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

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)

Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1967
Accession Number
AD0649161

Entities

People

  • F. A. Reiss

Organizations

  • University of Michigan

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Adaptive Control Systems
  • Adaptive Systems
  • Automation
  • Control Systems
  • Controlled Configured Vehicles
  • Crystal Growth
  • Crystal Structure
  • Crystallization
  • Crystals
  • Isothermal Processes
  • Model Predictive Control

Readers

  • Computer Science/Computer Engineering/Data Science/Digital Signal Processing.
  • Control Systems Engineering.
  • Polymer Science and Engineering.