Abstract:
A membrane actuator includes a magnetically actuatable membrane and a magnetic trigger. The membrane includes a shape memory alloy (SMA), and the magnetic trigger is configured to induce a martensitic transformation in the SMA, to produce a larger force than would be achievable with non-SMA-based materials. Such a membrane actuator can be beneficially incorporated into a wide variety of devices, including fluid pumps, shock absorbing systems, and synthetic jet producing devices for use in an aircraft. The membrane/diaphragm can be formed from a ferromagnetic SMA, or a ferromagnetic material can be coupled with an SMA such that the SMA and the ferromagnetic material move together. A hybrid magnetic trigger, including a permanent magnet and an electromagnet, is preferably used for the magnetic trigger, as hybrid magnetic triggers are easy to control, and produce larger magnetic gradients than permanent magnets or electromagnets alone.
Abstract:
A piston for diesel engines is made of a toughness-increasing aluminium alloy containing copper, nickel, silicon, magnesium, iron and manganese. The use of this material, which can conventionally be chill-cast, and by implying special dimensions, provides a piston which, despite its relatively light construction, provides the utmost security against cracking in the stressed regions, e.g. the piston boss or the combustion chamber recess.
Abstract:
Vorgeschlagen wird ein Verfahren zur Herstellung von Zylinderköpfen (1) für Verbrennungsmotoren aus im Kokillenguss geformten Al-Si-Legierungen. Mindestens eine thermisch und/oder mechanisch besonders beanspruchte Materialzone (10) des Gussteils wird einer die Gefügestruktur beeinflussenden Nachbehandlung unterzogen. Zur Steigerung der Gefügefeinheit in der Materialzone (10) wird diese durch Reibrühren mittels eines rotierenden Stiftes (16) behandelt, der quer zu seiner Rotationsachse durch die Materialzone (10) hindurch bewegt wird.
Abstract:
A sliding device 1 is constituted of a swash plate 3 including a first sliding surface 3A and a semispherical shoe 4 sliding with the swash plate 3. The swash plate 3 is constituted of a base material 3B of high strength brass containing Mn and Si, and very small granular Mn-Si compounds 6 are exposed on an inside of the base material 3B and on the first sliding surface 3A (surface of the base material 3B). The above described swash plate 3 increases in exposure amount of the Mn-Si compounds 6 exposed on the first sliding surface 3A being the surface by applying etching to the base material 3B after cutting the base material 3B. The sliding device 1 which is favorable in seizure resistance at low manufacturing cost as compared with the conventional sliding devices can be provided.
Abstract:
An aqueous phosphoric bonding solution consists essentially of phosphoric acid, a source of magnesium ions, and a leachable corrosion inhibitor. The bonding solution is stable with respect to inorganic metal particles, such as aluminum, which are admixed to the bonding solution for the preparation of a coating slurry. Metal parts coated with the coating compositions have very satisfactory properties such as heat and corrosion resistance.
Abstract:
An aqueous phosphoric bonding solution consists essentially of phosphoric acid, a source of magnesium ions, and a leachable corrosion inhibitor. The bonding solution is stable with respect to inorganic metal particles, such as aluminum, which are admixed to the bonding solution for the preparation of a coating slurry. Metal parts coated with the coating compositions have very satisfactory properties such as heat and corrosion resistance.
Abstract:
Multiple embodiments of ferromagnetic shape memory alloy (FSMA) based torque actuators are described. These torque actuators include a magnetic trigger and an FSMA member, which when actuated by the magnetic trigger, produces a torque for rotating a member. Examples of magnetic triggers include hybrid magnetic triggers having at least one electromagnet and at least one permanent magnet. The FSMA member can be configured as a coil (or plate) spring and can be fabricated of a true FSMA alloy (i.e., an alloy that exhibits both ferromagnetic and shape memory properties) or of an FSMA composite that includes a ferromagnetic portion and an SMA portion. Several embodiments include a central orifice in which the FSMA member and an axial rod configured to rotate when actuated are disposed; the magnetic trigger system is disposed about the periphery of the orifice.
Abstract:
Die vorliegende Anmeldung betrifft ein Verfahren zur Herstellung eines Motorbauteils, insbesondere eines Kolbens für einen Verbrennungsmotor, bei dem eine Aluminiumlegierung im Druckgussverfahren abgegossen wird. Dabei weist die Aluminiumlegierung die folgenden Legierungselemente auf: Silizium: 11 Gew.-% bis 14,5 Gew.-%, Nickel: 1,7 Gew.-% bis 3,5 Gew.-%, Kupfer: 3,7 Gew.-% bis 5,2 Gew.-%, Magnesium: 1,6 Gew.-% bis 3,5 Gew.-%, Eisen: 0,6 Gew.-% bis 1,5 Gew.-%, Mangan: 0,2 Gew.-% bis 0,4 Gew.-%, Zirkonium: 0,04 Gew.-% bis 0,1 Gew.-%, Vanadium: 0,04 Gew.-% bis 0,1 Gew.-%, wobei die Aluminiumlegierung im Übrigen Aluminium und nicht zu vermeidende Verunreinigungen aufweist.