Engineering Crucible Pots: A Review of Kaolin-Based Composites with Functional Additives

Abstract

This review examines the advancements in the fabrication of kaolin-based crucible pots, underscoring the significance of functional additives and processing methodologies on thermal and mechanical efficacy. Although kaolin is plentiful and exhibits thermal stability, it is characterized by brittleness and inadequate shock resistance, necessitating reinforcement for its application in industrial contexts. A comprehensive literature review spanning from 1995 to 2024 was performed utilizing Scopus and Google Scholar as primary sources. Thirteen pivotal studies were scrutinized, indicating that the inclusion of additives such as graphite, alumina, and magnesium oxide markedly enhances mechanical strength, thermal conductivity, and overall durability. Processing techniques, including slip casting and sintering, were predominantly utilized to refine microstructure and minimize porosity. Comparative evaluations demonstrated that locally sourced clays are viable for high-performance applications when appropriately combined with specific additive ratios. The review further emphasizes the criticality of achieving a balanced composition to circumvent performance compromises. It advocates for the implementation of standardized testing protocols, increased utilization of sustainable materials such as agro-waste, and the integration of computational modeling to optimize formulations. These strategies can help produce cost-effective, durable crucibles tailored for modern metallurgical operations.