Influence of heat transfer on the application of solid lubricant on hot dies

This paper proposes a mechanism for the build-up of solid lubricant sprayed as a water suspension on a hot surface such as a casting or forging die. During this process, lubricant build-up depends on heat transfer in the die. The proposed mechanism also explains experimental observations of the absence of deposition at high die temperatures, and runoff of lubricant at low temperatures. The model is compared with experiments, and a critical “sticking temperature” is determined for the experimental conditions.