Improving the Efficiency of Turning Processing of Heat-Resistant Alloys by Introducing Ultrasonic Field Energy into the Cutting Zone

Studies have been carried out to assess the effectiveness of dry processing by the current preparations from the heat-resistant alloy CN45MVTUBR with mineral ceramic incisors with the introduction of the ultrasound-field energy treatment zone. It has been established that the use of ULTRASOUND in the rough treatment of mineral ceramic tools without coolant allows to reduce the depth of the defective layer in 1.5 times.

THE FORMATION OF REINFORCING FILLERS IN A POLYMER MATRIX BY SOL-GEL METHOD

В работе изучены способы формирования наночастиц диоксида кремния и диоксида титана золь-гель методом в молекулярной сетке полимера. Для этого проводили гидролиз тетраэтоксисилана и тетрабутоксититана в ультразвуковом поле. Продукты выделяли, термически обрабатывали для удаления побочных продуктов и воды и изучали методами оптической микроскопии, ИК-спектроскопии, совмещенным дифференциально-термическим и термогравиметрическим анализом. В результате получены высокодисперсные, наноразмерные, гидрофобные с высокоразвитой удельной поверхностью частицы. Они содержат на поверхности остаточные алкокси- и гидроксильные группы. Размеры диоксида кремния составляют 10-50 нм, диоксида титана - 50-150 нм. На размер частиц и способность к агломерации существенное влияние оказывает способ смешения компонентов. Проведен гидролиз тетраэтоксисилана и тетрабутоксититана в среде водной эмульсии полидиметилсилоксанового каучука с помощью ультразвукового диспергирования. Из полученных составов удалялась вода, их отверждали и изготавливали образцы для физико-механические испытаний. Прочность при растяжении для резин, наполненных диоксидом кремния, увеличивается с 0,7 до 3,0 МПа, относительное удлинение повышается со 100% до 140 %. Вулканизаты, наполненные диоксидом титана, имеют прочность при разрыве 0,4-2,7 МПа, относительное удлинение 100-160 %.Наилучшие результаты получены при проведении совместного гидролиза тетраэтоксисилана и тетрабутоксититана. Прочность при растяжении у данных образцов составляет 3,5 МПа, относительное удлинение 180 %. Предложенная методика одновременного золь-гель синтеза в ультразвуковом поле диоксида кремния и диоксида титана позволяет улучшать физико-механические показатели вулканизатов на основе низкомолекулярного полидиметилсилоксанового каучука. The methods of formation of silicon dioxide and titanium dioxide nanoparticles by sol-gel method in a polymer molecular grid are studied. For this purpose, hydrolysis of tetraethoxysilane and tetrabutoxytitane was carried out in an ultrasonic field. The products were isolated, thermally treated to remove by-products and water, and studied by optical microscopy, IR spectroscopy, combined differential thermal and thermogravimetric analysis. As a result, highly dispersed, nanoscale, hydrophobic particles with a highly developed specific surface area were obtained. They contain residual alkoxy and hydroxyl groups on the surface. The dimensions of silicon dioxide are 10-50 nm, titanium dioxide - 50-150 nm. The size of the particles and the ability to agglomerate are significantly influenced by the method of mixing the components. Hydrolysis of tetraethoxysilane and tetrabutoxytitane was carried out in an aqueous emulsion of polydimethylsiloxane rubber using ultrasonic dispersion. Water was removed from the obtained compositions, they were cured and samples were made for physico-mechanical tests. The tensile strength for rubbers filled with silicon dioxide increases from 0.7 to 3.0 MPa, the elongation increases from 100% to 140%. Vulcanizates filled with titanium dioxide have a tensile strength of 0.4-2.7 MPa, elongation of 100-160%. The best results were obtained during the joint hydrolysis. The tensile strength of these samples is 3.5 MPa, the elongation is 180%. The proposed method of simultaneous sol-gel synthesis in an ultrasonic field of silicon dioxide and titanium dioxide allows improving the physical and mechanical properties of vulcanizates based on low molecular weight polydimethylsiloxane rubber.

Electro-plasticity’s Effect By Deformation And Impulse Impact Of A High Energy Electromagnetic Field

The problem of obtaining predicted physical and mechanical properties and a given service life of multifunctional composite protective coatings in the form of barrier layers that increase the service life of mechanical engineering products and formative tools are inherently interconnected. Among all the variety of innovative highly efficient technological processes, a special place should be given to the method of electro-acoustic spraying (ELAN). This method is innovative in the field of synthesis of multifunctional composite coatings, which allows the formation of protective films of an amorphous material on any conductive substrates [1]. This technology is based on the use of the complex energy of an electric spark and a complex ultrasonic field. The aim of this work is to optimize the process of obtaining multifunctional composite protective coatings based on the complex mass transfer of the electrode material and the subsequent formation of amorphous structures with predictable physical and mechanical properties by the method of electro-acoustic spraying based on the effect of electro-plasticity during deformation and pulsed action of a high-energy electromagnetic field.

Grouping of particles in a wideband ultrasonic field

In this paper, we propose to expand the capabilities of wideband levitation and show the possibility of forming a structure of a complex shape based on focusing a wideband field in a given area. Focusing the field of planar radiating arrays makes it possible to form a region of stable levitation in a plane parallel to the arrays. The counter radiation of the two arrays creates a standing wave, at the nodes of which the particles are grouped. The use of a wideband signal makes it possible to create many stable nodes of standing waves in specified areas, and to realize the required shape of the levitating object. Simultaneous monitoring of multiple particles in a wideband ultrasonic field may become a new direction in the development of methods of acoustic trapping and control of particles, as well as technologies of acoustic tweezers.

Construction of an optoacoustic image of biological tissues based on an algorithm for a graphics processor

The use of optical contrast between different blood particles allows the use of optoacoustic imaging to visualize the distribution of blood particles (erythrocytes, taking into account oxygen saturation), the delivery of drugs to organs through blood vessels. An algorithm for calculating the ultrasonic field obtained as a result of optoacoustic interaction has been developed to speed up calculations on the GPU board. An architecture for fast restoration of an optoacoustic signal based on graphics processing unit (GPU) programming is proposed. The algorithm used in combination with the pre-migration method provides an improvement in the resolution and sharpness of the optoacoustic image of the simulated biological tissues. Thanks to the advanced graphics processing unit (GPU) computing architecture, time-consuming main processing unit (CPU) computing is accelerated with great computational efficiency.