Effect of Process Conditions on the Structure and Properties of the Hot-Forged Fe3Al Intermetallic Alloy

The article discusses the use of KDP ferroelectric crystals (phosphates and arsenates of potassium, rubidium, cesium) and their deuterated analogues in various industries, including the creation of electro-optical devices and as hydrogen sorbents. The paper describes the physical properties of KDP crystals, changes in their properties near the phase transition temperature, as well as methods for obtaining KDP nanocrystals and their application in biomedicine. The paper also states that the phase transition in KDP crystals occurs near room temperature and manifests itself in a change in their physical properties, such as dielectric constant, optical properties, and heat capacity. In addition, approaching the phase transition temperature causes a change in the crystal lattice parameters, which can lead to the appearance of anomalous effects. The structure of the unit cell of potassium dihydrogen phosphate (KH2PO4) is considered. The plots of the temperature dependence of the order parameter of spontaneous polarization and the plots of the temperature dependence of the configurational heat capacity of the crystal in the phase transition region are calculated, and the plots of the temperature of the inverse and direct dielectric susceptibility are calculated. Graphs of the order parameter, which characterizes the degree of spontaneous polarization for different temperatures, depending on the strength of the external electric field, are also calculated.

Section: Introductionsupporting

confidence: 61%

Crystalline potassium dihydrogen phosphate (KDP) powders

Zolotarenko,

Matysina

et al. 2023

“…Розглядаючи питання стану наповнювача то це більше стосується його хімічного складу, наприклад, при розгляді наповнювача у вигляді металу потрібно враховувати тип системи наповнювача (однокомпонентна [1][2] або багатокомпонентна ситема [3][4][5][6]). Існують багато робіт по теоретичному [7][8][9] та практичному [10][11][12][13][14][15][16][17] вивченню систем, де важливу роль відіграє процеси підготовки [18][19][20][21][22][23] та обробки [24][25][26][27] матеріалів. Все це дуже важливо так як дозволяє прогнозувати фізико-хімічних властивостей готового композиту.…”

Section: вступunclassified

Using 3d printing (CJP) technology to create composite three-dimensional products based on carbon nanostructures

Zolotarenko,

Akhanova

et al. 2023

The conditions for the use of carbon nanotubes (CNT) synthesized by the pyrolytic method are described and a method for their use in a CJP 3D printer is developed. Methods for preparing synthesis products for use in 3D printers of CJP, FDM, SLA, SLS technologies are described. In the research work, the fact was established and the advantages of the composite material (СNT - Al2O3) over the original ceramic material were listed. Also, the technique for creating composite 3D products from consumable mechanical mixtures (СNT/Al2O3) was considered, where the technology for their preparation was considered. The bending strength of 3D printed ceramics reinforced with carbon nanotubes has been measured. The resistance to mechanical fracture of composites obtained using helical and straight СNT has been studied, and it has been shown that when using helical СNT, the parts of the product do not crumble during destruction, but remain united even under load. A small review was made in the form of a table comparing the strength characteristics of various ceramics in comparison with the resulting composite (CNT - Al2O3). The strength parameters of the composite CNT - Al2O3 after its 3D printing and sintering were determined, with the content of CNT 0, 20, 30, 50% vol. A comparative analysis of the strength indicators for composite 3D products reinforced with spiral or straight CNT was carried out, where the content of CNT reached from 0 to 50% vol. All obtained materials (CNT, Al2O3 and a composite based on them) were studied by electron microscopy.

“…The type of systems of such materials (single-component [73][74] or multicomponent [75][76][77][78] systems) plays an important role, as does the preparation [79][80][81][82][83][84] and processing [85][86][87][88] of metals, what is confirmed by experimental [89][90][91][92][93][94][95][96] and theoretical data [97][98][99].…”

Section: Introductionmentioning

confidence: 99%

Creation of 3D-products using carbon nanostructures and 3D-printing technologies (FDM, CJP, SLA, SLS)

Zolotarenko,

Rudakova

et al. 2023

The article discusses methods for obtaining carbon nanostructures (CNS), as well as their use to create three-dimensional (3D) products using FDM, CJP, SLA, SLS technologies. The process of manufacturing consumables for 3D printing technologies (FDM, CJP, SLA, SLS) for creating new composite 3D products based on carbon nanostructures is described. The paper contains a detailed description of which methods of CNS synthesis are more productive and how they allow you to guarantee the production of one or another type of CNS. The paper analyzes the existing 3D printing technologies using CNS, developed a scheme for the full cycle of creating a 3D product containing CNS, taking into account various methods for the synthesis of CNS with the transformation of graphite or other carbon-containing material. It also describes the process of creating composite coils for FDM 3D printing from nanocomposite filaments (rigid polymer-CNS) based on a rigid polymer, which have undergone the process of preparation in a special mixer. The process of preparing consumables and printing a 3D volumetric product using FDM, CJP, SLA, SLS technologies using CNS is described. An overview of consumables for 3D products of FDM technology is presented. The analysis of composite 3D products (ceramic-CNS, rigid polymer-CNS) obtained by FDM and CJP technology was carried out. The paper also describes the three most productive methods for the synthesis of CNS: plasma-chemical synthesis in gas or liquid and pyrolytic method. These synthesis methods make it possible to guarantee the production of a certain type of CNS and have a high quality of the obtained nanoproducts. Various types of CNS are described, including soluble (fullerenes and fullerene-like structures) and insoluble nanostructures (graphenes, carbon nanotubes, carbon nanofibers, nanocomposites, etc.).