CERAMICS INTERNATIONAL
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2022
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IF 5.532
Shengwu Huang,Yanhui Li,Ping Yang,Pengfei Sheng,Jun Ou,Turui Ning,Shanghua Wu
Digital light processing is a vital additive manufacturing technology used for manufacturing ceramic parts. The particle size distribution of ceramic suspensions significantly affects the cure behaviour and mechanical properties of ceramics. In this study, the cure behaviour and mechanical properties of Si 3 N 4 ceramics with a bimodal particle size distribution were studied. The results indicated that the suspension with coarse particles had a higher cure depth for a lower absorbance but poor mechanical properties. The bending strength of the samples with the optimal ratio (coarse:fine particles = 3:7) reached a maximum of 728.7 ± 10.33 MPa, which is 16.5% higher than that of the samples prepared using only fine particles.
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
DOI
高影响因子
MINERALS ENGINEERING
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2024
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IF 4.9
Qi He,Chuanfu Chen,Qinglin Yin,Shihao Ding,Yijun Cao,Xiahui Gui,Yaowen Xing
Coarse particle separation is important in mineral processing. In this study, the performance of coarse chalcopyrite ore separation (−600 μm, Cu grade 0.375 %) by fluidized bed flotation (FBF) was investigated and the basic function of fluidized bed on the particle separation is discussed. The chalcopyrite grain size distribution mainly ranges from 50 to 300 μm, with over 80 % of the grains being liberated. The results indicate that the FBF system can reject tailings with a yield of 48 % and a Cu grade of 0.06 %. Additionally, concentrate Cu grade reaches 0.62 %, which is around 1.65 times higher than feed, resulting in a total Cu recovery of 91.55 %. The introduction of a fluidized bed increases Cu recovery of −600 + 300 μm from 50 % to73%, as it improves the possibility of bubble-particle attachment, but the variation of bed height has little influence. Particles with a size of −300 + 74 μm can obtain a 96 % Cu recovery in the bubbly flow, while particles with a size of −74 μm lose their separation effect due to hydraulic entrainment.
研究领域:
矿物加工
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冶金工程
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浮选技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
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2019
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IF 3.25
Fei Cheng,Ying Feng,Qinqin Su,Daidong Wei,Bin Wang,Yuewen Huang
In this work, a polycarboxylate comb-like polymer was used as grinding aid for ceramic slurry, and the effect of addition of this grinding aid on ceramic process property was highlighted. The grinding efficiency of the polycarboxylate grinding aid (PG) in terms of the particle size distribution and specific surface of unit volume of the ceramic slurry being ground were investigated. Consequently, the PG that was synthesized via free radical polymerization under the condition of an APEG/AA/MA molar ratio of 0.3:1:1, an initiator dosage of 5 wt%, and a reaction time of 6 h at 90 °C, provided better grinding efficiency than those of the triethanolamine and other commercial grinding aids. Specifically, with a dosage of 0.21% and 2 h of grinding, the d 97 and d 50 of ceramic slurry decreased from 13.956 μm and 2.043 µm to 3.739 µm and 0.561 µm, respectively. The cumulative distribution, frequency distribution and SEM results exhibited a uniform particle size distribution for ceramic ground with PG-C. Furthermore, the sintering experiment indicated that a lower processing temperature was capable of producing ultrafine ceramic. These improvements indicated the potential application of the PG as an efficiency ceramic grinding aid, which further facilitating the preparation of uniform ultrafine slurry by a sand mill.
研究领域:
材料科学
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陶瓷工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
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2024
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IF 1.8
Zhiwen Ye,Zongdong Hao,Rui Dou,Li Wang,Weizhe Tang
Ceramic stereolithography 3D printing technology has demonstrated great potential in alumina core manufacturing for advanced turbine blade casting. However, there have been very few photosensitive material formulas specifically designed for alumina core fabrications. Herein, we present the design of a 3D printable ceramic paste based on bimodal particle size distributions for additive manufacturing of high-quality alumina cores. The coarse particles in the paste remain in their original shape while the fine particles transform into platelet-like particles during sintering. The effects of coarse particles, platelet-like particles, and grain growth on maintaining porosity and limiting shrinkage rates are studied. Furthermore, the vacuum sintering process is found to be beneficial for core material properties. The physical properties tests verify that the newly designed alumina paste in this work can meet the application requirement, which is superior to the previous research.
研究领域:
材料科学
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增材制造
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陶瓷工程
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航空航天工程
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2021
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IF 8.071
Belay Tafa Oba,Xuehao Zheng,Moses Akintayo Aborisade,Ashenafi Yohannes Battamo,Akash Kumar,Sheila Kavwenje,Jiashu Liu,Peizhe Sun,Yongkui Yang,Lin Zhao
Calcium peroxide (CaO 2 ) has been proven to oxidize various organic pollutants when they exist as a single class of compounds. However, there is a lack of research on the potential of unactivated CaO 2 to treat mixed chlorinated organic pollutants in soils. This study examined the potential of CaO 2 in treating soils co-contaminated with p-dichlorobenzene (p-DCB) and p-chloromethane cresol (PCMC). The effects of CaO 2 dosage and treatment duration on the rate of degradation were investigated. Furthermore, the collateral effects of the treatment on treated soil characteristics were studied. The result showed that unactivated CaO 2 could oxidize mixed chlorinated organic compounds in wet soils. More than 69% of the pollutants in the wet soil were mineralized following 21 days of treatment with 3% (w/w) CaO 2 . The hydroxyl radicals played a significant role in the degradation process among the other decomposition products of hydrogen peroxide. Following the oxidation process, the treated soil pH was increased due to the formation of calcium hydroxide. Soil organic matter , cation exchange capacity, soil organic carbon , total nitrogen, and certain soil enzyme activities of the treated soil were decreased. However, the collateral effects of the system on electrical conductivity, available phosphorus, and particle size distribution of the treated soil were not significant. Likewise, since no significant release of heavy metals was seen in the treated soil matrix, the likelihood of metal ions as co-pollutants after treatment was low. Therefore, CaO 2 can be a better alternative for treating industrial sites co-contaminated with chlorinated organic compounds.
研究领域:
环境科学
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土壤化学
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污染控制
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）