A Gold alloy for jewelry, comprising: Gold: in the amount comprised between 780 and 840 in weight; Copper: in the amount comprised between 125 and 167 in weight; Silver: in the amount comprised between 15 and 54 in weight; Platinum or Palladium, wherein the content of Palladium or Platinum is such that the assembly of Gold, Copper, Silver and Platinum or Gold, Copper, Silver and Palladium reaches a percentage at least equal to 980, and more preferably the 1000 in weight of the alloy;
and wherein the so composed Gold alloy shows, under the conditions referred to in the ISO DIS 8654:2017 standard, a color compatible with the 5N alloy color standard.

A Gold alloy for jewelry, comprising: Gold: in the amount comprised between 780 and 840 in weight; Copper: in the amount comprised between 125 and 167 in weight; Silver: in the amount comprised between 15 and 54 in weight; Platinum or Palladium, wherein the content of Palladium or Platinum is such that the assembly of Gold, Copper, Silver and Platinum or Gold, Copper, Silver and Palladium reaches a percentage at least equal to 980, and more preferably the 1000 in weight of the alloy;
and wherein the so composed Gold alloy shows, under the conditions referred to in the ISO DIS 8654:2017 standard, a color compatible with the 5N alloy color standard.

A discoloration resistant Gold alloy for jewelry characterized in that it comprises in weight: Gold, in the amount comprised between 755 and 770, Copper, in the amount comprised between 165 and 183, Silver, in the amount comprised between 28 and 50, Palladium, in the amount comprised between 19 and 23 and Iron, in the amount comprised between 2 and 6.
and characterized by the absence of Vanadium.

A discoloration resistant Gold alloy for jewelry characterized in that it comprises in weight: Gold, in the amount comprised between 755 and 770, Copper, in the amount comprised between 165 and 183, Silver, in the amount comprised between 28 and 50, Palladium, in the amount comprised between 19 and 23 and Iron, in the amount comprised between 2 and 6.
and characterized by the absence of Vanadium.

Platinum-nickel-based ternary or higher alloys include platinum at about 65-80 wt. %, nickel at about 18-27 wt. %, and about 2-8 wt. % of ternary or higher additions that may include one or more of Ir, Pd, Rh, Ru, Nb, Mo, Re, W, and/or Ta. These alloys are age-hardenable, provide hardness greater than 580 Knoop, ultimate tensile strength in excess of 320 ksi, and elongation to failure of at least 1.5%. The alloys may be used in static and moveable electrical contact and probe applications. The alloys may also be used in medical devices.

Platinum-nickel-based ternary or higher alloys include platinum at about 65-80 wt. %, nickel at about 18-27 wt. %, and about 2-8 wt. % of ternary or higher additions that may include one or more of Ir, Pd, Rh, Ru, Nb, Mo, Re, W, and/or Ta. These alloys are age-hardenable, provide hardness greater than 580 Knoop, ultimate tensile strength in excess of 320 ksi, and elongation to failure of at least 1.5%. The alloys may be used in static and moveable electrical contact and probe applications. The alloys may also be used in medical devices.

An object is to provide a catalyst particle that can exhibit high activity. The catalyst particle is an alloy particle formed of platinum atom and a non-platinum metal atom, wherein (i) the alloy particle has an L1.sub.2 structure as an internal structure and has an extent of ordering of L1.sub.2 structure in the range of 30 to 100%, (ii) the alloy particle has an LP ratio calculated by CO stripping method of 10% or more, and (iii) the alloy particle has a d.sub.N/d.sub.A ratio in the range of 0.4 to 1.0.

The present invention relates to kits and methods for calibrating a pump through performance of a thermal knockdown process including demagnetization of an impeller of the pump where the impeller is separate from the pump. By heat treating the impeller, a property of magnetic interaction of the pump is reduced in a repeatable manner. A kit includes a pump with impeller, a controller and an oven. The method generally involves an iterative process of testing the pump for a property related to magnetic interaction of the elements of the pump, removing the impeller from the pump, heating the impeller under controlled conditions, then placing the impeller back into the pump to repeat the test performed initially.

The present invention relates to kits and methods for calibrating a pump through performance of a thermal knockdown process including demagnetization of an impeller of the pump where the impeller is separate from the pump. By heat treating the impeller, a property of magnetic interaction of the pump is reduced in a repeatable manner. A kit includes a pump with impeller, a controller and an oven. The method generally involves an iterative process of testing the pump for a property related to magnetic interaction of the elements of the pump, removing the impeller from the pump, heating the impeller under controlled conditions, then placing the impeller back into the pump to repeat the test performed initially.

The present disclosure provides for a gold alloy composition that has a greater hardness than conventional gold alloys of the same composition. The gold alloy composition includes 96.4-97% gold by weight. The composition also includes elements improving hardness and golden yellow color in the proportion of 3-3.6% by weight, which are one or more elements among: silver, copper, zinc, nickel, cobalt, gallium, tin, antimony, and iron. The composition also includes elements improving the flowing of melted gold alloy and surface smoothness, which are one or more elements among: iridium, palladium, aluminum, indium, silicon, germanium and lead. An example procedure is also provided to increase the hardness of gold alloys.