International Journal of Refractory Metals & Hard Materials最新文献_第10页

WO3/TiO2 composite coatings on titanium: A comprehensive review of fabrication strategies and structure/property/performance correlations in visible-light photocatalysis 二氧化钛上的WO3/TiO2复合涂层：制备策略和可见光催化结构/性能/性能相关性的综合综述

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials

Pub Date : 2026-04-01 Epub Date: 2025-12-17 DOI: 10.1016/j.ijrmhm.2025.107630

Haniye Salimi , Arash Fattah-alhosseini , Kazem Babaei , Burak Dikici , Mosab Kaseem

Visible-light-driven photocatalysis continues to face major limitations due to insufficient light absorption and rapid charge recombination in conventional TiO₂-based systems. Integrating WO₃ with TiO₂ has emerged as a promising strategy to overcome these constraints by enhancing visible-light responsiveness and improving charge carrier dynamics. Accordingly, this review addresses the central research question: How do different fabrication routes of WO₃/TiO₂ composite coatings influence their structural features and, consequently, their photocatalytic performance under visible light? The review critically surveys recent studies on the manufacture of WO₃/TiO₂ composite coatings, with a special focus on how different preparation processes such as sol–gel, anodizing, plasma electrolytic oxidation (PEO), and hybrid routes affect their structures, optical properties, and photocatalytic activities. The formation of effective WO₃/TiO₂ heterojunctions improves carrier separation and extends light absorption, leading to significant degradation of organic pollutants or enhanced water-splitting performance. Particular attention is given to the role of morphological parameters, such as porosity, surface area, crystalline phase composition, and nanoparticle dispersion, in dictating photocatalytic activity. A comparative summary of structure–property–performance correlations is provided through examination of a broad range of experimental studies. It outlines the challenges that now exist in optimizing WO₃/TiO₂ systems in real-world environmental and energy applications. The findings presented here form the basis for rationalizing next-generation visible-light-responsive photocatalysts.

可见光驱动的光催化仍然面临着主要的限制，因为传统的tio2基系统光吸收不足和快速电荷重组。通过增强可见光响应性和改善载流子动力学，将WO3与TiO2集成成为克服这些限制的一种有希望的策略。因此，本综述解决了研究的核心问题：WO3/TiO2复合涂层的不同制备路线如何影响其结构特征，从而影响其在可见光下的光催化性能？本文综述了WO3/TiO2复合涂层的最新研究进展，重点介绍了溶胶-凝胶、阳极氧化、等离子体电解氧化（PEO）和杂化等不同制备工艺对其结构、光学性能和光催化活性的影响。有效的WO3/TiO2异质结的形成改善了载流子分离，扩大了光吸收，从而显著降解有机污染物或增强了水分解性能。特别注意形态参数的作用，如孔隙率，表面积，晶相组成，和纳米颗粒分散，在决定光催化活性。通过对广泛的实验研究的考察，提供了结构-性能-性能相关性的比较总结。它概述了在现实环境和能源应用中优化WO3/TiO2体系目前存在的挑战。本文提出的研究结果为下一代可见光响应光催化剂的合理化奠定了基础。

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引用次数: 0

Novel WC-based cemented carbides with Fe-Cr-V binders with improved fracture toughness for neutron shielding applications 新型含Fe-Cr-V粘结剂的wc基硬质合金，具有提高断裂韧性的中子屏蔽应用

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials

Pub Date : 2026-04-01 Epub Date: 2025-11-30 DOI: 10.1016/j.ijrmhm.2025.107583

D. Müller , I. Konyashin , B. Ries , J. Pötschke , A. Michaelis

Cemented carbides with high mechanical properties and low neutron activation would be useful for neutron shielding applications. In this work cemented carbides of the WC-Fe-Cr₃C₂-VC system were developed and examined. The Thermo-Calc calculations and experiments were performed to determine the two- or three-phase regions of such cemented carbides. Phase compositions depending on the carbon content were calculated and established experimentally. The two-phase window was found to be very narrow and typical microstructures of the cemented carbides consist of three phases, namely WC, ferrite and cementite. The influence of the Fe content, WC mean grain size and carbon content on physical and mechanical properties of the WC-Fe-Cr₃C₂-VC cemented carbides was investigated. As the binder content, WC mean grain size and carbon content increase, the density and hardness decrease, while the fracture toughness increases. Magnetic properties (coercivity and magnetic saturation) decrease with increasing the WC mean grain size, carbon content and binder content. Fracture toughness of 8 to 9 MPam^1/2, full density and a broad three-phase window of about 0.15 wt% C were established by employing extra-coarse WC and the binder phase composition of 5 %Fe-0.3 %Cr3C2–0.05 %VC.

具有高机械性能和低中子活化的硬质合金可用于中子屏蔽。本文对WC-Fe-Cr3C2-VC体系硬质合金进行了研制和研究。通过热钙计算和实验确定了这种硬质合金的两相区或三相区。通过实验计算和建立了随碳含量变化的相组成。两相窗口非常窄，典型的硬质合金显微组织由WC、铁素体和渗碳体三相组成。研究了Fe含量、WC平均晶粒尺寸和碳含量对WC-Fe- cr3c2 - vc硬质合金物理力学性能的影响。随着粘结剂含量、WC平均晶粒尺寸和碳含量的增加，密度和硬度降低，断裂韧性增加。磁性能（矫顽力和磁饱和度）随WC平均晶粒尺寸、碳含量和粘结剂含量的增加而降低。采用超粗WC和5% fe - 0.3% cr3c2 - 0.05% VC的粘结剂相组成，建立了断裂韧性为8 ~ 9mpam /2、全密度和约0.15 wt% C的宽三相窗口。

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引用次数: 0

Fabrication of nanocomposite gradient thermal barrier ceramic cutting tools: modeling, design, and characterization of mechanical-thermal barrier performance 纳米复合梯度热障陶瓷刀具的制造：机械热障性能的建模、设计和表征

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials

Pub Date : 2026-04-01 Epub Date: 2025-12-07 DOI: 10.1016/j.ijrmhm.2025.107608

Chongzhen Du , Chuanzhen Huang , Hanlian Liu , Xinyao Cui , Dun Liu , Zhen Wang , Longhua Xu , Shuiquan Huang

This research aims to develop a new type of nanocomposite gradient-layer ceramic cutting tool that possesses both thermal barrier and wear resistance properties. A thermal barrier performance evaluation model applicable to multi-layer thermal barrier tool materials and a structural parameter optimization model based on thermal barrier performance were established to guide the design of tool materials and structural parameters. A nano-composite gradient thermal barrier ceramic tool material was fabricated using a two-step hot-pressing sintering process. With Ti(C,N)-based cermet as the matrix, a gradient thermal barrier structure composed of Al₂O₃-based, and low thermal conductivity phase nano-ZrO₂ was superimposed on the surface, achieving the coordinated unity of structure and function. The influence relationships of the thermal physical parameters and structural parameters of cutting tool materials on the thermal barrier performance and mechanical properties of the cutting tools were mainly studied. The thermal barrier performance of cutting tools with different structural parameters under constant temperature boundary conditions was quantitatively characterized using the thermal barrier performance evaluation coefficient (

d_{temp}^{*}

). The errors of the model were all within 10 %. The combined simulation results showed that in the dry machining of nickel-based superalloy 718, the TWAZ-7C tool still exhibited excellent high-temperature mechanical properties. At the simulated temperature range (500–750 °C) during the dry machining of Inconel 718, the TWAZ-7C tool still demonstrated excellent high-temperature mechanical properties. This study provided theoretical support for addressing the problem of localized concentration of cutting heat during dry cutting and for the manufacturing of high-performance ceramic cutting tools.

本研究旨在开发一种兼具热障和耐磨性的新型纳米复合梯度层陶瓷刀具。建立了适用于多层热障刀具材料的热障性能评价模型和基于热障性能的结构参数优化模型，用于指导刀具材料和结构参数的设计。采用两步热压烧结工艺制备了纳米复合梯度热障陶瓷刀具材料。以Ti（C，N）基陶瓷为基体，在表面叠加由al2o3基、低导热相纳米zro2组成的梯度热障结构，实现了结构与功能的协调统一。重点研究了刀具材料的热物性参数和结构参数对刀具热障性能和力学性能的影响关系。采用热障性能评价系数（dtemp∗）定量表征了不同结构参数切削刀具在恒温边界条件下的热障性能。模型误差均在10 %以内。联合仿真结果表明，在干式加工镍基高温合金718时，TWAZ-7C刀具仍具有优异的高温力学性能。在干式加工Inconel 718的模拟温度范围（500-750 °C）下，TWAZ-7C刀具仍然表现出优异的高温力学性能。该研究为解决干切削过程中切削热局部集中问题和高性能陶瓷刀具的制造提供了理论支持。

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引用次数: 0

The stress concentration effect of La₂O₃ second-phase particles in molybdenum alloys with the dominant mechanisms La₂O₃第二相颗粒在钼合金中的应力集中效应具有主导机制

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials

Pub Date : 2026-04-01 Epub Date: 2025-12-08 DOI: 10.1016/j.ijrmhm.2025.107617

Shichen Wang , Junzhou Yang , Yongqiang Fang , Hairui Xing , Li Wang , Wenting Ye , Hua Wang , Caihong Chang , Kunming Pan , Ping Hu

This paper systematically investigates the effect of stress concentration induced by second-phase particles on the mechanical properties of molybdenum (Mo) alloys. Three types of Mo alloys were fabricated via powder metallurgy, and their flow behavior, hardness and morphology have been characterized. A stress concentration factor model has been established to quantitatively assess the effect of La₂O₃ second-phase particles on stress concentration. The stress concentration factor model developed considers three factors: the second-phase particle size r, the interparticle spacing a, and the grain size d. Pearson correlation analysis confirmed the above three variables are mutually independent. The analysis of the dominant factors influencing stress concentration reveals the influence order: r > a > d. The effect of different size ranges of r and a on stress concentration varies. Nano-scale second-phase particles (r<10³ nm) exhibit superior strengthening and toughening effects, while for micron-scale second-phase particles (10³ nm < r < 5 × 10⁴ nm), stress concentration can be mitigated by controlling grain coarsening and particle spacing. When r > 5 × 10³ nm, balancing the second-phase particle size and spacing to achieve a dispersed distribution is essential to reduce stress concentration and maintain a favorable strength-toughness balance.

本文系统地研究了第二相颗粒引起的应力集中对钼合金力学性能的影响。采用粉末冶金法制备了三种Mo合金，并对其流动性能、硬度和形貌进行了表征。建立了应力集中因子模型，定量评价了La2O3二相颗粒对应力集中的影响。建立的应力集中因子模型考虑了二相粒径r、粒间间距a和晶粒尺寸d三个因素，Pearson相关分析证实上述三个变量是相互独立的。对影响应力集中的主导因素进行分析，其影响顺序为：r >； a > d。r和a的不同尺寸范围对应力集中的影响是不同的。纳米级第二相颗粒（r<103 nm）表现出优异的强化和增韧效果，而对于微米级第二相颗粒（103 nm < r< 5 × 104 nm），可以通过控制晶粒粗化和颗粒间距来减轻应力集中。当r >； 5 × 103 nm时，平衡第二相粒径和间距以达到分散分布是降低应力集中和保持良好的强度-韧性平衡的必要条件。

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引用次数: 0

In-situ TiN formation and microstructural evolution in WC–Co–Ti composites via gas-phase nitridation and spark plasma sintering 气相氮化和放电等离子烧结WC-Co-Ti复合材料TiN的原位生成和显微组织演化

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials

Pub Date : 2026-04-01 Epub Date: 2025-12-25 DOI: 10.1016/j.ijrmhm.2025.107638

Ammad Ali , Kee-Ryung Park , Yoseb Song , Da-Woon Jeong , Muhammad Aneeq Haq , Bum Sung Kim

This study investigates in-situ TiN formation in WC–Co–Ti composites processed by high-energy ball milling, gas-phase nitridation, and spark plasma sintering (SPS). The optimized composite was consolidated by SPS at a peak temperature of 1250 °C, a holding time of 10 min, and an applied pressure of 50 MPa. Based on XRD phase evolution in nitrided powders and SEM/EDS observations of the consolidated microstructure, a diffusion-assisted formation pathway is proposed, in which nitrogen transport through the binder/interface region promotes TiN formation near Ti-containing domains and WC–binder interfaces. The resulting Ti–N-enriched interfacial regions contribute to localized WC grain-growth suppression and influence fracture behavior through crack deflection at heterogeneous interfaces. The optimized composite achieved a Vickers hardness of ∼1870 HV and a fracture toughness of 6.8 MPa·m¹ᐟ². These results establish gas-phase nitridation combined with SPS as an effective route to introduce Ti–N-enriched interfacial regions and tailor the phase/microstructure of WC–Co-based cemented carbides, leading to an improved hardness–toughness balance.

本研究研究了高能球磨、气相氮化和放电等离子烧结（SPS）处理WC-Co-Ti复合材料中TiN的原位形成。优化后的复合材料在峰值温度为1250℃，保温时间为10 min，施加压力为50 MPa的条件下进行SPS固结。基于氮化粉末的XRD相演化和SEM/EDS对固结微观结构的观察，提出了一种扩散辅助形成途径，其中氮通过粘结剂/界面区域的输运促进了TiN在含ti畴和wc -粘结剂界面附近的形成。由此产生的富ti - n界面区有助于局部抑制WC晶粒生长，并通过非均质界面处的裂纹挠曲影响断裂行为。优化后的复合材料的维氏硬度为~ 1870 HV，断裂韧性为6.8 MPa·m1 2。这些结果表明，气相氮化结合SPS是引入富ti - n界面区域的有效途径，可以调整wc - co基硬质合金的相/微观结构，从而改善硬度和韧性平衡。

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引用次数: 0

Three-body rolling micro-abrasive wear of titanium and polyether-ether-ketone (CFR-PEEK) 钛与聚醚醚酮（CFR-PEEK）三体滚轧微磨粒磨损研究

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials

Pub Date : 2026-04-01 Epub Date: 2025-12-01 DOI: 10.1016/j.ijrmhm.2025.107589

Miguel Martinez-Mondragon , Ezequiel Alberto Gallardo-Hernández , Guillermo Urriolagoitia-Sosa , Beatriz Romero-Ángeles , Javier Alejandro Frias-Flores , Manuel Vite-Torres

Nowadays, dental treatments with implants use novel biomaterials that have not entirely been characterized to give understanding in terms of biological, tribological and mechanical behaviour. On the other hand, dental wear is a complex phenomenon that occurs due to physiological, pathological, oral hygiene and orthodontics causes. However, dental implant performance can be compromised due to possible micro-abrasion wear damage. This work aims to evaluate the three-body rolling micro-abrasive wear resistance of two biomaterials: titanium, which is a material used for implants and polyether-ether-ketone reinforced with carbon fibre (CFR-PEEK). The tests were carried out using a Micro-scale TE 66 wear tester. The applied load was 0.25 N and a sliding speed of 0.1 m/s covering a sliding distance of 10 m (titanium) and 12 m (polyether) respectively at room temperature. The slurry consists of artificial saliva containing SiC abrasive particles, F1200 at 80 % volume. This percentage permitted to obtain the three–body rolling abrasion wear mechanisms in both materials. Besides, the lost volume (V) and wear coefficient (k), were calculated for both materials. In accordance with the results, CFR-PEEK material presented better three-body micro abrasive wear resistance compared to titanium sample. The wear mechanisms were microscopically identified, presenting mainly pitting indicating three-body rolling wear and some brittle areas with some cracks.

目前，种植体牙科治疗使用新型生物材料，这些材料尚未完全表征，无法从生物学、摩擦学和力学行为方面进行理解。另一方面，牙齿磨损是由于生理、病理、口腔卫生和正畸等原因而发生的复杂现象。然而，由于可能的微磨损损伤，牙种植体的性能可能会受到损害。本研究旨在评估两种生物材料的三体滚动微磨料耐磨性：钛（用于植入物的材料）和碳纤维增强聚醚醚酮（CFR-PEEK）。试验使用微型te66磨损试验机进行。在室温下，载荷为0.25 N，滑动速度为0.1 m/s，滑动距离分别为10 m（钛）和12 m（聚醚）。浆料由含有SiC磨料颗粒的人工唾液组成，F1200体积为80%。这个百分比允许在两种材料中获得三体滚动磨损机制。并计算了两种材料的损失体积V和磨损系数k。结果表明，CFR-PEEK材料具有较好的三体微磨粒耐磨性。微观上确定了磨损机理，主要表现为点蚀，表明三体滚动磨损；

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引用次数: 0

Helium-plasma erosion of near-surface (110) and (211) oriented grains in tungsten fuzz layers 钨毛羽层近表面（110）和（211）取向晶粒的氦等离子体侵蚀

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials

Pub Date : 2026-04-01 Epub Date: 2025-11-29 DOI: 10.1016/j.ijrmhm.2025.107575

Hengxin Guo , Zongbiao Ye , Yuqi Shen , Hongrui Tian , Jia Liu , Qingying Yang , Tao Gao

Tungsten, a promising plasma-facing material for future fusion reactors, is susceptible to surface fuzz formation under helium plasma irradiation, leading to performance degradation. This work investigated the erosion behavior of near-surface (110) and (211) oriented grains during fuzz growth by combining XRD results with multi-scale simulations. Density functional theory calculations revealed that the W(110) plane could accommodate up to seven helium interstitial atoms, nearly double that of W(211). And it exhibited higher formation energies for helium clusters and vacancies, indicating superior resistance to bubble rupture. Molecular dynamics simulations showed that helium penetration depth in W(110) was approximately three times greater than in W(211), where the stepped atomic structure of W(211) significantly increased helium migration barriers, promoting shallow-layer accumulation. XRD results were in excellent agreement with simulations: at 122 nm depth, the W(110) diffraction peak dominated, confirming severe near-surface degradation of W(211) grains due to preferential helium bubble nucleation and rupture. At 244 nm depth, the W(110)/W(211) intensity ratio exhibited non-monotonic evolution with fluence, revealing a transition in damage dominance from rapid W(211) degradation to cumulative deep damage in W(110). Beyond 354 nm, the intensity ratio tended to be stabilized and diffraction signal enhanced. It indicated that deeper grains kept the relative structural integrity. These findings demonstrated that helium plasma erosion to near-surface grains of W fuzz exhibited strong crystallographic dependence and depth gradients, forming a structure with a shallow damage zone in W(211) grains and a deep damage zone in W(110) grains.

钨是一种很有前途的未来聚变反应堆的等离子体材料，在氦等离子体照射下，钨的表面容易形成绒毛，导致性能下降。本文将XRD结果与多尺度模拟相结合，研究了近表面（110）和（211）取向晶粒在微晶生长过程中的侵蚀行为。密度泛函理论计算表明，W（110）平面可以容纳多达7个氦间隙原子，几乎是W（211）的两倍。氦团簇和空位的形成能较高，具有较强的抗气泡破裂能力。分子动力学模拟表明，氦在W（110）中的渗透深度约为W（211）的3倍，其中W（211）的阶梯形原子结构显著增加了氦的迁移障碍，促进了浅层积聚。XRD结果与模拟结果非常吻合：在122 nm深度处，W（110）衍射峰占主导地位，证实了由于氦泡优先成核和破裂，W（211）晶粒发生了严重的近表面降解。在244nm深度，W(110)/W（211）强度比随通量的变化呈现非单调变化，表明W（211）的损伤优势由快速降解转变为W（110）的累积深度损伤。在354nm以上，光强比趋于稳定，衍射信号增强。这表明较深的颗粒保持了相对的结构完整性。研究结果表明，氦等离子体对W绒毛近表面晶粒的侵蚀表现出很强的晶体学依赖性和深度梯度，形成了W（211）晶粒浅损伤区和W（110）晶粒深损伤区的结构。

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引用次数: 0

Enhanced oxidation resistance of in-situ TaC/Ni composites by Cr2O3–CrTaO4 network in oxide scale 氧化层中Cr2O3-CrTaO4网络增强原位TaC/Ni复合材料的抗氧化性能

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials

Pub Date : 2026-04-01 Epub Date: 2025-11-27 DOI: 10.1016/j.ijrmhm.2025.107570

Yuanyang Zhu , Qian Qi , Lujie Wang , Yueyang Zhao , Xiquan Zhang , Xiaoqi Yang

It is urgent to improve the oxidation resistance of TaC/Ni composites to furtherly extend their application in tribology and high-temperature areas. In this work, the oxidation resistance of in-situ TaC/Ni composites is significantly improved by adding Cr. As the Cr content increases from 0 wt% to 15 wt%, Ni-Cr matrix and (Ta,Cr)C are formed. The mass gain of composites decreases from 24.1983 mg∙cm⁻² to 8.7198 mg∙cm⁻², and the thickness of oxide scale reduces from 327 μm to 38 μm. The oxidation kinetics changes from linear law to parabolic law. TaC and Cr preferentially react with O to generate TaO₂, CrTaO₄ and Cr₂O₃. CrTaO₄ locates around TaO₂ particles to prevent they furtherly to be oxidized into Ta₂O₅. The Cr₂O₃ and CrTaO₄ form interconnected network in Ni matrix to protect the Ni from oxidation. The oxide scale on composite with 0 wt% Cr is mainly composed of Ta₂O₅, NiTa₂O₆ and NiO, while the oxide scale on composites with 15 wt% Cr is consisted of TaO₂, CrTaO₄ and Cr₂O₃. The Pilling Bedworth ratios of Ta₂O₅ and NiTa₂O₆ are close to 2, while Pilling Bedworth ratios of TaO₂ is 1.22, leading to the disappearance of cracks and pores in oxide scale on composites with Cr. The dense oxide scale rich in CrTaO₄ and Cr₂O₃ could effectively inhibits the outward diffusion of Ta ions and inward diffusion of O ions, resulted in the improve oxidation resistance of composite.

提高TaC/Ni复合材料的抗氧化性能，进一步扩大其在摩擦学和高温领域的应用是当务之急。在本研究中，添加Cr显著提高了原位TaC/Ni复合材料的抗氧化性。随着Cr含量从0 wt%增加到15 wt%， Ni-Cr基体和（Ta,Cr）C形成。复合材料的质量增益由24.1983 mg∙cm−2减小到8.7198 mg∙cm−2，氧化膜厚度由327 μm减小到38 μm。氧化动力学由线性规律转变为抛物线规律。TaC和Cr优先与O反应生成TaO2、CrTaO4和Cr2O3。CrTaO4位于TaO2颗粒周围，防止它们进一步氧化成Ta2O5。Cr2O3和CrTaO4在Ni基体中形成互联网络，保护Ni不被氧化。Cr含量为0 wt%的复合材料的氧化垢主要由Ta2O5、NiTa2O6和NiO组成，而Cr含量为15 wt%的复合材料的氧化垢主要由TaO2、CrTaO4和Cr2O3组成。Ta2O5和NiTa2O6的起球Bedworth比接近于2，TaO2的起球Bedworth比为1.22，导致含Cr复合材料氧化膜中的裂纹和孔隙消失。富含CrTaO4和Cr2O3的致密氧化膜可以有效抑制Ta离子的向外扩散和O离子的向内扩散，从而提高复合材料的抗氧化性。

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引用次数: 0

Temperature effects on the impact wear performance of polycrystalline diamond compacts: Dynamic response analysis and damage mechanism 温度对聚晶金刚石压片冲击磨损性能的影响：动态响应分析及损伤机理

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials

Pub Date : 2026-04-01 Epub Date: 2025-11-28 DOI: 10.1016/j.ijrmhm.2025.107574

Yuzhu Guo , Dezhong Meng , Wen Yue

Polycrystalline diamond compact (PDC) cutters undergo severe damage during deep drilling due to the combined effects of high temperature, impact, and wear. This study investigates the dynamic response and damage behavior of PDC cutters under impact wear at elevated temperatures using a kinetic-energy-controlled impact wear tester equipped with in-situ heating capability. The results demonstrate a significant temperature dependence of the dynamic response. Specifically, the impact force exhibits a distinct V-shaped trend with increasing temperature, reaching a minimum value of 269 N at 200 °C. Furthermore, the energy absorption rate shows a positive correlation with temperature, reaching a peak of 93.07 % at 350 °C. As the temperature rises, the damage behavior transitions from brittle fracture to a combination of brittle fracture, adhesive wear, abrasive wear, and oxidative wear, driven by the thermal stress mismatch between the cobalt (Co) binder and the diamond grains. At elevated temperatures, oxidation of the adherend enhances the impact resistance of the PDC; however, this adhesion phenomenon negatively affects the self-sharpening capability of the diamond, thereby reducing cutting efficiency. These findings provide critical insights for optimizing the performance of PDC cutters in deep drilling applications.

由于高温、冲击和磨损的综合作用，PDC切削齿在深钻过程中会受到严重的破坏。利用具有原位加热功能的动能控制冲击磨损试验机，研究了PDC切削齿在高温冲击磨损下的动态响应和损伤行为。结果表明，动态响应具有显著的温度依赖性。其中，冲击力随温度的升高呈明显的v型变化趋势，在200℃时达到最小值269 N。能量吸收率与温度呈正相关，在350℃时达到93.07%的峰值。随着温度的升高，由于钴（Co）粘结剂与金刚石晶粒之间的热应力不匹配，损伤行为从脆性断裂转变为脆性断裂、粘接磨损、磨粒磨损和氧化磨损的组合。在高温下，粘结剂的氧化增强了PDC的抗冲击性；然而，这种粘附现象对金刚石的自锐能力产生了负面影响，从而降低了切割效率。这些发现为优化PDC切削齿在深钻应用中的性能提供了重要见解。

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引用次数: 0

Comparative study on laser-cladded WC- and TiC- reinforced composite coatings on TBM disc cutters: Process optimization, microstructure evolution, and wear resistance TBM圆盘刀具激光熔覆WC和TiC增强复合涂层的对比研究：工艺优化、显微组织演变和耐磨性

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials

Pub Date : 2026-04-01 Epub Date: 2025-12-10 DOI: 10.1016/j.ijrmhm.2025.107602

Yanhua Bian , Shaoxia Li , Chongxin Tian , Binxin Dong , Hao Liu , Xiuli He , Gang Yu

The rolling cutters of tunnel boring machines (TBMs) suffer from severe wear under extreme geological conditions, which limits their service life and tunneling efficiency. To address this, WC-Ni60 and TiC-Fe-based composite coatings are fabricated on H13 steel substrates via laser cladding. Herein, process parameters are optimized to regulate ceramic particle distribution and suppress cracking. The microstructure, phase composition, and wear resistance of the coatings are systematically investigated. Results indicate that the WC-Ni60 coating is prone to cracking due to thermal stress, whereas the TiC-Fe-based coating achieves a uniform, crack-free microstructure. Consequently, the TiC-Fe-based coating exhibits superior wear resistance, which is attributed to a synergistic reinforcement mechanism involving undissolved TiC particles, in-situ synthesized submicron TiC, and precipitated carbides (e.g., Cr₇C₃, Cr₂₃C₆). In contrast, the WC-Ni60 coating experiences severe bulk spalling during wear tests, initiated by pre-existing cladding cracks. This study provides critical insights into material selection and process optimization for fabricating high-performance wear-resistant coatings on TBM cutters.

隧道掘进机的滚刀在极端地质条件下磨损严重，限制了滚刀的使用寿命和掘进效率。为了解决这一问题，采用激光熔覆的方法在H13钢基体上制备了WC-Ni60和tic - fe基复合涂层。优化工艺参数，调节陶瓷颗粒分布，抑制裂纹。系统地研究了涂层的显微组织、相组成和耐磨性。结果表明，WC-Ni60涂层容易因热应力而开裂，而tic - fe涂层具有均匀、无裂纹的显微组织。因此，TiC- fe基涂层表现出优异的耐磨性，这是由于未溶解TiC颗粒、原位合成亚微米TiC和沉淀碳化物（例如Cr₇C₃，Cr₂₃C₆）的协同增强机制。相比之下，WC-Ni60涂层在磨损测试中会出现严重的大块剥落，这是由预先存在的包层裂纹引起的。该研究为在TBM刀具上制造高性能耐磨涂层的材料选择和工艺优化提供了重要见解。

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引用次数: 0