(57) Abstract:The invention relates to the field of magnetic materials, namely, magnetic alloys based on rare-earth metals. The obtained magnetic alloy with high magnetic induction, containing holmium and praseodymium in the following ratio of components, at.%: the holmium the 98.9 99,0,praseodymium 1,0 - 1,2 and I. Allestimenti. This invention relates to the production of magnetic alloys based on rare-earth metals.II. The prior art. Currently known on the basis of Ho alloys: Ho; Fe-B-Ho; Ho-Fe-Co.2. Boyar L. A., Elderly M. A. - FTT, 1972, T. 14, N 6, S. 1833-1835.2. Baselines C. G., L. Boyarsky A., Muraviev C. M. - the book "Materials 21 all-Union conference on low temperature physics" - Kharkiv, Ukraine, ILTPE USSR Academy of Sciences, 1980, so 2, S. 60-62.3. Patent 4769063, USA, class C 22 C 1/04 published 06.09.88.4. Boyar L. A. - the book "Alloys of rare earth metals with special physical properties", Publishing house "Nauka", Moscow, 1983.5. Patent 1-42338, Japan, class C 22 C 1/04 published 09.12.89.However, all known alloys have insufficient magnetic induction.Technical sadcase, containing Ho, additionally introduced Pr respectively from 1.0 to 1.2 at.%.III. To confirm the achievement of the technical objectives, the following examples:
For the manufacture of single crystal alloys method was used for recrystallization annealing of deformed crystals, which used the seed, oriented along the direction of <0001> relative to the growth axis at an angle of 12o. The grown single crystals represented ingots with a diameter of 50 mm and a thickness of 6-8 mm, which contained 4 - 5 large blocks.Lauerma - polychromatic x-ray snapshot of a stationary crystal. To obtain radiographs used the camera RXO. The sample on the camera strengthens on the goniometric head. A narrow beam of x-rays were cut collimator. A diffraction pattern was recorded on film, and located perpendicular to the selected collimator primary x-ray beam.The goniometric head is allowed to rotate the crystal by arcs head 60owith exact reference angle (10').The location of the diffraction spots on the image determined by the location of the reflecting planes of the crystal against the TCI Wolfe was defined crystallographic directions.Estimate of the distribution component of the single crystals was carried out using a "Cameca". To find the concentration distribution of the components was determined by the content of Ho - Pr and Pr 3-4 points along the length and width of the crystal.The maximum deviation from the average concentration was 0.1 at.% for each sample.Thus, the grown crystals had a fairly uniform distribution of the component volume.Thus, the composition of the alloy:
1. Ho98,8Pr1,2its magnetic induction equal to I = 38,4 kg;
1. Ho99,0Pr1,0its magnetic induction equal to I = 36,5 kg;
1. Ho99,5Pr0,5its magnetic induction equal to I = 34,7 kg.The invention relates to the production of magnetic materials, with record values of the magnetic induction. That opens the possibility to use these alloys in vacuum, electronic, nuclear, aeronautical engineering, computer engineering, metallurgy and many other industries and the national economy. Magnetic alloy containing Ho, characterized in that it additionally contains a Pr in the following ratio of components, at.%:
FIELD: metallurgy; metallohydride alloys for thermal pumps, air-conditioners, cold generators.
SUBSTANCE: proposed metallohydride pair of alloys contains low-temperature and high-temperature alloys; low-temperature alloy has composition mm1-xLaxNi4CO(0.1≤x≤0.999) and high-temperature alloy has composition LaNi5-xAlx (0.001≤x≤0.5).
EFFECT: increased cold generating capacity of thermal pump at pressure in system not below atmospheric.
2 tbl, 1 ex
FIELD: non-ferrous metallurgy; methods of production of scandium-containing ligatures.
SUBSTANCE: the invention is pertaining to the field of non-ferrous metallurgy. The method of production of scandium-containing addition alloys includes a metallothermic restoration in halogenide melts. According to the invention the halogenide melt containing 1.0-1.4 mass % of scandium oxide is added with 1.4-1.7 mass % of zirconium oxide and conduct restoration by an alloy of aluminum with magnesium at the ratio of the halogenide melt to the aluminum-magnesium alloy from 1.2 up to 1.6. The technical result of the invention is production of a synthesized addition alloy containing scandium and zirconium with the maximal strengthening effect, decreased value of the produced addition alloy (by 30-40 %) due to decrease of consumption of the cost intensive scandium oxide by 50 %.
EFFECT: the invention ensures production of a synthesized scandium and zirconium ligature with maximal strength, allows to decrease significantly its production cost and consumption of expensive scandium oxide.
1 tbl, 1 ex
FIELD: compression refrigeration machines.
SUBSTANCE: regenerative material is defined by the formula R2O2S, where R represents at least one of rare-earth elements such as La, Ce, Pr, Nd, Sm, Eu, Cd, Tb, Dy, Ho, Er, Tm, Yb, Ly, and Y. The regenerator provided with nozzle made of regenerative material on the basis of rare-earth metal oxysulfide comprises oxysulfide of rare-earth metal defined by the formula R2O2S.
EFFECT: prolonged service life.
25 cl, 8 dwg, 17 tbl, 28 ex
SUBSTANCE: films and coatings made form proposed alloy can be used in the capacity of corrosion-resistant elements of control systems in precision instrument making, in the form of thin resistive films and coatings of circuit elements of resistance, operating at influence of corrosive mediums. Invention is directed to achievement of high corrosion stability in sea-water and increasing of processing characteristics at application of films and coatings. Optimal by achieved effect is alloy at following correlation of components, wt %: chrome 20.0-25.0; zirconium 5.0-9.0; cerium 0.1-0.9; germanium - the rest. Characteristics of proposed alloy: corrosion stability 0.001-0.005 mm/year, adhesion of films 8-12 MPa, cohesion of films 6.5-10.2 MPa. Films correspond nano-structured system with separation of nanoparticles of size from 30 up to 150 nm.
EFFECT: development of precision alloys with particular physicochemical properties, operating in corrosive mediums.
2 cl, 1 tbl
SUBSTANCE: method includes treatment of contact surfaces to remove oxide film, heating of contact surfaces and application of metal coating from gallium alloy by local contact melting. Removal of oxide film is made by chemical treatment of contact surfaces with the first etching solution with its subsequent neutralisation and cleaning of contact surfaces from etching results. Then mechanical cleaning of contact surfaces is carried out by polishing, afterwards contact surfaces are heated, metal coating of gallium alloy is applied in the medium of the second etching solution, and subsequent neutralisation of remains of the second etching solution is carried out.
EFFECT: improved loading capacity of knock-down electric contact joint during transfer of electric energy without change in design of contact joint, while the temperature mode of operation is within the permissible limit.
8 cl, 2 ex
SUBSTANCE: according to procedure there is used source charge containing sodium fluoride, potassium chloride, scandium oxide or fluoride, aluminium fluoride, hydro-fluoride of potassium and oxy-fluoride of zirconium and/or hafnium. Charge is mixed with metal aluminium to maintain weight ratio of components of charge to aluminium, as 1:0.8-1.1. Produced mixture is loaded into a crucible and is heated to temperature 800-900°C. Further, there is carried out alumino-thermal reduction at melt mixing. Melt is conditioned during 15-30 min and salt melt and liquid metal are poured separately into moulds. Source charge contains components at the following ratio, wt %: oxide or fluoride of scandium 4.3÷12.0, aluminium fluoride 5.0÷8.0, sodium fluoride 14.5÷18, potassium hydro-fluoride 1÷3, zirconium and/or hafnium oxy-fluoride 8÷15.4, potassium chloride - the rest.
EFFECT: improved modifying effect of alloying components, simplified process and reduced rotation of salts.
2 cl, 6 ex, 1 tbl
FIELD: process engineering.
SUBSTANCE: invention relates to soldering by gallium-based diffusion-curable solder and can be used for making permanent bonds of different materials, in particular, for low-temperature flux free soldering of metals and ceramics with metals. Solder to this end comprises copper, gallium and tin. Note here that it contains copper with particle size of 25-45 mcm and gallium-tin alloy at definite ratio of components.
EFFECT: low-viscosity high setting rate solder for flux-free soldering.
SUBSTANCE: proposed active material contains the alloy of composition formula SixTiyZnz, where each of x, y and z is the mass percent content satisfying the relationship x+y+z=100, 38≤x<100, 0<y<62 and 0<z<62. Negative electrode comprises said active material. Electric device represents a storage battery with active material of negative electrode.
EFFECT: high initial capacity at high cycling characteristics.
10 cl, 10 dwg, 1 tbl, 2 ex