Materials Science最新文献_第2页

Nonaqueous Gel Casting of AlN Ceramics using Epoxy 环氧树脂非水凝胶铸造AlN陶瓷

4区材料科学

Materials Science Pub Date : 2025-01-02 DOI: 10.5755/j02.ms.39132

Yixuan HE, Xiao‐Hong Wang, Wenzhong LU

{"title":"Nonaqueous Gel Casting of AlN Ceramics using Epoxy","authors":"Yixuan HE, Xiao‐Hong Wang, Wenzhong LU","doi":"10.5755/j02.ms.39132","DOIUrl":"https://doi.org/10.5755/j02.ms.39132","url":null,"abstract":"The AlN ceramics manufactured by a nonaqueous gel casting process were studied. It was shown that trimethylolpropane triglycidyl ether (TMPGE) and tetraethylenepentamine (TEPA) were suitable for the gel casting process through a nucleophilic addition reaction. This system cured at room temperature and avoided oxygen inhibition. The rheological behaviors of the slurries and bending strength of green bodies obtained under different conditions were investigated. Suspensions with a high-solid loading of 59 vol.% and low viscosity (678 mPa·s) were obtained with 1 wt.% dispersant, 20 wt.% TMPGE, and TEPA: TMPGE=1:5. The results showed that the bending strength of the green body is not only associated with the content of TMPGE, TEPA, and solid loading, but also the drying process. The bending strength greatly improved and reached 34.9 MPa after drying at 130 °C, which was strong enough for subsequent processing. With the increase of solid loading, sintered AlN ceramics exhibited higher relative density and thermal conductivity, reaching 99.6% and 152 W/(m·K) at 59 vol.%, while the optimized bending strength of 274 MPa was obtained at 55 vol.%. Meanwhile, complex-shaped ceramics without cracks were prepared.","PeriodicalId":18230,"journal":{"name":"Materials Science","volume":"31 3","pages":"297-302"},"PeriodicalIF":0.0,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://matsc.ktu.lt/index.php/MatSc/article/download/39132/16773","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147881081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation and Performance of Filled Resin Based on Long Afterglow Materials in Gingival Wall Lifting Surgery 长余辉材料填充树脂在龈壁提升术中的制备及性能研究

4区材料科学

Materials Science Pub Date : 2024-12-17 DOI: 10.5755/j02.ms.38204

Yijun ZOU, Yine MEI, Yuling PANG

{"title":"Preparation and Performance of Filled Resin Based on Long Afterglow Materials in Gingival Wall Lifting Surgery","authors":"Yijun ZOU, Yine MEI, Yuling PANG","doi":"10.5755/j02.ms.38204","DOIUrl":"https://doi.org/10.5755/j02.ms.38204","url":null,"abstract":"The study was conducted to solve the problems of low monomer conversion rate and insufficient curing depth of dental resin complexes during curing in gingival wall elevation procedures. A dental composite resin was prepared by modifying the blue emitting long afterglow luminescent material. Then it was applied in the treatment of oral caries for experimental research. The results showed that the afterglow of the SMSED material showed high brightness and blue, with its thermoluminescence peak higher than that of the control group, reaching a maximum of 3 × 106. The curing performance was better. It was 9.17 % higher than CAED and 10.27 % higher than SAED. The accuracy of the measurements for the different resins in the study was about 5.67 %. In addition, the double bond conversion rate of the composite resin doped with 1 wt.% increased by 114.16 % compared to the composite resin without SMSED doping. The structure and size of composite resins containing 1 wt.% research materials were more stable. Overall, the cell survival rate for 1 – 3 days was higher than 70 %, indicating that the modified composite resin had lower toxicity to L929 cells. Overall, the performance of the dental composite resin prepared by modifying the blue emitting long afterglow luminescent material is significantly improved, indicating its effectiveness and practicality. It can be practically applied in the treatment of dental caries in gingival wall lifting surgery.","PeriodicalId":18230,"journal":{"name":"Materials Science","volume":"31 3","pages":"411-418"},"PeriodicalIF":0.0,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://matsc.ktu.lt/index.php/MatSc/article/download/38204/16712","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147908227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pollution Reduction and Carbon Reduction Technology Based on Pressure Swing Physical Adsorption Method in Power Enterprises 基于变压物理吸附法的电力企业污染减排技术

4区材料科学

Materials Science Pub Date : 2024-12-17 DOI: 10.5755/j02.ms.38104

Yujia ZHANG, Gangqiang ZHANG

{"title":"Pollution Reduction and Carbon Reduction Technology Based on Pressure Swing Physical Adsorption Method in Power Enterprises","authors":"Yujia ZHANG, Gangqiang ZHANG","doi":"10.5755/j02.ms.38104","DOIUrl":"https://doi.org/10.5755/j02.ms.38104","url":null,"abstract":"With the increasing global attention to environmental issues and climate change, power companies, as an important energy production sector, are facing severe challenges in reducing pollution and carbon emissions. In view of this, this study is based on the metal organic framework MIL-101(Cr), physically encapsulating metalloporphyrins and synthesizing a FeTPP@MIL-101(Cr) complex. Then, the surface characteristics and adsorption performance of the composite are evaluated, and the pressure swing physical adsorption method is introduced to achieve the goal of carbon reduction and pollution reduction. The ICP-OES loading results showed that the corresponding encapsulation amounts in MIL@-A and MIL@-B composites were 5.24% and 3.20%, respectively. Moreover, when the temperature increased from 273 K to 298 K, the adsorption capacity of all test gases on the three samples showed a decreasing trend. Under ideal atmospheric pressure conditions, the adsorption capacity of MIL@-A encapsulation for CO2 did not decrease and increased, while the adsorption capacity for N2 was relatively small, but still had a certain adsorption capacity. The above results indicate that combining the pressure swing physical adsorption method with FeTPP@MIL-101(Cr) complexes can effectively adsorb pollutants generated by power enterprises, achieve predetermined goals, and help promote clean production in power enterprises.","PeriodicalId":18230,"journal":{"name":"Materials Science","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://matsc.ktu.lt/index.php/MatSc/article/download/38104/16711","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147884316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of Nanomodification on the Microstructure of the Metal of Welded Joints of Low-Alloy Steels 纳米改性对低合金钢焊接接头金属微观结构的影响

IF 0.9 4区材料科学

Materials Science Pub Date : 2024-09-06 DOI: 10.1007/s11003-024-00838-y

V. V. Golovko, V. A. Kostin, V. V. Zhukov