Abstract:
The invention concerns a production of precision castings by centrifugal casting, comprising the following steps: a) providing a centrifugal casting device having a rotor (1) being rotatable around an axis (A), and at least one crucible (8) being accommodated in the rotor (1) and at least one mold (4) being associated with said crucible (8) and being accommodated in a first radial distance (r1) from the axis (A), b) creating a metal melt (15) within the crucible (8), c) rotating the rotor (1) and thereby forcing the melt (15) by means of centrifugal forces from the crucible (8) into the mold (4), d) exerting a pressure on the melt (15) being forced into the mold (4) until the temperature of the solidifying melt (15) has reached a predetermined cooling-temperature in a range of 1300° to 800 °C, wherein the pressure corresponds to the centrifugal force acting on the melt (15) at the moment when the mold (4) is completely filled times a factor of 1.0 to 5.0, and e) relieving the pressure when the temperature of the solidifying melt (15) is smaller than said predetermined cooling-temperature.
Abstract:
An actuator or an engine equipped with a valve made from a titanium-tantalum based shape memory alloy, wherein the said alloy consists of 15-35mol% tantalum and a certain amount of additive elements to make the total tantalum equivalent in the range of 30-39mol% and the balance titanium and unavoidable impurities, wherein said alloy comprises at least one element selected from the group consisting of Zr,Hf,Sn, α-phase stabilizing element, interstitial elements, β-stabilizing elements and transition elements as the said additive.
Abstract:
A hot-forged TiAl-based alloy having excellent oxidation resistance and high strength at high temperatures, and a process for producing such an alloy. A TiAl-based alloy comprising Al: (40+a) atomic % and Nb: b atomic %, with the remainder being Ti and unavoidable impurities, wherein a and b satisfy formulas (1) and (2) below. 0 ≤ a ≤ 2 3 + a ≤ b ≤ 7 + a Also, a TiAl-based alloy comprising Al: (40+a) atomic % and Nb: b atomic %, and further comprising one or more elements selected from the group consisting of V: c atomic %, Cr: d atomic % and Mo: e atomic %, with the remainder being Ti and unavoidable impurities, wherein a to e satisfy formulas (3) to (9) shown below. 0 ≤ a ≤ 2 3 + a ≤ b + 1.0 c + 1.8 d + 3.8 e ≤ 7 + a b ≥ 2 c ≥ 0 d ≥ 0 e ≥ 0 c + d + e > 0
Abstract:
A sliding member for a compressor includes a base metal, a first layer and a second layer. The base metal is made of an aluminum-based metal. The first layer is formed on or over the base metal and made of a nickel-based plating layer containing at least one material of nitrogen (N), silicon (Si), titanium (Ti), chromium (Cr) and aluminum (Al) as an additive. The second layer is formed on the surface of the first layer and made of a diamond-like carbon layer containing the same additive as the additive contained in the first layer.
Abstract:
A compressor includes a swash plate, and a shoe connected to an outer periphery of the swash plate. A surface of the swash plate slides upon a flat surface of the shoe. A sliding film is applied to the surface of the swash plate. The sliding film is formed of binder resin which contains a solid lubricant and titanium oxide powder. This allows the surface of the swash plate and the flat surface of the shoe to smoothly slide upon each other.
Abstract:
A liquid pumping, handling and spraying system for liquid compositions and especially those liquid coating compositions having a suspension of metal particulate therein which tends to settle out of suspension of metal particulate therein which tends to settle out of suspension quite rapidly and which includes metal particulate having an affinity for adherence to metal surfaces. A fluid supply system is provided which accomplishes continuous agitation of the liquid composition to sprayed to maintain the metal particulate thereof in properly entrained suspension and even distribution with the liquid carrier fluid and which permits the use of low cost, lightweight containers for the liquid supply. A packingless pump is provided for pressurized delivery of the liquid composition from the supply container to a packingless spray gun. The packingless pump achieves pumping of liquid by hydro mechanical deformation of polymer variable volume pump chambers which induce intermittent suction and pressurization of the liquid for pumping and which have externally mounted check valve heads for controlling the flowing of the pumped liquid from the supply container to the spray gun. The packingless spray gun employs a body of resilient polymer which functions as a columnar spring to control the opening and closing movement of a spray valve assembly. Valve seats of the check valve head and spray gun assembly may be of flexible nature to ensure efficient separation of metal particulate therefrom. Metal operational components of the check valve head and spray gun, such as valve stems and valves define outer surfaces composed of titanium to minimize metal particulate adherence thereto.
Abstract:
La présente invention se rapporte à un cylindre de moteurs à pistons et à un procédé de fabrication dudit cylindre. L'alésage du cylindre se caractérise par sa surface qui est en céramique à base d'oxyde d'aluminium avec une densité de 3,85 à 3,95 g/cm3 et qui contient de 0,2 à 3,0 % en masse de fluorure de calcium et/ou de magnésium ou de bioxyde de titane. On produit l'alésage du cylindre qui est revêtu de céramique d'oxyde en plaçant un corps cylindrique fritté à une température comprise entre 1450°C et 1750°C dans le cylindre du moteur de combustion interne, où il est fixé à l'aide d'un joint de serrage par retrait.
Abstract:
PROBLEM TO BE SOLVED: To provide a spark ignition type internal-combustion engine capable of enhancing thermal efficiency without bringing about deterioration in knocking.SOLUTION: Base material 30 to form a combustion chamber 13 has a wall surface 30a which faces inside the combustion chamber 13, and has a thin film 20 for heat insulation hereon, wherein the thin film 20 meets a formula 16.7×λ≤L≤207.4 × (κ), where λ is a thermal conductivity in W/(m×K), κ is thermal diffusivity in mm/s, and L is thickness in μm. Thereby heat loss Q_total escaping from the intra-cylinder gas to the combustion chamber wall in all strokes can be reduced without bringing about deterioration in knocking caused by increase in the heating value Q_intake of the intra-cylinder gas in the suction stroke.