Materials Chemistry and Physics最新文献_第5页

Superhydrophobic electrodeposited nano-sio2/N-doped carbon dots coating for Mg alloys 用于镁合金的超疏水电沉积纳米 sio2/N 掺杂碳点涂层

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2024-11-17 DOI: 10.1016/j.matchemphys.2024.130164

Xutong Duan , Yongfei Wang , Ruijie Guo , Baolong Niu , Huifang Wang , Hong Yan

To solve the problems of poor corrosion resistance, low adhesion and poor abrasion resistance of general superhydrophobic coatings, A superhydrophobic nano-SiO₂/N-doped carbon dots (N-CDs) was prepared on the surface of AZ31B magnesium alloy. The electrolyte consisted of nano-silica particles and N-CDs dispersion, where nano-SiO₂ particles were innovatively added to improve the abrasion resistance of the coating. After the superhydrophobic modification by 1H,1H,2H,2H-perfluorooctyltriethoxysilane (PTES), the coating exhibited a water contact angle (WCA) of 154° and a rolling angle (RA) of 7°. The analysis undertaken via potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) demonstrated improved electrochemical performance for the coated magnesium alloy samples when compared with uncoated counterparts. The assemblies formed by the coordination of Mg²⁺ with the functional groups of N-CD (−NH₂, –COOH and –OH) were electrodeposited onto the surface of the magnesium alloy matrix, achieving a dense protective film and thereby slowing down the corrosion rate. At the same time, the abrasion resistance test results indicated that the prepared coating possessed excellent abrasion resistance, possessing the ability to resist damage to the coating caused by friction to a certain extent, proposing a new idea for fabricating superhydrophobic coatings with increased abrasion resistance on Mg alloys.

为了解决一般超疏水涂层耐腐蚀性差、附着力低和耐磨性差的问题，在 AZ31B 镁合金表面制备了一种超疏水纳米二氧化硅/N 掺杂碳点（N-CDs）涂层。电解液由纳米二氧化硅颗粒和 N-CDs 分散液组成，其中创新性地添加了纳米二氧化硅颗粒，以提高涂层的耐磨性。经 1H,1H,2H,2H-全氟辛基三乙氧基硅烷（PTES）进行超疏水改性后，涂层的水接触角（WCA）为 154°，滚动角（RA）为 7°。通过电位极化和电化学阻抗光谱（EIS）进行的分析表明，与未涂层的镁合金样品相比，涂层镁合金样品的电化学性能有所提高。Mg2+ 与 N-CD（-NH2、-COOH 和 -OH）官能团配位形成的集合体被电沉积到镁合金基体表面，形成一层致密的保护膜，从而减缓了腐蚀速度。同时，耐磨性测试结果表明，制备的涂层具有优异的耐磨性，能够在一定程度上抵御摩擦对涂层造成的破坏，为在镁合金上制备耐磨性更强的超疏水涂层提出了新的思路。

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引用次数: 0

Study of micro-expansion deformation of cement-based materials enhanced by soybean-wax-coated carbide slag composites 大豆蜡涂层电石渣复合材料增强水泥基材料微膨胀变形的研究

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2024-11-17 DOI: 10.1016/j.matchemphys.2024.130165

Huiyuan Ning , Changwang Yan , Ju Zhang , Junqing Li , Weifeng Nie , Zhongtao Lv , Qvjiang Wu , Xiangdong Meng , Fengwei Zhao

The industrial solid waste carbide slag (CS) is composed mainly of calcium hydroxide (Ca(OH)₂), which produces calcium oxide (CaO) after calcination and can be used as a CaO-type expansion agent. However, the hydration reaction of calcined CS often occurs before the cement setting and hardening time, and the resulting expansion is ineffective, which limits the wide application of CS as a CaO expansion agent. In this study, a new type of swelling agent, soybean-wax-coated CS composite (CSCC), was prepared by using soybean wax (SW) to coat the calcined CS to delay its hydration. In this study, the microstructural composition of CSCC was investigated, and the hydration history and retardation characteristics and effects of CSCC with various mixing ratios were analysed. The micro-expansion deformation and strength development of CSCC cement-based materials were also investigated, and a micro-expansion model was established. The results showed that SW wrapped around the surface of CS particles formed a dense wrapping structure and effectively delayed hydration. Meanwhile, compared with CS, CSCC had an induction period in the hydration process due to the coating of SW, which greatly delayed the hydration of CS. Also, the optimum mixing ratio of CSCC was determined by analysing the delayed hydration onset time and the time of the second exothermic rate peak. It was also found that incorporating CSCC resulted in a significant increase in the micro-expansion deformation of the cementitious materials but a decrease in the compressive strength.

工业固体废弃物电石渣（CS）的主要成分是氢氧化钙（Ca(OH)2），煅烧后生成氧化钙（CaO），可用作 CaO 型膨胀剂。然而，煅烧 CS 的水化反应往往发生在水泥凝结硬化时间之前，所产生的膨胀效果不佳，这限制了 CS 作为 CaO 膨胀剂的广泛应用。本研究利用大豆蜡（SW）包覆煅烧 CS 以延缓其水化反应，制备了一种新型膨胀剂--大豆蜡包覆 CS 复合材料（CSCC）。本研究对 CSCC 的微观结构组成进行了研究，并分析了不同混合比的 CSCC 的水化历程和延缓特性及效果。还研究了 CSCC 水泥基材料的微膨胀变形和强度发展，并建立了微膨胀模型。结果表明，包裹在 CS 颗粒表面的 SW 形成了致密的包裹结构，有效地延缓了水化。同时，与 CS 相比，由于 SW 的包裹，CSCC 在水化过程中存在一个诱导期，大大延迟了 CS 的水化。此外，通过分析延迟水化开始时间和第二个放热速率峰的时间，确定了 CSCC 的最佳混合比。研究还发现，掺入 CSCC 会显著增加胶凝材料的微膨胀变形，但会降低抗压强度。

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引用次数: 0

Unusual dielectric properties of NaCl solutions within confined MoS2 monolayer nanochannels 受限 MoS2 单层纳米通道内 NaCl 溶液的异常介电特性

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2024-11-16 DOI: 10.1016/j.matchemphys.2024.130161

Xinwu Li , Zihan Xu , Xinyu Zeng , Wenzhi He , Guangming Li , Yanhui Wu , Haochen Zhu

The dielectric behavior of NaCl solutions at varying concentrations within different types of MoS₂ nanochannels has been systematically investigated through molecular dynamics simulations. This comprehensive set of simulations aims to provide profound insights into the interplay among spatial dimensions, structural configurations, and electrolyte solution concentration on dielectric properties. The findings presented in this paper reveal that the dielectric constant of both aqueous and NaCl solutions in confined phases exhibits anisotropic behavior within MoS₂ confinement systems. Notably, as the concentration of NaCl solution increases, the axial dielectric constant in these confined environments decreases, while the radial dielectric constant experiences an increase, demonstrating a non-monotonic trend with critical points observed at 0.4 mol/L and 0.6 mol/L for NaCl solutions. This anomalous dielectric behavior can be attributed to the reorientation of water molecules at lower concentrations aimed at preserving the original hydrogen bonding network within the confined system, which leads to enhanced dipole fluctuations and an unusual increase in radial dielectric constants.

我们通过分子动力学模拟系统地研究了不同浓度的氯化钠溶液在不同类型的 MoS2 纳米通道中的介电行为。这组全面的模拟旨在深刻揭示空间尺寸、结构配置和电解质溶液浓度对介电性能的影响。本文的研究结果表明，在 MoS2 封闭系统中，水溶液和氯化钠溶液在封闭相中的介电常数表现出各向异性。值得注意的是，随着 NaCl 溶液浓度的增加，这些封闭环境中的轴向介电常数会降低，而径向介电常数则会增加，呈现出非单调趋势，NaCl 溶液的临界点分别为 0.4 摩尔/升和 0.6 摩尔/升。这种反常的介电行为可归因于水分子在较低浓度下的重新定向，其目的是在封闭系统中保留原有的氢键网络，这导致偶极子波动增强，径向介电常数异常增加。

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引用次数: 0

Annealing-induced phase transformation in vapor deposited tellurium dioxide thin films and its structural, chemical analysis 退火诱导的气相沉积二氧化碲薄膜相变及其结构和化学分析

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2024-11-16 DOI: 10.1016/j.matchemphys.2024.130160

K. Chandra, M.G. Mahesha, Pramoda Kumara Shetty

Tellurium dioxide (TeO₂) thin films were synthesized by thermal vacuum deposition on glass substrate and samples were annealed from 250 °C to 400 °C at 50 °C interval. The annealing was found to have a significant impact on the structural, optical, and electrical properties of TeO₂ thin films. X-ray diffraction spectra (XRD) revealed an increase in crystallite size and corresponding decrease in micro strain and dislocation density with increasing temperature. Annealed sample at 350 °C and 400 °C showed phase change from γ-TeO₂ to β-TeO₂ since β phase is thermodynamically favourable with greater free energy change. X-ray Photoelectron spectroscopy of all annealed sample confirm the improvement in formation of TeO₂ from metallic Tellurium with air annealing. The XPS analysis also confirmed the existence of interstitial Oxygen, and its concentration increased at 400 °C. Raman spectroscopy employed to investigate the variation in vibrational modes with temperature and correlate these findings with other structural and chemical analyses. Photoluminescence study of TeO₂ thin films reveals evolution of defect states with annealing temperature. Decrease in intensity of defect-related emissions (green, near-IR) suggests improved crystallinity which was in turn supported by the disappearance of low-level defect peaks upon annealing.

通过热真空沉积法在玻璃基底上合成了二氧化碲（TeO2）薄膜，并以 50 °C 的间隔将样品从 250 °C 退火至 400 °C。研究发现，退火对 TeO2 薄膜的结构、光学和电学特性有显著影响。X 射线衍射光谱（XRD）显示，随着温度的升高，晶体尺寸增大，微应变和位错密度相应减小。在 350 ℃ 和 400 ℃ 下退火的样品出现了从γ-TeO2 到 β-TeO2 的相变，因为 β 相在热力学上是有利的，自由能变化较大。对所有退火样品进行的 X 射线光电子能谱分析证实，通过空气退火，金属碲形成 TeO2 的情况有所改善。XPS 分析还证实了间隙氧的存在，且其浓度在 400 °C 时有所增加。拉曼光谱用于研究振动模式随温度的变化，并将这些发现与其他结构和化学分析联系起来。TeO2 薄膜的光致发光研究揭示了缺陷态随退火温度的变化。缺陷相关发射（绿色、近红外）强度的降低表明结晶度有所提高，而退火后低级缺陷峰的消失又反过来证明了这一点。

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引用次数: 0

Mechanical and biocorrosion properties of Ti-XZrC composites fabricated by spark plasma sintering 火花等离子烧结法制造的 Ti-XZrC 复合材料的力学和生物腐蚀性能

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2024-11-16 DOI: 10.1016/j.matchemphys.2024.130153

Nima Hejazi, Mojtaba Najafizadeh, Mansoor Bozorg, Maryam Shojaie-bahaabad

The Ti-XZrC (X = 5, 10, 15 wt%) composites were fabricated by spark plasma sintering. The composites microstructure, mechanical, and biocorrosion properties were studied and compared with the CP Ti fabricated by the same condition. The results show that with the increasing amount of the ZrC in the matrix, the bulk composites relative is density reduced and the hardness and strength of the composites are significantly increased for fabricating the TiC intermetallics in microstructure. The Ti–5ZrC composite has significantly higher biocorrosion resistance than the CP Ti, and the polarization resistance of the composites is reduced by increasing the ZrC content from 5 to 15, because of the increasing porosities and diffusion rate of corrosive ions through the oxide layers. Generally, the Ti-XZrC composites show significantly excellent mechanical properties with increasing ZrC than the CP Ti, and the biocorrosion resistivity of the Ti–5ZrC composite as compared to the CP Ti is higher, suggesting that the Ti–5ZrC composite is favorable material for the biomedical application as compared with the CP Ti and the other composition of the Ti-XZrC composites. The Ti–5ZrC composite exhibited a hardness of 326 Hv and an ultimate tensile strength of 0.901 GPa, demonstrating significant improvements over commercially pure titanium. Additionally, this composite showed a polarization resistance of 720 kΩ cm² and a low corrosion current density of 4.60 μA/cm², indicating superior biocorrosion resistance.

采用火花等离子烧结法制造了 Ti-XZrC （X = 5、10、15 wt%）复合材料。研究了复合材料的微观结构、机械性能和生物腐蚀性能，并与相同条件下制造的 CP Ti 进行了比较。结果表明，随着基体中 ZrC 含量的增加，体积复合材料的相对密度降低，复合材料的硬度和强度显著增加，从而在微观结构中制造出 TiC 金属间化合物。Ti-5ZrC 复合材料的耐生物腐蚀性能明显高于 CP Ti，而当 ZrC 含量从 5 增加到 15 时，复合材料的耐极化性能会降低，这是因为孔隙率和腐蚀离子通过氧化层的扩散速度会增加。总体而言，随着 ZrC 含量的增加，Ti-XZrC 复合材料的力学性能明显优于 CP Ti，而且与 CP Ti 相比，Ti-5ZrC 复合材料的抗生物腐蚀性更高，这表明与 CP Ti 和其他成分的 Ti-XZrC 复合材料相比，Ti-5ZrC 复合材料是一种有利于生物医学应用的材料。Ti-5ZrC 复合材料的硬度为 326 Hv，极限拉伸强度为 0.901 GPa，与市售纯钛相比有显著提高。此外，这种复合材料的极化电阻为 720 kΩ cm2，腐蚀电流密度低至 4.60 μA/cm2，显示出卓越的耐生物腐蚀性。

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引用次数: 0

Comparative study of pure and chromium-doped nickel oxide nanoparticles synthesized by combustion synthesis for optoelectronic applications

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2024-11-16 DOI: 10.1016/j.matchemphys.2024.130150

M.A. Sayed , Ashwani Kumar , Kamlesh V. Chandekar , Mohd Shkir

In the present research work, the incorporation of Chromium (Cr) doped nickel oxide (NiO) nanoparticles (NPs) were synthesized using the flash combustion process. The impact of Cr-doped NiO (Cr:NiO) NPs on the structural, optical, and dielectric properties was investigated in the research work. X-ray Diffraction (XRD) and FT-Raman (Fourier transform Raman) were also used to determine the phase of Cr: NiO NPs. The crystallite size decrease from 26.2 to 8.5 nm as the doping Cr concentration increased from 0.0 wt.% Cr to 5.0 wt.% Cr. The values of crystallite size and lattice strain were observed to vary with the changing concentrations of Cr: NiO nanoparticles (NPs), respectively. Scanning electron microscopy (FSEM) images revealed that Cr: NiO NPs have spherical shape particles of the prepared NPs. Diffuse reflectance spectroscopy (DRS) was employed to measure the optical band gaps of the prepared NPs using the Kubelka-Munk (K-M) function. The optical energy gaps for Cr:NiO decreased from 3.47 eV to 2.86 eV with an increase in the doping concentration of Cr in NiO. The dielectric properties have been investigated by incorporating Cr into the NiO lattice structure. The highest dielectric constant was observed for 7.5 wt% Cr loaded NiO NPs, which is almost two times that of pure NiO. The reduced crystallite size, enhanced band gap, and dielectric properties indicate the significance of the synthesized NPs in optoelectronic devices.

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引用次数: 0

Innovative Z-scheme MnV₂O₆/g-C₃N₄ nanocomposite: photocatalytic, electrocatalytic and biosensing properties 创新性 Z 型 MnV₂O₆/g-C₃N₄ 纳米复合材料：光催化、电催化和生物传感特性

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2024-11-16 DOI: 10.1016/j.matchemphys.2024.130159

Muhammad Danish Khan , Masood ul Hassan Farooq , Iqra Fareed , Tahmina Maqsood , Faisal Nawaz , Yahya Sandali , Afrah Alzahrani , Muhammad Tahir , Faheem K. Butt

Herein, we report Z-scheme mediated pn-junction between manganese vanadate and graphitic carbon nitride, highlighting its photocatalytic degradation capabilities, hydrogen and oxygen evolution reactions and electrochemical biosensing efficacy towards ascorbic acid. The material was synthesized using a co-precipitation method followed by annealing and characterized through XRD, FESEM, FTIR, XPS, UV–visible spectroscopy and EIS in conjunction with Mott-Schottky analysis. The heterojunction demonstrates promising results for photocatalytic degradation of organic dyes. This work further discusses the carrier concentration, decay rate, cyclic stability and photocatalytic degradation mechanism. The results for HER and OER indicate the synthesized material's capability for oxygen and hydrogen production at commercial scale, with Tafel slope calculations providing additional insights. Electrochemical biosensing of ascorbic acid reveals that the material can detect low concentrations of ascorbic acid under various parameters. The results indicate that the material is highly suitable for environmental degradation, electrocatalytic production of hydrogen and oxygen and medical diagnostics such as electrochemical biosensing.

在此，我们报告了钒酸锰和氮化石墨碳之间 Z 型介导的 pn-接合，突出了其光催化降解能力、氢和氧进化反应以及对抗坏血酸的电化学生物传感功效。该材料采用共沉淀法合成，然后进行退火，并通过 XRD、FESEM、FTIR、XPS、紫外-可见光谱和 EIS 以及 Mott-Schottky 分析对其进行了表征。该异质结在光催化降解有机染料方面取得了可喜的成果。这项工作进一步讨论了载流子浓度、衰减率、循环稳定性和光催化降解机制。HER 和 OER 的结果表明，合成材料具有商业规模制氧和制氢的能力，而 Tafel 斜率计算则提供了更多的见解。抗坏血酸的电化学生物传感显示，该材料可以在各种参数下检测低浓度的抗坏血酸。结果表明，该材料非常适合用于环境降解、氢气和氧气的电催化生产以及电化学生物传感等医疗诊断。

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引用次数: 0

Innovative electrochemical quantification of brilliant blue dye with polyvinylpyrrolidone-stabilized MoS₂

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2024-11-16 DOI: 10.1016/j.matchemphys.2024.130155

Aswathy S. Murali, Beena Saraswathyamma

In this study, the synthesis of a composite material such as molybdenum disulphide/poly vinylpyrrolidone (MoS₂/PVP) using a simple hydrothermal method is showcased. Also discovered its capability for electrochemical detection of a well-known food dye, brilliant blue (BB), which has not been previously reported. The incorporation of PVP into MoS₂ significantly enhanced the electrochemical stability of the composite for the detection of brilliant blue. The comprehensive analysis of the material in its original state provided a thorough understanding of its structural and morphological properties, both prior to and following the incorporation of PVP. The modifications resulting from the action of PVP intercalation were intriguing and sufficiently capable of causing a considerable impact on the electrochemical output of the entire investigation. The significant transformation in morphology, from nanoflowers to a sheet-like structure, in the presence of PVP is remarkable. The MoS₂/PVP coated glassy carbon electrode (MoS₂/PVP/GCE) demonstrated the broadest linear range for BB determination compared to any previously reported results, spanning from 0.8 μM to 1150.0 μM, with a limit of detection (LOD) value of 9.0 nM. The manufactured electrode has significant repeatability and reproducibility. The selectivity analysis highlights the sensor's ability to accurately and specifically detect the target analyte, even in the presence of potential interfering substances. The evaluation of MoS₂/PVP/GCE in several authentic samples demonstrates the sensor's dependability in detecting BB in real-time situations.

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引用次数: 0

Impact of rhenium ion stability on coating quality in chloride molten salts 铼离子稳定性对氯化物熔盐中涂层质量的影响

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2024-11-16 DOI: 10.1016/j.matchemphys.2024.130156

Jiangfan Wang , Weichao Yuan , Li'an Zhu , Zhen Wang , Yicong Ye , Shun Li , Yu Tang , Shuxin Bai

Rhenium (Re) has received considerable attention due to its excellent mechanical properties at high temperatures and resistance to gas corrosion, making it suitable for high-temperature environments as a substrate and coating. Among various preparation methods, electrodeposition offers high efficiency, cost-effectiveness, and substrate shape insensitivity, making it a promising approach for Re coating and component fabrication. Research on chloride molten salt systems is prevalent; however, coating defects often arise from disproportionation reactions, a critical determinant of coating quality. To assess Re ion stability in molten salts and optimise electrodeposition, the effects of atmospheric conditions, molten salt composition, and electrode materials were investigated. Our findings revealed poor Re ion stabilisation in molten salts, susceptible to disproportionation reactions at interfaces forming ReCl₅ and Re. The presence of oxygen in an argon atmosphere promoted the disproportionation reaction, whereas, chlorine inhibited the reaction. The composition of the molten salt affected the Re ion structure; a larger cation radius increased Re ion stability. Similar catalytic behaviour was observed on electrode surfaces, where unstable Re ions disproportionated, weakening interfacial bonding and increasing defects.

铼（Re）在高温下具有优异的机械性能和抗气体腐蚀性能，适合在高温环境中用作基底和涂层，因此受到广泛关注。在各种制备方法中，电沉积具有效率高、成本效益高、对基底形状不敏感等优点，是一种很有前途的 Re 涂层和元件制造方法。有关氯化物熔盐体系的研究十分普遍，但涂层缺陷往往来自歧化反应，而歧化反应是决定涂层质量的关键因素。为了评估 Re 离子在熔盐中的稳定性并优化电沉积，我们研究了大气条件、熔盐成分和电极材料的影响。我们的研究结果表明，Re 离子在熔盐中的稳定性很差，容易在界面上发生歧化反应，形成 ReCl5 和 Re。氩气环境中氧气的存在促进了歧化反应，而氯气则抑制了反应。熔盐的成分会影响 Re 离子的结构；阳离子半径越大，Re 离子的稳定性越高。在电极表面也观察到类似的催化行为，不稳定的 Re 离子在电极表面发生歧化，削弱了界面结合力，增加了缺陷。

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引用次数: 0

Sintering behaviors, microstructure and properties of Li2O–Al2O3–SiO2 glass-ceramics for LTCC applications 用于 LTCC 应用的 Li2O-Al2O3-SiO2 玻璃陶瓷的烧结行为、微观结构和性能

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2024-11-16 DOI: 10.1016/j.matchemphys.2024.130163

Shuo Tian , Hao Yang Shen , Jun Jie Huang , Hao Zhang , Kai Ge Liu , Bin He , Jianwei Zhao , Ling Bing Kong

When preparing glass-ceramics using sintering method, porosity is the main reason affecting their properties. To achieve glass-ceramics with low thermal expansion performance, cold isostatic pressing is adopted to significantly reduce the porosity. In this study, we systematically analyzed the effect of CaF₂/CaO content on sintering behavior, microstructure and properties of Li₂O–Al₂O₃–SiO₂ (LAS) glass-ceramics. It was found that the [CaF₂]/([CaO]+[CaF₂]) ratio x can be used to regulate the coefficient of thermal expansion (CTE) of the LAS glass-ceramics. The optimized sample has a CTE of 2.2865 ppm/°C, which is compatible with that of silicon (2.5 ppm/°C). At the same time, low dielectric constant (5.95 ≤ ε_r ≤ 8.89) and dielectric loss (1.179 × 10⁻³ ≤ tanδ ≤2.871 × 10⁻²) were observed, which makes them a promising candidate for low-temperature co-fired ceramic substrate applications.

使用烧结法制备玻璃陶瓷时，孔隙率是影响其性能的主要原因。为了获得热膨胀性能较低的玻璃陶瓷，采用冷等静压法可以显著降低孔隙率。本研究系统分析了 CaF2/CaO 含量对 Li2O-Al2O3-SiO2 (LAS) 玻璃陶瓷的烧结行为、微观结构和性能的影响。研究发现，[CaF2]/（[CaO]+[CaF2]）比 x 可用来调节 LAS 玻璃陶瓷的热膨胀系数（CTE）。优化样品的热膨胀系数为 2.2865 ppm/°C，与硅的热膨胀系数（2.5 ppm/°C）相当。同时，还观察到了较低的介电常数（5.95 ≤ εr ≤ 8.89）和介电损耗（1.179 × 10-3 ≤ tanδ ≤2.871 × 10-2），这使它们成为低温共烧陶瓷基底应用的理想候选材料。

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引用次数: 0