KINETICS OF SINTERING OF RUTILE SINGLE CRYSTAL SPHERES
Abstract
The sintering of single crystal rutile has been studied in air and in reducing atmosphere in the temperature range 900 to 1350 C using a sphereto-sphere model. Rate data show that there are two sintering periods: a slow initial growth characterized by a rate exponent n = 7 and a more rapid subsequent period n = 2. The development of flat surfaces or facets on the particles is used to explain the two periods. A scaling exponent of 3 and an activation energy of 70 kcal/mole indicate that volume diffusion is the sintering mechanism. The initial rate exponent cannot be explained. Increase sinterability of reduced rutile is explained by the defect structure. Facet formation on rutile spheres is discussed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1962
- Accession Number
- AD0282373
Entities
People
- G. Parravano
- H.m. Jr. O'bryan
Organizations
- University of Michigan