Journal of Superhard Materials最新文献

{"title":"Effect of Titanium Coating Modification of Diamond Powder Grains on the Formation of a Polycrystalline Composite under High Pressure and High Temperature","authors":"V. O. Vienikov,&nbsp;O. O. Bochechka,&nbsp;O. I. Chernienko,&nbsp;O. S. Osipov,&nbsp;V. V. Bilorusets,&nbsp;A. O. Liamtseva,&nbsp;Yu. O. Melniychuk","doi":"10.3103/S1063457625030104","DOIUrl":"10.3103/S1063457625030104","url":null,"abstract":"<p>Diamond was synthesized in the Mg–Zn–C system under a pressure of 8 GPa and at a temperature of 1800°C. Following chemical purification, titanium was deposited onto the diamond powder grains via chemical vapor deposition. This study examined how the titanium coating affects the densification kinetics and microstructure of the resulting polycrystalline diamond composite. High-pressure sintering of the titanium-coated diamond powder decreased the temperature required for maximum densification by 300°C, compared with uncoated diamond powder.</p>","PeriodicalId":670,"journal":{"name":"Journal of Superhard Materials","volume":"47 3","pages":"193 - 197"},"PeriodicalIF":1.2,"publicationDate":"2025-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145144378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structure and Mechanical Properties of Thick Vacuum TiC Condensates Obtained by Electron Beam Evaporation","authors":"V. G. Grechanyuk,&nbsp;O. V. Matsenko,&nbsp;A. V. Kozyrev,&nbsp;І. M. Grechanyuk,&nbsp;V. O. Shapovalov","doi":"10.3103/S1063457625030025","DOIUrl":"10.3103/S1063457625030025","url":null,"abstract":"<p>This study investigates the feasibility of producing thick condensed TiC-based materials through high-rate electron-beam evaporation–condensation of graphite and titanium in vacuum. The research determines the dependences of density, porosity, and microhardness of both as-deposited and annealed condensates, subjected to a temperature of 1000°C, on the substrate temperature. The analysis of mechanical properties as a function of carbon content in TiC condensates demonstrates that the flexural strength reaches its maximum at a carbon concentration of 12–14 wt %, while microhardness peaks at 18–20 wt %.</p>","PeriodicalId":670,"journal":{"name":"Journal of Superhard Materials","volume":"47 3","pages":"208 - 213"},"PeriodicalIF":1.2,"publicationDate":"2025-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145144380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High-Density Ultrahard Novel Orthorhombic Carbon Allotropes C12 and C16 with Physical Properties Close to Diamond: Structural and DFT Investigations","authors":"Samir F. Matar","doi":"10.3103/S1063457625030050","DOIUrl":"10.3103/S1063457625030050","url":null,"abstract":"<p>Novel orthorhombic carbon allotropes with original topologies: 4⁴<b>T</b>39 C₁₂, <b>mog</b>-C₁₂ and <b>cbs</b>-C₁₆ were devised from crystal structure rationale of <i>C4</i> tetrahedra stacking and connections backed by density functional theory DFT-based calculations of ground state structures and energy derived physical properties. Specifically, the structures were identified with distorted <i>C4</i> tetrahedra versus perfect tetrahedra characterizing diamond, accompanied by small atom-averaged volumes resulting into high densities and subsequent ultra hard mechanical behaviors. Dynamically, the allotropes were found stable with positive frequencies revealed from their phonons represented in band structures. Pertaining thermodynamic properties showed specific heat <i>C</i>_<i>V</i> = <i>f</i>(<i>T</i>) calculated curves close to diamond’s experimental values from literature. The closest agreement with experiment was found for the most cohesive allotrope in the series, <b>cbs</b>-C₁₆, concomitantly with the largest electronic indirect band gap, like diamond. From the investigation, a holistic interrelationship: “crystal structure ↔ mechanical ↔ dynamic ↔ electronic properties” is deducted for carbon materials.</p>","PeriodicalId":670,"journal":{"name":"Journal of Superhard Materials","volume":"47 3","pages":"184 - 192"},"PeriodicalIF":1.2,"publicationDate":"2025-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145144379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diamond Grinding of Ceramic Balls at Varied Geometric Parameters of the Process","authors":"S. V. Sokhan’,&nbsp;V. V. Voznyy,&nbsp;V. H. Sorochenko,&nbsp;O. A. Mykyshchenko","doi":"10.3103/S106345762502008X","DOIUrl":"10.3103/S106345762502008X","url":null,"abstract":"<p>For the diamond grinding of ceramic silicon nitride balls based on a plane with circular feed under oscillation, some results of experimental study on the effect of the geometric parameters of the grinding process on the precision of their shape and the shape of the worn surface of a diamond wheel were reported. The shape accuracy criteria were the diameter variation and the out-of-roundness profile shape factor for ground balls and the radial slope angle of the working surface profile and the rate of change in this angle for the worn wheel surface shape. This effect was described by adequate linear functions of process parameters from the ratio between the quantities of balls on the circumferences of their location and the eccentricity of the location of a field of ball trajectories from the rotation axis of a diamond wheel under constant overlapping between the wheel rotation axis and the outer circumference, on which the balls were placed. The values of geometric parameters, at which the studied ball grinding scheme was reasonable to apply, were given.</p>","PeriodicalId":670,"journal":{"name":"Journal of Superhard Materials","volume":"47 2","pages":"137 - 150"},"PeriodicalIF":1.2,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144135298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermal Explosion Reaction Induced Rapid Deposition of Metal Carbides on the Surface of Diamond Particles","authors":"He Zhao,&nbsp;Yanhong Wang,&nbsp;Yitong Luo,&nbsp;Baoyan Liang","doi":"10.3103/S106345762502011X","DOIUrl":"10.3103/S106345762502011X","url":null,"abstract":"<p>A mixture of metal (Ti, Cr, or W) powders and diamond particles was subjected to vacuum-heat treatment. The high temperature generated by the thermal-explosion reaction of the Ni–Al compact promoted the rapid sublimation of the metal powders, forming a carbide coating. Results showed that these metal elements evaporated rapidly and were deposited onto the surface of the diamond particles after the thermal explosion. The difference carbide coating was formed onto the surface of diamond particles. The carbides that formed in the coating were nanoscale or sub-microscale. Finally, the formation mechanism of coatings was explained from the perspectives of reaction thermodynamics and saturated evaporation pressure.</p>","PeriodicalId":670,"journal":{"name":"Journal of Superhard Materials","volume":"47 2","pages":"114 - 120"},"PeriodicalIF":1.2,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144135499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Facile Preparation of Vanadium Carbide Nanoparticles by a Thermal Reduction Method","authors":"Zixun Huang,&nbsp;Liangbiao Wang,&nbsp;Shunkai Wang,&nbsp;Tinghai Yang,&nbsp;Xiaokai Song,&nbsp;Tao Mei","doi":"10.3103/S1063457625020042","DOIUrl":"10.3103/S1063457625020042","url":null,"abstract":"<p>In this paper, we have synthesized vanadium carbide nanoparticles by a lithium-thermal reduction process at 600°C in a stainless-steel autoclave. The product was characterized by X-ray diffraction (XRD), transmission electronmicroscopy (TEM) and scanning electron microscopy (SEM). X-ray diffraction patterns indicate that the obtained product is cubic phase vanadium carbide.</p>","PeriodicalId":670,"journal":{"name":"Journal of Superhard Materials","volume":"47 2","pages":"121 - 124"},"PeriodicalIF":1.2,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144135296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Polishing of Optotechnical Parts Made of Semiconductor Materials","authors":"Yu. D. Filatov,&nbsp;A. Y. Boyarintsev,&nbsp;O. V. Kolesnikov,&nbsp;S. M. Galkin,&nbsp;V. O. Novgorodtsev,&nbsp;Ya. I. Polupan,&nbsp;O. I. Pylypenko,&nbsp;V. I. Sidorko,&nbsp;S. V. Kovalev","doi":"10.3103/S1063457625020029","DOIUrl":"10.3103/S1063457625020029","url":null,"abstract":"<p>The study of the mechanism of material removal and particle wear in the dispersive phase of a dispersive system during semiconductor material polishing revealed that the formation of slurry nanoparticles and polishing powder wear nanoparticles results from QD-FRET, a Förster resonance energy transfer mediated by quantum materials. The energy transferred between polishing powder particles and the treated surface, as well as the energy of slurry nanoparticles and polishing powder wear nanoparticles, depend parabolically on their most probable sizes, which are interrelated with the effective width of the quantum material’s bandgap. The material removal rate and the intensity of polishing powder wear decrease exponentially as the effective bandgap width increases on the corresponding surfaces. Their ratio, which characterizes the efficiency of using a dispersive system of micro- and nanopowders for semiconductor material polishing, increases linearly with a decrease in the treated surface area and the surface area of polishing powder particles. The results of theoretical calculations of the material removal rate agree well with experimental data on the polishing performance of InSb, SiC, and Ge crystals, with a deviation of 4–5%.</p>","PeriodicalId":670,"journal":{"name":"Journal of Superhard Materials","volume":"47 2","pages":"125 - 136"},"PeriodicalIF":1.2,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144135297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cutting Tool Equipped with a Synthetic Diamond Polycrystal with a Polycrystalline Diamond CVD Coating","authors":"V. I. Gritsyna,&nbsp;K. I. Koshevoy,&nbsp;O. A. Opalev,&nbsp;E. N. Reshetnyak,&nbsp;V. E. Strel’nitskij,&nbsp;A. O. Lyamtseva,&nbsp;A. O. Chumak,&nbsp;S. A. Klymenko,&nbsp;O. O. Bochechka,&nbsp;O. I. Chernienko","doi":"10.3103/S1063457625020030","DOIUrl":"10.3103/S1063457625020030","url":null,"abstract":"<p>This study proposes a thin protective polycrystalline diamond CVD coating for cutting tools equipped with a polycrystalline synthetic diamond material produced via the HP–HT method. The deposition parameters were optimized in a magnetically stabilized glow discharge plasma. The coating was synthesized in a hydrogen–methane mixture at a partial pressure of CH₄ ranging from (2.2–2.7) × 10² Pa. The effect of the temperature of the polycrystalline diamond substrate during deposition on the structure of the synthesized coating was investigated. Results indicate that at temperatures between 1060 and 1150°C, diamond crystals in the coatings exhibit well-defined faceting with rectangular or triangular faces of micrometer-scale dimensions. A further increase in synthesis temperature leads to the formation of less-ordered fine-grained components on the surface of the larger, well-formed diamond crystals. At a deposition temperature of 1110–1150°C, a pilot batch of cutting inserts was fabricated using a polycrystalline synthetic diamond material with a 30-µm-thick polycrystalline diamond CVD coating. The impact of the coating on the performance characteristics of tools equipped with these inserts was evaluated during the machining of AK12M2MGN aluminum alloy and MK90 technical ceramics. Results indicate that the coated tool produced machined surfaces with lower roughness when processing the aluminum alloy, while exhibiting a 1.52–1.75-fold increase in wear resistance when machining technical ceramics. This improvement expands the application range and enhances the efficiency of diamond-polycrystal-equipped tools. The study established a synthesis temperature limit of 1175°C, beyond which the coating develops inferior performance characteristics.</p>","PeriodicalId":670,"journal":{"name":"Journal of Superhard Materials","volume":"47 2","pages":"151 - 158"},"PeriodicalIF":1.2,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144135300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Content and Composition of Intracrystalline Inclusions and Impurities in Low-Strength Diamond Grinding Powders","authors":"H. D. Ilnytska,&nbsp;V. V. Smokvyna,&nbsp;V. I. Lavrinenko,&nbsp;O. B. Loginova,&nbsp;S. O. Lysovenko,&nbsp;V. V. Bilorusets,&nbsp;S. P. Starik","doi":"10.3103/S1063457625020078","DOIUrl":"10.3103/S1063457625020078","url":null,"abstract":"<p>The surface state of low-strength diamond grinding powders synthesized in the Ni–Mn–C system has been studied, and the content and composition of their intracrystalline inclusions and impurities before and after thermochemical treatment in an alkaline melt have been determined. It has been established that, in the incombustible residue of diamond powders, carbon solvent alloy elements are predominant to attain from 93.3 to 58.5% from the total quantity. In the initial fractions in the inclusions and impurities of diamond powders, the ratio between Ni and Mn remains at the level typical for the growth medium composition, but the incombustible residue in magnetic fractions after thermochemical treatment contains more Mn. The content of carbon solvent alloy elements (Mn + Ni) decreases almost by two times in the initial fraction, by 2% in the magnetic fraction, and approximately by 17% in the nonmagnetic fraction. According to X-ray spectral microanalysis data, after treatment at a temperature of 800°С, the first appearing on the surface of diamond crystals are inclusions containing Ni and a small quantity of Mn to be followed by Mn enriched solvent alloy inclusions. The appearance of such inclusions and the sequence of their exposure on the surface is explained by the specifics in the distribution of components in the phases of Ni–Mn–C alloys and the capillary extrusion phenomenon, which is also observed on the surface of diamond crystals synthesized in other growth media after annealing. It has been shown that, after thermochemical treatment in an alkaline melt, the incombustible residue decreases approximately by two times, the incombustible residue content decreases approximately by two times, and the magnetic properties of diamond powders weaken by 1.4 times due to the dissolution of separated inclusions. The diamond crystals containing a lower quantity of intracrystalline impurities and inclusions have a higher strength. The total content of inclusions and impurities in the incombustible residues of diamond grinding powders before and after thermochemical treatment decreases by 2.4 times, and the content of carbon solvent alloy elements in them becomes 1.6 times lower. The content and composition of intracrystalline inclusions in diamond powder samples can be more precisely determined after thermochemical treatment.</p>","PeriodicalId":670,"journal":{"name":"Journal of Superhard Materials","volume":"47 2","pages":"159 - 169"},"PeriodicalIF":1.2,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144135301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rheological Properties of Thermoplastic Slip for Casting Large Thin-Walled Silicon Carbide Ceramics","authors":"V. I. Kushch,&nbsp;V. G. Kulych","doi":"10.3103/S1063457625020054","DOIUrl":"10.3103/S1063457625020054","url":null,"abstract":"<p>The study developed an experimental-computational procedure for investigating the rheological properties of thermoplastic slip. This approach integrates laboratory and computational experiments conducted in parallel to determine viscosity parameters by ensuring agreement between calculated and experimental data. The experimental component employs penetrometry, a method that is simple to implement and does not require specialized equipment. The computational component involves analyzing a model boundary-value problem for the Navier–Stokes equations using the finite element method or applying the analytical model developed in this work. The viscosity characteristics of slip based on paraffin and polydisperse SiC powder enable the prediction of the slip-casting process for large-scale, thin-walled silicon carbide ceramic components.</p>","PeriodicalId":670,"journal":{"name":"Journal of Superhard Materials","volume":"47 2","pages":"85 - 94"},"PeriodicalIF":1.2,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144135497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}