Perspektivnye Materialy最新文献_第3页

Technology and properties of high-temperature piezoceramic materials based on phases of the system (1 – у)(Bi0.8Ba0.2)Fe0.8Ti0.2O3 – у(Ba0.85Ca0.15)Ti0.90Zr0.10O3 基于相体系(1 - m)(Bi0.8Ba0.2)Fe0.8Ti0.2O3 - m (Ba0.85Ca0.15) ti0.90 zr0.100 o3的高温压电陶瓷材料工艺与性能

Perspektivnye Materialy Pub Date : 2023-01-01 DOI: 10.30791/1028-978x-2023-4-60-67

А. A. Nesterov, M. Tolstunov

引用次数: 0

Chalcogenides of bismuth obtained by various methods 用各种方法得到的铋硫属化合物

Perspektivnye Materialy Pub Date : 2023-01-01 DOI: 10.30791/1028-978x-2023-2-21-31

L. D. Ivanova, Y. Granatkina, I. Y. Nikhezina, A. G. Malchev, M. I. Zaldastanishvili, S. P. Krivoruchko, O. N. D’yakonov, R. Karima

{"title":"Chalcogenides of bismuth obtained by various methods","authors":"L. D. Ivanova, Y. Granatkina, I. Y. Nikhezina, A. G. Malchev, M. I. Zaldastanishvili, S. P. Krivoruchko, O. N. D’yakonov, R. Karima","doi":"10.30791/1028-978x-2023-2-21-31","DOIUrl":"https://doi.org/10.30791/1028-978x-2023-2-21-31","url":null,"abstract":"The microstructure and thermoelectric properties of a Bi2Te3–Bi2Se3 solid solution samples containing 20 mol. % Bi2Te3 doped with Hg2Cl2 of n-type conductivity obtained by hot pressing, extrusion and spark plasma sintering of powders prepared by melt spinning and grinding the ingot in a ball mill were studied. Optical and electron scanning microscopy methods were used. The effect of the disk rotation speed on the morphology of particles obtained by melt spinning is investigated. The Seebeck coefficient, electrical conductivity and thermal conductivity were measured at room temperature and in the temperature range 100 – 700 K and the thermoelectric figure of merit was calculated. The samples had anisotropy of electrical conductivity (σ) and thermal conductivity (κ) in the direction perpendicular and parallel to the pressing, the Seebeck coefficient (α) was isotropic. At 300 K anisotropy factors σ┴/σ// ~ 2, κ┴/κ// ~ 2, α┴/α// ~ 1. The highest thermoelectric figure of merit (ZT)max = 1,0 ± 0,1 at ~ 470 K was obtained for extruded samples from powders prepared by grinding the ingot and for hot-pressed samples from powders obtained by melt spinning.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77964673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spark Plasma Sintering of ultrafine-grained WC – Al2O3 ceramics 超细晶WC - Al2O3陶瓷的放电等离子烧结

Perspektivnye Materialy Pub Date : 2023-01-01 DOI: 10.30791/1028-978x-2023-4-76-88

E. Lantsev, A. Nokhrin, M. Boldin, K. Smetanina, A. Murashov, Yu. V. Blagoveshchenskiy, N. Isaeva, G. Shcherbak, V. Chuvil’deev, N. Tabachkova, A. Terentyev

{"title":"Spark Plasma Sintering of ultrafine-grained WC – Al2O3 ceramics","authors":"E. Lantsev, A. Nokhrin, M. Boldin, K. Smetanina, A. Murashov, Yu. V. Blagoveshchenskiy, N. Isaeva, G. Shcherbak, V. Chuvil’deev, N. Tabachkova, A. Terentyev","doi":"10.30791/1028-978x-2023-4-76-88","DOIUrl":"https://doi.org/10.30791/1028-978x-2023-4-76-88","url":null,"abstract":"The sintering mechanisms of WC – Al2O3 nanopowder compositions with different contents of aluminum oxide particles (1, 3, 5 wt.%) were investigated. Samples of WC – Al2O3 ceramics were produced by Spark Plasma Sintering method (SPS) in vacuum, by heating to a temperature of 1450 °C at a rate of 50 °C/min under uniaxial stress 70 MPa. Plasma-chemical nanopowders of tungsten monocarbide and submicron powders of aluminum oxide were used to make the ceramics. The density, microstructure, phase composition, microhardness (Hv) and fracture toughness (KIC) of the ceramics were investigated. It was shown that the use of the SPS method makes it possible to obtain WC-Al2O3 ceramics with good relative density (95.4-98.1%) and a homogeneous microstructure with ultrafine grain size (0.1 – 0.2 μm). By the method of the X-ray phase analysis, it was established that in the process of SPS of WC-Al2O3 ceramics the formation of an undesirable W2C phase takes place, leading to decrease in the fracture toughness KIC. To reduce the intensity of W2C particle formation, colloidal graphite (0.1, 0.2, 0.3 wt.%) was added to WC – Al2O3 ceramics. Using the Young-Cutler model and the model of diffusion resorption of pores it was shown that the main mechanism of SPS of WC – Al2O3 ceramics is grain boundary diffusion. It is shown that the introduction of graphite leads to a decrease in the activation energy of SPS of WC – Al2O3 ceramics, which is probably due to a decrease in the W2C particle content to 0.5 wt.%.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76364710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Choice of accelerators of the vulcanization group for rubbers based on epichlorohydrin rubber 环氧氯丙烷橡胶硫化组促进剂的选择

Perspektivnye Materialy Pub Date : 2023-01-01 DOI: 10.30791/1028-978x-2023-3-24-31

M. Davydova, A. R. Khaldeeva, A. Fedorova, M. Sokolova

{"title":"Choice of accelerators of the vulcanization group for rubbers based on epichlorohydrin rubber","authors":"M. Davydova, A. R. Khaldeeva, A. Fedorova, M. Sokolova","doi":"10.30791/1028-978x-2023-3-24-31","DOIUrl":"https://doi.org/10.30791/1028-978x-2023-3-24-31","url":null,"abstract":"The effect of vulcanization accelerators on the structure and properties of rubbers based on Hydrin T6000 epichlorohydrin rubber has been studied. Mercaptobenzthiazole (MBT) in the amount of 1.5 pts.wt., tetramethylthiuram disulfide (TMTD) — 0.5 – 1.5 pst.wt. were used as accelerators and N,N’-diphenylguanidine (DPG) — 0.5 – 1.5 pst.wt., which represent a triple system of accelerators. The choice of accelerators is based on the possibility of obtaining a vulcanization spatial structure of different sulfide content: thiuram group accelerators promote the formation of mono-, disulfide bonds; guanidine — polysulfide bonds, and thiazole groups — from carbon-carbon to polysulfide with varying degrees of sulfide. According to the results of the study of physical and mechanical properties, the determination of the parameters of the spatial grid and the study of the dynamic behavior of rubber, differences were revealed due to the formation of a spatial structure with different types of cross-links and density. It is shown that rubber containing 1.5 pst. wt. MBT, 0.5 pst. wt. DFG and 0.5 – 1.0 pst.wt. TMTD due to the manifestation of a synergistic effect on the formation of a vulcanization network of a certain density and the ratio of poly-, di- and monosulfide cross-links. Thus, the use of a group of accelerators with different functional effects makes it possible to obtain vulcanizates with an optimal set of technological and operational properties.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":"42 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74255787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study of the mechanical properties and structure of the “silver – polyethylene terephthalate” composite “银-聚对苯二甲酸乙二醇酯”复合材料的力学性能和结构研究

Perspektivnye Materialy Pub Date : 2023-01-01 DOI: 10.30791/1028-978x-2023-6-17-23

D. Panov

{"title":"Study of the mechanical properties and structure of the “silver – polyethylene terephthalate” composite","authors":"D. Panov","doi":"10.30791/1028-978x-2023-6-17-23","DOIUrl":"https://doi.org/10.30791/1028-978x-2023-6-17-23","url":null,"abstract":"Samples of the “silver – polymer” composite were obtained by the matrix synthesis method. Track membranes made of polyethylene terephthalate with pores of different diameters and with different concentrations were used as a matrix. The matrix pores were filled by electrochemical deposition. The structure and mechanical properties of this composite, which is a porous polymer matrix with nano- and microwires of silver deposited into pores, have been studied. Mechanical properties were determined experimentally by stretching the samples. Using the method of scanning electron microscopy, it was found that the length of nano- and microwires filling the pores of the PET matrix is not the same in the same sample, while frequent mutual intersection of the wires was observed, the concentrations of nano- and microwires were determined from SEM microimages. The crossing probability and the number of crossing nano- and microwires were calculated using a previously developed technique based on the single bond method. It is shown that the mechanical properties of the metal-polymer composite are significantly affected by the number of wire intersections and, at the same concentration of wires, their diameter.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74346198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

P – T – X diagram of the Co – Mg system Co - Mg体系的P - T - X图

Perspektivnye Materialy Pub Date : 2023-01-01 DOI: 10.30791/1028-978x-2023-7-5-9

Y. Levinsky, E. Vershinina, M. Alymov

引用次数: 0

Investigation of the influence of carbon fillers on the manifestation of the effect of tensoresistivity in tire regenerates 碳填料对轮胎再生材料中张阻效应表现的影响研究

Perspektivnye Materialy Pub Date : 2023-01-01 DOI: 10.30791/1028-978x-2023-4-50-59

N. V. Shadrinov, K. P. Antoev

{"title":"Investigation of the influence of carbon fillers on the manifestation of the effect of tensoresistivity in tire regenerates","authors":"N. V. Shadrinov, K. P. Antoev","doi":"10.30791/1028-978x-2023-4-50-59","DOIUrl":"https://doi.org/10.30791/1028-978x-2023-4-50-59","url":null,"abstract":"An opportunity of development of electrically conductive rubber based on industrially produced tyre regenerate RShT-4 and Reg-1, obtained in laboratory conditions, with electrically conductive carbon fillers is shown. OMCARB CH85 carbon black (CB) produced by “Omsktehuglerod” Ltd. and Tenax-e HTS-45 carbon fibres (CF) produced by Toho Tenax America were used as electrically conductive fillers. Curing and rheometric properties of regenerates with different content of Santogard PVI and electroconductive fillers have been investigated. The study of physical and mechanical properties of regenerates has shown that introduction and increase of electroconductive CB and CF content in Reg-1 and RShT-4 leads to gradual reduction of elongation at break and increase in tensile strength and Shore A hardness, which is evidence of reinforcing effect of fillers. The effect of tensoresistance in the obtained regenerates depending on the content of electroconductive fillers is investigated. It is shown that addition of electroconductive CB to Reg-1 and RSHT-4 gives electroconductivity and tensoresistivity, that is, decrease of resistance in compression. Addition of CF leads to the opposite effect - increase of electrical resistance in compression. The possible mechanisms for the manifistation of tensoresistance at introduction of electroconductive CB and decrease of electroconductivity at introduction of CF are offered.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81923375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Features of spark erosion fine Mo and Nb alloys powders 火花侵蚀Mo和Nb合金粉末的特征

Perspektivnye Materialy Pub Date : 2023-01-01 DOI: 10.30791/1028-978x-2023-5-35-45

N. V. Shchipalkina, S. V. Pshenov, V. Chursin, D. S. Sadilo, E. Kolesnikov

引用次数: 0

Development of direct laser deposition technology for large-scale products of nuclear power engineering 核动力工程大型产品直接激光沉积技术的发展

Perspektivnye Materialy Pub Date : 2023-01-01 DOI: 10.30791/1028-978x-2023-5-46-55

V. A. Korolev, A. Sidorov, I. Mikhailov, A. A. Matsaev, E. Zemlyakov, P. Kuznetsov, D. A. Nameev

引用次数: 0

Effect of low-temperature plasma treatment on polyketon films: changes in the chemical structure and surface morphology 低温等离子体处理对聚酮膜的影响:化学结构和表面形貌的变化

Perspektivnye Materialy Pub Date : 2023-01-01 DOI: 10.30791/1028-978x-2023-2-54-61

M. Piskarev, А. V. Zinoviev, A. Gilman, E. Skryleva, B. Senatulin, A. Kuznetsov, A. Gatin

引用次数: 0