The pressing of tungsten fibers

Conclusions

• 1. A study was made of the effects of compaction pressure upon the density of fiber compacts (from 25-, 45-, and 90-μ-diameterwires) held in the die under load or removed from it. It was found that, at any given compaction pressure, compacts pressed from bundles of parallel wires and from random arrays and retained in the die under load have similar densities.

• 2. It was established that, within the tungsten-wire-diameter range investigated (25, 45, and 90μ), the compressibility of fibers is unaffected by their cross-sectional area.

• 3. The values of the coefficients in the compressibility equations for parallel and randomly oriented fibers were determined. Under load, the coefficients for these two types of fiber arrangement are equal, their values being K=1.84 and b=−2.33. In the case of compacts removed from the die, K=2.44 and b= −3.15 for a uniaxial arrangement of continuous fibers and K=1.97 and b=−2.32 for a random fiber orientation.