JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Jianhua Liu,Xiaojun Lv,Jie Li,Yexiang Liu
MgAl 2 O 4 MgAlON materials as potential candidate sidewalls were prepared by using AlN , MgO , Al 2 O 3 , and nanosized MgAl 2 O 4 powder as starting materials. The reaction sintering of the MgAl 2 O 4 MgAlON materials was investigated by means of X-ray diffraction and scanning electron microscope. All the specimens were corroded in a Na 3 AlF 6 AlF 3 CaF 2 Al 2 O 3 bath to assess the electrolyte corrosion resistance . The results show that reaction sintering occurs in the MgAl 2 O 4 MgO Al 2 O 3 AlN system at 1830 °C and 5 MPa in flowing nitrogen for 5 h. The MgAl 2 O 4 MgAlON specimens are obtained and have high bulk density. The flexural strength increases from 202 ± 6 MPa to 248 ± 8 MPa and the Vickers hardness increases from 9.5 ± 0.2 GPa to 12.6 ± 0.4 GPa with increasing MgAlON content from 10 wt% to 40 wt%. The MgAl 2 O 4 MgAlON materials exhibit a good corrosion resistance to the Na 3 AlF 6 AlF 3 CaF 2 Al 2 O 3 bath owing to their high-density and the formation of the composite spinel in the specimens. The corrosion mechanisms of MgAl 2 O 4 MgAlON composites in molten electrolyte are mainly proposed by the dissolution of MgAl 2 O 4 and the diffusion of fluoride. Corrosion kinetic obeys a nearly parabolic law and the corrosion rate decreases with increasing MgAlON content.
研究领域:
材料科学
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无机化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROCERAMICS
·
2023
·Vol. 51
·期 1
·51-58
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IF 1.7
Zhang Yu,Ma Jianli,Li Chang,Chen Chen,She Yubin
The reaction sintering, without calcination and following re-grinding, has been paid increasing attention. Non - stoichiometric Li 2 Mg 3 Sn 1 − x O 6 ( x = 0.00, 0.02, 0.04, 0.06, 0.08, 0.10) ceramics were successfully gained through reaction sintering process in the study, and its phase composition, morphology and dielectric characteristics were studied. This XRD patterns of Li 2 Mg 3 Sn 1 − x O 6 samples prepared after sintering at 1,305 ℃ for 6 h indicates that green bodies are mainly composed of Li 2 Mg 3 SnO 6 phase, accompanied by the second phase of Mg 2 SnO 4 . A host of pores, elliptic - like grains and wrinkle - like grains were visibly observed from the SEM images of Li 2 Mg 3 Sn 1 − x O 6 ceramics, which is because of the severe volatilization of Li elements at high temperature. The apparent density, relative permittivity, quality factor and temperature coefficient of resonant frequency of samples will be devastate owing to porous morphology and Mg 2 SnO 4 phase to a large extent. Finally, when x = 0.08, Li 2 Mg 3 Sn 0.92 O 6 ceramics have optimal dielectric performances: ε r = 9.133, Q×f = 55,429 GHz, τ f = -36.1 ppm/℃.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 51
·期 17
·8139-8147
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IF 2.302
Sun W. Z.,Cheng J. G.,Huang Z. K.,Jiang Y.,Wu L. E.,Liu L. M.
When MgO+ZrO 2 were used as a sintering aid to SiC ceramics, it was found that ZrO 2 reacted with SiC and MgO to form ZrC and a magnesium silicate. This reaction may provide a new route to synthesize ZrC or prepare ZrC/SiC composites by reaction sintering using ZrO 2 , SiC, and MgO as starting materials. In the present work, formation process of the ZrC phase in the SiC–MgO–ZrO 2 system was addressed. Subsolidus phase relations at 1550 °C of the SiC–MgO–ZrO 2 system and the related SiC–SiO 2 –ZrC–ZrO 2 –MgO (Si–Zr–Mg–O–C) system were investigated.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2016
·
IF 0
Shen Qi,Xiao Jian Mao,Bao Yan Chai,Long Zhang
Transparent aluminum oxynitride (AlON) ceramics have been prepared through a method based on direct reaction sintering of alumina and aluminum nitride powders using MgO and Y2O3 as co-additives. The sintering additives could cause the formation of liquid phase during sintering, which would greatly promote the densification and eliminate pores. The grain size of AlON is about 50-100μm. The influence of different component of Al2O3 and AlN as well as sintering temperature on microstructure and optical properties of AlON have been studied. High transparent AlON ceramics with the in-line transmittance of 80.3% at 2000 nm wavelength have been prepared when the concentration of sintering additives was 0.16wt% Y2O3 and 0.02wt% MgO.
研究领域:
材料科学
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光学工程
✓ 已验证
DOI
Optical Materials Express
·
2016
·Vol. 6
·期 2
·610-619
·
IF 2.657
Xianqiang Chen,Haiming Qin,Ye Zhang,Yongfu Liu,Jun Jiang,Haochuan Jiang
Transparent polycrystalline NdxGd3-xAl3Ga2O12 (Nd:GAGG) ceramics were prepared via solid-state reactive sintering from a mixture of commercial Gd2O3, Al2O3, Ga2O3, Nd2O3 and 0.05wt.% ZrO2 powders at 1650 °C. Fully dense ceramics were obtained for all samples with different Nd2O3 doping level. Uniform microstructures with average grain size of about 20 μm were observed in the ceramics, while no secondary phase was detected. Optimum transmittance of as high as 77% in near-infrared bands, which is close to its theoretical value of 81.1%, was achieved in the 0.8 at.% Nd:GAGG ceramics. The spectroscopic properties of the Nd:GAGG transparent ceramics were also investigated. Absorption cross-section of the 0.8 at.% Nd:GAGG ceramic at 808 nm is about 4.1 × 10−20 cm2. The emission cross-section at 1063 nm is about 1.8 × 10−19 cm2.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Wenxin Du,Kailei Lu,Bing He,Xiaolan Zhou,Xu Huang,Jianqi Qi,Tiecheng Lu
In this work, transparent aluminate oxynitride (AlON) ceramic wafers were successfully fabricated by the direct non-aqueous tape casting of Al 2 O 3 /AlN slurry and the one-step reaction sintering for the first time. The reaction sintered AlON ceramic wafer exhibits high transmittance of 73.2 % at the wavelength of 1600 nm. This fabricating route realizes smooth and flexible tape without cracks or pinholes in Al 2 O 3 /AlN system and efficiently shortens the preparation cycle of transparent AlON wafers, which is a feasible way to prepare high-quality transparent AlON ceramics with large lateral sizes and thin thicknesses by reaction sintering, might also promote the application of transparent AlON ceramic wafers.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Membranes
·
2025
·
IF 9.5
Junyou Li,Qilin Gu,Huiqin Zhang,Zhaoxiang Zhong,Yiqun Fan,Weihong Xing
Porous SiC membranes prepared through the reaction sintering between the additive and surface oxidation generated silica have gained increasing attention in the fields of oil-water separation. Previous efforts mainly focused on the types and contents of additives incorporated by physically mixing process, while their distribution on the microstructure and separation performance of SiC membranes has been rarely involved. This work proposed to prepare SiC membranes by uniformly coating AlOOH sol on SiC particles via the electrostatic interaction and the subsequent reaction sintering of the derived SiC@alumina core-shell particles. It is found that the surface coating enabled the homogeneous dispersion of the additives in SiC powder matrix, which not only facilitated the reactive sintering process and notably reduced the amount of residual SiO 2 in SiC membranes, but also homogenized the pore structure. Also, the oxidation pathway of SiC had been altered, which substantially retarded the oxidation degree. Impressively, the as-prepared SiC membranes exhibited 20% improvement in alkali resistance, and enhanced oil-in-water emulsion separation efficiency when compared with those prepared by the conventional mechanical mixing method. Besides, the fouled SiC membranes prepared from the core-shell units can be more efficiently regenerated by using the emerging Joule heating technique. The present work provides a facile and effective pathway to the preparation of high-performance SiC membranes through the reaction sintering of rationally designed core-shell particles for high-efficient separation.
研究领域:
材料科学
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化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Zixu Chen,Peigang He,Wanlin Li,Shengjian Zhao,Dechang Jia,Paolo Colombo,Yu Zhou
Geopolymers with zeolite-like structures can effectively immobilize radioactive ions through their three-dimensional cage-like framework. This study investigated the synthesis of geopolymers via cold reaction sintering using metakaolin, anhydrous and nonahydrate sodium metasilicate for Cs + immobilization. Optimizing the Si/Al molar ratio to 1.5:1 and water content to 20 wt% yielded the best mechanical properties and near-complete reaction. The transient liquid phase formed by the dehydration of sodium metasilicate nonahydrate facilitated densification. CsCl incorporation resulted in a predominantly amorphous phase with the formation of NaCl crystals. Toxicity leaching tests demonstrated Cs + immobilization rate exceeding 91 % for CsCl content below 12 wt%. Short-term leaching tests confirmed low leaching rates (< 4 × 10⁻³ cm/day after 4 days), and leachability indices well above the typically required value of 6 for cement-based matrices. These results establish the viability of cold reaction sintered geopolymers for Cs + immobilization, highlighting their promise for nuclear waste management applications.
研究领域:
材料科学
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核废物管理
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2025
·
IF 4.6
Xianrui Zhao,Mengxian Zhang,Zhanjiang Li,Yangyang Zhao,Xunbai Du,Yunsong Cui,Qiangyong Zhang,Serhiy Serbin
TiB 2 -reinforced ultrafine Ti(C,N)-based cermets are fabricated via reactive spark plasma sintering. This study investigates the effect of carbon sources on the sintering processes, microstructures, and mechanical properties of cermets derived from a Co-Ni-Y-Ti-BN-WC-VC-Mo 2 C-TaC-C system. Results reveal that the sintering process involves both solid-state reactions and liquid-phase sintering stages. Compared to graphitic graphite and graphene, amorphous carbon black and nanocarbon exhibit higher reactivity and smaller particle sizes. This characteristic inhibits the Co Ti and Ti Ni reactions but promotes the Ti-BN reaction, thereby reducing the shrinkage rate during the solid-state reaction stage. During the liquid-phase sintering stage, carbon dissolves into the molten metal and subsequently diffuses into preformed TiN to create Ti(C,N). The use of carbon black and nanocarbon facilitates greater consumption of carbon. Consequently, there is an increase in shrinkage rate during this stage, a reduction in residual carbon within the final sintered samples, and an enhancement in relative density. Moreover, C atoms present in the liquid phase would promote the diffusion of heavy metals into Ti(C,N). When graphite or graphene is used as a source of carbon, Ti(C,N) with a black core/Gy rim structure is obtained. In contrast, employing carbon black or nanocarbon encourages the diffusion of heavy metals toward the center of Ti(C,N). This behavior contributes to the achievement of weak core/rim-structured Ti(C,N) and coreless solid solution particles with finer particle sizes, respectively. As a result of these processes, the synthesized cermet attains an optimal hardness of 2145 HV and K IC of 7.67 MPa·m -1/2 , along with a minimal wear depth of 8.19 μm.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
Additive Manufacturing
·
2022
·
IF 11.632
Fang Su,Zhenbin Su,Yu Liu,Xiao Lin,Jiwei Cao,Zhiyuan Liu,Pei Wang,Changyong Liu,Zhangwei Chen
Vat photopolymerization (VPP) 3D printing of ceramics normally uses ceramic slurries directly made of the target ceramic powder . It may become challenging when the ceramic powders are difficult-to-make and thus are expensive or rarely accessible. We have previously proposed a generative shaping and material-forming (GSM) 3D printing strategy, which involves the use of low-cost multi-component inorganic ceramic precursors as powder sources. The shaping of complex structures was realized through VPP, followed by reaction sintering to form the target ceramic material. In the current study, as a step further, ceramic (Li 2 CO 3 ) and polymer (methyl polysiloxane) combined precursors were employed as an alternative material source for the first time to go through the 3D printing and reaction sintering processes, complementing the application range of the proposed GSM strategy. The slurry formulation and printability, the sinterability of the printed parts and the microstructures and mechanical performance of the sintered parts were characterized and optimized in accordance with the ingredient contents, particularly the stoichiometric ratios of Si:Li in the precursors. As a result, complex-structured Li 4 SiO 4 ceramics with high purity were fabricated based on the use of Li 2 CO 3 ceramic and Si-rich polymer as precursors. Through the advanced characterization and analysis of material phase and microstructural evolution , it was found that the fabricated complex-structured Li 4 SiO 4 ceramics based on a precursor slurry with a solid content of 40 vol%, a Si:Li ratio of 1:2.5, and a sintering temperature of 850 ℃ showed a high phase purity of 97.23% and a compressive strength of 15.24 ± 0.33 MPa, with a skeleton’s relative density of 65.31% is achieved. The results showed greatly enhanced strength at much higher porosities, which might be advantageous and beneficial to structure engineering for mechanical enhancement and the improvement of tritium release effectiveness. Compared with the previous study using multi-component ceramic powder precursors, the ceramics prepared in this study exhibited enhanced microstructural stability and higher phase purity with an advantageously lower sintering temperature. Further analysis revealed that compared with the high temperature solid-state reaction of multi-component ceramic powder precursors, the involvement of the Si-rich polymer precursor enabled the more efficient and complete synthesis of Li 4 SiO 4 as a result of the accelerated covering and cleavage of Si–O–Si bonds on the Li 2 CO 3 particles at a much lower temperature. The present work suggests that the GSM strategy using combined ceramic and polymer precursors as proposed in this study is a promising alternative method to produce high quality Li 4 SiO 4 components with complex structures.
研究领域:
材料科学
·
制造工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2024
·Vol. 53
·期 5
·2240-2249
·
IF 2.2
Shi Zitao,Li Shasha,Zheng Zeyu,Feng Xiaodong,Fang Zixuan,Yang Jun,Tang Bin
The rapidly developing field of wireless communication technology requires advanced microwave dielectric ceramic materials. Here, spinel-structured MgGa 2 O 4 and ZnGa 2 O 4 ceramics were prepared using a reaction sintering method. The effect of sintering temperature was investigated with respect to the crystal structure, microstructure, and microwave dielectric properties of MgGa 2 O 4 and ZnGa 2 O 4 ceramics. Rietveld refinement analysis and quality factor ( Q × f ) values suggested that the occupancy sites and percentage of cations in MgGa 2 O 4 would affect the microwave dielectric properties. Microstructure analysis indicated that abnormal grain growth at higher sintering temperatures would degrade the microwave dielectric properties of ZnGa 2 O 4 ceramics. MgGa 2 O 4 ceramics sintered at 1610°C exhibited promising microwave dielectric properties, i.e., ε r = 9.4, Q × f = 167,500 GHz, and τ f = −63 ppm/°C, while ZnGa 2 O 4 ceramics sintered at 1550°C possessed a higher ε r and a lower Q × f value of 10.5 and 126,900 GHz, respectively, and τ f = −60 ppm/°C. The τ f values of MgGa 2 O 4 and ZnGa 2 O 4 ceramics were tuned to near-zero levels by adding 8 mol.% CaTiO 3 . These results indicate that MgGa 2 O 4 and ZnGa 2 O 4 ceramics produced by reaction sintering show promise for applications in the field of 5G communication.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Junhui Tan,Rongxia Huang,Hua-Tay Lin,Kai Liu,Tianbao Xie,Yejing Dai
CaBi 2 Nb 2 O 9 (CBN) with the Aurivillius phase has a high Curie temperature ( T C ) and remarkable fatigue resistance , which has great potential for application as high-temperature sensors. However, due to its low piezoelectric properties , its practical application remains a great challenge. In this paper, Ca 1- x Ce x Bi 2 Nb 2 O 9 ceramics were prepared by the direct reaction sintering (DRS) and conventional preparation (CP) methods, respectively. The experimental results indicate that Ce doping can increase the piezoelectric coefficient d 33 of CBN ceramics by about two times. Among them, the grain size of the samples prepared by the DRS method is finer and more uniform, and the d 33 value of DRS samples is about 3.6–9.4 % higher than that of CP samples. The DRS sample Ca 0·97 Ce 0·03 Bi 2 Nb 2 O 9 has a d 33 value of 18.9 pC/N, a T C of 948 °C, and a resistivity of 1.1 × 10 5 Ω cm at 600 °C. This study shows that DRS method is an effective densification method, which can prepare CBN-based ceramics with excellent comprehensive properties, and provides an innovative preparation route to explore CBN-based ceramics with excellent piezoelectric properties.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）