Boron carbide (B₄C) is one of the hardest known materials, with exceptional mechanical properties such as high hardness, low density, and excellent chemical stability. It is widely used in armor, abrasives, nuclear applications, and wear-resistant components. However, despite its outstanding properties, sintering boron carbide is notoriously difficult. This article delves into the fundamental reasons behind the challenges in sintering boron carbide, exploring its crystal structure, bonding characteristics, thermodynamics, microstructure evolution, and the advanced sintering techniques employed to overcome these obstacles. Supported by images, videos, and scientific studies, this comprehensive discussion provides a deep understanding of why sintering boron carbide is hard and how modern methods address these difficulties. Read More