Abstract:
A method of bonding a metal to a substrate involves forming a plurality of nano-features in a surface of the substrate, where each nano-feature is chosen from a nano-pore and/or a nano-crevice. In a molten state, the metal is over-cast onto the substrate surface, and penetrates the nano-features. Upon cooling, the metal is solidified inside the nano-features, where the solidification of the metal forms a mechanical interlock between the over-cast metal and the substrate.
Abstract:
A method of bonding a metal to a substrate is disclosed herein. The method involves forming a nano-brush on a surface of the substrate, where the nano-brush includes a plurality of nano-wires extending above the substrate surface. In a molten state, the metal is introduced onto the substrate surface, and the metal surrounds the nano-wires. Upon cooling, the metal surrounding the nano-wires solidifies, and during the solidifying, at least a mechanical interlock is formed between the metal and the substrate.
Abstract:
A method of bonding a metal to a substrate involves forming an oxide layer on a surface of the substrate, and in a molten state, over-casting the metal on the substrate surface. The over-casting drives a reaction at an interface between the over-cast metal and the oxide layer to form another oxide. The other oxide binds the metal to the substrate surface upon solidification of the over-cast metal.
Abstract:
A system and method for predicting fatigue life in metal alloys for very high cycle fatigue applications. The system and method are especially useful for cast metal alloys, such as cast aluminum alloys, where a fatigue endurance limit is either non-existent or hard to discern. Fatigue properties, such as fatigue strength in the very high cycle fatigue region, are based on a modified random fatigue limit model, where the very high cycle fatigue strength and infinite life fatigue strength are refined to take into consideration the sizes of the discontinuities and microstructure constituents since the fatigue life scatter depends upon the presence of discontinuities and microstructure constituents. The sizes of the discontinuities and microstructure constituents that can initiate fatigue cracks can be determined with extreme value statistics, then input to the modified random fatigue limit model.
Abstract:
Die casting of some magnesium alloys may yield castings that are susceptible to corrosion when exposed to salt water or other aggressive oxidizing environments. Such corrosion may result from the existence of different microstructures in a cross-section of the die casting (e.g. between the surface of the part and the center) that produce galvanic couples that are susceptible to such corrosive attack. However, a die temperature may be determined for casting of the part such that a more uniform cross-sectional microstructure is produced in which minimal or negligible galvanic potentials are produced.
Abstract:
Disclosed are electrorheological fluids having spherical, or near-spherical, fullerene-type particles and a nonconducting or dielectric fluid.
Abstract:
Disclosed are electrorheological fluids having ceramic particles of high ion conductivity and a nonconducting or dielectric fluid. The high ion conductive particle may be a material having the formula A.sub.1+x Zr.sub.2 Si.sub.x P.sub.3-x O.sub.12, where A is a monovalent ion, such as a material comprising at least one selected from the group consisting of Li, Na, K, Ag and Cu; and x ranges from 0 to 3. The liquid phase may include a silicone fluid or mineral oil. In the case of a mineral oil, the oil may also include an amine-terminated polyester to improve stability of the fluid.
Abstract:
Disclosed are electrorheological fluids having zeolite particles and a nonconducting or dielectric fluid. The liquid phase includes an amine-terminated polyester to improve stability of the fluid.
Abstract:
Disclosed are electrorheological fluids having ceramic particles of high ion conductivity and a nonconducting or dielectric fluid. The high ion conductive particle may be a material having the formula Na.sub.3 PO.sub.4. The liquid phase may include a silicone fluid or mineral oil. In the case of a mineral oil, the oil may also include an amine-terminated polyester to improve stability of the fluid.
Abstract translation:公开了具有高离子电导率的陶瓷颗粒和不导电或介电流体的电流变流体。 高离子导电颗粒可以是具有式Na 3 PO 4的材料。 液相可以包括硅油或矿物油。 在矿物油的情况下,油也可以包括胺封端的聚酯以改善流体的稳定性。
Abstract:
A component includes a cast portion and an insert. The cast portion includes a sacrificial suspension device. The insert is configured to provide damping to the component. The sacrificial suspension device is dissolved during a casting process, into a molten material, forming the cast portion such that the insert is fully encapsulated by the cast portion, including the dissolved suspension device.