Determination of Nitrogen in Boron Carbide with the Leco UO-14 Nitrogen Determinator

摘要

Use of various metals as fluxes for releasing nitrogen from boron carbide in the Leco Nitrogen Determinator was investigated. Metals such as iron, chromium, and molybdenum that wet the graphite crucible all promoted nitrogen release. Tin, copper, aluminum, and platinum did not wet the graphite and were of no value as fluxes. A procedure for sample handling and the resulting performance of the method are described. The precision at 0.06-0.6% nitrogen averaged 4% relative standard deviation.