8 results about "Cerium" patented technology

A process for preparing an amine by reacting a primary or secondary alcohol, aldehyde and/or ketone with hydrogen and a nitrogen compound selected from the group of ammonia and primary and secondary amines, in the presence of a supported copper-, nickel- and cobalt-containing catalyst, wherein the catalytically active material of the catalyst, before the reduction thereof with hydrogen, comprises oxygen compounds of aluminum, of copper, of nickel, of cobalt and of tin, and in the range from 0.2 to 5.0% by weight of oxygen compounds of yttrium, of lanthanum, of cerium and/or of hafnium, each calculated as Y₂O₃, La₂O₃, Ce₂O₃ and Hf₂O₃ respectively, and catalysts as defined above.

A high-strength high-conductivity rare earth copper-magnesium alloy contact wire comprises, by weight percentage, 0.1-0.8% of magnesium, 0.1-0.4% of nickel, 0.1-0.4% of zinc, 0.1-0.4% of silver, 0.05-0.15% of a rare earth element and the balance copper and inevitable impurity elements, wherein the rear element is one or two of cerium and neodymium. When the rare earth element is added in the form that the cerium and neodymium are mixed, the weight ratio of the cerium and neodymium is 1:1-1:2. The high-strength high-conductivity rare earth copper-magnesium alloy contact wire overcomes the technical defect that the requirements on electrical conductivity and the tensile strength of a copper-magnesium alloy cannot be met at the same time in the prior art and can meet the performance requirement of the copper alloy for the railway contact wire.

The invention provides the high-strength 23Mn2CrNiMnVERA steel for railway train connection and a preparation method thereof. The 23Mn2CrNiMnVERA steel comprises the following components of carbon, silicon, manganese, vanadium, aluminum, chromium, molybdenum, nickel, cerium, copper, phosphorus, sulfur, Fe and non-removable impurities; the preparation method comprises the steps of molten iron pretreatment, converter smelting, LF refining, VD vacuum refining and continuous casting tapping. The high-strength 23Mn2CrNiMoVREA steel for connection has the advantages of being easy to weld, high in tensile property and high in yield strength at low temperature (-60 DEG C); and the preparation method of the high-strength 23Mn2CrNiMnVERA steel for the railway train connection has the advantages of being easy to control in the process and suitable for popularization.

The invention relates to low-silver high-strength lead-free tin-based brazing filler metal and a preparation method thereof. The low-silver high-strength lead-free tin-based brazing filler metal is prepared from, by mass, 0.3%-1.0% of silver, 0.5%-0.9% of copper, 0.03%-0.5% of cobalt, 0.1%-1.0% of aluminum oxide, 0-0.05% of microelements and the balance tin. The preparation method of the low-silver high-strength lead-free tin-based brazing filler metal comprises the following steps that silver, tin and copper are smelted into smelting liquid; if cobalt exists in the components, tin and cobalt are added into the smelting solution; if cerium and/or phosphorus exist in the components, adding the copper-cerium alloy and/or the copper-phosphorus alloy wrapped by the tin foil into the molten smelting solution; after all the elements are melted, aluminum oxide powder is added, and smelting is conducted for 2-3 hours at the temperature of 500-600 DEG C; and injection molding. The method is convenient to smelt, low in loss, good in wettability, appropriate in melting temperature, small in welding spot, high in strength, good in reliability and resistant to high temperature.

The invention relates to a textile fiber product containing rare earth elements. The textile fiber product contains a textile fiber product body and rare earth elements. The rare earth elements are artificial promethium and neodymium-cerium alloy, the rare earth elements and the textile fiber product are combined by electrostatic adsorption, electrostatic adsorption has small damage to the textile fiber product, adding of the rare earth elements does not change the color and softness, the ferromagnetism of the rays and alloy in the rare earth elements also plays a certain role in health in addition to industrial and living fields. The textile fiber product provided by the invention utilizes the ferromagnetism, heat sources, light and other characteristics generated by rays and alloy in active elements of rare earth, realizes the functions of rare earth in the textile fiber product, and achieves the purposes of life cultivation and health preservation.