coating within pores of a porous structure to form a preform body with residual interconnected porosity. Transfer molding is then used to deposit a heated, liquid glass or glass/ceramic material into the residual interconnected porosity. The liquid ceramic or ceramic/glass material is then solidified to form a ceramic component.
摘要:
A method of fabricating a ceramic component includes initially partially filling pores of a porous structure using one of a first processing technique or a second, different processing technique to form a preform body with residual porosity. The first processing technique produces a first ceramic material in the pores of the porous structure and a second processing technique produces a second ceramic material in the pores of the porous structure. When the first processing technique is used to initially partially fill the pores of the porous structure, the second processing technique is used thereafter to at least partially fill the residual porosity with the second ceramic material. When the second processing technique is used to initially partially fill the pores, the first processing technique is used thereafter to at least partially fill the residual porosity.
摘要:
A device for use in a fluid system includes a fuel channel for receiving fuel having dissolved gas therein. A gas permeable membrane supported by a porous support, the gas permeable membrane in communication with the fuel channel. A gas-removal channel adjacent the gas permeable membrane for receiving the dissolved gas from the fuel through the gas permeable membrane and the porous support.
摘要:
A refractory ceramic composite for an armor shell, comprising a ceramic core that is formable to replicate a portion of a three dimensional surface, e.g., of an aircraft, to provide ballistic protection. A method of making a shell of refractory ceramic armor capable of conforming to the geometry is provided. The shell is formed by forming a mold to replicate the surface area; arranging a ceramic core on the mold; and removing the mold to leave said ceramic core, and heat treating the ceramic core to a desired hardness. The ceramic core is in the shape of the surface area.
摘要:
A fuel cell includes an electrode assembly having an electrolyte between a cathode catalyst and an anode catalyst, and a flow field plate having a channel for delivering a reactant gas to the electrode assembly. The flow field plate includes a channel having a channel inlet. A porous diffusion layer is located between the electrode assembly and the flow field plate. The porous diffusion layer includes a first region near the channel inlet and a second region downstream from the first region relative to the channel inlet. The first region includes a filler material that partially blocks pores of the first region such that the first region has a first porosity and the second region has a second porosity that is greater than the first porosity.
摘要:
The present disclosure relates to a fluid purification device that has a deactivation resistant photocatalyst having nanocrystallites of less than 14 nanometers (nm) in diameter with at least 200 m2 surface area/cm3 of skeletal volume in cylindrical pores of 5 nm in diameter or larger, with the mode of the pore size distribution 10 nm or more.
摘要翻译:本公开内容涉及一种流体净化装置,其具有抗失活光催化剂,其具有直径小于14纳米(nm)的纳米晶体,直径为5nm或更大的圆柱形孔中具有至少200m 2的表面积/ cm 3的骨架体积, 孔径分布的模式为10nm以上。
摘要:
A composite article includes a substrate and a powder-derived composite coating on the substrate. The composite coating includes discrete regions of a first material and discrete regions of a second material. At least one of the first material or the second material is a chemical precursor.
摘要:
A method for making a membrane electrode assembly includes the steps of providing a membrane electrode assembly including an anode including a hydrogen oxidation catalyst; a cathode; a membrane disposed between the anode and the cathode; and depositing a peroxide decomposition catalyst in at least one position selected from the group consisting of the anode, the cathode, a layer between the anode and the membrane and a layer between the cathode and the membrane wherein the peroxide decomposition catalyst has selectivity when exposed to hydrogen peroxide toward reactions which form benign products from the hydrogen peroxide. The peroxide decomposition catalyst can also be positioned within the membrane. Also disclosed is a power-generating fuel cell system including such a membrane electrode assembly, and a process for operating such a fuel cell system.
摘要:
A refractory metal composite article includes a refractory metal ceramic section and a refractory metal ceramic coating disposed directly adjacent to the refractory metal ceramic section. The refractory metal ceramic section and the refractory metal ceramic coating form a composite porous matrix. Each of the refractory metal ceramic section and the refractory metal ceramic coating includes at least one of a refractory metal carbide, a refractory metal silicide, or a refractory metal boride. A solid filler is disposed within pores of the composite porous matrix, and the solid filler is selected from a polymer material, a ceramic material, a metallic material, a glass material, and a glass ceramic material.
摘要:
A micro heat exchanger system includes a first flow path and a second flow path transverse thereto for transferring thermal energy between a first fluid flowing through the first flow path and a second fluid flowing through the second flow path. The first flow path and the second flow path are filled with a thermally conductive porous network which incorporate unique structures, such as tubes, honeycomb, corrugated metal, reticulated foams, woven meshes or nonwoven mats or felts, engineered lattice structures, or a combination of these structures. In another embodiment, the thermally conductive porous network is coated with catalyst to provide an integrated heat exchanger and catalytic reactors.