Automated Meter Mix Dispensing Dynamics for Thermally Conductive Gap Fillers
Volumetric displacement precision, shear rate thermal control, and wear-resistant fluid metering govern automated thermal gap filler dispensing performance.
Ceramic Filler Abrasion
Meaning
Degradation of dispensing equipment components caused by the friction of hard ceramic particles suspended within protective fluids or gap fillers. When using high-performance thermal interface materials, ceramic filler abrasion leads to the gradual loss of nozzle tolerance and pump seals. This wear occurs because materials like aluminum oxide or boron nitride contain sharp-edged grains with high hardness values.
Mechanical Wear
Hard particles press against the metal walls of the feed system under high pressure. The abrasive action of ceramic filler abrasion gradually removes micro-layers of steel or tungsten carbide, widening the internal passages. This erosion happens continuously as long as the fluid flows, especially in areas with high velocity or sharp directional changes.
Turbulence increases the frequency of impacts against the internal surfaces, accelerating the destruction of surface coatings.
Component Lifetime
Accelerated wear reduces the life expectancy of dispensing valves and pumps. It forces frequent downtime for maintenance.
Fluid Modification
Adjusting the particle size distribution or using rounded spherical particles can minimize the scraping action against internal channels. Selecting alternative filler materials with lower hardness, such as aluminum trihydrate, offers another way to reduce system wear without entirely sacrificing thermal conductivity. Protective diamond-like carbon coatings applied to critical valve seats also help resist the continuous friction of abrasive pastes.