International Journal of Refractory Metals & Hard Materials最新文献_第2页

Microstructure and mechanical properties of refractory high-entropy alloys of NbTaZrMox system NbTaZrMox系难熔高熵合金的组织与力学性能

IF 4.6 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-09-23 DOI: 10.1016/j.ijrmhm.2025.107457

Feng Liu , Xiangyang Shen , Yue Zhang , Fuyu Dong , Binbin Wang , Yanqing Su , Liangshun Luo , Jun Cheng

引用次数: 0

Synthesis of near-spherical W-Cr2O3 composite powders with varying Cr doping levels and their application in cemented carbides 不同Cr掺杂水平近球形W-Cr2O3复合粉末的合成及其在硬质合金中的应用

IF 4.6 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-09-22 DOI: 10.1016/j.ijrmhm.2025.107456

Bin Li , Hongyu Ren , Shengda Guo , Jianbo Zhang , Zhihui Zhou , Bin Zeng , Xiangfei Guo

{"title":"Synthesis of near-spherical W-Cr2O3 composite powders with varying Cr doping levels and their application in cemented carbides","authors":"Bin Li , Hongyu Ren , Shengda Guo , Jianbo Zhang , Zhihui Zhou , Bin Zeng , Xiangfei Guo","doi":"10.1016/j.ijrmhm.2025.107456","DOIUrl":"10.1016/j.ijrmhm.2025.107456","url":null,"abstract":"<div><div>Tungsten powder is an essential raw material for producing tungsten carbide powders and tungsten-based alloys. However, the fabrication of high-performance spherical tungsten powders remains costly, and achieving a uniform distribution of doped elements poses significant challenges. In this study, a molecularly homogeneous W-Cr precursor solution was prepared using soluble salts, namely ammonium metatungstate ((NH<sub>4</sub>)<sub>6</sub>[H<sub>2</sub>W<sub>12</sub>O<sub>40</sub>]·xH<sub>2</sub>O)) and ammonium chromate ((NH<sub>4</sub>)<sub>2</sub>CrO<sub>4</sub>). Near-spherical W-Cr<sub>2</sub>O<sub>3</sub> composite powders with various Cr doping contents were synthesized through spray drying, calcination, and low-temperature hydrogen reduction. Subsequently, WC-10Co-xCr cemented carbides were fabricated via spark plasma sintering (SPS) following carburization. The effects of reduction temperature and Cr content on the morphology and phase composition of the W-Cr<sub>2</sub>O<sub>3</sub> composite powders were systematically examined. In addition, the influence of Cr doping on the mechanical properties of the cemented carbides was preliminarily evaluated. The results reveal that, at a reduction temperature of 900 °C and a Cr doping level of 0.5 wt%, the W-Cr<sub>2</sub>O<sub>3</sub> composite powders exhibit a uniform near-spherical morphology with fine and consistent particle sizes. The corresponding cemented carbide demonstrates superior overall performance. Furthermore, the Cr element is uniformly dispersed throughout the WO<sub>3</sub> precursor, W-Cr<sub>2</sub>O<sub>3</sub> composite powders, and the final alloy matrix.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"134 ","pages":"Article 107456"},"PeriodicalIF":4.6,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Wear resistance analysis of duplex interpenetrating ceramic composites via in-situ vibration monitoring 基于原位振动监测的双相互穿陶瓷复合材料耐磨性分析

IF 4.6 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-09-19 DOI: 10.1016/j.ijrmhm.2025.107454

Arash Kariminejad , Fabio Auriemma , Maksim Antonov , Piotr Klimczyk , Irina Hussainova

{"title":"Wear resistance analysis of duplex interpenetrating ceramic composites via in-situ vibration monitoring","authors":"Arash Kariminejad , Fabio Auriemma , Maksim Antonov , Piotr Klimczyk , Irina Hussainova","doi":"10.1016/j.ijrmhm.2025.107454","DOIUrl":"10.1016/j.ijrmhm.2025.107454","url":null,"abstract":"<div><div>Advanced industries demand solutions that provide a deep understanding of the complex tribological behavior of high-performance materials, particularly under extreme wear conditions such as those encountered in dry machining, to ensure reliability, efficiency, and extended component lifespan. This study presents a comprehensive investigation into the wear resistance behavior of duplex interpenetrating ceramic composites (DIPCCs) under dynamic loading conditions, utilizing an in-situ vibration monitoring approach. Four types of composites with “duplex” oxide-carbide structure were prepared by spark plasma sintering (SPS) and tested for tribological behavior. Each of these materials contained oxide phases (58 vol%) Al<sub>2</sub>O<sub>3</sub> and ZrO<sub>2</sub> in a constant proportion and one or two of the following carbides (42 vol%): TiC, WC, and ZrC. A custom-designed tribometer was employed to simulate sliding wear, integrated with high-sensitivity accelerometers and vibration analysis software to enable real-time monitoring of wear-induced vibrational signatures. The wear behavior was correlated with material degradation characteristics, surface morphology evolution, and vibration signal patterns. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) were used post-test to characterize wear surfaces and mechanisms. The wear behavior of the composites was analyzed using the Fast Fourier Transform (FFT) of real-time acceleration data collected at three distinct stages of the wear test: the beginning, middle, and end. Among the tested materials, the composite containing 42vol.%WC exhibited the highest mechanical properties and the lowest wear rate of 6.6 × 10<sup>−9</sup>mm<sup>3</sup>m<sup>−1</sup> N<sup>−1</sup>. In contrast, composite with ZrC demonstrated the poorest performance, with the highest wear rate nearly 64 times higher than that of the WC-based.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"134 ","pages":"Article 107454"},"PeriodicalIF":4.6,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145109380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Formation mechanism of in situ continuous gradient in the near surface of WC-6Co cemented carbide tool materials via spark plasma sintering 放电等离子烧结WC-6Co硬质合金刀具材料近表面原位连续梯度的形成机理

IF 4.6 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-09-18 DOI: 10.1016/j.ijrmhm.2025.107452

Yansong Yu , Mingdong Yi , Ting Shan , Jiaxiang Wang , Hui Chen , Jingjie Zhang , Guangchun Xiao , Zhaoqiang Chen , Chonghai Xu

{"title":"Formation mechanism of in situ continuous gradient in the near surface of WC-6Co cemented carbide tool materials via spark plasma sintering","authors":"Yansong Yu , Mingdong Yi , Ting Shan , Jiaxiang Wang , Hui Chen , Jingjie Zhang , Guangchun Xiao , Zhaoqiang Chen , Chonghai Xu","doi":"10.1016/j.ijrmhm.2025.107452","DOIUrl":"10.1016/j.ijrmhm.2025.107452","url":null,"abstract":"<div><div>A novel WC-6Co cemented carbide tool materials was prepared by spark plasma sintering (SPS), regulating sintering pressure and leveraging high-temperature liquid-phase diffusion to control the concentration distribution of the metallic phase to form a near-surface continuous gradient structure. The results indicate that Co with lower melting point spontaneously migrates from the surface to the subsurface under high-temperature liquid-phase diffusion mechanisms in response to pressure variations, thereby in situ forming a continuous gradient structure with varying metallic concentrations near the tool surface. The reduced metallic content at the tool surface resulted in enhanced surface hardness (16.07 ± 0.27 GPa) and the formation of residual compressive stress. A Co-rich region was observed in the subsurface, effectively suppressing microcrack formation. At the optimal sintering temperature of 1200 °C, the fracture toughness of the subsurface and flexural strength of the material reached 23.20 ± 0.37 MPa·m<sup>1/2</sup> and 2094.64 ± 83 MPa, respectively, representing improvements of 18.61 % and 7.78 % compared to homogeneous counterparts. Dry machining tests on isostatically pressed Al<sub>2</sub>O<sub>3</sub> green ceramics demonstrated that the developed WC-6Co tool achieved a 17.8 % reduction in cutting force, a 14.9 % decrease in cutting temperature, and a 10.3 % extension in tool life relative to conventionally sintered tools.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"134 ","pages":"Article 107452"},"PeriodicalIF":4.6,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145109381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis of high-entropy diboride TiZrNbHfTaB2 by vacuum-free direct current arc plasma method 无真空直流电弧等离子体法制备高熵二硼化物TiZrNbHfTaB2

IF 4.6 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-09-18 DOI: 10.1016/j.ijrmhm.2025.107417

A.Ya. Pak, P.V. Povalyaev, A.V. Vlasov, R.D. Gerasimov, Zh.S. Bolatova, A.A. Svinukhova, A.V. Spodina, Y.Z. Vassilyeva

{"title":"Synthesis of high-entropy diboride TiZrNbHfTaB2 by vacuum-free direct current arc plasma method","authors":"A.Ya. Pak, P.V. Povalyaev, A.V. Vlasov, R.D. Gerasimov, Zh.S. Bolatova, A.A. Svinukhova, A.V. Spodina, Y.Z. Vassilyeva","doi":"10.1016/j.ijrmhm.2025.107417","DOIUrl":"10.1016/j.ijrmhm.2025.107417","url":null,"abstract":"<div><div>The study is the first to demonstrate the potential for synthesizing micro- and nanosized particles of high-entropy boride (HEB) TiZrNbHfTaB<sub>2</sub> by vacuum-free electric arc method. Arcing induces the formation of carbon monoxide and carbon dioxide, providing a self-shielding effect of the reaction volume from atmospheric oxygen, which shifts the reaction towards boride formation. The synthesis product was identified as a solid solution with the AlB<sub>2</sub>-type hexagonal lattice, containing atoms of titanium, zirconium, niobium, hafnium, and tantalum. The lattice parameters of the HEB TiZrNbHfTaB<sub>2</sub> phase were a = 3.1045 Å and c = 3.3775 Å. The analysis of the synthesis product revealed agglomerates of micron-sized particles consisting of individual particles, as well as nanosized particles. Bulk ceramic samples were fabricated by spark plasma sintering. The optimal sintering parameters were as follows: 2000 °C, 10 MPa, 5 min at a heating rate of 100 °C/min. Studies were conducted to determine the mechanical and thermophysical properties of the bulk HEB sample.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"134 ","pages":"Article 107417"},"PeriodicalIF":4.6,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sintering behavior and mechanical properties of spark plasma-sintered ZrB2 with the addition of boron nitride nanotubes 添加氮化硼纳米管的火花等离子体烧结ZrB2的烧结行为和力学性能

IF 4.6 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-09-18 DOI: 10.1016/j.ijrmhm.2025.107453

Seungyun Lee , Byeongho Ahn , Hunsu Lee , Hyeondeok Jeong , Hoo-Jeong Lee , Sung-Soo Ryu

{"title":"Sintering behavior and mechanical properties of spark plasma-sintered ZrB2 with the addition of boron nitride nanotubes","authors":"Seungyun Lee , Byeongho Ahn , Hunsu Lee , Hyeondeok Jeong , Hoo-Jeong Lee , Sung-Soo Ryu","doi":"10.1016/j.ijrmhm.2025.107453","DOIUrl":"10.1016/j.ijrmhm.2025.107453","url":null,"abstract":"<div><div>Zirconium diboride (ZrB₂) is a promising ultrahigh temperature ceramic (UHTC) for aerospace applications due to its high thermal conductivity and oxidation resistance, but its low fracture toughness restricts broader use. In this study, boron nitride nanotubes (BNNTs) were incorporated into ZrB₂ matrices using spark plasma sintering (SPS) across a wide range of temperatures (1300–2000 °C) and BNNT contents (0–5 wt%), extending beyond the narrow conditions explored in prior reports. X-ray diffraction and scanning electron microscopy revealed that BNNTs partially transformed into h-BN above 1300 °C, coexisting with residual nanotubes at intermediate temperatures, and were uniformly distributed along ZrB₂ grain boundaries at higher temperatures. The BN phases located at grain boundaries effectively suppressed ZrB₂ grain growth, leading to a refined microstructure. High-resolution TEM further identified a thin amorphous interfacial layer at the ZrB₂/BN boundary, which, together with h-BN platelets, promoted crack deflection, delamination, and interfacial debonding. Quantitative crack path analysis confirmed these mechanisms collectively enhanced toughness, raising the fracture toughness of the 5 wt% BNNT composite to 6.2 MPa·m<sup>0.5</sup>—more than double that of monolithic ZrB₂. Despite reduced hardness and thermal conductivity at higher BNNT contents, the uniformly distributed BN phases provided effective toughening. This study systematically establishes the microstructural evolution and toughening mechanisms of ZrB₂–BNNT composites, offering practical guidelines for designing tougher UHTCs.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"134 ","pages":"Article 107453"},"PeriodicalIF":4.6,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessment of thermal conductivity in rolled pure molybdenum after ultra-high temperature exposure via frequency-domain thermoreflectance 用频域热反射评价轧制纯钼在超高温暴露后的导热性

IF 4.6 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-09-17 DOI: 10.1016/j.ijrmhm.2025.107451

Lihua Guo , Xiyang Liu , Jinpeng Zhang , Hongbang Zhang , Xiaokun Gu , Linyuan Lu , Haibing Zhang , Jinwei Zhan

{"title":"Assessment of thermal conductivity in rolled pure molybdenum after ultra-high temperature exposure via frequency-domain thermoreflectance","authors":"Lihua Guo , Xiyang Liu , Jinpeng Zhang , Hongbang Zhang , Xiaokun Gu , Linyuan Lu , Haibing Zhang , Jinwei Zhan","doi":"10.1016/j.ijrmhm.2025.107451","DOIUrl":"10.1016/j.ijrmhm.2025.107451","url":null,"abstract":"<div><div>Mo-UO₂ cermet dispersed fuel stands out as one of the highly promising solid-state fuels for nuclear thermal propulsion (NTP) systems. As the matrix material, the thermal conductivity of Mo is a critical parameter that not only dictates the temperature distribution within the fuel elements and dissipates heat rapidly but also plays a pivotal role in preserving the structural integrity and stability of the reactor core. Therefore, this study presents the pioneering implementation of Frequency-Domain Thermoreflectance (FDTR) technique to investigate the evolution of thermal conductivity in rolled pure Mo subjected to annealing from room temperature (RT) to 2300 °C. The results revealed a gradual decline in thermal conductivity with increasing annealing temperature, decreasing from 176.00 W/(m·K) at RT to 143.33 W/(m·K) at 2100 °C. A notable abrupt drop occurred at 2300 °C, where the thermal conductivity plummeted to 71.47 W/(m·K), corresponding to a 60 % decrease of its RT baseline. Microstructural characterization revealed a pronounced transition in grain morphology, evolving from initially elongated to equiaxed configurations upon post-annealing treatment, concomitant with substantial grain coarsening. Remarkably, annealing at 2300 °C facilitated the nucleation and growth of polyhedral gas bubbles with sizes spanning the nano-to-micrometer range within the Mo matrix. These bubbles acted as thermal resistance barriers by creating localized gas-filled regions that impeded lattice heat conduction, thereby accounting for the sharp decline in thermal conductivity at 2300 °C. This study systematically elucidates the thermal conductivity evolution of rolled pure Mo under ultra-high-temperature atmosphere, thus providing critical feedback for optimizing the fabrication conditions of matrix materials.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"134 ","pages":"Article 107451"},"PeriodicalIF":4.6,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145109379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","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 printing gap in fused filament fabrication of cemented carbide on thermal debinding effectiveness 硬质合金熔丝加工中印刷间隙对热去胶效果的影响

IF 4.6 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-09-15 DOI: 10.1016/j.ijrmhm.2025.107447

Yulu Li , Linglong Rong , Haoyang Zhang , Dongyu Wu , Jingjing Wu , Shaohe Zhang , Xiangwang Kong

{"title":"Influence of printing gap in fused filament fabrication of cemented carbide on thermal debinding effectiveness","authors":"Yulu Li , Linglong Rong , Haoyang Zhang , Dongyu Wu , Jingjing Wu , Shaohe Zhang , Xiangwang Kong","doi":"10.1016/j.ijrmhm.2025.107447","DOIUrl":"10.1016/j.ijrmhm.2025.107447","url":null,"abstract":"<div><div>Fused Filament Fabrication (FFF) provides an efficient solution for manufacturing cemented carbide parts with complex structures. However, the printing process introduces pore structures within the green body, which can lead to debinding defects during subsequent thermal debinding. To ensure the structural integrity of printed components, this study compares and analyzes the pore structures introduced by different printing paths in high-density cemented carbide parts. A thermal debinding pressure model and experiments were used to investigate the influence of printing gaps on debinding effectiveness. Results show that different printing paths lead to variations in pore structure and porosity. Linear infill produces the densest green body, while hexagonal infill results in the highest porosity. During thermal debinding, the pores introduced by printing serve as the primary channels for binder decomposition. Longer gas transmission paths in linear infill cause significant pressure buildup at pipeline ends, exceeding the green body's strength and leading to cracking. Debinding rate results indicate that printing gaps primarily affect the debinding effectiveness of cemented carbide parts but have minimal impact on the overall debinding rate of the green body.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"134 ","pages":"Article 107447"},"PeriodicalIF":4.6,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145109482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microstructure of spherical W-Ni-Fe prealloy powder prepared by spray granulation and debinding sintering combined with radiofrequency plasma spheroidization 喷雾造粒和脱脂烧结结合射频等离子体球化法制备球形W-Ni-Fe预合金粉末的显微组织

IF 4.6 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-09-15 DOI: 10.1016/j.ijrmhm.2025.107448

Zhenyu Gao , Liangliang He , Guopeng Duan , Xinhua Mao , Zhixue Liu , Jian Chen

{"title":"Microstructure of spherical W-Ni-Fe prealloy powder prepared by spray granulation and debinding sintering combined with radiofrequency plasma spheroidization","authors":"Zhenyu Gao , Liangliang He , Guopeng Duan , Xinhua Mao , Zhixue Liu , Jian Chen","doi":"10.1016/j.ijrmhm.2025.107448","DOIUrl":"10.1016/j.ijrmhm.2025.107448","url":null,"abstract":"<div><div>This study addresses the limitations of conventional W-Ni-Fe prealloyed powder preparation processes, such as low sphericity, high oxygen content, and elemental segregation, by developing an integrated spray granulation-debinding-sintering-(RF) plasma spheroidization process. This methodology meets the stringent requirements of additive manufacturing for high-performance powders. Through systematic optimization of spray granulation parameters (atomizer speed:10,000 rpm; inlet air temperature 150 °C; outlet air temperature 60 °C), near-spherical agglomerates with a flowability of 18.5 s/50 g were obtained. Subsequent debinding-sintering (debinding at 500 °C under negative pressure for 1.5 h, sintering at 1000 °C) effectively removed organic residues and enhanced densification. Final radio-frequency plasma spheroidization (feeding rate:7.8 g/min, carrier gas flow:3.0 L/min, Chamber press-ure:13.5 psi) achieved >95 % sphericity, oxygen content ≤200 ppm, flowability of 6.13 s/50 g and an apparent density of 10 g/cm<sup>3</sup>, with volatilization losses of 53.9 % for Ni and 55.9 % for Fe. The optimized powders exhibit homogeneous elemental distribution,66.9 % improved flowability compared to agglomerated powders, and a 75 % increase in apparent density with a narrowed particle size distribution, effectively mitigating the drawbacks of conventional powders. The composite process demonstrates sequential control of powder morphology and elemental homogeneity, producing high-performance W-Ni-Fe prealloyed powders suitable for extreme environments (nuclear reactors). This breakthrough provides a robust material solution for advanced additive manufacturing applications.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"134 ","pages":"Article 107448"},"PeriodicalIF":4.6,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145106714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The effect of hBN additive on the microstructure and mechanical properties of sialon ceramics hBN添加剂对sialon陶瓷显微组织和力学性能的影响

IF 4.6 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-09-15 DOI: 10.1016/j.ijrmhm.2025.107450

Daiheng Li , Ping Zhang , Ziyao Wei , Xiaoyu Xu , Jie Xu , Feng Gao

{"title":"The effect of hBN additive on the microstructure and mechanical properties of sialon ceramics","authors":"Daiheng Li , Ping Zhang , Ziyao Wei , Xiaoyu Xu , Jie Xu , Feng Gao","doi":"10.1016/j.ijrmhm.2025.107450","DOIUrl":"10.1016/j.ijrmhm.2025.107450","url":null,"abstract":"<div><div>While ceramic cutting tools currently offer significant advantages, the complex microstructure and inherent grain growth mechanism of ceramic materials severely limits their application. In this work, Y<sub>m/3</sub>Si<sub>12-(m+n)</sub>Al<sub>m+n</sub>O<sub>n</sub>N<sub>16-n</sub> (Sialon, m = 1.2, <em>n</em> = 1.0) ceramics with hexagonal boron nitride (hBN) additive were fabricated by spark plasma sintering. The effect of the particle size and the content of hBN on the microstructure, the hardness, and the fracture toughness of Sialon ceramics have been investigated. The results indicate that the properties of hBN/Sialon materials initially improve followed by a decline as the hBN particle size increases, with the optimal performance observed at a medium particle size (4–6 μm). hBN particulates within Sialon grains, intergranular Y-rich glassy phases and fibrous carbon-rich Sialon-C whiskers were observed. As the hBN doping content increased, both the hardness and fracture toughness of the material decreased, which is attributed to weak interfacial cracking, crack coalescence, and stress-concentration-induced whisker failure by the complex microstructure. The best-performing sample was doped with 2 wt% of 4–6 μm hBN, achieving a hardness of 25.1 GPa and a fracture toughness of 5.0 MPa·m<sup>1/2</sup>.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"134 ","pages":"Article 107450"},"PeriodicalIF":4.6,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145106776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0