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International Journal of Self-Propagating High-Temperature Synthesis最新文献

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Combustion Initiation in Gas-Free Mixture by Local Hot Spot 局部热点在无气混合气中的起燃作用
IF 0.6
International Journal of Self-Propagating High-Temperature Synthesis Pub Date : 2023-09-05 DOI: 10.3103/S1061386223030020
A. P. Aldushin, P. M. Krishenik, S. A. Rogachev
{"title":"Combustion Initiation in Gas-Free Mixture by Local Hot Spot","authors":"A. P. Aldushin,&nbsp;P. M. Krishenik,&nbsp;S. A. Rogachev","doi":"10.3103/S1061386223030020","DOIUrl":"10.3103/S1061386223030020","url":null,"abstract":"<p>The combustion initiation of condensed mixture with unlimited mass by limited high-temperature spot was mathematically modelled. It was shown that in contrast to the sample critical diameter, at which the combustion dies out due to heat loss, the critical radius of the hot spot upon initiation of large-volume gas-free mixture is determined only by its physicochemical characteristics (Zel’dovich number).</p>","PeriodicalId":595,"journal":{"name":"International Journal of Self-Propagating High-Temperature Synthesis","volume":"32 3","pages":"188 - 191"},"PeriodicalIF":0.6,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4235127","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
Self-Propagating High-Temperature Synthesis and Consolidation of MoSi2–MoB Heterophase Ceramics Alloyed with ZrB2 ZrB2合金MoSi2-MoB异相陶瓷自蔓延高温合成与固结
IF 0.6
International Journal of Self-Propagating High-Temperature Synthesis Pub Date : 2023-09-05 DOI: 10.3103/S106138622303007X
Yu. S. Pogozhev, A. Yu. Potanin, S. I. Rupasov, F. V. Kiryukhantsev-Korneev, E. A. Levashov
{"title":"Self-Propagating High-Temperature Synthesis and Consolidation of MoSi2–MoB Heterophase Ceramics Alloyed with ZrB2","authors":"Yu. S. Pogozhev,&nbsp;A. Yu. Potanin,&nbsp;S. I. Rupasov,&nbsp;F. V. Kiryukhantsev-Korneev,&nbsp;E. A. Levashov","doi":"10.3103/S106138622303007X","DOIUrl":"10.3103/S106138622303007X","url":null,"abstract":"<p>In this study, we investigate the self-propagating high-temperature synthesis (SHS) and consolidation of heterophase MoSi<sub>2</sub>–MoB ceramics alloyed with ZrB<sub>2</sub>. A thermodynamic analysis of the combustion temperature (<i>T</i><sub>ad</sub>) and the equilibrium composition of synthesis products was performed for the Zr–Mo–Si–B system. The effect of varying Zr and B concentrations on combustion kinetics was studied in detail. The resulting heterophase SHS powders showed high structural and chemical homogeneity, though were noticeably agglomerated. We identified optimal consolidation conditions and achieved compact ceramics with a phase composition identical to the original SHS powder. The ceramic structure consists of a matrix of MoSi<sub>2</sub> grains with interspersed needle-like ZrB<sub>2</sub> grains and polyhedral inclusions of MoB. This work establishes a basis for the preparation of MoSi<sub>2</sub>–MoB–ZrB<sub>2</sub> ceramics with excellent hardness, fracture toughness, thermal conductivity, and high-temperature oxidation resistance.</p>","PeriodicalId":595,"journal":{"name":"International Journal of Self-Propagating High-Temperature Synthesis","volume":"32 3","pages":"221 - 232"},"PeriodicalIF":0.6,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4233947","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
Structural Macrokinetics of Combustion of Ti-Based Mixtures with Titanium Particles of Different Sizes 不同尺寸钛颗粒的钛基混合物燃烧的结构宏观动力学
IF 0.6
International Journal of Self-Propagating High-Temperature Synthesis Pub Date : 2023-09-05 DOI: 10.3103/S106138622303010X
B. S. Seplyarskii, R. A. Kochetkov, T. G. Lisina
{"title":"Structural Macrokinetics of Combustion of Ti-Based Mixtures with Titanium Particles of Different Sizes","authors":"B. S. Seplyarskii,&nbsp;R. A. Kochetkov,&nbsp;T. G. Lisina","doi":"10.3103/S106138622303010X","DOIUrl":"10.3103/S106138622303010X","url":null,"abstract":"<p>Experimental dependences of the combustion velocity on the size of titanium particles for powder and granular mixtures of 5Ti + 3Si, Ti + C<sup>am</sup>, (Ti + C<sup>am</sup>) + 20% Cu, (Ti + C<sup>am</sup>) + 20% Ni, Ti + C<sup>cr</sup> (with amorphous carbon in the form of soot and with crystalline carbon in the form of graphite) were compared. The results of experiments were explained by the retarding effect of impurity gases in powder mixtures when the conditions of warming up the particles before the combustion front were met. For all the studied granular mixtures, where the influence of impurity gases on the combustion velocity was leveled, analytical dependences of the combustion velocity on the size of titanium particles were in good agreement with the conclusions of the convective–conductive combustion model.</p>","PeriodicalId":595,"journal":{"name":"International Journal of Self-Propagating High-Temperature Synthesis","volume":"32 3","pages":"233 - 238"},"PeriodicalIF":0.6,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4233941","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
Simultaneous Thermal Analysis of Lithium Aluminate SCS-Precursors Produced with Different Fuels 不同燃料制备铝酸锂scs前驱体的同时热分析
IF 0.6
International Journal of Self-Propagating High-Temperature Synthesis Pub Date : 2023-09-05 DOI: 10.3103/S1061386223030111
V. D. Zhuravlev, O. G. Reznitskikh, L. V. Ermakova, T. A. Patrusheva, K. V. Nefedova
{"title":"Simultaneous Thermal Analysis of Lithium Aluminate SCS-Precursors Produced with Different Fuels","authors":"V. D. Zhuravlev,&nbsp;O. G. Reznitskikh,&nbsp;L. V. Ermakova,&nbsp;T. A. Patrusheva,&nbsp;K. V. Nefedova","doi":"10.3103/S1061386223030111","DOIUrl":"10.3103/S1061386223030111","url":null,"abstract":"<p>Lithium aluminate samples were obtained in reactions of solution combustion synthesis (SCS) with various types of fuel (glycine, leucine, and urea) from aluminum and lithium nitrate solutions. The simultaneous thermal analysis (STA) of precursors obtained in conditions of fuel and oxidizer stoichiometry showed the presence of impurities due to incomplete decomposition of initial salts containing carbon fragments of fuel and nitrate groups. An exception was the precursor from the dual-fuel SCS reaction, φ (glycine : urea) = 1 : 3, in which pure γ-LiAlO<sub>2</sub> powder was formed. Replacement of lithium nitrate with lithium carbonate was found to reduce the process temperature and the relative amount of organic fuel. As a result, the content of carbon fragments in the precursor significantly decreased after synthesis.</p>","PeriodicalId":595,"journal":{"name":"International Journal of Self-Propagating High-Temperature Synthesis","volume":"32 3","pages":"208 - 214"},"PeriodicalIF":0.6,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4235129","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
Forced SHS Compaction of TiC–NiTi Composites TiC-NiTi复合材料的强制SHS压实
IF 0.6
International Journal of Self-Propagating High-Temperature Synthesis Pub Date : 2023-09-05 DOI: 10.3103/S1061386223030044
Yu. V. Bogatov, V. A. Shcherbakov, D. Yu. Kovalev
{"title":"Forced SHS Compaction of TiC–NiTi Composites","authors":"Yu. V. Bogatov,&nbsp;V. A. Shcherbakov,&nbsp;D. Yu. Kovalev","doi":"10.3103/S1061386223030044","DOIUrl":"10.3103/S1061386223030044","url":null,"abstract":"<p>TiC–NiTi cermet composites were fabricated by forced SHS compaction from (Ti + C + Ni) mixtures with varying content of Ni + Ti from 28 to 90 wt %. The phase composition and microstructure were characterized by X-ray diffraction method, scanning electron microscopy, and energy dispersive spectroscopy. The microstructure of composites was shown to contain spherical TiC particles surrounded by the matrix including TiNi<sub>3</sub>, TiNi(B2), Ti<sub>2</sub>Ni, and Ti<sub>3</sub>Ni<sub>4</sub> phases. As Ni + Ti content was increased, there was a change in the stoichiometry of TiC (from TiC<sub>1</sub> to TiC<sub>0.43</sub>) and its particle size (from 6.5 to 0.2 μm). It was found that the microhardness of TiC–NiTi composites dropped markedly from 23.5 to 6.4 GPa.</p>","PeriodicalId":595,"journal":{"name":"International Journal of Self-Propagating High-Temperature Synthesis","volume":"32 3","pages":"242 - 246"},"PeriodicalIF":0.6,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4235103","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 Initiation and Combustion of Hf/PTFE Reactive Materials Hf/PTFE反应材料的起燃特性
IF 0.6
International Journal of Self-Propagating High-Temperature Synthesis Pub Date : 2023-09-05 DOI: 10.3103/S1061386223030081
I. V. Saikov, S. A. Seropyan, G. R. Saikova, A. Yu. Malakhov
{"title":"Features of Initiation and Combustion of Hf/PTFE Reactive Materials","authors":"I. V. Saikov,&nbsp;S. A. Seropyan,&nbsp;G. R. Saikova,&nbsp;A. Yu. Malakhov","doi":"10.3103/S1061386223030081","DOIUrl":"10.3103/S1061386223030081","url":null,"abstract":"<p>The optimum composition of components in the Hf/PTFE system was determined by thermodynamic calculation. The composition 65Hf/35PTFE (in wt %) was chosen based on the maximum adiabatic combustion temperature (<i>T</i><sub>ad</sub> = 2381°C) and the fraction of condensed products (70 wt %). The study on the ignition of compositions in argon, air, and vacuum showed that in the latter case, the intensity of ignition decreases. The maximum combustion temperature and rate in argon were found to be 2250°C and 4.5 mm/s for compositions with 10 and 15 wt % Al. XRD analysis revealed the formation of a monophase HfC product in all compositions. Shock-wave loading of compositions with a steel plate at an impact velocity of 1 km/s showed the absence of exothermic reaction in the 65Hf/35PTFE composition. Increasing the impact velocity to 1.5 km/s resulted in an exothermic reaction in this composition. The maximum yield of HfC under shock-wave loading was achieved in the composition 62Hf/33PTFE/5Al, indicating its high reactivity. Thus, this composition is the most optimal for use as a reactive material.</p>","PeriodicalId":595,"journal":{"name":"International Journal of Self-Propagating High-Temperature Synthesis","volume":"32 3","pages":"200 - 207"},"PeriodicalIF":0.6,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4231624","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
Titanium. Powder Metallurgy and SHS of Belarus. History and Prospect 钛。白俄罗斯粉末冶金和SHS。历史与展望
IF 0.6
International Journal of Self-Propagating High-Temperature Synthesis Pub Date : 2023-09-05 DOI: 10.3103/S1061386223030093
V. V. Savich
{"title":"Titanium. Powder Metallurgy and SHS of Belarus. History and Prospect","authors":"V. V. Savich","doi":"10.3103/S1061386223030093","DOIUrl":"10.3103/S1061386223030093","url":null,"abstract":"<p>A brief review of the history, current state, and prospects of using titanium powders to produce porous products and in SHS in Belarus, as well as in the world, was presented. New methods for obtaining materials, billets, raw materials, and products from commercially pure titanium powders were considered. Promising directions of applying methods and technologies of powder metallurgy and SHS using titanium powders toward producing new types of products were shown.</p>","PeriodicalId":595,"journal":{"name":"International Journal of Self-Propagating High-Temperature Synthesis","volume":"32 3","pages":"169 - 187"},"PeriodicalIF":0.6,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4234843","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
Forced SHS Compaction of TiB2–Ti: Structure and Properties TiB2-Ti的强制SHS压实:结构与性能
IF 0.6
International Journal of Self-Propagating High-Temperature Synthesis Pub Date : 2023-09-05 DOI: 10.3103/S1061386223030032
Yu. V. Bogatov, V. A. Shcherbakov
{"title":"Forced SHS Compaction of TiB2–Ti: Structure and Properties","authors":"Yu. V. Bogatov,&nbsp;V. A. Shcherbakov","doi":"10.3103/S1061386223030032","DOIUrl":"10.3103/S1061386223030032","url":null,"abstract":"<p>TiB<sub>2</sub>–Ti metal–ceramic composites were produced by forced SHS compaction. The influence of superstoichiometric amount of Ti (6–20 wt %) relative to TiB<sub>2</sub> on the regularities of combustion and phase composition/structure formation of TiB<sub>2</sub>–Ti composites was studied. It was shown that the phase composition of composites is inconsistent with the Ti–B phase diagram. The microhardness of composites was determined to drop from 34 to 18 GPa with increasing the binder content. Cutting properties of composites were evaluated.</p>","PeriodicalId":595,"journal":{"name":"International Journal of Self-Propagating High-Temperature Synthesis","volume":"32 3","pages":"239 - 241"},"PeriodicalIF":0.6,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4233990","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
Influence of Ammonium Nitrate in the Synthesis of Alpha Tricalcium Phosphates (α-TCP) in One Step by Solution Combustion 硝酸铵对溶液燃烧一步法合成磷酸三钙(α-TCP)的影响
IF 0.6
International Journal of Self-Propagating High-Temperature Synthesis Pub Date : 2023-09-05 DOI: 10.3103/S1061386223030068
E. A. Chavarriaga, E. Rodriguez, J. A. Perez-Taborda, C. García, A. A. Lopera
{"title":"Influence of Ammonium Nitrate in the Synthesis of Alpha Tricalcium Phosphates (α-TCP) in One Step by Solution Combustion","authors":"E. A. Chavarriaga,&nbsp;E. Rodriguez,&nbsp;J. A. Perez-Taborda,&nbsp;C. García,&nbsp;A. A. Lopera","doi":"10.3103/S1061386223030068","DOIUrl":"10.3103/S1061386223030068","url":null,"abstract":"<p>Calcium phosphates are materials of wide interest in the medical and agricultural industries. Advanced in the standardization of protocols to obtain them by combustion in solution in a single step is highly desirable. This is particularly so for the alpha-tricalcium phosphate (α-TCP) phase, widely used in the development of bone cement. In this research, citrulline was used as a fuel for the first time in the one-step synthesis of calcium phosphates, and the effect of adding 0–15 g of ammonium nitrate (AN) as an extra oxidizer agent was studied, allowing the temperature of the reaction to increase from 648 to 950°C. The temperature was measured using low-cost equipment with infrared and type-K thermocouple and contrasted with the estimated theoretical values of adiabatic flame temperature. X-ray diffraction analysis showed the formation of a mixture of α-TCP and hydroxyapatite phases at the lowest combustion temperature, corresponding to 0 g of AN. When the amount of AN was increased, the XRD showed that α-TCP was obtained as a metastable phase, while the amount of hydroxyapatite decreased considerably. At higher combustion temperatures, the crystallite size estimated by Scherrer equation, in turn, increased to a value of 51.61 nm. The SEM images showed the presence of necks between particles in the powders that coincide with the estimation of high reaction temperatures.</p>","PeriodicalId":595,"journal":{"name":"International Journal of Self-Propagating High-Temperature Synthesis","volume":"32 3","pages":"192 - 199"},"PeriodicalIF":0.6,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4234844","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
Mechanical Activation Assisted Self-Propagating High-Temperature Synthesis of HfB2–HfC Composites 机械活化辅助高温自传播合成HfB2-HfC复合材料
IF 0.6
International Journal of Self-Propagating High-Temperature Synthesis Pub Date : 2023-06-21 DOI: 10.3103/S1061386223020073
A. A. Zaitsev, A. Yu. Potanin, Yu. S. Pogozhev, I. O. Filonenko, E. A. Levashov
{"title":"Mechanical Activation Assisted Self-Propagating High-Temperature Synthesis of HfB2–HfC Composites","authors":"A. A. Zaitsev,&nbsp;A. Yu. Potanin,&nbsp;Yu. S. Pogozhev,&nbsp;I. O. Filonenko,&nbsp;E. A. Levashov","doi":"10.3103/S1061386223020073","DOIUrl":"10.3103/S1061386223020073","url":null,"abstract":"<p>The structure as well as the phase and granulometric compositions of the submicron-sized heterophase HfB<sub>2</sub>–34 at % HfC powders fabricated by mechanical activation assisted self-propagating high-temperature synthesis from (Hf + B + C) mixtures were studied. It was demonstrated that HfB<sub>2</sub>–HfC powders can be produced from (Hf + B + C) mixtures by mechanochemical synthesis in a planetary ball mill (centrifugal factor, 60 <i>g</i>) during more than 15 min. The SHS product with composition HfB<sub>2</sub>–34 at % HfC consisted of a combination of highly porous agglomerates sized 5–100 µm, which can be easily broken into composite HfB<sub>2</sub>–HfC particles sized 1–10 µm. Important that each composite particle of powder have a heterophase structure which consists of HfB<sub>2</sub> grains sized 0.5–2.0 µm and equiaxial HfC grains sized 0.3–1 µm. Impurity oxygen content in the SHS products did not exceed 0.29 wt %. Milling of the SHS product allowed to obtain the HfB<sub>2</sub>–34 at % HfC powder characterized by the average particle size of 4 µm with heterophase submicron-sized microstructure and oxygen content of 0.72 wt %.</p>","PeriodicalId":595,"journal":{"name":"International Journal of Self-Propagating High-Temperature Synthesis","volume":"32 2","pages":"157 - 168"},"PeriodicalIF":0.6,"publicationDate":"2023-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4826626","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
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