用无污染尖晶石模具滑移铸造透明尖晶石的胶体成形

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

Transactions of the Indian Ceramic Society Pub Date : 2022-01-02 DOI:10.1080/0371750X.2022.2054473

S. Singh, P. Biswas, Roy Johnson

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引用次数: 0

摘要

与压实样品相比，通过在巴黎石膏（PoP）模具上滑动铸造成型透明陶瓷可提高透明度，因为在胶体加工中具有更好的均匀性。然而，由源自PoP接触的CaSO4引起的污染是一个主要问题。因此，它需要从铸件表面加工几层，这会导致后绿色加工缺陷。为了解决这一问题，用国产尖晶石粉末制造了铝酸镁（MgAl2O4）尖晶石模具，其最佳孔隙率为45-50%，弯曲强度为~16MPa。所制备的尖晶石模具用于演示使用水基尖晶石浆料的铸造。傅立叶变换红外研究证实，铸造尖晶石坯料没有污染。尖晶石模具的微观结构揭示了通过场发射扫描电子显微镜获得的孔隙的互连性。在尖晶石和PoP模具上铸造的试样，在后机加工后，在相同的条件下烧结（1650°C）和热等静压（1800°C和1950巴）。在尖晶石模具上铸造表明样品表面无污染。然而，它的性能与在PoP模具上铸造的样品相当，提高了铸造速率，并将废品率降至最低。图形摘要

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Colloidal Shaping of Transparent Spinel through Slip Casting Using Contamination Free Spinel Moulds

Shaping transparent ceramics through slip casting on plaster of Paris (PoP) moulds offers improved transparency compared to compacted samples due to better homogeneity in colloidal processing. However, the contamination due to CaSO4 originated from the PoP contact is a primary concern. Therefore, it demands the machining of several layers from the cast surface that results in post-green machining defects. To address this concern, a magnesium aluminate (MgAl2O4) spinel mould was fabricated with indigenously synthesized spinel powder with optimum porosity of 45-50% and flexural strength of ∼16 MPa. The fabricated spinel mould was used to demonstrate the casting using water-based spinel slurry. The cast spinel blanks were found contamination free as confirmed by Fourier transform infrared studies. Microstructures of spinel moulds revealed the interconnectivity of the pores obtained by field emission scanning electron microscopy. Specimens cast on spinel and on PoP moulds, after post machining, were sintered (1650°C) and hot isostatically pressed (at 1800°C and 1950 bar) under identical conditions. Casting on spinel moulds demonstrated a contamination free surface of the samples. Its properties are at par with the samples cast on PoP moulds, however, with improved casting rate and minimum rejection. GRAPHICAL ABSTRACT

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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.