Insights

AIR7359 explains why AMS-AM metal powder feedstock specifications leave certain properties uncontrolled, citing limited applicability and immature standardized inspection methods, and what that gap means for aerospace AM qualification programs.

Single-contact electrification apparatus measures charge transfer from one controlled particle-surface or particle-particle contact, isolating a variable that bulk triboelectric and charge decay measurements can only report as an average.

Two lots that pass the same incoming flowability spec can still granulate differently after roller compaction. The reason usually traces to ribbon density, which responds to roll force, gap width, and feed screw speed as an interacting set, not to roll pressure in isolation.

Talc's expected EU restriction is forcing cosmetic formulators toward mica, kaolin, silica, and starch. None of them reproduce talc's platelet slip, oil absorption, and low dustiness at the same time, and each substitution changes flow and compaction behavior in pressed powder products differently.

Rotary airlocks function as pressure boundaries as much as metering devices. The rotor tip clearance governs particle attrition at the nip zone and the rate of fine-particle bypass under differential pressure. As clearance widens through wear, the downstream particle size distribution shifts in a pattern frequently misread as upstream process variation.

The same screw feeder at the same speed can deliver consistently on one powder and drift by several percent on another. The difference lies in compressibility, wall friction, and cohesion, and in how bulk density shifts as the hopper empties.

Temperature shifts surface energy, contact compliance, and residual moisture state in ways that can reverse a powder's ambient flow behavior. This Insight explains the dominant mechanisms across three temperature ranges and what elevated-temperature testing reveals for SLS powder beds, spray dryer outlets, and heated conveying systems.

Vibration can improve powder discharge when it breaks a weak arch or [...]

Powder residence time matters because the sample and the failure often describe [...]

Do not diagnose a feeder as if the hopper sends it one [...]

A powder operating window defines the process conditions in which a [...]

Fines in powder behavior matter because fine particles add surface area, contact [...]