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

{"title":"Study of Reaction Front Propagation in Magnesiothermic Reduction of UF4","authors":"P. Kalpana,&nbsp;U. R. Thakkar,&nbsp;A. N. Patil,&nbsp;S. K. Satpati,&nbsp;R. Verma","doi":"10.3103/S1061386226700081","DOIUrl":"10.3103/S1061386226700081","url":null,"abstract":"<p>Magnesiothermic reduction of uranium tetrafluoride (UF₄) is a self-propagating high-temperature process widely employed for uranium metal production. In this study, the influence of charge preheating temperature and ignition location on reaction front propagation was experimentally investigated using a thermocouple-instrumented sealed reactor. It was observed that preheating is essential for sustaining reaction propagation following ignition. For top ignition, the reaction front velocity increased monotonically with increasing charge temperature. Beyond a threshold of approximately 250°C, the formation of molten uranium led to gravity-driven heat transfer, resulting in a sharp enhancement of propagation velocity. In contrast, bottom ignition exhibited significantly faster upward propagation of the reaction front. This was attributed to formation of magnesium vapor. The results demonstrated that both ignition location and initial charge temperature play a critical role in determining reaction dynamics. Enhanced propagation rates and attainment of molten product phases were key factors governing efficient slag–metal separation and the quality of the uranium ingot. The activation energy of the system was estimated to be ~46.55 kJ/mol. This work provided experimental insight into reaction front behavior in UF₄ magnesiothermic reduction and established correlations between processing conditions, propagation characteristics, and product quality.</p>","PeriodicalId":595,"journal":{"name":"International Journal of Self-Propagating High-Temperature Synthesis","volume":"35 3","pages":"153 - 164"},"PeriodicalIF":0.6,"publicationDate":"2026-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148962147","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}

{"title":"Solution Combustion Synthesis as a Route for the Preparation of Hydroxyapatite and Tricalcium Phosphates: A Review","authors":"A. A. Lopera,&nbsp;J. J. Vaca-González,&nbsp;E. A. Chavarriaga","doi":"10.3103/S1061386226700159","DOIUrl":"10.3103/S1061386226700159","url":null,"abstract":"<p>Calcium phosphates (CPs) are biomaterials of significant interest in bone tissue engineering due to their close chemical and structural similarity to the inorganic component of natural bone. Among this family, hydroxyapatite (HAp) and tricalcium phosphates (TCPs, β-TCP, α-TCP) are the most widely used phases. These materials differ in their Ca/P molar ratio (1.67 for HAp and 1.50 for TCPs), crystal structure, and thermodynamic stability, etc. They share excellent bioactivity and biocompatibility, making them suitable for a wide range of biomedical applications. Solution combustion synthesis (SCS) has emerged as an alternative to conventional synthesis routes, such as solid-state reactions and coprecipitation, offering a rapid and energy-efficient pathway to obtain calcium phosphate phases with tailored properties. It has been demonstrated that both the fuel-to-oxidizer ratio and the nature of the fuel are key parameters in controlling phase formation during SCS. Moreover, these parameters strongly influence the resulting microstructural features, including morphology, porosity, crystallite size, and degree of agglomeration. Despite the widespread application of SCS in the synthesis of inorganic oxides, its use for the preparation of calcium phosphate phases remains comparatively underexplored, and comprehensive reviews specifically addressing this topic are scarce. There is a notable lack of systematic analyses correlating reaction parameters with phase selectivity and microstructural evolution in HAp and TCPs synthesized by SCS. Furthermore, there remains a clear need for robust and standardized protocols that enable precise control over material properties while ensuring reproducibility. In this context, the present review examines recent advances in the solution combustion synthesis of calcium phosphates, systematically consolidating the research conducted to date on SCS-derived calcium phosphates and elucidating the relationships between synthesis parameters, phase evolution, and microstructural development.</p>","PeriodicalId":595,"journal":{"name":"International Journal of Self-Propagating High-Temperature Synthesis","volume":"35 3","pages":"215 - 241"},"PeriodicalIF":0.6,"publicationDate":"2026-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148962152","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}

{"title":"Starch-Assisted Gel-Combustion Synthesis of Nano α-Fe2O3 and Its Catalytic Effect on Ammonium Nitrate Decomposition","authors":"S.-J. Kim,&nbsp;J.-S. Kim,&nbsp;H.-Y. Pang,&nbsp;C.-N. Sin,&nbsp;R.-J. Kim","doi":"10.3103/S106138622670010X","DOIUrl":"10.3103/S106138622670010X","url":null,"abstract":"<p>Nano-sized α-Fe₂O₃ powders were synthesized via a starch-assisted gel-combustion method. The effects of fuel type, equivalence ratio (Φ), and ammonium nitrate addition on phase formation and crystallite size were systematically investigated by X-ray diffraction. Among the examined fuels, starch promoted the formation of well-crystallized α-Fe₂O₃ under optimized combustion conditions. The crystallite size could be effectively tuned by adjusting Φ and ammonium nitrate content, yielding nanoparticles with an average size of approximately 26 nm under optimal conditions. Morphological analysis confirmed the formation of nanoscale particles with partial agglomeration, and the specific surface area of the optimized sample reached 76.28 m²/g, as determined by BET analysis. The catalytic performance of the synthesized α-Fe₂O₃ nanoparticles toward ammonium nitrate decomposition was evaluated using differential thermal analysis. A significant reduction in decomposition peak temperature was observed with increasing catalyst loading. Kissinger kinetic analysis revealed a pronounced decrease in activation energy compared to pure ammonium nitrate, demonstrating the enhanced catalytic activity of the prepared nanoparticles. The results indicate that starch-assisted gel-combustion synthesis provides an effective route for producing catalytically active nano α-Fe₂O₃ powders.</p>","PeriodicalId":595,"journal":{"name":"International Journal of Self-Propagating High-Temperature Synthesis","volume":"35 3","pages":"173 - 181"},"PeriodicalIF":0.6,"publicationDate":"2026-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148962022","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}

{"title":"Temperature-Dependent Phase Stability in NbTaCrTi(Mo,Hf) Refractory High-Entropy Alloys","authors":"V. N. Sanin,&nbsp;D. M. Ikornikov,&nbsp;O. A. Golosova,&nbsp;D. Yu. Kovalev","doi":"10.3103/S1061386226700147","DOIUrl":"10.3103/S1061386226700147","url":null,"abstract":"<p>The high-temperature behavior of two refractory high-entropy alloys, Mo₂₄Nb₂₅Ta₁₂Cr₂₃Ti₁₆ and Nb₄₅Ta₂₀Hf₁₅Ti₁₅Cr₅, was examined. Both materials exhibited strong thermal stability, preserving their bcc-based structures up to 900–1000°C. The Mo-containing alloy remained structurally stable after prolonged exposure at 900°C, while oxide phases such as Ti₂O₃ and (Ti,Me)O₂ formed at 1100°C without disrupting the primary lattice. The Hf-containing alloy also maintained its single-phase bcc structure at elevated temperatures but underwent selective surface oxidation with the formation of Nb- and Ta-based oxides. In both alloys, oxidation was mainly limited to the surface layers, and the underlying bulk remained largely unaffected.</p>","PeriodicalId":595,"journal":{"name":"International Journal of Self-Propagating High-Temperature Synthesis","volume":"35 3","pages":"207 - 214"},"PeriodicalIF":0.6,"publicationDate":"2026-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148962148","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}

{"title":"Two Conductive Combustion Modes in Granular Ti–C–Me Mixtures with Coarse Titanium Particles","authors":"B. S. Seplyarskii,&nbsp;R. A. Kochetkov,&nbsp;N. I. Abzalov,&nbsp;T. G. Lisina","doi":"10.3103/S1061386226700172","DOIUrl":"10.3103/S1061386226700172","url":null,"abstract":"","PeriodicalId":595,"journal":{"name":"International Journal of Self-Propagating High-Temperature Synthesis","volume":"35 3","pages":"245 - 249"},"PeriodicalIF":0.6,"publicationDate":"2026-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148962150","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}

{"title":"Co- and Mn-Doped ZnO Pigments Synthesized via Ginkgo Biloba Leaf-Assisted Self-Propagating Combustion: Structural and Optical Properties","authors":"S.-J. Kim,&nbsp;R.-J. Kim,&nbsp;C.-N. Sin,&nbsp;T.-S. Rim","doi":"10.3103/S1061386226700093","DOIUrl":"10.3103/S1061386226700093","url":null,"abstract":"<div><p>ZnO-based pigments doped with Co and Mn ions were synthesized via a self-propagating combustion method using Gingko biloba leaves as a bio-derived fuel. Thermogravimetric analysis confirmed an effective combustion interaction between the metal nitrates and the leaf-derived fuel, validating the combustion synthesis process. X-ray diffraction results revealed the formation of single-phase hexagonal wurtzite ZnO for all samples, with successful incorporation of dopant ions without secondary phase formation. The synthesized powders exhibited porous agglomerated morphologies resulting from gas evolution during the combustion process, while FTIR analysis confirmed the formation of Zn–O bonds and the effective removal of organic species after calcination. Optical characterization demonstrated that transition-metal doping significantly modifies the visible and near-infrared reflectance properties of ZnO pigments, producing green Co-doped and black-brown Mn-doped pigments with relatively high NIR solar reflectance. These results indicate that bio-fuel-assisted combustion synthesis provides a simple and effective route for producing functional ZnO-based pigments with tunable optical properties for potential application in thermally functional coating materials.</p></div>","PeriodicalId":595,"journal":{"name":"International Journal of Self-Propagating High-Temperature Synthesis","volume":"35 3","pages":"165 - 172"},"PeriodicalIF":0.6,"publicationDate":"2026-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148962021","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}

{"title":"Combustion Synthesis of W–Ni Alloy from Nickel Tungstate","authors":"M. Zakaryan,&nbsp;N. Amirkhanyan,&nbsp;T. Minasyan,&nbsp;S. Kharatyan","doi":"10.3103/S1061386226700123","DOIUrl":"10.3103/S1061386226700123","url":null,"abstract":"<p>Tungsten–nickel (W–Ni) alloys are promising materials for advanced structural and functional applications due to their unique combination of mechanical, thermal, and magnetic properties. However, their synthesis remains challenging because of the large differences in melting points and limited mutual solubility of the constituent metals. In this study, a magnesiocarbothermic combustion synthesis route for the preparation of W–Ni alloys using nickel tungstate (NiWO₄) as a precursor was proposed and systematically investigated. Thermodynamic calculations were performed to evaluate the feasibility of complete metal reduction and to identify optimal magnesium and carbon contents, resulting in the construction of phase domain diagrams for the NiWO₄–Mg–C system. Nickel tungstate was synthesized via conventional furnace treatment and solution combustion synthesis (SCS), enabling assessment of precursor microstructure effects on combustion characteristics and alloy formation. Experimental results showed that the combined use of magnesium and carbon enables controlled reduction under milder temperature conditions, leading to refined microstructures. The product exhibited significantly improved compositional homogeneity compared to alloys produced from individual oxide mixtures. The use of SCS-derived NiWO₄ resulted in a porous, foam-like alloy morphology with grain sizes down to ~30 nm. The proposed approach provided an efficient and tunable pathway for the synthesis of homogeneous W–Ni alloys with controlled microstructure.</p>","PeriodicalId":595,"journal":{"name":"International Journal of Self-Propagating High-Temperature Synthesis","volume":"35 3","pages":"192 - 200"},"PeriodicalIF":0.6,"publicationDate":"2026-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148962151","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}

{"title":"Combustion-Driven Formation of Fe–Ni Magnetic Materials","authors":"A. Zurnachyan,&nbsp;Kh. Nazaretyan,&nbsp;S. Aydinyan,&nbsp;S. Kharatyan","doi":"10.3103/S1061386226700111","DOIUrl":"10.3103/S1061386226700111","url":null,"abstract":"<p>Achieving bulk nanocrystalline Fe–Ni-based alloys with controlled microstructure and magnetic performance still remains a major challenge. Here, we demonstrate a rapid, energy-efficient route to fabricate Fe₄Al₄Ni₈B_γ alloys via self-propagating high-temperature synthesis (SHS) approach guided by compositional design and thermal analysis. High-speed temperature scanning (HSTS) revealed the formation of Fe–Al–Ni–B alloy at ~1070°C, with no phase transformation occurring up to 1700°C. Guided by the results of HSTS modeling experiments, the synthesis of the bulk Fe–Ni–Al–B alloy was successfully performed in a controlled combustion mode. Substitutional aluminum and interstitial boron enabled controlled phase evolution and microstructural refinement during ultrafast, liquid-phase-assisted reactions. Higher aluminum content was found to enhance the system reactivity, thereby promoting the formation of a more homogeneous product. Magnetic measurements showed soft magnetic behavior with low coercivity and saturation magnetization of ~30 emu/g, consistent with values reported for similar systems, and tunable via boron content. Notably, interstitial boron stabilized ordered phases within the Fe–Ni–Al lattice without forming hard borides, enhancing magnetic softness.</p>","PeriodicalId":595,"journal":{"name":"International Journal of Self-Propagating High-Temperature Synthesis","volume":"35 3","pages":"182 - 191"},"PeriodicalIF":0.6,"publicationDate":"2026-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148962153","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}

{"title":"Spherical Ultra-Refractory Carbide Ta4HfC5 Powder via Combined SHS and Plasma Spheroidization Approach","authors":"I. E. Semenchuk,&nbsp;A. N. Gryadunov","doi":"10.3103/S1061386226700160","DOIUrl":"10.3103/S1061386226700160","url":null,"abstract":"","PeriodicalId":595,"journal":{"name":"International Journal of Self-Propagating High-Temperature Synthesis","volume":"35 3","pages":"242 - 244"},"PeriodicalIF":0.6,"publicationDate":"2026-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148962149","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}

{"title":"Self-Propagating High-Temperature Synthesis of Aluminum Oxynitride for Transparent Ceramics","authors":"T. G. Akopdzhanyan","doi":"10.3103/S1061386226700135","DOIUrl":"10.3103/S1061386226700135","url":null,"abstract":"<p>Aluminum oxynitride (AlON) powders were prepared by self-propagating high-temperature synthesis (SHS) at nitrogen pressures from 0.5 to 8 MPa using magnesium perchlorate as an oxidizer to enhance combustion of Al–Al₂O₃ mixture. The combustion temperature increased linearly with oxidizer content, reaching ~1850°C, while the front velocity rose exponentially to 4.5 mm/s at 8 MPa. The most significant growth in temperature and velocity occurred between 0.5 and 2 MPa due to improved filtration and accelerated nitridation; further pressure increase led to slower growth. Single‑phase AlON was obtained at temperatures above 1800°C, requiring ≥8 MPa nitrogen pressure and &gt;5 wt % aluminum for oxidation. Pressureless sintering at 1930°C for 10 h yielded 1.5 thick ceramics with over 64% in‑line transmittance at 3900–4600 nm, confirming the feasibility of producing transparent AlON from SHS powders synthesized at moderate nitrogen pressures (≤10 MPa).</p>","PeriodicalId":595,"journal":{"name":"International Journal of Self-Propagating High-Temperature Synthesis","volume":"35 3","pages":"201 - 206"},"PeriodicalIF":0.6,"publicationDate":"2026-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148962154","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}