Sinterable Ceramic Powders from Laser‐Driven Reactions: II, Powder Characteristics and Process Variables

Abstract

Si, Si 3 N 4 , and SiC powders which possess a unique set of characteristics were produced by a laser‐driven gas‐phase synthesis process. The powders have a fine particle size (<0.1 μm), are spherical, have a narrow range of particle sizes, are free of hard agglomerates, have a high degree of phase purity, and have a high absolute purity (<0.1% including oxygen). A detailed analysis of the physical, chemical, and crystalline characteristics of Si and Si 3 N 4 is presented. A brief discussion of our initial work with SiC is also included. The dependence of particle characteristics on the various process parameters (laser power, cell pressure, gas composition) is discussed and related to a model of the powder‐synthesis process.