Comparative Study on Compaction and Sintering Behavior of Spray and Freeze Granulated Magnesium Aluminate Spinel Powder

IF 1.5 4区材料科学 Q3 MATERIALS SCIENCE, CERAMICS

Transactions of the Indian Ceramic Society Pub Date : 2021-04-03 DOI:10.1080/0371750X.2021.1887765

S. Manivannan, P. Biswas, P. Barick, S. Kumari, B. Saha, Roy Johnson

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Abstract

Commercially procured magnesium aluminate (MgAl2O4) spinel powder with average particle size of 300 nm and irregular morphology were spray and freeze granulated. The granules were characterized for the texture, strength, granule size and its distribution. In order to evaluate the flowability of granules, rheological parameters, such as Carr index and Hausner ratio were measured. The granules were further subjected to quasi-static compaction under loading, unloading conditions and compaction curves were constructed. Compaction coefficients thus obtained were correlated with granulation conditions and other parameters including green densities. Compacted green samples were also subjected to flexural strength measurements following ASTM standards and fractographs were observed under FESEM. A Carr index of 13.7 and Hausner ratio of 1.16 were obtained for freeze dried granules indicating the superiority in flow behavior as compared to its spray granulated counterpart, thereby showing a better compaction behavior: compaction coefficient of 5.9 in combination with higher true and predicted green density values and lower granule strength of 1.22 MPa. The green samples exhibited a flexural strength of 11 and 12.5 MPa and compressive strength of 2.44 and 1.22 MPa for spray and freeze granulated sample, respectively. The above observations were also complemented by the fractographs. GRAPHICAL ABSTRACT

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喷雾和冷冻颗粒状铝酸镁尖晶石粉末压实和烧结性能的比较研究

对市购铝酸镁尖晶石粉末进行喷雾和冷冻造粒，其平均粒径为300 nm，形貌不规则。对颗粒的结构、强度、粒度和分布进行了表征。为了评价颗粒的流动性，测量了卡尔指数和豪斯纳比等流变性参数。进一步在加载、卸载条件下对颗粒进行准静态压实，并绘制压实曲线。由此获得的压实系数与造粒条件和包括绿密度在内的其他参数相关。压实的绿色样品也按照ASTM标准进行弯曲强度测量，并在FESEM下观察断口。冻干颗粒的Carr指数为13.7,Hausner比值为1.16，表明其流动性能优于喷雾颗粒，从而表现出更好的压实性能:压实系数为5.9，真实绿密度和预测绿密度值较高，颗粒强度较低，为1.22 MPa。绿色试样的抗折强度分别为11和12.5 MPa，喷雾和冷冻颗粒化试样的抗压强度分别为2.44和1.22 MPa。断口图也补充了上述观察结果。图形抽象

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来源期刊

Transactions of the Indian Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

2.40

自引率

8.30%

发文量

审稿时长

2.3 months

期刊介绍： Transactions of the Indian Ceramic Society is a quarterly Journal devoted to current scientific research, technology and industry-related news on glass and ceramics. The Journal covers subjects such as the chemical, mechanical, optical, electronic and spectroscopic properties of glass and ceramics, and characterization of materials belonging to this family. The Editor invites original research papers, topical reviews, opinions and achievements, as well as industry profiles for publication. The contributions should be accompanied by abstracts, keywords and other details, as outlined in the Instructions for Authors section. News, views and other comments on activities of specific industries and organizations, and also analyses of industrial scenarios are also welcome.

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