| 摘要 |
#CMT# #/CMT# Watch-making component comprises: an amorphous metal alloy (A). #CMT# : #/CMT# Watch-making component comprises: an amorphous metal alloy of formula (Fe aCo bNi cNb dV eB fTa g) (A). a : 0-70; b : 0-70; c : 8-60; d : 1-19; e : 1-10; f : 12-25; and g : 0-5, where a + b is 20-70, the a + b + c is 50-90, the d + e is 5-20, and a + b + c + d + e + f + g is 100. An independent claim is included for preparing the watch-making component, under inert atmosphere, comprising: (a) producing a pre-fusion of pure metallic elements comprising iron and/or cobalt, nickel, niobium and vanadium in a container; (b) heating boron in order to degas; (c) mixing the pre-cast metal elements and boron solid; (d) heating the mixture; (e) cooling; (f) optionally repeating one or more steps of (d) and (e), where the last step (e) is a annealing; and (g) obtaining the alloy required for the watch-making component. #CMT#USE : #/CMT# The watch-making component is useful as spring, preferably barrel (claimed). #CMT#ADVANTAGE : #/CMT# The alloy has improved mechanical properties e.g. good ductility, high elastic strength, very high tensile strength, elastic modulus, hardness, high resistance to embrittlement. The process of preparing watch-making component is suitable for industrial scale. #CMT#INORGANIC CHEMISTRY : #/CMT# Preferred Process: The step (c) is divided into sub-steps of formation of partial mixing to form pre-alloys whose melting temperature is lower than that of individual components. In the step (g), the amorphous metal alloy is cast in the form of ribbon or yarn. The annealing and casting in the form of ribbon or yarn are performed simultaneously. The annealing and casting is done by planar flow casting. #CMT#DEFINITIONS : #/CMT# Preferred Definitions: c : 17-23; d : 3-9; e : 4-10; f : 13-17; and a, b, g : 0. #CMT#SPECIFIC COMPOUNDS : #/CMT# The use of 17 compounds (A) are specifically claimed e.g. iron nickel niobium vanadium boron alloy of formulae (Fe 5 6Ni 1 8Nb 6V 5B 1 5) (Aa), (Fe 5 4Ni 2 0Nb 6V 5B 1 5) (Ab), (Fe 5 2Ni 2 2Nb 6V 5B 1 5) (Ac), (Fe 5 0Ni 2 2Nb 6V 7B 1 5) (Ad), and (Fe 3 0Co 2 0Ni 2 2Nb 8V 5B 1 5) (Ae). |
