Abstract
Abstract The carburization of tungsten single crystals through chemical reaction with gaseous acetone at pressure 10−-5–10−-6 torr and at temperature 1500–1800 K has been studied by means of a field emission and a transmission electron microscope. A single-crystal field emitter tip of tungsten is wholly converted into a W2C single crystal after a full carburization : a single-crystal overlayer of W2C initially forms at the tip surface, increasing in thickness until the entire tip is carburized into a W2C single crystal. The carburization takes place in a definite crystallographic orientation and is accompanied by a slight volume expansion and a remarkable change in the tip geometry.
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