检索结果-南通市图书馆

Chinese Journal of Structural Chemistry 2013年第3期32卷 369-374页

作者：罗金荣阮玉忠林寿陈捷 College of Materials Science and Technology Fuzhou University (New Campus)

A two-step sintering method was used to prepare Al8.31Si1.91Mg3.78O20 （corundum solid solution）/Al4.8Si1.2O9.6 （mullite solid solution）/Mg2.0Al4.02Si4.98O18 （cordierite solid solution） multiphase material, for the purposes of making these three crystal structures have point defects which could help the particles diffuse and transfer at high temperature, accelerate the sintering efficiently and enhance the material strength as well as the bulk density. The impacts of different formulas on the structure and properties of the multiphase material were investigated. With XRD and SEM analyses, for each sample, the crystal structure and microstructure were characterized, the crystalline phase content and cell parameters were determined with Rietveld Quantification software, and the properties were tested. The comparative optimal formula determined was calcinated chamotte of 80wt% and calcinated sludge of 20wt%; and its corresponding bending strength and retention rate of bending strength after a thermal shock were 29.74 MPa and 80.15%, respectively.

关键词： corundum solid solution mullite solid solution cordierite solid solution multiphase material formula

Preparation and Structural Defects of Al_(2-x)Zr_(x+y)Ti_(1-y)O_5 and Al_(4.54)Si_(1.46)O_(9.73) Multiphase Material

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2012年第2期31卷 155-160页

作者：罗金荣阮玉忠林寿 College of Materials Science and Technology Fuzhou University(New Campus)

In the study, sludge from the aluminum profile factory and kaolin were used as the raw materials. Through adding ZrO2 mineralizer in different contents, Al2-xZrx＋yTi1-yO5 and Al4.54Si1.46O9.73 solid solution multiphase material was prepared to effectively inhibit the decomposition of aluminum titanate solid solution and optimize high temperature property of the multiphase material. With XRD and SEM means, crystalline structure and microstructure of each sample were characterized, and properties of each sample were tested. According to experimental results, the optimal addition amount of ZrO2 mineralizer was determined to be 1.5%. Correspondingly, contents for aluminum titanate solid solution, mullite solid solution and α-Al2O3 were 70.3%, 26.8% and 2.9% respectively, bulk density was 3.20 g/cm3, degree of porosity was 5.57%, water absorption rate was 1.74%, and the once thermal shock rupture strength retention rate was 90.52%.

关键词： ZrO2 mineralizer aluminum titanate solid solution mullite solid solution crystalline phase property

Structure and Photoluminescence of mullite-Ge Nanocomposite

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2008年第6期23卷 787-790页

作者：高乐王皓 State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Al12Si3.75Ge0.25O26 ceramic powder was prepared by sol-gel method using Al（NO3）3,Si（OC2H5）4 and Cl3GeCH2-CH2COOH as *** structural formation of Al12Si3.75Ge0.25O26 ceramic powder was analyzed by *** reduction by flowing H2/Ar mixture gas,strong room temperature photoluminescence （PL） can be observed at 565 nm,613 nm,682 nm,731 nm and 777 nm,*** PL intensity scarcely depends on the reduction temperature and duration,while the sample reduced at 500 ℃ for A^3 hours has the highest PL *** and after reduction at 500 ℃,the volume of unit cell of mullite solid solution decreases to 0.4699 *** on the analysis of XPS and Raman spectra,it can be approved that the PL phenomenon at room temperature is caused by the embedded Ge nanoparticles with the average size of about 1.95 nm.

关键词： mullite solid solution sol-gel Ge nanoparticles photoluminescence

Effects of BaF_2 on Preparing mullite with Sludge from the Aluminum Profile Factory and Pyrophyllite

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2010年第11期29卷 1697-1701页

作者：陈永瑞阮玉忠曾景旭陈奇俤杨超 Material Science and Engineering School (at New Campus) Fuzhou University

In this study, sludge from the aluminum profile factory and pyrophyllite were used as major raw materials to prepare mullite. Through determining optimum formula, the optimum calcination temperature and optimum temperature retention time as well as the effects of BaF2 mineralizer on the crystal structure, microstructure and properties of mullite were studied and the optimum BaF2 mineralizer dosage was determined. With XRD and SEM methods, the crystal structure and microstructure of each sample were characterized. With Rietveld Quantification method, crystal phase content in each sample was determined and properties of each sample were tested. Based on the comprehensive analysis result, it was determined that optimum BaF2 dosage was 0.5%, the fairly good calcination temperature was 1550 ℃, and the corresponding mullite solid solution content was 95.8%.

关键词： CaF2 mineralizer mullite solid solution crystal structure microstructure property