摘要:
A joined body 20 includes a first member 22 having a thermal expansion coefficient of 8 ppm/K or less, a second member 24 having a thermal expansion coefficient of 12 ppm/K or more, and a joining portion 30 composed of an electrically conductive oxide containing 50% by mass or more of a spinel-type ferrite phase, the joining portion 30 joining the first member and the second member. The electrically conductive oxide preferably contains Fe and element A (where element A represents one or more selected from the group consisting of Mg, Mn, Co, Ni, Cu, and Zn). The molar ratio of element A to Fe, i.e., A/Fe, is 0.5 or less.
摘要:
The invention provides novel railroad ties manufactured from novel composite materials that possess excellent physical and performance characteristics matching or exceeding existing concrete RRTs. The RRTs of the invention can be readily produced from widely available, low cost raw materials by a process suitable for large-scale production with improved energy consumption and more desirable carbon footprint and minimal environmental impact.
摘要:
A method of manufacturing terrazzo tiles and tiles manufactured in accordance with the method is described. A resin, curing agent, filler, and pigment are poured into a mold. Stone chips are then poured into the mold to settle with the majority at the bottom of the mold. Thereafter, curing occurs to result in rough tiles which are ground and then polished with the upper surface being the resulting tile surface at which the majority of the stones settle. The tiles are assembled onto a floor with grout lines resulting from spacing of the tiles, one from another. Grout made of resin or a resign and terrazzo chip mixture is then poured in and skived, and the floor polished to result in a sealed monolithic surface.
摘要:
Tools for the forming of composite parts from composite forming materials, having tool bodies that comprise, at least in part, carbon foam and high density carbon foam are described. In some embodiments, a surface of the carbon foam or high density carbon foam may comprise a tool face. In other embodiments, the carbon foam or high density carbon foam may support an other material, referred to as tool face material, wherein a surface of the tool face material may comprise a tool face. The tools of the present invention may be lighter, more durable, and less costly to produce and/or use than conventional tools used for the production of composite parts, particularly those tools used for the production of carbon composites. Additionally, such tools may be reusable, repairable, and more readily modifiable.
摘要:
A building element may be formed from a first cementitious mixture and a second cementitious mixture containing a photocatalytic cementitious mixture. The first cementitious mixture and the photocatalytic cementitious mixture may be co-formed into a shaped uncured two layer monolith having a base layer of the first cementitious mixture and a top layer of the photocatalytic cementitious mixture. The shaped uncured two layer monolith is then cured. The resulting building element may be algae-resistant.
摘要:
An assembly comprising carbon foam and high density carbon foam is described. In some embodiments, such an assembly may be a composite or composite assembly. One or more pieces of carbon foam and high density carbon foam may comprise the assembly. The assembly may comprise other materials in addition to the carbon foam and high density carbon foam. One or more of any given type of other material may be incorporated into the composite. Additionally, a given other material may be incorporated in more than one volume or location on or in the assembly. The other materials may provide for bonding of the elements of the assembly together, strengthening of the assembly, increased assembly oxidation and weathering resistance, modification of the electrical, thermal, or fluid transport properties of the assembly, and any of a number of other purposes.
摘要:
A shield for deflecting or shielding exhaust gas streams is described. The exhaust shield may comprise a shielding layer comprised of high density carbon foam. The exhaust shield may include an exhaust shield support layer affixed to the shielding layer. In some embodiments the exhaust shield support layer comprises carbon foam. If desired the exhaust shield may be comprised of more than one layer of high density carbon foam or carbon foam. The layers of carbon foam and high density carbon foam may be arranged sequentially through the thickness of the panel. The exhaust shield may be used to protect structures from exhaust gas streams such as those from engines or motors, including jet engines or rocket motors.
摘要:
A porous concrete road surface structure made from polymer modified cement and a construction method thereof are disclosed. The structure successively comprises a bottom layer, a bonding layer, a porous concrete layer and a surface treatment layer. The bonding layer is located on the bottom layer, and the porous concrete layer on the bonding layer is prepared through paving, leveling and jolting a composition mixed from broken stone, sand and a slurry mixture of polymer modified cement. The addition of polymer promotes bonding of granular materials with the slurry mixture tightly, the use of the bonding layer makes the road surface structure and the bottom layer form an integral body, and the road surface structure has high strength, good crack resistance, water resistance, ageing resistance and corrosion resistance; the use of an intermittent or single graded of particles results in large pores, makes the road surface water-penetrating, decreases noise and amount of the polymer; and, the surface treatment can improve markedly surface properties and its use according to the application can make the porous concrete layer has rigid or flexible characteristic. The porous concrete road surface can be paved, leveled and jolted by paving machine or manual labor.
摘要:
A reformer substrate for supporting a catalyst in a hydrocarbon reformer, comprising a graded structure that is inhomogeneous either radially, longitudinally, or both. The inhomogeous graded structure components are selected and arranged to maintain the catalyst operating temperature during extended periods of catalytic inactivity. Selection is based primarily on heat capacity and/or thermal loss properties. Generally, the perimeter of the substrate, radially and/or longitudinally comprises a thick wall of high thermal mass materials to reduce conductive and radiated heat loss, and a high thermal capacity material within the substrate to reduce radiated heat loss. Preferred materials are open-cell rigid foams such as zirconia-toughened alumina reticulated foam, for negative thermal loads in endothermic reaction regimes, and zirconia-mullite honeycomb monolith, for positive or neutral thermal loads in exothermic or autothermic reaction regimes.
摘要:
A coalescing additive is used in the manufacturing process for gypsum wallboard. Such an additive increases the surface area and density of the slurry at the paper to core interface by coalescing the foam cells away from the paper core interface. This permits a stronger paper to core bond to form and increases the compressive strength of the gypsum wallboard as compared to standard wallboards made from slurries with reduced water levels.