The master alloys for high-temperature alloys
(57) Abstract:The invention relates to metallurgy, in particular to the production of heat-resistant alloys. Ligature contains 90 to 96 wt. molybdenum, magnesium else that can provide security when obtaining heat-resistant alloys, and also to improve their quality. table 1. The invention relates to metallurgy, in particular to the production of heat-resistant alloys using ligatures.Known ligature  representing tonkorassechennoyj mixture consisting of 10-90% aluminum and 90-10% of at least one of the following metals: Mn, Cr, W, Mo. The ligature used in the form of compact density 65-95% of theoretical.A disadvantage of the known alloys is the high consumption of ligatures and its low specific weight. With the introduction of ligatures in the melt it floats on the surface that hinders its interaction with components of the alloy and reduces its quality.The closest technical solution is nickelmania ligature containing 13-16 wt. magnesium 
The disadvantage of this ligature is its low specific weight (weight of 5.4-5.8 g/cm3). With the introduction of ligatures in the melt it floats on its surface, which leads to h is I in the form of this ligature is the fire evaporated magnesium, that can lead to explosions of equipment, especially a vacuum. Evaporating magnesium and splashing of the melt also complicate the monitoring and control process of the melting alloy.The task of the invention to develop ligatures for molybdenum-containing heat-resistant alloys, providing security in their production and improve the quality of the obtained alloys.The problem is solved in that the ligature for heat-resistant alloys containing magnesium, additionally contains molybdenum in the following ratio, wt. Molybdenum 90-96 Magnesium Else
The content of molybdenum in the amount of 90-96 wt. provides almost complete absorption of magnesium and eliminates proeffect.This is achieved by the fact that the intake of magnesium in the melt is gradually melting of the briquette. The upper part of the briquette which is not in contact with the melt acts as a "cold" screen and prevents the evaporation of volatile magnesium. Due to the higher degree of assimilation of magnesium oxygen content is reduced, which increases the ductility of the alloy and the output is in valid.When the content of molybdenum in alloys less than 90 wt. the evaporation of magnesium in the process proizvodsta of view, because it increases the flow of ligatures.We offer a ligature is prepared by compaction of powders of molybdenum and magnesium.P R I m m e R. 1. The mixture of the powder of molybdenum in the amount of 90 wt. and granules of magnesium in an amount of 10 wt. extruded in the shape of a ball weight of 100-500 gThe ligature was used in the smelting nickelchromium alloy doped with molybdenum in a vacuum induction furnace. The ligature was introduced for 5-10 minutes prior to casting, with all the bottoms in the number of input ligatures was calculated by shihtovom the content of magnesium, 0.03 wt.The ingots after turning forged on the rods with a diameter of 80 mm From each party (melting) taking samples to determine mechanical properties, oxygen content and output in valid.The properties of the samples are shown in the table.P R I m m e R 2. As in example 1 were prepared alloys with different content components. Properties obtained using ligatures alloy is given in table.The proposed ligature allows the deoxidation and the modification of heat-resistant alloys, alloyed with molybdenum, ensuring clean and safe production. The master ALLOYS FOR high-temperature Splacement, wt.Molybdenum 90 96
FIELD: powder metallurgy.
SUBSTANCE: parts of devices protecting against radioactive emission or electric contacts are proposed to be manufactured from tungsten/copper pseudoalloy. Tungsten powder is mixed with binder containing 0.5-1.5% colophony and 0.05-0.15% ammonium formate or citrate. Resulting mixture is compacted and resulting porous blanc is brought into contact with copper. The total is thermally treated by gradually raising temperature: first in vacuum to remove binder and to melt copper and then in argon atmosphere to 1360-1410оС.
EFFECT: increased wettability and uniformity of impregnation, and eliminated explosive risk due to excluded use of hydrogen.
3 cl, 1 tbl, 10 ex
FIELD: metallurgy, in particular molybdenum alloys of formula Mo-Si-B of improved oxidation resistance doped by iron, nickel, cobalt, copper or mixture thereof.
SUBSTANCE: invention relates to molybdenum-based alloy and its variants. Molybdenum alloy containing silicium and boron in disclosed, wherein said alloy comprises molybdenum with space-centered cubic lattice and intermetallic phases, as well as one from element compositions selected on the base of points on the next structural diagrams: metal alloy-Si 1.0 mass%-B 0.5 mass %; metal alloy-Si 1.0 mass %-B 4.0 mass %; metal alloy-Si 4.5 mass%-B 0.5 mass %; and metal alloy-Si 4.5 mass %-B 4.0 mass %. Said metal alloy contains molybdenum as the main component and additionally at least one element from group Fe, Ni, Co, Cu in amount of (mass %): Fe 0.01-2.0; Ni 0.01-2.0; Co 0.01-2.0; Cu 0.01-2.0. In another embodiment alloy composition is determined according to the next structural diagrams: Mo-Si 1.0 mass %-B 0.5 mass %; Mo-Si 1.0 mass %-B 4.0 mass %; Mo-Si 4.5 mass %-B 0.5 mass %; and Mo-Si 4.5 mass %-B 4.0 mass %. In additionally alloy contains 0.01-2.0 of at least one element from Fe, Ni, Co, Cu or mixture thereof. Claimed alloys have oxidation resistance at 12000C or above.
EFFECT: molybdenum-based alloys with high oxidation resistance.
3 cl, 3 dwg, 1 tbl, 1 ex
FIELD: mechanical engineering; methods of manufacture of the plates of the molybdenum alloy "ЦМ2А" used for the press forming.
SUBSTANCE: the invention is pertaining to the field of mechanical engineering and may be used at manufacture of the details of the electro-vacuum production (EVP) made out of the molybdenum alloy plates, in particular, of "ЦМ2А" brand by the press forming. The method provides for realization of the control over their mechanical properties during manufacture process, chipping of the samples, the vacuum annealing for removal of the strains caused by shipping. At that the annealing is fulfilled at the temperature of 650°С, and the control over the mechanical properties of the "ЦМ2А" plates is fulfilled by the random inspection of the samples hardness before and after the vacuum annealing and confirm preservation of the mechanical properties defined by the specification for the "ЦМ2А" plates by the calculations in compliance with the set dependences:δt =-174 + 3.745·HV, δ = 37.456 - 0.0848·HV, whereδt - the temporary resistance, n/mm2, δ - the relative elongation, %, HV - Vickers hardness (HV10). The technical result of the invention is conservation of the mechanical properties of the metallurgists delivered metal - the "ЦМ2А" plates till the moment of the press forming - draw, the possibility of stabilization and optimization of the production process for the metallurgists and the customers of the plates, the increased output of the suitable plates at the press forming, saving of the deficient metal, the increased reliability of the articles of the electro-vacuum production.
EFFECT: the invention ensures preservation of the metallurgists delivered metal mechanical properties till the moment of the press forming and draw, the possibility of stabilization and optimization of the production process for the metallurgists and the customers of the plates, the increased output of the suitable plates at the press forming, saving of the deficient metal, the increased reliability of the articles of the electro-vacuum production.
FIELD: manufacture of die tools for polymers.
SUBSTANCE: proposed alloy contains the following constituents, mass-%: molybdenum, 40.0-50.0; silicon, 0.3-0.5; iron, 5.0-10.0; manganese, 5.0-10.0; copper, 1.0-2.0; chromium, 5.0-10.0; niobium, 1.0-2.0; aluminum, 0.1-0.2; magnesium, 0.01-0.02; titanium, 0.1-0.2; zirconium, 0.1-0.2; boron, 0.3-0.5; carbon, 1.8-2.2; the remainder being nickel.
EFFECT: increased service life and improved quality of parts made from this alloy.
FIELD: powder metallurgy; composite materials for metal-ceramic seals.
SUBSTANCE: charge for composite material contains the following constituents, mass-%: molybdenum, 65-70; cobalt, 0.2-0.4; boron, 0.1-0.3; nickel, 0.2-0.4; sodium tetraborate, 0.2-0.4; the remainder being copper.
EFFECT: enhanced ductility of material.
1 tbl, 1 ex
FIELD: metallurgy, alloys.
SUBSTANCE: invention proposes molybdenum-base alloy of the following composition, wt.-%: zirconium, 0.8-1.2; carbon, 0.08-0.12; nickel, 0.8-1.2; aluminum, 0.1-0.2; hafnium, 0.4-0.8; nitrogen, 0.02-0.04; titanium, 0.1-0.2, and molybdenum, the balance. Proposed alloy shows the enhanced strength. Alloy is used in making critical section insertions, jets, articles for rockets and reactors, equipment and tools for metal working industry, articles for petroleum and glass industry, articles in radio engineering and electronic engineering.
EFFECT: improved and valuable properties of alloy.
FIELD: metallurgy, alloys.
SUBSTANCE: invention proposes alloy of the following composition, wt.-%: boron, 0.01-0.03; titanium, 0.3-0.5; nickel, 3-4; cobalt, 3-4; iron, 0.1-0.3, and molybdenum, the balance. Invention provides weldability of alloy. Proposed alloy is used in power machine engineering.
EFFECT: improved and valuable properties of alloy.
FIELD: manufacture of thermoemitters for surface ionization detectors and quantitative determination of content of organic compounds, such as amines, hydrazine and their derivatives.
SUBSTANCE: molybdenum-based mono-crystalline alloy contains iridium in the amount of 0.05-0.15 mass-% and ruthenium in the amount of 1.0-10.0 mass-%.
EFFECT: enhanced ionizing capacity and increased service life of thermoemitter.