Accession Number:

AD0649161

Title:

STUDY OF ALUMINA CRYSTAL STRUCTURES (AUTOMATION OF THE VERNEUIL PROCESS).

Descriptive Note:

Final rept., 1 May 62-31 Oct 65,

Corporate Author:

MICHIGAN UNIV ANN ARBOR INST OF SCIENCE AND TECHNOLOGY

Personal Author(s):

Report Date:

1967-03-01

Pagination or Media Count:

25.0

Abstract:

A careful analysis of the basic mechanisms of the Verneuil process led to a methodical study of the many parameters associated with it. Among these, the powder feed rate, boule retraction rate, and flame characteristics were found to be most important. A photoelectric cell was used to sense the plane of crystallization and control its position by means of a servosystem with two outputs, one controlling the retraction rate and the other the powder feed rate. A completely automated Verneuil apparatus, incorporating this and other control systems, was designed and constructed to study crystal growth under well defined, rigidly controlled and dependably reproducible conditions. Author

Subject Categories:

  • Crystallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE