John Campbell (casting scientist)

John Campbell is a British materials scientist and engineer known for his extensive work and influential theories in the field of metal casting, particularly regarding the formation and elimination of defects. His research has significantly impacted foundry practices globally, leading to improved casting quality and reduced scrap rates.

Campbell's key contributions center around understanding the fundamental mechanisms of casting defects, such as porosity, inclusions, and surface turbulence. He has developed and promoted a set of "Ten Rules" or "Ten Principles" for sound casting, which outline best practices for mold design, melt handling, and solidification control. These rules emphasize the importance of minimizing surface turbulence, preventing oxide film formation, and promoting progressive solidification.

His research has challenged some traditional views on casting processes, leading to a more scientific and less empirical approach to foundry work. Campbell's work emphasizes the critical role of interfacial energies and oxide film entrainment in initiating many casting defects. He advocates for gentle metal handling, clean melting practices, and carefully designed gating systems to ensure laminar flow and minimize defect formation.

Campbell is a prolific author, having published numerous books and research papers on casting and solidification. His books are widely used in universities and industry training programs. He has also been a consultant to foundries worldwide, assisting them in implementing his principles to improve their casting processes.

He received numerous awards and honors for his contributions to the field of materials science and engineering, including recognition from professional societies and academic institutions. His work continues to influence research and practice in metal casting.