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.

与压实样品相比，通过在熟石膏 (PoP) 模具上浇注成型透明陶瓷，由于胶体加工具有更好的均匀性，因此透明度更高。然而，源于 PoP 接触的CaSO ₄污染是主要问题。因此，它需要从铸件表面加工几层，这会导致后生加工缺陷。为了解决这个问题，一种铝酸镁（MgAl ₂ O ₄) 尖晶石模具采用本地合成的尖晶石粉末制造，最佳孔隙率为 45-50%，抗弯强度约为 16 MPa。制造的尖晶石模具用于演示使用水基尖晶石浆料的铸造。经傅里叶变换红外研究证实，铸造尖晶石坯料无污染。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的相互连接性。铸在尖晶石和 PoP 模具上的试样，在后加工后，在相同条件下进行烧结（1650°C）和热等静压（1800°C 和 1950 bar）。在尖晶石模具上浇铸证明了样品的无污染表面。它的性能与在 PoP 模具上浇铸的样品相当，但浇铸率更高，废品率最低。