Method of producing refractory bodies having controlled porosity Patent
Production of refractory bodies with controlled porosity by pressing and heating mixtures of refractory and inert metal powders
Todd, H. H.↗
Engineering topics
Todd, H. H.
Publications and source records attributed to Todd, H. H..
Shock tube powder dispersing apparatus Patent
Apparatus for mechanically dispersing ultrafine metal powders subjected to shock waves
Todd, H. H.↗
Grain growth inhibitor for porous tungsten materials
Boron, either uncombined or combined with nitrogen or carbon added to tungsten powder prior to processing, effectively inhibits grain growth. The tungsten material is stable up to 1800 degrees C.
Todd, H. H.↗
Method for controlling density and permeability of sintered powdered metals
Improved, relatively low-cost method has been developed to produce porous metals with predetermined pore size, pore spacing, and density, utilizing powder-metal processes. The method uses angular not spherical tungsten powder.
Todd, H. H.↗
Process reduces pore diameters to produce superior filters
Porous metal structure with very small pore diameters is produced by heating the structure in oxygen for an oxidized surface layer, cooling it, and heating it in hydrogen to deoxidize the oxidized portion. Such structures are superior catalyst beds and filters.
Todd, H. H.↗
Wire bundle formed into grids with minute interstices
Deforming the ends of a bundle of closely packed parallel wires to restrict the interstices to substantially uniform and minute dimensions produces grids or filters for ion engines. Porous metal structures made by this process are also used as fuel cell electrodes, diffusion membranes, and catalysts.
Todd, H. H.↗