Effects of Inert Nanoparticles of High-Melting-Point Compositions on Grain Structure and Strength of Ni[3]Al Intermetallic Compounds

The paper represents experimental findings both in the area of effects of nanoparticles of inert high-melting-point TiN compounds on a Ni[3]Al intermetallic grain structure creation in the conditions of high temperature synthesis under pressure, and in the area of impact of grain structure modification on intermetallic compounds' strength factor temperature dependence. It was demonstrated that appending a stoichiometric composition of nanosized particles of high-melting-point inert chemical compounds (TiN) initiates a manyfold loss of average size of grain of Ni[3]Al intermetallic compounds, synthesized under pressure, as well as a sufficient intermetallic compounds' strength rise within a wide range of temperatures (up to 1 000 degree C). Electron-microscopic evaluations of a synthesized intermetallic structure with TiN nanoparticles, showed that, during the process of intermetallic polycrystalline structure creation from high temperature synthesis products melts, TiN nanoparticles are mainly spread throughout the boundaries and joints of grain structure, acting as stoppers of grain boundaries migration

Effects of Inert Nanoparticles of High-Melting-Point Compositions on Grain Structure and Strength of Ni[3]Al Intermetallic Compounds

The paper represents experimental findings both in the area of effects of nanoparticles of inert high-melting-point TiN compounds on a Ni[3]Al intermetallic grain structure creation in the conditions of high temperature synthesis under pressure, and in the area of impact of grain structure modification on intermetallic compounds' strength factor temperature dependence. It was demonstrated that appending a stoichiometric composition of nanosized particles of high-melting-point inert chemical compounds (TiN) initiates a manyfold loss of average size of grain of Ni[3]Al intermetallic compounds, synthesized under pressure, as well as a sufficient intermetallic compounds' strength rise within a wide range of temperatures (up to 1 000 degree C). Electron-microscopic evaluations of a synthesized intermetallic structure with TiN nanoparticles, showed that, during the process of intermetallic polycrystalline structure creation from high temperature synthesis products melts, TiN nanoparticles are mainly spread throughout the boundaries and joints of grain structure, acting as stoppers of grain boundaries migration

Influence of the Thermal-force Effect on the Process of Hightemperature Synthesis of the Ni[3]Al Intermetallic Compound

In this work, the intermetallic compound Ni[3]Al was obtained by high-temperature synthesis under pressure at various values of the preliminary pressure on the initial powder mixture (3Ni+Al). The study of pressure-time and displacement-time diagrams gave a coherent picture of the synthesis passage over time. It was found that an increase of preliminary pressure leads to a decreasing of the powder compacts porosity. In this regard, the smallest displacement of the press plunger after initiating the synthesis reaction in the powder compact was observed at the highest value of the preliminary pressure on the compact. The role of preliminary pressure on the initial powder mixture in the process of the grain structure formation of the Ni[3]Al intermetallic compound synthesized under pressure was determined

Analysis of the demand for environmental technologies in hotels

The article presents the concept of an ecological hotel, which justifies the need for development taking into account the environmental literacy of service consumers and solving environmental problems. The authors analyse the concepts of “eco-hotel”, “eco-technologies”, the content of which is focused on the careful attitude to natural resources, innovative “green” technologies that operate on the principle of environmental responsibility. The paper considers two types of ecological hotels in Russia and abroad, located in natural (rural) areas and urban environment and gives their characteristics. The authors consider the results of the study obtained in relation to the choice of eco-technologies in hotels by consumers. The paper confirms the formulated hypotheses. The article traces the relationship between the environmental awareness of service consumers and the choice of eco-technologies in hotels

ЭФФЕКТ ВОЗДЕЙСТВИЯ 1,5-БИС(3,5-ДИМЕТИЛПИРАЗОЛ-1-ИЛ)-3-ОКСАПЕНТАН-ДИАЦЕТАТОМЕДИ НА ОБЩЕЕ СОСТОЯНИЕ ОРГАНИЗМА КРЫС В УСЛОВИЯХ ЭКСПЕРИМЕНТА

Многие производные пиразола проявляют разнообразные фармакологические свойства. Им характерны антиоксидантная, антивирусная активность, противовоспалительные, иммуномодулирующие свойства, а также антидепрессивный и противоопухолевый эффекты. Данная работа основана на результатах морфометрических показателей массы тела и печени и биохимического анализа крови здоровых взрослых самцов белых крыс после однократного и многократного внутрибрюшинного введения 1,5-бис(3,5-диметилпиразол-1-ил)-3-оксапентан-диацетатомеди, растворенного в свежеприготовленном физиологическом растворе (доза 12 мг / кг массы тела). Результаты исследования показали, что при введении препарата в организм крыс проявляются различные эффекты. Установлено, что исследуемое вещество имеет гипогликемический эффект, о чем свидетельствует снижение уровня глюкозы в крови и увеличение количества гликогена в печени. Антилиполитический его эффект подтверждается снижением уровня свободных жирных кислот в крови. Токсическое воздействие препарата проявляется повышением уровня печеночных ферментов аланин аминотрансферазы и аспартат аминотрансферазы, а также снижением уровня альбумина в сыворотке крови и уменьшением массы тела и печени. Эти эффекты проявляются и сохраняются только при многократном ежедневном применении этого препарата в течение 6 недель

Impact of High-Temperature, High-Pressure Synthesis Conditions on the Formation of the Grain Structure and Strength Properties of Intermetallic Ni[3]Al

The impact of the preliminary load on 3Ni+Al powder mixture and the impact of the duration of the delay in application of compacting pressure to synthesis product under the conditions of continuous heating of the mixture up to its self-ignition on the grain size and strength properties of the synthesized Ni[3]Al intermetallide material have been studied. The grain structure of the intermetallide synthesized under pressure was studied by means of metallography, transmission electron microscopy and EBSD analysis, with the dependence of ultimate tensile strength on the grain size in the synthesized intermetallide having been investigated at room temperature and at temperatures up to 1000°С. It is shown that an increase in the pressure preliminarily applied to the initial mixture compact results in reduced grain size of the final intermetallide, whereas an increase in pre-compaction time makes the grain size increased. A decrease in the grain size increases the ultimate tensile strength of the intermetallide. The maximum value of the ultimate tensile strength in the observed anomalous temperature dependence of this strength exhibits a shift by 200°С toward higher temperatures, and the ultimate strength of the synthesized intermetallide at 1000°С increases roughly two-fold