Determination of Graphite in Iron Powder and Propellants by Use of Leco WR-12 Automatic Carbon Determinator.
Abstract
Methods are proposed for the determination of graphite in iron powder and propellants by use of the Leco WR-12 Automatic Carbon Determinator, a device depending on thermal conductivity measurement of the carbon dioxide produced on combustion. For iron powder, a 5-g sample is dissolved in a mixture of dilute nitric acid (1 to 1) and hydrofluoric acid, and the solution is filtered through a Gooch crucible containing an asbestos mat. After being washed with water, dilute hydrochloric acid (1 to 1), sodium hydroxide solution, dilute hydrochloric acid (1 to 1), and water in that order, the mat is removed and is mixed with iron chips and copper accelerator, and the carbon is determined by the Leco apparatus. The amount of graphite found in six samples of iron powder ranged from 0.002% to 0.039%. For propellants, a 3-g sample is dissolved in concentrated nitric acid (or a mixture of concentrated nitric acid and hydrofluoric acid, if tin is present) and the solution is filtered through a Gooch. After being washed with dilute nitric acid (1 to 1), acetone, and water, the mat is removed, and the graphite is determined as for iron powder. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1975
- Accession Number
- ADA027858
Entities
People
- George Norwitz
- Herman Gordon
Organizations
- Frankford Arsenal