| 摘要 |
<p>Sintered polytetrafluoroethylene is nondestructively degraded so as to be grindable to a powder of an average size of less than 10 microns by a combination of irradiation by electrons or other subatomic particles in the presence of oxygen or air and concurrent or subsequent heating at temperatures below the melting point of the material. The preferred effective and economic range of irradiation, heat and time at temperature is approximately 50-150 Mrads, 150 DEG F. to 600 DEG F. for at least about one-half hour depending upon desired average particle size and melt flow characteristics and acceptable yields of fine powders.</p> |
