A modified apparatus for determination of carbon in metals by the low pressure method

✍ Scribed by V.T. Athavale; S.P. Awasthi; N. Krishnamachari; M. Sundaresan; M.S. Varde

• Publisher: Elsevier Science
• Year: 1966
• Tongue: English
• Weight: 496 KB
• Volume: 35
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/s0003-2670(01)81658-5

✦ Synopsis

Since carbon in metals and alloys has a considerable effect on their physical properties, a simple and precise method for its determination is often required. Of the many available methods for determination of carbon at low levelsi-8 the low pressure method ha.. the highest precision and is usually preferred. In this paper the low prcssure method has been improved with important modifications to give a simple and precise procedure, whereby some of the difficulties encountered in previous methods are eliminated. Liquid oxygen is usually employed in the low pressure method for the separation of carbon dioxide from the stream, but because of its hazardous nature, RAMAKRISHNA"rCplaCCd it withliquidairwithamodified trap, However, a large amount of oxygen then condensed during a determination and a long time was required to pump off all the condensed oxygen 10. In an attempt to overcome thcsc difficulties, a. slush bath of isopentane cooled in liquid air to yield a temperature of -160" was used so that no oxygen was condensed whereas carbon dioxide was completely condensed. A differential oil manometer used in the place of the McLeod gauge enhanced the sensitivity of the method. A sample tree was introduced to minimise the blank and the experimental time. This method was standardised and employed for the dctermination of carbon in metals ancl alloys such as uranium, iron, zirconium, stainless steel and cupronickel.