Articles

 


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1.
dx.doi.org/ 10.18577/2307-6046-2014-0-9-1-1
УДК 669.018.44:669.245
Min P.G., Sidorov V.V.
REFINING OF SCRAPS OF Ni-BASE SUPERALLOY ZhS32-VI TO ELIMINATE SILICON IMPURITY UNDER CONDITIONS OF VACUUM INDUCTION MELTING

Possibility of reduction of the silicon content in ZhS32-VI alloy by combined intro-duction of AEE and REE additions followed by filtration of the melt through the ceramic foam filter with activated working surface from CaO. It was established that filtration rate influences the completeness of removal of nonmetallic inclusions from the melt. The effective use of yttrium for Ni-base melt refining from silicon impurity was demonstrated.

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2.
dx.doi.org/ 10.18577/2307-6046-2014-0-9-2-2
УДК 669.245.018.44:629.7
Bazyleva O.A., Turenko E.Yu., Shestakov A.V.
AN EFFECT OF HEAT TREATMENT ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF NIAL-BASED INTERMETALLIC ALLOY

The results of investigation of heat treatment influence on microstructure and me-chanical properties of NiAl-based alloy are presented in the paper. Tensile strength and elongation of NiAl-based alloy at room temperature reached their top values owing to heat treatment (TS=120°С/2 h) followed by ageing.

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3.
dx.doi.org/ 10.18577/2307-6046-2014-0-9-3-3
УДК 629.7.023.224
Gayamov A.M., Budinovskiy S.A.
STUDY OF AN EFFECT OF THICKNESS OF THE BARRIER COATING LAYER ON PROPERTIES OF COMPOSITIONS OF HIGH-TEMPERATURE ALLOYS VZhM1 AND ZhS36 WITH HEAT-RESISTANT COATINGS

An influence of the thickness of the composite barrier layer [SDP-2+CrC] on heat resistance and kinetics of changes in elemental compositions of VZHM1 and ZHS36 superalloys with heat-resistant coating. Microstructural investigations of «nickel super-alloy–coating» compositions were carried out after the heat resistance test. It has been established that an increase in thickness of the barrier layer reduces significantly diffusion rate of elements across the «nickel superalloy–coating» interface, but the use of barrier layers with the thickness of 20 microns or more leads to a premature detachment of the coating from the substrate. The obtained results allow us to recommend the use of [SDP-2+CrC] barrier layer of 10–15 microns in thickness as a part of the heat-resistant coating.

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4.
dx.doi.org/ 10.18577/2307-6046-2014-0-9-4-4
УДК 621.775.8
Migunov V.P., Farafonov D.P., Degovets M.L.
ABRADABLE SEALING MATERIAL MADE OF FIBERS FROM COPPER ALLOYS

Possibility of creation of abradable sealing material from metal fibers with high op-erational properties, workable in GTE compressor with blades and stator parts made of titanium alloys was investigated. Usage of discrete fibers from copper alloys as an initial material for abradable seals of radial gap in compressor has been offered.

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5.
dx.doi.org/ 10.18577/2307-6046-2014-0-9-5-5
УДК 677.4
Shcheglova T.M., Zimichev A.M., Varrik N.M.
RESEARCH OF SAMPLES OF THE CORD FROM «FIBERFRAX» FIBERS

Samples of a cord produced by a foreign company were investigated for high-temperature use. Appearance and cord structure, threads of the first and second type as a part of a cord were investigated. In addition, the structure of threads of the first and second type was studied by binocular microscope, SEM and RFA. The linear density of thr cord and its components was determined. The analysis of behavior of samples of threads of the first and second type after calcining at various temperatures was carried out (loss of weight, RFA, SEM, an optical microscope). As a result of the conducted re-search it was found out that for production of Ø8 mm cord with linear density of 18 ktex, two types of threads were used: two threads of 3 mm in diameter with glass fabric warp were used as the core and six threads of ~1.5 mm diameter, reinforced with metal wire as the braid. Each of threads, i.e. the thread of the first type (with the wire) and the thread of the second type (with glass fabric), cons

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6.
dx.doi.org/ 10.18577/2307-6046-2014-0-9-6-6
УДК 678.83
Shuldeshova P.M., Zhelezina G.F.
THE ARAMID LAYERED AND WOVEN MATERIAL FOR PROTECTION AGAINST IMPACT AND BALLISTIC INFLUENCES

Article is devoted to research of the aramid layered and woven material intended for protective structures, in particular for reinforcements of the fan frame of an aviation turbojet. The material will provide the impenetrability of the frame in case of fan blades failure. An influence of composition and structure of the layered and woven material on its impact and ballistic resistance is considered.

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7.
dx.doi.org/ 10.18577/2307-6046-2014-0-9-7-7
УДК 678.8
Beider E.Ya., Petrova G.N., Izotova T.F.
AN INFLUENCE OF COUPLING AGENT ON PROPERTIES OF THERMOPLASTIC GLASS REINFORCED PLASTICS

Results of investigation of coupling agents chosen for glass fiber reinforced plastics (GFRP) on the basis of thermoplastic heat-resistant binder - polysulfone PSU-150 aimed to get polymer composite materials with advanced properties is given. The influence of such coupling agents as epoxy resins solutions with different epoxy equivalent, rolivsan, furfuryl alcohol, polysulfone etc. was investigated. Mechanical properties of GFRP are shown as a dependence on coupling agent’s na-ture and its quantity. Fireproof characteristics (combustibility, smoke density, heat release) of the developed thermoplastics GFRP and their accordance to domestic (AP-25) and foreign (FAR-25) requirements are considered. It is shown that coupling agent’s nature does not effect on combustibility and smoke density of GFRP but has an influence on their heat release. Recommendations on the use of thermoplastic GFRP based on polysulfone PSU-150 binder are given.

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8.
dx.doi.org/ 10.18577/2307-6046-2014-0-9-8-8
УДК 629.7.023
Solncev S.St., Solovyova G.A., Denisova V.S.
INSULATING ENAMEL COATINGS FOR MODERN ELECTRONICS

Possibility of development of insulating enamel coatings for substrates based on glass and ceramics is shown. The optimum compositions of insulating enamel coatings in phosphate and zinc borosilicate glass forming systems are chosen. Tests of chemical resistance have showed a high stability of the synthesized glasses. Enamels have high insulating properties. Maximum surface resistance of samples is 7.29·1014 Оhm•сm.

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9.
dx.doi.org/ 10.18577/2307-6046-2014-0-9-9-9
УДК 629.7.023
Karimova S.A., Kozlov I.A., Volkov I.A.
INCREASE OF PROTECTIVE PROPERTIES OF NONMETALLIC INORGANIC COATINGS ON MAGNESIUM ALLOYS

The efficiency to improve protective properties of inorganic non-metallic coatings applied on magnesium alloys by impregnation with organic compounds (polyamide lac-quers and anaerobic compositions) was investigated. The efficiency of different impreg-nation methods – vacuum impregnation, dipping, application with a brush, as well as the possibility of using available impregnating materials were studied. The efficiency of the impregnation of non-metallic inorganic coatings on parts made of magnesium alloys was shown. Different methods such as gravimetric, immersion in NaCl solution, exposure in tropical climate chamber was used to determine protective properties of coatings.

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10.
dx.doi.org/ 10.18577/2307-6046-2014-0-9-10-10
УДК 678.632
A.I. Samatadze, Parakhin I.V., A.S. Tumanov
SOLID RESOL-NOVOLAK RESINS AND COMPOSITION ON THEIR BASED

The present article is devoted to receiving the combined polymers based on the mixed resol-novolak resins. As a result of the carried-out researches technological properties (viscosity, cured and other) of the combined polymers on the basis of the mixed resol-novolak compositions and also their heat resistance were determined. It is shown that introduction of novolak oligomer in composition on the based of solid resol resins leads to reducing the viscosity of the composition that simplifies carrying out technological process of their receiving. This fact greatly simplifies the technological process. At the same time, studying of kinetics of thermal decomposition of studied compositions has allowed to identify that additives of novolak oligomer have certain thermostabilizing effect on decrease in speed of destruction of the mixed resol-novolak compositions. Durability of the carbon residue of the received compositions also significantly increases in comparison with initial systems.

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11.
dx.doi.org/ 10.18577/2307-6046-2014-0-9-11-11
УДК 620.178.35
Belyaev M.S., Khvatskiy K.K., Gorbovets M.A.
COMPARATIVE ANALYSIS OF NATIONAL STANDARDS OF RF AND THE USA ON METHODS OF METALS FATIGUE TESTING

A comparative analysis of national standards of RF and the USA on test methods of low-cycle fatigue (LCF) and high-cycle fatigue (HCF) was carried out in this work. The following national standards were considered: RF standard GOST 25.502–79, last revi-sion in 1985, «Strength analysis and testing in machine building. Methods of mechanical testing of metals. Methods of fatigue testing» and two national standards of the USA – ASTM E466–07 «Standard Practice for Conducting Force Controlled Constant Am-plitude Axial Fatigue Tests of Metallic Materials» and ASTM E606–04 «Standard Prac-tice for Strain-Controlled Fatigue Testing». It was shown that there is no noticeable difference between gage sizes of specimens in the standards mentioned above. As compared with GOST, ASTM E standards specify additional high requirements to specimen surfaces and to loading errors. Thus, National standard of RF GOST 25.502–79, last revision in 1985, has to be essentially modified.

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12.
dx.doi.org/ 10.18577/2307-6046-2014-0-9-12-12
УДК 543.272.51
Mekhanik E.A., Min P.G., Goundobin N.V., Rastegayeva G.Yu.
DETERMINATION OF SULFUR MASS FRACTION IN HEAT RESISTANT NICKEL ALLOYS AND STEELS WITHIN THE CONCENTRATION RANGE FROM 0.0001 TO 0.0009% wt.

Sulfur mass fraction in heat-resistant nickel alloys and steels was determined by using infrared absorption of sulfur dioxide SO2 formed during combustion of samples with flux (catalyst) by oxygen flow in the induction furnace of gas analyzer LECO CS-444. A new composition of catalyst for full sulfur extraction from the analyzed alloys was chosen in this work. The catalyst consists of 1 g of flux LECOSEL II HP and 0.5 g of tin. The minimum time of the analysis required for full sulfur extraction was chosen. The possibility of sulfur content determination in heat-resistant nickel alloys and steels with in concentrations range from 0.0001 to 0.0009% wt. is shown.

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