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Hardness of a Metal Matrix Composite Coating Deposited by Plasma Spraying with a Dispersed Titanium Carbide Phase 等离子喷涂分散碳化钛相金属基复合涂层的硬度研究
IF 0.6 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-09-21 DOI: 10.1134/S0040579525700447
S. Yu. Zhachkin, G. I. Trifonov
{"title":"Hardness of a Metal Matrix Composite Coating Deposited by Plasma Spraying with a Dispersed Titanium Carbide Phase","authors":"S. Yu. Zhachkin,&nbsp;G. I. Trifonov","doi":"10.1134/S0040579525700447","DOIUrl":"10.1134/S0040579525700447","url":null,"abstract":"<p>The results of a study on the hardness of a composite coating formed by plasma spraying are presented. The economic feasibility and relevance of the research are analyzed in the context of the need for technologies to restore machinery in the agro-industrial sector by applying functional coatings to worn surfaces using plasma spraying. The objective of the study was to experimentally investigate the effect of plasma spraying parameters on the hardness of the resulting composite coating. A review of existing scientific works is provided, covering various aspects of coating hardness depending on the application methods and the use of multicomponent functional materials. The spraying was carried out using the UPNS-3040 unit. A powder mixture was selected for spraying, consisting of 76.5% PR-NKh17SR4 powder with a particle size of 40–64 µm and 23.5% titanium carbide powder with a particle size of 63–80 µm (average 73.6 µm). This mixture has proven effective in several of the authors’ previous studies in producing high-quality composite coatings. The resulting coating was tested for hardness in <i>H</i><sub>V</sub> (HRC) using a PMT-3 hardness tester under a load of 50 N. A correlation analysis of the data was carried out to identify multicollinear relationships between spraying parameters and coating hardness. A regression analysis was also performed, resulting in an equation describing the effect of plasma spraying parameters on the coating hardness. A graphical interpretation of the dependences was presented using desirability functions, which made it possible to assess the nature and degree of influence of spraying parameters on hardness values. The study showed that the hardness of the composite coating depends on three factors: arc current of the plasma torch, spraying distance, and mass feed rate of the sprayed material.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"59 2","pages":"258 - 263"},"PeriodicalIF":0.6,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Localization of Volatile Fission Products on Pilot-Scale Ceramic Block-Type Contact Elements 挥发性裂变产物在中试陶瓷块状接触元件上的定位
IF 0.6 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-09-21 DOI: 10.1134/S0040579525700708
M. D. Gasparyan, V. N. Grunskii, Yu. S. Mochalov, L. P. Sukhanov, O. Yu. Salnikova, S. M. Savchits, A. I. Dubko, V. D. Stolyarov
{"title":"Localization of Volatile Fission Products on Pilot-Scale Ceramic Block-Type Contact Elements","authors":"M. D. Gasparyan,&nbsp;V. N. Grunskii,&nbsp;Yu. S. Mochalov,&nbsp;L. P. Sukhanov,&nbsp;O. Yu. Salnikova,&nbsp;S. M. Savchits,&nbsp;A. I. Dubko,&nbsp;V. D. Stolyarov","doi":"10.1134/S0040579525700708","DOIUrl":"10.1134/S0040579525700708","url":null,"abstract":"<p>The efficiency of capturing cesium, iodine, and molybdenum compounds in a gas purification unit equipped with multifunctional ceramic block-type contact elements scaled to pilot-industrial dimensions has been evaluated. The dynamic sorption capacity of the elements was determined under conditions close to those of high-temperature reprocessing of spent nuclear fuel. Chemisorption products were identified by X‑ray phase analysis.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"59 2","pages":"448 - 454"},"PeriodicalIF":0.6,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Magnesium Products from Associated High-Mineralized Chloride Brines 相关高矿化氯化物卤水的镁产品
IF 0.6 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-09-21 DOI: 10.1134/S0040579525700654
A. D. Ryabtsev, L. T. Menzheres, A. V. Letuev
{"title":"Magnesium Products from Associated High-Mineralized Chloride Brines","authors":"A. D. Ryabtsev,&nbsp;L. T. Menzheres,&nbsp;A. V. Letuev","doi":"10.1134/S0040579525700654","DOIUrl":"10.1134/S0040579525700654","url":null,"abstract":"<p>The process of precipitating magnesium hydroxide from associated high-mineralized calcium–magnesium chloride brines and obtaining magnesium products through carbonation and decarbonation of the resulting solution has been studied. The influence of various factors on these processes has been analyzed. Practical recommendations are provided.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"59 2","pages":"409 - 417"},"PeriodicalIF":0.6,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Antifouling Activity of Oxide Films Prepared by the Extraction–Pyrolytic Method under Continental Water Body Conditions 大陆水体条件下萃取-热解法制备氧化膜的防污性能
IF 0.6 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-09-21 DOI: 10.1134/S0040579525700435
A. O. Zakharova, S. D. Lomovtseva, T. N. Patrusheva, M. I. Orlova, E. V. Strogova, S. K. Petrov
{"title":"Antifouling Activity of Oxide Films Prepared by the Extraction–Pyrolytic Method under Continental Water Body Conditions","authors":"A. O. Zakharova,&nbsp;S. D. Lomovtseva,&nbsp;T. N. Patrusheva,&nbsp;M. I. Orlova,&nbsp;E. V. Strogova,&nbsp;S. K. Petrov","doi":"10.1134/S0040579525700435","DOIUrl":"10.1134/S0040579525700435","url":null,"abstract":"<p>The possibility of protecting materials against fouling by using oxide film coatings under freshwater body conditions was considered. Oxide film coatings differ from widely used paint and varnish materials in hardness, durability, and anticorrosion properties. The oxide coatings used in the experiment were prepared by the solution extraction–pyrolytic method, which enables coating large surfaces without the use of vacuum systems. During the study of the protective properties and environmental safety of the film coatings, the possibility of applying an original biotesting method for the samples was examined using natural zooplankton under laboratory conditions and in short-term tests under natural water body conditions to determine the protection mechanism and to calculate the individual and overall dynamic biocidal efficiency of the coated samples. The procedure for conducting the studies and calculations for evaluating the antifouling properties, type of protection mechanism, and environmental safety of the developed coatings is described.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"59 2","pages":"251 - 257"},"PeriodicalIF":0.6,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Interaction of Loparite Concentrate with Ammonium Sulfate 洛帕利矿精矿与硫酸铵的相互作用
IF 0.6 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-09-21 DOI: 10.1134/S0040579525700617
M. A. Medkov, G. F. Krysenko, E. E. Dmitrieva, E. B. Merkulov, S. I. Ivannikov
{"title":"Interaction of Loparite Concentrate with Ammonium Sulfate","authors":"M. A. Medkov,&nbsp;G. F. Krysenko,&nbsp;E. E. Dmitrieva,&nbsp;E. B. Merkulov,&nbsp;S. I. Ivannikov","doi":"10.1134/S0040579525700617","DOIUrl":"10.1134/S0040579525700617","url":null,"abstract":"<p>The results of a study on the interaction of loparite concentrate with ammonium sulfate are presented. It was found that the reactions of the main components of the concentrate with (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub> begin after the thermal decomposition of ((NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub> with the formation of ammonium hydrosulfate and proceed in the temperature range of 280–350°C to form double sulfates of ammonium and the elements contained in the concentrate. It was shown that aqueous leaching of the reaction product at 340°C followed by holding the resulting solution at 80°C makes it possible to completely precipitate titanium, niobium, and tantalum as hydroxides, while transferring the rare-earth elements into the solution.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"59 2","pages":"386 - 391"},"PeriodicalIF":0.6,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Technetium Recovery from Uranium Extract and Its Concentration Using a Separator during Reprocessing of Spent Nuclear Fuel 乏核燃料后处理过程中铀萃取物中锝的回收及其分离富集
IF 0.6 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-09-21 DOI: 10.1134/S0040579525700666
K. N. Dvoeglazov, L. N. Podrezova, E. D. Filimonova, D. V. Zverev, A. I. Bogdanov
{"title":"Technetium Recovery from Uranium Extract and Its Concentration Using a Separator during Reprocessing of Spent Nuclear Fuel","authors":"K. N. Dvoeglazov,&nbsp;L. N. Podrezova,&nbsp;E. D. Filimonova,&nbsp;D. V. Zverev,&nbsp;A. I. Bogdanov","doi":"10.1134/S0040579525700666","DOIUrl":"10.1134/S0040579525700666","url":null,"abstract":"<p>The process of reductive reextraction of technetium from a simulated solution of spent nuclear fuel using a separator equipped with an upper separation chamber was tested. Technetium-concentrating reextraction was performed using a nitric acid solution containing a mixture of the reductants carbohydrazide and diformylhydrazine at an organic-to-aqueous (O/A) phase ratio of 20 to 25. Precipitation was observed during reextraction, but it did not disturb the hydrodynamic operating conditions of the separator.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"59 2","pages":"418 - 424"},"PeriodicalIF":0.6,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Chromatographic Methods in the Separation of Rare-Earth Elements 稀土元素分离的色谱方法
IF 0.6 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-09-21 DOI: 10.1134/S0040579525700678
V. V. Belova, A. E. Kostanyan
{"title":"Chromatographic Methods in the Separation of Rare-Earth Elements","authors":"V. V. Belova,&nbsp;A. E. Kostanyan","doi":"10.1134/S0040579525700678","DOIUrl":"10.1134/S0040579525700678","url":null,"abstract":"<p>A review is presented of literature sources published in Russia and abroad, mainly over the past 10–15 years, concerning the use of chromatographic methods in the separation of rare-earth elements. Analysis of the published data shows that liquid chromatography is currently the most widely applied technique due to its versatility in separation modes, reliability, and rapid operation. Although chromatographic methods are significantly inferior to extraction in terms of throughput, they can be extensively employed in, for example, ultrafine purification processes and the production of individual rare-earth elements of exceptionally high purity. Liquid–liquid chromatography, in which both phases remain in the free liquid state and the separation processes are similar to nonstationary extraction, is noted as the most promising approach for the separation of rare-earth elements. The implementation of such extraction–chromatographic separation processes on an industrial scale is feasible using standard industrial extraction equipment, such as a cascade of extraction columns or a cascade of mixer–settler extractors.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"59 2","pages":"425 - 432"},"PeriodicalIF":0.6,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Production of Double Sodium Zirconium Phosphate with NASICON Structure by Solution Pyrolysis in Melt 熔体溶液热解法制备NASICON结构的双磷酸锆钠
IF 0.6 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-06-27 DOI: 10.1134/S0040579525700083
D. N. Grishchenko, V. G. Kuryaviy, M. A. Medkov
{"title":"Production of Double Sodium Zirconium Phosphate with NASICON Structure by Solution Pyrolysis in Melt","authors":"D. N. Grishchenko,&nbsp;V. G. Kuryaviy,&nbsp;M. A. Medkov","doi":"10.1134/S0040579525700083","DOIUrl":"10.1134/S0040579525700083","url":null,"abstract":"<div><p>A method for producing double zirconium and sodium phosphate of the composition NaZr<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>, related to the <i>NASICON</i> family with the general formula Na<sub>1 +</sub> <sub><i>x</i></sub>Zr<sub>2</sub>Si<sub><i>x</i></sub>P<sub>3</sub>–<i>x</i>O<sub>12</sub>, where <i>x</i> = 0, is proposed. The method of pyrolysis of a solution containing a mixture of organic components in a rosin melt is used. Optimum conditions for the synthesis of a low-dimensional compound are determined. Various variants of precursor compositions are considered. It is established that adding small amounts of a Si-containing component to the precursor makes it possible to obtain the purest NaZr<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> composition at a calcination temperature of 1000–1200°C. The studies expand the list of methods for synthesizing <i>NASICON</i> materials.</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"59 1","pages":"42 - 48"},"PeriodicalIF":0.6,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145145034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Synthesis and Study of the Properties of the Metal–Organic Framework Compound UiO-66-NH2 金属-有机骨架化合物UiO-66-NH2的合成及性能研究
IF 0.6 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-06-27 DOI: 10.1134/S0040579525700095
Yu. A. Suvorova, N. P. Kozlova
{"title":"Synthesis and Study of the Properties of the Metal–Organic Framework Compound UiO-66-NH2","authors":"Yu. A. Suvorova,&nbsp;N. P. Kozlova","doi":"10.1134/S0040579525700095","DOIUrl":"10.1134/S0040579525700095","url":null,"abstract":"<div><p>The metal–organic framework compound MOF UiO-66-NH<sub>2</sub> is synthesized by the solvothermal method in the form of powder and on fabric. X-ray phase analysis of the synthesized powder MOF UiO-66-NH<sub>2</sub> is carried out. The results obtained in the study of the static adsorption capacity of the samples indicate a high adsorption activity of MOF UiO-66-NH<sub>2</sub>. The materials developed on the basis of the MOF can be used in the future in the development of personal protective equipment against exposure to toxic substances.</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"59 1","pages":"49 - 52"},"PeriodicalIF":0.6,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145145210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Change in the Redox Potential of Water in a Flow Plasma Reactor in a Cavitation Field and Generation of Active Oxygen Forms 空化场下流动等离子体反应器中水氧化还原电位的变化及活性氧形态的生成
IF 0.6 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2025-06-27 DOI: 10.1134/S004057952570037X
A. V. Kamler, V. M. Bayazitov, I. S. Fedulov, M. M. Sozarukova, R. V. Nikonov, E. S. Mikhalev
{"title":"Change in the Redox Potential of Water in a Flow Plasma Reactor in a Cavitation Field and Generation of Active Oxygen Forms","authors":"A. V. Kamler,&nbsp;V. M. Bayazitov,&nbsp;I. S. Fedulov,&nbsp;M. M. Sozarukova,&nbsp;R. V. Nikonov,&nbsp;E. S. Mikhalev","doi":"10.1134/S004057952570037X","DOIUrl":"10.1134/S004057952570037X","url":null,"abstract":"<div><p>When treating a water flow with an electric discharge generated in a cavitation field, a prolonged effect on the organic compounds dissolved in the water is revealed. The given effect is caused by the active oxygen forms appearing in the technological process and the decomposition of a water molecule as a result of chemical reactions. The performed studies show that major changes in the properties of the treated water are related to an essential decrease in the redox potential up to negative values, as indirectly confirmed by the formation of uniformly distributed active oxygen forms retained in the volume. The revealed effect can be widely used in the processes of producing plasma-treated water for industrial and household application.</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"59 1","pages":"212 - 218"},"PeriodicalIF":0.6,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145145483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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