CERAMICS INTERNATIONAL
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2023
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IF 5.2
Chenghao Zhang,Chun Li,Xiaoqing Si,Jianwei Gao,Junlei Qi,Jian Cao
Cerium oxide (CeO 2 ) in the range of 0–16 mol.% is used to enhance the joint of Ag-based filler for brazing yttria-stabilized zirconia (YSZ) ceramic in the air. Ag–CeO 2 filler is first adopted to braze YSZ ceramic (3 mol.% yttria). The CeO 2 is found to cluster at the interface of YSZ and Ag seam, improving the wetting behavior of Ag-based fillers. The maximum shear strength of YSZ joints can reach 35.1 MPa using Ag–1CeO 2 fillers at 1050 °C/30 min. Moreover, CeO 2 is used to enhance the Ag–CuO filler for brazing YSZ ceramic. As the increase of CeO 2 content, the contact angle of Ag–CuO on the YSZ surface decreases first and then increases. The average shear strength could reach 76.5 MPa using Ag–CuO–8CeO 2 at 1050 °C/30 min. The CeO 2 could decrease residual stress by adjusting the linear expansion coefficient of Ag-based fillers. Therefore, this study provides a new strategy for exploring air brazing fillers.
研究领域:
材料科学
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焊接技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
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2025
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IF 5.6
Yansong Liu,Yongsheng Liu,Yunlei Lv,Yixin Dong,Yejie Cao,Yanxia Du
Multiscale porous yttria-stabilized zirconia (YSZ) ceramics were fabricated via digital light processing (DLP), employing polymethyl methacrylate (PMMA) microspheres as a pore-forming agent. The evolution of microstructure and properties of ceramics, including compressive strength and thermal conductivity, was systematically investigated. The results showed that the porosity and density of the ceramics were 56.43-3.95% and 2.63-5.82 g/cm 3 , respectively, within the sintering temperature range of 1200-1600 °C. Correspondingly, the compressive strength and thermal conductivity of ceramics were 71.00-315.95 MPa and 0.51-2.68 W/(m·K), respectively. At lower sintering temperatures (≤ 1400 °C), multiscale pores formed inside the ceramics due to the decomposition of photosensitive resin and PMMA microspheres. The existence of multiscale pores further reduced the thermal conductivity by an average of 46.08%. In contrast, at higher sintering temperatures (≥ 1500 °C), the density and the mechanical properties of ceramics were significantly improved. In particular, the increase in porosity depended primarily on the increase in pore-forming agent content when the submicron pores disappeared.
研究领域:
材料科学
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陶瓷
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增材制造
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微观结构分析
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力学性能
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热学性能
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2025
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IF 3.8
Yansong Liu,Yongsheng Liu,Yejie Cao,Xiang Zheng,Xiaokun Sun,Yang Xu
Dual porous yttria-stabilized zirconia (YSZ) ceramics were fabricated via digital light processing (DLP) additive manufacturing using polymethyl methacrylate (PMMA) microspheres as pore-forming agent for the first time. The results showed that the introduction of PMMA microspheres effectively reduced the viscosity of the photosensitive YSZ ceramic slurry used in DLP printing, improved the cured depth of the slurry, and did not exert a strong influence on stability. After sintering at 1400°C, pores with dual scales were generated in the ceramics, while exhibiting the optimal physical and mechanical properties. With the increase of PMMA content from 0 to 40 vol%, the open porosity increased from 1.96% to 34.06% and the density decreased from 5.92 to 3.82 g/cm 3 , respectively. The compressive strength and thermal conductivity of porous ceramics decreased from 350.54 to 99.85 MPa and from 2.80 to 1.46 W/(m⋅K), respectively. This investigation opens up new prospects for the fabrication of porous YSZ ceramics with low thermal conductivity and high mechanical properties.
研究领域:
材料科学
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增材制造
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
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2021
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IF 4.527
Xu Rui,Song Jing,Zhao Shijiao,Nie Lei,Deng Changsheng,Hao Shaochang,Zhao Xingyu,Liu Bing,Ma Jingtao
The internal gelation process without cooling at room temperature is a significant challenge for the preparation of yttria-stabilized zirconia (YSZ) ceramic microspheres . In this work, a high-throughput and instant-mixing droplet microfluidic system that can prepare monodisperse YSZ ceramic microspheres was constructed. It mixed two stable solutions at room temperature in an active micromixer at a flow rate of mL/min, and then the mixed unstable precursor solution was quickly dispersed into sol droplets through a coaxial microfluidic device, and the droplets solidified into gel microspheres. The washed and dried gel microspheres could be sintered to obtain ceramic microspheres. Compared with no-micromixing and T-junction micromixers, the system had the best mixing performance and Y and Zr elements in the prepared ceramic microspheres were evenly distributed. Therefore, the system overcame the problem of precursor solution solidification and clogging of the device, and provided a new approach for the internal gelation process without cooling at room temperature.
研究领域:
材料科学
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陶瓷
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微流控技术
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
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