Inorganic Materials最新文献

{"title":"Refined Method for Estimating the Interlayer Shear Modulus by Correcting the Deflection of Polymer Composite Specimens","authors":"A. N. Polilov, D. D. Vlasov, N. A. Tatus","doi":"10.1134/s0020168524700183","DOIUrl":"https://doi.org/10.1134/s0020168524700183","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The shear and interlayer characteristics of polymer fiber composites, in contrast to metals, play a decisive role in the deformation and fracture processes. In view of this, special methods have been developed to determine the interlayer flexional strength of a short beam and the interlayer shear modulus by the deflection correction. At the same time, the accepted hypotheses about the distribution of shear stresses, for example, those based on the Zhuravsky formula, are too simple and do not provide the determination of the correction and calculation of the shear modulus with a high accuracy. The use of the Saint-Venant–Lekhnitzky solution for an orthotropic beam instead of the simplest parabolic distribution potentially makes it possible to take into account all shear stresses occurring in a beam and their distribution over the beam height and width, which should increase the accuracy of determining the deflection correction and interlayer shear modulus, respectively. Since the strict solution is presented in a series of hyperbolic functions, its practical use is rather difficult. In this study, an exact approximation of the strict solution by simpler quadratic dependences is proposed, which makes it possible to determine the deflection correction and shear modulus with a high accuracy. It is shown using the proposed approximation that, for real beam-type composite specimens, the use of the refined shear stress distribution with allowance for the nonuniformity of stresses over the beam width yields a deflection correction negligibly small as compared with the case of the simplified parabolic distribution according to the Zhuravsky formula. The numerical verification using the finite element method has been carried out. Special three-point bending tests of fiberglass specimens of different widths have also showed no deflection growth with increasing beam width, which points out an insignificant impact of the heterogeneity of shear stresses on the deflection.</p>","PeriodicalId":585,"journal":{"name":"Inorganic Materials","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141865397","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":"Fields of Residual Stresses near Open Assemblage Holes of Aircraft Wing Panel","authors":"S. I. Eleonsky, M. D. Zaitsev, Yu. G. Matvienko, V. S. Pisarev","doi":"10.1134/s0020168524700298","DOIUrl":"https://doi.org/10.1134/s0020168524700298","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The results of fatigue tests of two geometrically identical and similar in design models of the lower wing panel of a commercial aircraft were analyzed. The panels differed in the way of installing mounting bolts, which connect the skin and stringers. Cold expansion of holes drilled both in the skin and stringer was performed for the first panel before joining. The second panel included no additional treatment after drilling pilot holes and final reaming. The bolts were mounted with an interference fit varying from 1.3 to 2.1% and from 2.9 to 3.2% for the first and the second panel, respectively. Changes in the interference fit were the consequence of a scatter attributed to the presence of a tolerance zone for the diameters of both bolts and mounting holes. A two-step comparison of both technologies was based on the experimental study of residual stress fields. The first stage, being a subject of the present study, included the analysis of residual stress fields arising after removal of the bolts and separation of the skin from stringers. Hole drilling and gradual crack growth were used to determine the components of residual stresses. The deformation response was measured by electronic speckle pattern interferometry. High quality interferograms, which provided a reliable resolution of the interference fringes of ultimate density over the hole edge or directly along the notch borders, were obtained for both ways of local removal of the material. The first (pointwise) method, based on drilling a probe hole, provided a quantitative determination of the residual stress components, starting from 1.4 mm distance from the assemblage hole edge. The second technique implements the crack compliance method of subsequent lengthening of the notch, starting directly from the mounting hole edge. This approach provided for a quantitative analysis of residual stress fields, related to different bolt mounting technologies, proceeding from the comparison of SIF values. A high level of compressive residual stresses near open holes was characteristic for both types of panels. Both experimental approaches showed the benefits of joints, where bolts are mounted into cold-expanded (reinforced) holes. For this case, the estimation of the relaxation parameters of the principal component of residual stresses in the direction of the external load is presented.</p>","PeriodicalId":585,"journal":{"name":"Inorganic Materials","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141865398","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":"Actual Problems of Creating Digital Twins of Machine Engineering Products in Terms of Durability Assessment","authors":"A. V. Erpalov, K. A. Khoroshevskii, I. V. Gadolina","doi":"10.1134/s0020168524700237","DOIUrl":"https://doi.org/10.1134/s0020168524700237","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The global digitalization of production opens new opportunities for predictive diagnostics of the technical condition of mechanical engineering products. The issues attributed to assessing their technical condition, primarily to the determination of the residual life of mechanical engineering products, are considered. Currently, a class of virtual models, digital twins of the residual life, is distinguished. Apart from the functions of monitoring and predicting the stability of structures, they can possess a feedback and control the durability by simulating and optimizing the real technological process, taking into account the possibility of achieving the limit state of the structure. The problems of existing methods of assessing the durability in the time and frequency domains are considered in detail from the viewpoint of using the residual resource of structures as the basis of an algorithmic support of digital twins. We also marked the possible variety of obtaining initial data for assessing the durability, namely, fatigue diagrams of materials for different types and schemes of loading. The fatigue diagram is greatly affected by the loading process (regular, random, or mixed), while in the actual work the nonstationary random loading prevails. The methods used for assessing the durability of nonstationary loading are poorly studied and often resolve into simplification of a nonstationary process. The study is focused on nonstationary loading processes, since the creation of digital twins implies a continuous analysis of the durability of the structure for real operational loads. Other problems that can arise when developing digital twins of structures are also considered and discussed.</p>","PeriodicalId":585,"journal":{"name":"Inorganic Materials","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141865400","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":"Analysis of the Electromagnetic Properties of 2000NN/2000NM Composites with Ferroelectric and Polymer Matrices","authors":"V. G. Kostishin, R. I. Shakirzyanov, I. M. Isaev, E. S. Savchenko, B. M. Skibo","doi":"10.1134/s002016852470016x","DOIUrl":"https://doi.org/10.1134/s002016852470016x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The results of studying the electrical properties of ferrite-dielectric composites containing inclusions of Mn-Zn and Ni-Zn spinel ferrites with the same initial magnetic permeability (grades 2000NM and 2000NN, respectively) and different electrical resistance are presented. Polymer and ceramic dielectrics with different values of dielectric permeability were used as matrices of composites: polystyrene (PS525), polyvinylidene fluoride (grade F2MB), lead zirconate titanate (PZT-21), and barium titanate (TBK-3). Experimental samples of composites were obtained by hot pressing (for a polymer matrix) or cold pressing with a binder (for a ferroelectric ceramic matrix). It has been shown that the radio-absorbing properties of the obtained composites strongly depend on the electrical properties of a dielectric matrix and on the electrical resistivity of a filler. The highest attenuation of electromagnetic waves of 25–27 dB in the frequency range of 4–5 GHz is observed for ferrite-polymer composites with a 2000NM semiconductor filler with a 6-mm-thick radio-absorbing material. For composites filled with a Mn-Zn ferrite, a pronounced shift in the dispersion region of magnetic permeability is also observed, which in turn changes the frequency position of peak radio absorption. For the composites with a ferroelectric matrix, the operating frequency range for both fillers was shifted toward the low-frequency region of 1–4 GHz with maximum attenuation of up to 22 dB at the same thickness of the material. It was experimentally confirmed that, at a weight content <i>C</i>_<i>m</i> of ferrite of 40 wt %, an increase in the dielectric permeability of the matrix results in a decrease in frequency <i>f</i>_c of the center of minimum absorption and in a decrease in minimum reflection coefficient <span>(K_{{{text{refl}}}}^{{min }})</span> at a metallic plate for a 2000NN filler with a high electrical resistance. For the composites with a 2000NM filler, the dependence of <span>(K_{{{text{refl}}}}^{{min }})</span> (ε' of the matrix) passes through a minimum. The obtained composites can be considered as effective radio-absorbing materials for the frequency range of 1–6 GHz with peak attenuation of an electromagnetic wave in the range of 14–27 dB and with the operating frequency band of 1.1–2.5 GHz (at a level less than 10 dB).</p>","PeriodicalId":585,"journal":{"name":"Inorganic Materials","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141865494","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":"Diametral Compression of Short Cylinders with a Central Hole as a Method for Assessing the Tensile Strength of Brittle Materials","authors":"V. Yu. Goltsev, A. V. Osintsev, A. S. Plotnikov, V. I. Polskij","doi":"10.1134/s0020168524700201","DOIUrl":"https://doi.org/10.1134/s0020168524700201","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The possibility of assessing the fracture resistance of brittle materials by testing short cylinders, solid and with a central hole, under diametral compression has been investigated. The computational analysis was performed using the finite element method with the ANSYS program. It was shown that the stress distribution in a disk with a hole is similar to that in a disk without a hole, but it has disturbances caused by the stress concentrator in the form of the hole. The normalized values of the maximum principal stresses for a disk with a hole are more than 5 times higher than those for a disk without a hole. Experimental analysis was carried out by testing short cylinders made of brittle materials—cast iron and graphite—both solid and with a central hole. It was found that the fracture resistance determined by the formula of the ASTM D3967-95a standard is practically the same for solid cast iron specimens, while for graphite specimens it differs by 1.5 times from the true fracture resistance of the materials. When testing specimens of cast iron and graphite with a central hole, the fracture resistance differs from the standard by 1.5 and almost 2.5 times, respectively. The different nature of specimen failure was also noted—slow controlled fracture for cast iron and dynamic fracture for graphite, according to their respective deformation diagrams. As an example, the results of testing real cylindrical specimens with a central hole—uranium dioxide fuel pellets—are presented. It is shown that the results of testing graphite ARV-1 specimens and fuel pellets are in good agreement. Thus, the possibility of testing small short cylinders using the diametral compression scheme for indirect assessment of tensile strength of brittle materials is confirmed. A calculation equation is proposed for the indirect assessment of the tensile strength of brittle materials based on the results of testing small short cylinders with and without a central hole under diametral compression.</p>","PeriodicalId":585,"journal":{"name":"Inorganic Materials","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141865496","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":"Study of the Generalized Curves of the Static and Cyclic Deformation, Damage, and Fracture","authors":"N. A. Makhutov, M. M. Gadenin","doi":"10.1134/s0020168524700195","DOIUrl":"https://doi.org/10.1134/s0020168524700195","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>It is shown that materials on the metal, nonmetal, or composite base under the static and cyclic loading have individual deformation diagrams, which relate stresses and strains. These diagrams are obtained during the standard tensile, compression, torsion, or bending testing of laboratory samples with the detection of forces and deformations of their working parts under loading. In this case, the diagram for a single static deformation in the stress–strain coordinates covers both the elastic deformation region and the elastoplastic deformation region, when deformations are localized in the neck of a loaded sample until its destruction at a critical stress level. It is shown that obtained deformation diagrams are often described by a linear, fractional-linear, and power approximation of the obtained deformation curve. The direct experiments, theory of dislocations, and statistical theory of strength confirm the priority of the power approximation of the investigated diagrams. At the same time, for all construction materials, the generalized deformation diagram in relative coordinates is described by a single power equation with the individual hardening parameter, which is determined experimentally or theoretically from the dependences relating data on the elastic modulus, yield stress, strength, and ultimate plasticity of a material. The cyclic elastoplastic deformation diagrams in the form of plastic hysteresis loops are recorded by analogy with the static tension diagrams with the stress–strain axes in conditional and true relative values. The generalized deformation diagrams for a single static and cyclic loading form a scientific basis for plotting a generalized fatigue curve using the deformation fracture criterion for a wide range of cycles to failure. An effective solution to the strength and service life problems for the most complex engineering objects, such as nuclear reactors, aircraft, and rocket and space systems, can be achieved by considering the generalized deformation and fracture diagrams and relevant calculations. Their importance will especially increase in the design and implementation of new unique high-tech facilities.</p>","PeriodicalId":585,"journal":{"name":"Inorganic Materials","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141865403","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":"On the Reasons for the Premature Failure of Safety Valve Springs in the Equipment of Primary Oil Refining","authors":"M. A. Tupitsin, I. A. Trishkina, E. I. Storozheva","doi":"10.1134/s0020168524700213","DOIUrl":"https://doi.org/10.1134/s0020168524700213","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The reasons for the premature failure of a spring (made of 50KhFA steel) used in the safety valve of the column head part are analyzed. The failure of the spring occurred after 7 years of operation at a temperature below 90°C in a working environment of light oil products (sulfurous gasoline). Visual and measurement control, general chemical analysis of the composition of the steel, energy-dispersive analysis of the metal in local areas, measurements of hardness and microhardness, microstructural analysis of the metal, macro- and electron fractography, phase chemical and X-ray structural analyses, and recovering heat treatment are used for the studies. The characteristic external signs, typical microdamages, and mechanisms of sulfide (hydrogen) corrosion cracking of high-strength 50KhFA steel with the most dangerous accompanying process, hydrogenation, are revealed. The analysis of the chemical composition and hardness of the metal meets the requirements of the standards for this steel. The microstructure of the metal under study is tempered martensite with the presence of a decarburized layer of up to 0.158 mm in the surface layers. The results of the study show that the premature failure of the spring is attributed both to the technological heredity and operational factors (contact with the working environment beyond the design basis). Ulcerative damage of the metal surface with the penetration of corrosion products into the deep layers due to the violation of the integrity of the coating of the spring are noted, which indicates low resistance of 50KhFA steel to low-temperature hydrogen sulfide corrosion. The failure predominantly occurs near nonmetallic inclusions along the boundaries of the primary austenite grains, where the largest precipitates of chromium carbides are located, as well as along the interphase boundaries of oriented carbide plates.</p>","PeriodicalId":585,"journal":{"name":"Inorganic Materials","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141865498","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":"Quantification of Calcium, Phosphorus, and Cerium in Novel Biocompatible Materials by Total Reflection X-Ray Fluorescence Spectroscopy","authors":"A. A. Samoilova, N. V. Petrakova, N. A. Andreeva, T. N. Penkina, S. G. Dorofeev, D. G. Filatova","doi":"10.1134/s0020168524700055","DOIUrl":"https://doi.org/10.1134/s0020168524700055","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>An approach to determining the composition of new biocompatible materials based on cerium-containing calcium phosphates using the TXRF method is proposed. The ranges of analyte contents in solutions were determined for the correct determination of Ca, P, and Ce using the external reference method. A systematic underestimation of the calcium signal was noted when its content in the analyzed composite sample was above 30 mg/L. In order to assess the compliance of the sample with the thin layer criterion, an analysis of the Compton scattering spectra for the ceramic sample solution was carried out; the maximum value was 16.8 keV (96°). According to the plot of the mass attenuation coefficient for a film of a given composition, the attenuation of the intensity of the calcium line perpendicular to the substrate is not associated with absorption of the sample. Internal reference samples (Gd and Cu) were selected and conditions were found for determining micro- and macrocomponents in solutions and suspensions of samples. It has been shown that, when the calcium content in the sample is up to 50 mg/L, it is possible to correctly determine Ca, P, and Ce using the TXRF method in solutions and suspensions with <i>S</i>_<i>r</i> of 0.05 and 0.09, respectively. The convergence of the results obtained using the external and internal reference methods with appropriate dilutions of solutions and suspensions was noted.</p>","PeriodicalId":585,"journal":{"name":"Inorganic Materials","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738962","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":"Assessing the Reliability of the Forensic Technique for the Identification Study of Motor Gasoline Using Gas-Liquid Chromatography","authors":"G. I. Bebeshko, G. G. Omel’yanyuk, O. V. Samoilova, A. I. Usov","doi":"10.1134/s0020168524700134","DOIUrl":"https://doi.org/10.1134/s0020168524700134","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A new approach to solving the problems of forensic examination of petroleum products, fuels, and lubricants associated with establishing whether motor gasoline belongs to a common/different identification variety is proposed. A technique for the identification of gasoline using quantitative results of chromatographic determination of controlled parameters and subsequent evaluation of the results in pairwise compared samples according to the established criteria is developed. The following parameters were selected as controlled parameters: values of research octane number (RON), concentrations of hydrocarbon groups (paraffins, isoparaffins, arenes, naphthenes, olefins) and oxygenates. Their determination was carried out using standardized methods. We used the hardware and software complex of the Chromatec-Crystal 5000 series, including the Chromatec-DHA data processing program. Estimated criteria or decision-making rules regarding the issues posed to an expert were determined to classify gasoline under one product name (generic variety), one production technology (group variety), or a common source of origin (one production batch, storage tank, etc.). The reliability of the method was assessed using a validation procedure consisting of three stages. We used a collection of AI-92 motor gasoline, selected at gas stations of four oil companies during six months of 2022 in various districts of Moscow. At the first stage, the performer analyzed 12 aliquots of each of four gasoline samples (samples that previously belonged to the common volume) at different times. It was established that the quality indicators of the proposed technique (standard deviation of the repeatability and reproducibility, expanded uncertainty, limits of the repeatability and reproducibility) for each of the determined controlled indicators did not exceed the permissible errors established by standardized methods. At the second stage of the experiment, the performer combined 12 test samples into four groups from each manufacturer (one production technology) with three samples of different production times (different batches). By comparing the discrepancies in the measured values of the same controlled indicators between pairs of samples within groups and the discrepancy in average indicators between pairs of groups, the performer establish gasolines manufactured using the same technology; gasolines produced by the same technology, but at different times (different batches); and with a probability of 95%, gasolines having a common source of origin (previously belonging to a common volume). The conclusions of the validation study matched the original data on the samples, which confirmed the correctness of the developed comparison criteria. At the third stage (blind test), the performer examined seven gasoline samples information about the composition and properties of which was not provided to him. The results of the blind test w","PeriodicalId":585,"journal":{"name":"Inorganic Materials","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738954","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":"Express X-Ray Fluorescence Analysis of Technical-Grade Tantalum and Niobium: from Raw Materials to Products","authors":"L. Yu. Mezhevaya, M. N. Filippov, O. I. Lyamina, G. E. Mar’ina, A. A. Arkhipenko, V. B. Baranovskaya","doi":"10.1134/s0020168524700067","DOIUrl":"https://doi.org/10.1134/s0020168524700067","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The available approaches to detecting impurities in Ta- and Nb-based materials involve transferring a sample into a solution with subsequent isolation of impurities. This procedure is quite complicated and time-consuming. Therefore, it is interesting to study the possibilities of direct, in particular, X-ray fluorescence (XRF), analysis of solid samples of these materials. The conventional XRF scheme, which involves the experimental construction of calibration characteristics for each element being determined, requires a large number of reference samples containing a very wide range of impurities. In this work, a preliminary characterization of samples of technical tantalum and niobium and products based on them has been carried out. It is shown that, for initial materials, the XRF method can establish only a significant absence of impurities; however, even for sintered niobium hydride and tantalum powder, XRF can be used for the express estimation of the composition. It is proposed to use a Spectroscan MAX-GVM crystal diffraction spectrometer for the analysis and to construct the calibration using the standard software that implements the fundamental parameter method. In this case, the resulting impurity contents can differ from reference values by one to two orders of magnitude. Such accuracy is often sufficient to adjust the technology. The limits of the XRF detection of impurities in Ta- and Nb-based materials have been established. For the elements determined by K-series lines (from Ti to Co), the detection limits range within 30–60 ppm; for the elements determined by M-series lines (Ta), the detection limit is approximately 200 ppm; and for L-series lines (Nb), it is from 100 to 150 ppm.</p>","PeriodicalId":585,"journal":{"name":"Inorganic Materials","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738961","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}