SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Qibao Yang,Shaobai Sang,Fuyun Yang,Yawei Li,Tianbin Zhu,Heng Wang
RO-R 2 O-Al 2 O 3 -SiO 2 enamel coatings with varying Al 2 O 3 and MgO contents were prepared for the oxidation protection of 06Ni9DR alloy steels at 1100–1200 °C. The oxidation protection ratios of these coatings were investigated under different oxidation temperatures and time, and the degradation mechanism as well as the improvements in oxidation protection were explored. The results revealed that the oxidation protection ratio of traditional enamel coating with low crystalline phase content significantly decreased with oxidation test temperatures and time. The viscosity of the liquid phase in coating reduced with temperatures, facilitating oxygen diffusion. Additionally, the interaction between the coating and the oxidation products of alloy steel further reduced the liquid phase viscosity, decreasing coating thickness and shortening oxygen diffusion paths. However, the oxidation protection of coating with higher Al 2 O 3 and MgO content were enhanced. These coatings exhibited higher crystalline phases content, which effectively increased the apparent viscosity of enamel coating and prolonged oxygen diffusion paths. The thermal stability of coating with high crystalline phases content also were improved. Among these coatings, the coating with 27.47 wt% Al 2 O 3 and 9.93 wt% MgO achieved superior oxidation protection, up to 92.1 %, 76.6 %, and 73.4 % at 1100 °C, 1150 °C, and 1200 °C for 180 min, respectively.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
THIN-WALLED STRUCTURES
·
2022
·
IF 5.881
Danna Tang,Kai Yang,Tianyu Gao,Tingting Liu,Haibin Tang
Mechanical-electromagnetic integrated design has great potential in the development of electromagnetic shielding equipment for military use. In this study, Al 2 O 3 /SiO 2 ceramics with triply periodic minimal surfaces (TPMSs) were fabricated using digital light processing (DLP) technology. The preparation of SiO 2 and Al 2 O 3 powders is vital for DLP because minimal aggregates or sedimentation in the ceramic paste is required. Debinding and sintering programs were developed to prevent defects in the designed microstructure. The interfacial characterization demonstrated that the surfaces of the sintered ceramics were compact and smooth. The compression strength of the TPMS ceramic with a volume fraction of 50% was 24 MPa, which is relatively good among additively manufactured cellular ceramics. The TPMS structures also exhibited significant electromagnetic interference (EMI) shielding effectiveness in the X-band (2 to 18 GHz), and the shielding performance was adequate to meet the demands of electromagnetic shielding materials . Additive manufacturing of Al 2 O 3 /SiO 2 ceramic with TPMS architectures was successfully achieved by considering the mechanical-electromagnetic integration.
研究领域:
材料科学
·
电磁学
·
增材制造
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zijun Peng,Lei Yuan,Xudong Luo,Jingkun Yu,Chen Tian,Zhenli Liu
MgO–Al 2 O 3 –SiO 2 composite ceramics were prepared by spark plasma sintering (SPS). In addition, phase composition, microstructure, mechanical properties , and thermal shock properties have been systematically characterized. Introduction of Al 2 O 3 and SiO 2 significantly increased mechanical properties and thermal shock resistance of these composite ceramics. MgO–Al 2 O 3 –SiO 2 composite ceramics prepared by spark plasma sintering (SPS) exhibited fine grain size. Reduced grain size may result in extraordinary properties. Experimental results showed that MgO–Al 2 O 3 –SiO 2 composite ceramics had the highest flexural strength and hardness among all studied ceramics of 269.6 ± 9.22 MPa and 12.51 ± 0.29 GPa, respectively. Moreover, MgO–Al 2 O 3 –SiO 2 composites can reach 16 thermal cycle times. This shows that it is feasible to prepare high-performance MgO composite ceramics by SPS. Furthermore, introduction of Al 2 O 3 and SiO 2 is effective method to improve mechanical properties and thermal shock resistance of MgO composite ceramics.
研究领域:
材料科学
·
陶瓷工程
·
先进制造
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Le Fu,Zihua Lei,Wenjun Yu,Mingxi Deng
The limited flexibility in terms of chemical composition restricts the microstructure and property regulation possibilities of ZrO 2 -Al 2 O 3 binary ceramic composites (BCCs). Therefore, it is significant to prepare ternary ceramic composites by introducing a third phase. In this study, a fixed proportion of amorphous SiO 2 (30 mol%) was incorporated as the third phase to develop ZrO 2 -Al 2 O 3 -SiO 2 ternary ceramic nanocomposites (TCNCs) with two distinct Zr/Al ratios. The TCNCs were fabricated using containerless aerodynamic levitation technology, which featured a large thermal gradient that would facilitate the formation of nano-eutectics. In samples with a Zr/Al ratio of 3:1, monoclinic ZrO 2 was the sole crystalline phase. The Al element was present in either Al-O-Si or Al-O glass phase, depending on the processing temperature; In contrast, ZrO 2 -Al 2 O 3 nano-eutectics were formed in samples with a Zr/Al ratio of 3:8, accompanied by the generation of mullite crystallites. The SiO 2 phase functioned as an amorphous matrix. Vickers hardness of the TCNC with a Zr/Al ratio of 3:8 exhibited comparability to that reported for ZrO 2 -Al 2 O 3 composites.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
JOM
·
2023
·Vol. 75
·期 12
·5167-5175
·
IF 2.6
Li Guanghui,Huang Jiahao,Sun Hu,Mang Changye,Hou Yanrui,Luo Jun
The novel one-step oxidation–volatilization process for separating MoO 3 from pelletized MoS 2 concentrate supported on a porous Al 2 O 3 -SiO 2 skeleton has been demonstrated to have superior diffusion efficiency compared to the traditional two-step oxidative roasting-sublimation approach. Optimal control of pellet phase and micro-structure evolutions is crucial for maintaining a stable and breathable pellet bed throughout the roasting process, which is essential for industrial application of the new process. This work determined the phase transformations of MoS 2 concentrate pellets during roasting, revealed the formation mechanisms of mullite whiskers from MoS 2 -Al 2 O 3 -SiO 2 system and thus achieved toughening control of roasted MoS 2 concentrate pellets with temperature programmed roasting (TPR). It is found that the intermediate product Al 2 (MoO 4 ) 3 can induce the low-temperature formation of mullite whisker. With TPR, the volatilization rate of molybdenum is 97.2%, and the compressive strength of mullite pellets reach 124.8 N. This study puts forward a feasible route with industrial significance.
研究领域:
材料科学
·
冶金工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2018
·
IF 2.488
Huijun Yu,Yiting Jiang,Yufa Lu,Xiaolei Li,Hangyuan Zhao,Yuecheng Ji,Mingjing Wang
A low-cost and high-performance quartz fiber/Al 2 O 3 -SiO 2 aerogel (QF/ASA) composite insulation material has been successfully prepared by vacuum filtration molding and sol-gel impregnation following surface-modified ambient pressure drying (APD). The macroporous in the quartz fiber perform are filled by Al 2 O 3 -SiO 2 aerogels with a large amount of mesoporous. The morphology, microstructure, thermal conductivity and thermal stability of the QF/ASA composite were investigated. Compared to the fiber/aerogel materials dried by supercritical drying, the composite exhibits similar low density (0.36 g·cm −3 ), high specific surface area (580.5 m 2 ·g −1 ), low thermal conductivity (0.049 W·m −1 ·K −1 ) at room temperature. The compressive strength of the composite up to 0.85 MPa which is approximately triple as much as that of fiber perform. After being heated at 600 to 1100 °C, the specific surface area of composite aerogel decrease from 578.0 to 113.6 m 2 ·g −1 and the linear shrinkage is almost zero. The XRD patterns show that mullite (3Al 2 O 3 ·2SiO 2 ) appeared in the Al 2 O 3 -SiO 2 aerogel after heat-treatment at 1100 °C, which is consistent with the molar ratio of silica and alumina of 2:3.
研究领域:
材料科学
·
化学工程
·
热绝缘
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
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 CaF 2 /CaO content on sintering behavior, microstructure and properties of Li 2 O–Al 2 O 3 –SiO 2 (LAS) glass-ceramics. It was found that the [CaF 2 ]/([CaO]+[CaF 2 ]) 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.
研究领域:
材料科学
·
陶瓷工程
·
电气工程
✓ 已验证
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2023
·Vol. 109
·期 2
·523-533
·
IF 2.5
Hao Mingyuan,Chen Huanle,Xia Chenkang,Su Teng,Ma Chao,Miao Yang
Aluminum silicate nanofibers (ASNFs) have attracted significant attention due to their excellent stability and high-temperature properties. Al 2 O 3 -SiO 2 aerogel (ASAs) has high porosity and low thermal conductivity, but its mechanical properties need to be improved. Reinforcing aerogels with fibers can lead to remarkable enhancements in their properties. Reducing the fiber diameter has proven to be an effective means of improving the structural integrity and mechanical stability of aerogel composites. In the context of this study, we prepared aluminum silicate nanofibers (ASNFs) with a diameter of 170 nm through the utilization of electrostatic spinning. These ASNFs were then successfully integrated with aluminum silicate aerogels (ASAs) to create a novel composite material known as aluminum silicate nanofiber-reinforced Al 2 O 3 -SiO 2 aerogel (AS/ASNFAs). Its microstructure, mechanical properties and heat insulation properties have been researched. The results show that the compressive strength of AS/ASNFAs (0.44 MPa) is significantly higher than that of Al 2 O 3 -SiO 2 aerogel (0.16 MPa). Meanwhile, the AS/ASNFAs has high specific surface area (600 m 2 /g), low density (0.15 g/cm 3 ), and low thermal conductivity (0.026 W/(m·K)). This work provides a useful solution to improve the comprehensive properties of Al 2 O 3 –SiO 2 aerogel composites. Graphical
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2026
·
IF 3.3
Xiao Yang,Zhou Huarui,Wei Junyu,Tang Zhaoyi,Qian Kun,Wang Ning,Zhao Baojun,Liao Jinfa
With the increasing use of high-alumina iron ores in blast furnace ironmaking, the Al 2 O 3 content in the slags has gradually risen to 15 to 20 wt pct, significantly affecting the phase equilibria and flow properties of the slag system. In this study, the phase equilibria in the CaO–MgO–Al 2 O 3 –SiO 2 quaternary system with a fixed Al 2 O 3 /SiO 2 mass ratio of 0.5 (representative of typical high-Al 2 O 3 blast furnace slags) were systematically investigated using high-temperature equilibration and quenching experiments combined with electron probe microanalysis (EPMA). A pseudo-ternary phase diagram CaO–MgO–(SiO 2 +Al 2 O 3 ) was constructed. At a fixed (SiO 2 +Al 2 O 3 ) content of 55 wt pct, the minimum liquidus temperatures for slags with Al 2 O 3 /SiO 2 = 0.5 occur at MgO/CaO ≈ 0.4 (1360 °C), respectively, and the liquidus temperature of the Al 2 O 3 /SiO 2 = 0.4 slag is consistently lower than that of the Al 2 O 3 /SiO 2 = 0.5 slag over the entire MgO/CaO range studied. At fixed MgO/CaO weight ratio of 0.2 and 0.15, the liquidus temperature first decreases and then increases with increasing quaternary basicity (defined as (CaO+MgO)/(SiO 2 +Al 2 O 3 ) by mass). In the conventional basicity range of blast furnace slag (0.95 to 1.05), the liquidus temperature ranges from 1400 °C to 1500 °C, and the high-alumina slag always exhibits a higher liquidus temperature than the ordinary slag. Significant deviations exceeding 50 °C were observed between the experimental liquidus temperatures and the phase equilibria calculated using the FactSage 8.4 thermodynamic database for high‑alumina blast furnace slags. The compositional characteristics of the melilite solid solution were also analyzed using EPMA‑derived compositional data. Strong linear correlations among Al 2 O 3 , SiO 2 , and MgO in melilite confirm the isomorphous substitution mechanism. When the Al 2 O 3 /SiO 2 ratio in the liquid phase is below 0.5, the Al 2 O 3 /SiO 2 ratio in melilite increases sharply with increasing liquid ratio; when the liquid ratio exceeds 0.5, the Al 2 O 3 /SiO 2 ratio in melilite stabilizes within a narrow range of 1.4 to 1.6, indicating that the incorporation of Al 3 ⁺ in the melilite structure approaches an apparent solubility limit.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Yuxiang Shen,Huan Liu,Raz Muhammad,Yang Yao,Xueqing Yu,Alexander Korotkevich,Minmin Mao,Lei Cao,Bing Liu,Haishen Ren,Huixing Lin,Matjaz Spreitzer,Mikhail P. Kuz'min,Ruzhong Zuo,Kaixin Song
In this study, 21.9 mol% MgO - 20.3 mol% Al 2 O 3 - 54.6 mol% SiO 2 + 1.6 mol% MnO 2 + 1.6 mol% ZnO and 23.1 mol% MgO - 20.9 mol% Al 2 O 3 - 55.0 mol% SiO 2 + 1.0 mol%GeO 2 were prepared by low-temperature co-firing method. The effects of nucleating agents and sintering temperature on the crystallization behavior, microstructure and microwave dielectric properties of MASMZ and MASG glass-ceramics were investigated. It was found that both glass-ceramics were able to precipitate stable α-cordierite crystalline phases at relatively low temperatures. Crystallization kinetics analysis showed that MASMZ glass-ceramics crystallized more easily than MASG glass-ceramics. MASMZ glass-ceramics exhibited optimal dielectric properties at 925 °C: ε r = 4.74, tan δ = 8.1 × 10 −4 , τ f = -14 ppm/°C. MASG glass ceramics achieved optimal dielectric properties at 950 °C: ε r = 4.46, tan δ = 1.11 × 10 −3 , τ f = -27 ppm/°C. Especially, the excellent chemical stability and compatibility of MASMZ and MASG glass-ceramics with silver at high temperatures were verified, indicating the potential of MASMZ and MASG glass ceramics as LTCC substrate materials.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2021
·Vol. 36
·期 2
·174-182
·
IF 0.957
Shi Minxian,Tang Qingxiu,Fan Shanshan,Dong Chuang,Huang Zhixiong
The ceramifiable polymer composite of MgO-Al 2 O 3 -SiO 2 /boron phenolic resin(MAS/BPF) with 40wt% of inorganic fillers was calcined at 1 200 °C for different time to promote ceramification of ceramifiable composite and improve heat resistance. The effects of different calcine time on the macroscopical morphology, mass loss, phase evolution, microstructure and chemical bond evolution of MAS/BPF composites were characterized by XRD, XPS, and SEM analyses. The experimental results reveal that the increase of calcine time result in the fewer holes, relatively denser and smoother top layer of MAS/BPF composites and protect the interior from deeper decomposition. The final residues of composites are amorphous carbon and C-O-Si-Al-Mg ceramic. And MAS/BPF composites show excellent mass stability, low shrinkage and self-supporting features after 2 h holding compared with BPF composites without 40wt% of inorganic fillers.
研究领域:
材料科学
·
无机化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·Vol. 43
·期 16
·13810-13816
·
IF 2.986
Qingong Zhu,Huanping Wang,Ying Tian,Ren Gao,Shilong Zhao,Lihui Huang,Shiqing Xu,Xianghua Zhang
Glass system with compositions of 93.9% ( x CaO- y Al 2 O 3 - z SiO 2 )−5% MgO-1% B 2 O 3 −0.1% Fe 2 O 3 has been prepared by a conventional melt-quenching technique, and the glass forming region and the mechanical properties of the derived glasses were investigated. The approximate glass forming region was found to be x = 10～35%, y = 10～35% and z = 50～80%, while the rest of the area was crystallization zone or crack zone. As x = 10%, y = 25% and z = 65% (Sample 13), the investigated glass possesses the optimum volume density, bending strength , compression strength and modulus, which are 2.572 g/cm 3 , 74.05 MPa, 312.84 MPa and 163.96 GPa, respectively. Compared to sample 13, samples with different compositions have reduced the volume density, lowered the Raman intensity and improved the optical band gap. For the mechanical properties, with decreasing the contents of SiO 2 , the bending strength firstly increases, then decreases and finally shows a relatively small increasing trend. The dependence of compression strength and compression modulus on SiO 2 content shows a similar trend to the bending strength. Moreover, the optical band gap and Raman spectrum of the sample 13 indicate that the number of oxygen bonds in the bridge reach the maximum, which could further confirm a significantly improvement on the mechanical properties.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）