Nano-reinforced Quartz Composites

We have studied the process of interaction between the components in the system «β-SiO2–Fe3O4–Na2O» in the temperature range from 20 to 1100 °C. Nano-reinforced composite building materials were developed on the base of quartz raw material. Developed materials are produced by low-temperature cal-cining technology. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3524

Nano-reinforced Quartz Composites

We have studied the process of interaction between the components in the system «β-SiO2–Fe3O4–Na2O» in the temperature range from 20 to 1100 °C. Nano-reinforced composite building materials were developed on the base of quartz raw material. Developed materials are produced by low-temperature cal-cining technology. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3524

Features of Investigations of Multilayer Nitride Coatings Based on Cr and Zr

The studies of the structure and properties of nanoscale multilayer coatings of Zr- and Cr-based refractory metals obtained by the vacuum arc cathode deposition are summarized in a brief review of the literature data. A comparative analysis of the microstructure and properties of ZrN/CrN composite coatings depending on the deposition conditions (constant negative potential of the substrate, pulsed high-voltage bias potential, partial pressure, reaction gas velocity) and modulation period for multilayered structure is carried out. General regularities consisting in the presence of the columnar structure and the growth texture are revealed. They show that there is a prevailing (111) orientation for investigated coatings. Conditions for obtaining improved physical, mechanical, and tribological properties of the coatings are determined.В кратком обзоре литературных данных обобщены результаты исследований структуры и свойств наномасштабных многослойных покрытий нитридов тугоплавких металлов на основе Zr и Cr, полученных методами вакуумно-дугового осаждения катода. Проведён сравнительный анализ микроструктуры и свойств композиционных покрытий ZrN/CrN в зависимости от условий осаждения (постоянного или импульсного отрицательного потенциала подложки, импульсного высоковольтного потенциала смещения, парциального давления, скорости потока рабочего газа) и периода модуляции многослойной структуры. Выявлены общие закономерности, состоящие в наличии столбчатой структуры и текстуры роста. Показано, что для исследуемых покрытий имеет место преимущественная ориентация (111). Установлены условия получения улучшенных физико-механических и трибологических характеристик покрытий.У короткому огляді літературних даних узагальнено результати досліджень структури та властивостей наномасштабних багатошарових покриттів тяжкотопких металів на основі Zr та Cr, одержаних методами вакуумно-дугового осадження катоди. Проведено порівняльну аналізу мікроструктури та властивостей композиційних покриттів ZrN/CrN, залежно від умов осадження (постійного неґативного потенціялу підложжя, імпульсного високовольтного потенціялу зміщення, парціяльного тиску, швидкости потоку робочого газу) та періоду модуляції багатошарової структури. Виявлено загальні закономірності, що полягають у наявності стовпчастої структури та текстури росту. Показано, що для досліджуваних покриттів має місце переважна орієнтація (111). Визначено умови одержання поліпшених фізико-механічних і трибологічних властивостей покриттів

High Entropy Alloys Based on Nitrides of Refractory Metals – a New Solution for Protective Coatings on the Instruments Working at High Temperatures

The coatings based on (Ti-Al-Zr-Nb-Y)N and (Ti-Zr-Hf-V-Nb-Ta)N were obtained by means of vacuum-arc deposition from the cathodes based on Ti+Al+Zr+Nb+Yand Ti+Zr+Hf+V+Nb+Tasystems in the atmosphere of nitrogen. Their physical and mechanical properties, as well as tribotechnical characteristics have been studied. The coatings are characterized by a columnar structure and their hardness reaches 51.02GPa. The adhesion strength of the coatings has also been studied, the coefficient of friction of the system “coating – Al2O3“ is 1.1.The results of tribological tests at high temperature showed that at 460 °C coatings had greater wear resistance, lower coefficient of friction compared to similar tests of coatings at 20 °C.These coatings are perspective as protective coatings for friction pairs and cutting tools

Foam-Glass Modified By Technological Nano-additive

Investigations have been conducted to study the effects of man-made nano-additive on basic physical and mechanical properties of foamed glass. As the main raw material used tare and flat glass. It was investigate the effect of nano-additive on structural features of the resulting foam glass at a temperature of 850 °C

Super Heavy Nano Reinforcing Concrete

The properties of modern heat resistant super heavy concrete reinforced by chrysotile nanotubes are described. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3522

Perspectives of application of nanotubes in modern composite building materials

There are described the perspectives of application a carbon and hydro silicate nanotubes in modern compositional materials. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/2063

Comparing the Tribological Properties of the Coatings (Ti-Hf-Zr-V-Nb-Ta)N and (Ti-Hf-Zr-V-Nb-Ta)N + DLC

The paper compares the tribological characteristics of the coatings (Ti-Hf-Zr-V-Nb-Ta)N and (Ti-Hf-Zr-V-Nb-Ta)N + DLC obtained by means of vacuum-arc deposition method. Coefficients of friction for nitride coatings (Ti-Hf-Zr-V-N-Ta)N have an average value of 1.06; for nitride coatings with DLC the value was 0.5 in the beginning, and then decreased to 0.14. To achieve high performance for functional coatings consisting of two layers - the bottom - and top-nitride DLC it is necessary to ensure the formation of a layer of solid lubricant in the areas of actual contact while retaining the structure of the coating

Foam-Glass Modified By Technological Nano-additive

Investigations have been conducted to study the effects of man-made nano-additive on basic physical and mechanical properties of foamed glass. As the main raw material used tare and flat glass. It was investigate the effect of nano-additive on structural features of the resulting foam glass at a temperature of 850 °C