Articles

 

Heat-resistant materials

1.
№2, 2017
УДК 666.7
Ivakhnenko Yu.A.1, Varrik N.M.1
  • [1] Federal State Unitary Enterprise All-Russian Scientific Research Institute of Aviation Materials State Research Center of the Russian Federation
  • Fibrous gradient ceramic material
    The development of modern engineering and industrial technologies aims to develop new materials that can meet ever more severe conditions. One of these conditions is the ability to work at high temperatures, so one of the important materials is the high temperature insulation. Requirements for the insulation materials include first high thermal properties, namely high temperature resistance and low coefficient of thermal conductivity; and the minimum specific weight, chemical resistance, mechanical strength, elasticity and other performance properties relevant to their technological and environmental safety. In this work we try to create a high-temperature thermal insulation material for insulation of metal energy device cases, operating at temperatures above 1500°С. The use of structural ceramic materials in conjunction with metal parts requires the use of a material that has the ability to absorb strain caused by the difference between the coefficients of thermal expansion constructi
    Keywords: oxide fiber, gradient material, heat insulation.


    2.
    №1, 2017
    УДК 666.7
    Maksimov V.G.1, Varrik N.M.1
  • [1] Federal State Unitary Enterprise All-Russian Scientific Research Institute of Aviation Materials State Research Center of the Russian Federation
  • To question of receiving chemically resistant quartz ceramics with open porosity
    Ceramic materials are used in many areas of modern industry. In recent decades ceramic materials in many applications replaced metals and alloys. Porous ceramics finds application as heat insulation, is used as ceramic filters for the filtration of hot gases, liquids and molten metal, and also as a substrate of catalysts. The porosity of ceramics depends on its function and is achieved by various methods of its fabrication. In this paper, the possibility of making sensors for PH meters of porous ceramics are studied. Methods for fabrication of the samples and their properties are described.
    Keywords: porous ceramic, quartz, heat resistance, chemical durability.


    3.
    №3, 2016
    УДК 621.186.4
    Varrik N.M.1
  • [1] Federal State Unitary Enterprise All-Russian Scientific Research Institute of Aviation Materials State Research Center of the Russian Federation
  • Thermal insulation materials for modern planes
    Data on flexible heat-insulating materials for aircraft, their main characteristics and methods of their receiving are provided in the article. Development of sound thermal insulation materials for planes with the lowered specific weight, high operational properties and meeting the requirements of fire safety is one of actual tasks for developers of materials now. Ensuring reliable work of thermal insulation in the conditions of cyclic thermal loadings and vibrations and an opportunity to resist to extreme heatings in ignition cases – an important task during creation of materials for perspective planes. This article presents the review of the types of thermal insulation and methods of increase of its operational properties existing now at the market.
    Keywords: thermal insulation, fire barrier, fire blocking, acoustical insulation mat, heat-resistant fiber.


    4.
    №1, 2016
    УДК 66.017
    Studying the phase formation processes and sintering of aluminum silicate glass-ceramics, synthesized by sol-gel method, and composite materials based on it, with high dilatometry, differential scanning calorimetry, electron microscopy and x-ray analysis
    Using sol-gel method, spark plasma sintering and hot pressing the powders of Sr-anorthite glass-ceramics and composite materials on its basis are synthesized. The phase for-mation processes and sintering proceeding at their synthesis are studied. Work is carried out within implementation of the complex direction 14.1 «Constructional ceramic composite materials (CCM)» («The strategic directions of development of materials and technologies of their processing for the period till 2030»)
    Keywords: composite materials, Sr-anorthite, glass-ceramics, sol-gel, silicon nitride, spark plasma sintering


    5.
    №4, 2015
    УДК 621.791
    V.G. Shmorgun1
  • [1] Federal state budgetary educational institution of higher professional education «Volgograd state technical university»
  • INTERACTION OF ALUMINUM AND NICKEL IN CONTACT FUSION
    The article examines the processes of liquid-phase interaction in layered intermetallic nickel-aluminum composite material. The study was performed on obtained by the explosion welding samples of composite material nickel AD1+NP2 (4+4 mm) after isothermal heat treatment. As a result of the interaction of nickel with the molten aluminium in the heat treatment the structure of crystallized melt becomes a matrix with dispersed intermetallic inclusions NiAl3 in the solid solution on the aluminum basis. On the nickel side diffusion zone consists of two layers of aluminide NiAl3 and Ni2Al3. The increase of temperature and time of liquid-phase interaction leads to an increase in total thickness of the diffusion zone and concentration of NiAl3 crystallized in an aluminum melt.
    Keywords: layered composite material, intermetallic, phase composition, microhardness, diffusion zone.


    6.
    №4, 2015
    УДК 669.018.44:669.245
    ABOUT THE INFLUENCE OF THE FRACTIONAL COMPOSITION OF SPHERICAL-SHAPED PARTICLES OF SUPERALLOYS ON THE PRESENCE IN A COMPACTED MATERIAL STRUCTURAL ANOMALY NAMELY THAT INDIVIDUAL IN SPHERICAL-SHAPED PARTICLES RETAIN THE SIGNS OF THE CAST STRUCTURE
    The article examines the relationship between the difference in the temperature of Y'-phase complete dissolution in the spherical-shaped particles of various sizes of superalloys and anomaly patterns of HIP-material, namely that individual spherical-shaped particles in HIP-material retain the signs of the cast structure after HIP.
    Keywords: powder metallurgy, molded structure, superalloys.


    7.
    №4, 2015
    УДК 669.018.44
    Bondarenko Yu.A.1, Yechin A.B.1, Kolodyazhny M.Yu.1
  • [1] Federal State Unitary Enterprise All-Russian Scientific Research Institute of Aviation Materials State Research Center of the Russian Federation
  • MODERN RESEARCH IN THE FIELD OF TECHNOLOGY OF MELTING AND CRYSTALLIZATION FOR THE FORMATION OF THE NATURAL COMPOSITE STRUCTURE IN A HIGHLY TEMPERATURE-RESISTANT ALLOYS BASED ON NIOBIUM-SILICON FOR DETAILS OF THE HOT PATH OF GAS TURBINE ENGINES
    Actual engine design due to the creation with new highly heat resistant material, especially for blades and other components of gas turbine engines. An analysis of the scientific and technical documentation that the and development of high-temperature composite materials based on niobium and niobium-silicon hardening phases involved in a number of major countries, including Russia, US, Germany, France, Britain, China, Japan. The study identified the main development trends in this area and the main indicators of the level of technical development.
    Keywords: directional solidification; gas turbine engine; superalloy; niobium; in-situ composite structure.