Formation of Splats from Suspension Particles with Solid Inclusions Finely Dispersed in a Melted Metal Matrix

Theoretical analysis of cermet splats formation under porous quasi-liquid particle ‘melted binder – suspended ultrafine refractory inclusions’ impacting with substrate

“…Until our papers [18,19] there were no publications devoted to theoretical study of the formation process of cermet splats, deposited on a substrate under full control of the KPPs, including the particle size, the particle velocity, the particle temperature, and the base (substrate) temperature, the free parameter being the volume concentration of ceramic inclusions in the metal binder. The approbation of the derived solution, carried out in [19] with the use of the experimental data [20,21], makes the developed theoretical foundations well-validated.…”

“…The approbation of the derived solution, carried out in [19] with the use of the experimental data [20,21], makes the developed theoretical foundations well-validated.…”

“…But, it is pertinent to note that the theoretical approach developed in [18,19] does not take into consideration the possible inner porosity P in the cermet powder particles, while, as noted above, some commercial nano-and submicrometer structured powder particles are characterized by porosity of 5-30% and higher [8].…”

“…Like in [19], we introduce in our consideration the effective density ρ p , the effective specific heat c p , and the effective thermal conductivity λ p of the ceramic-metal particle material.…”

“…In accordance with [19], at given values of KPPs and at given volume content of refractory ultrafine solid inclusions in a liquid metal binder and porosity P of heterogeneous material, the non-dimensional thickness h s ¼ h s =D p of the cermet splat in the vicinity of stagnation point (2r b k 1 D p , where 1 b k 1 b 1.2) can be calculated using the following approximate formula…”