Microstructural evolution of gas-pressure-sintered Si3N4 with Yb2O3 as a sintering aid
Creators
- 1. Seoul National Univ. (Korea, Republic of). Dept. of Inorganic Materials Engineering
- 2. Korea Research Inst. of Standards and Science, Taejon (Korea, Republic of)
Description
Microstructural evolution of gas-pressure-sintered Si3N4 with Yb2O3 as a sintering aid was observed. Microstructures typical for in situ toughened Si3N4, i.e., large elongated grains randomly distributed in a fine matrix, were observed. However, the size of the elongated grains near the surface was much larger than that at the center, resulting in two distinct regions: an inner region and an outer region. The smaller the amount of Yb2O3 added, the larger the difference in the size of the elongated grains between the outer and inner regions. The difference between the outer and inner regions. The difference between microstructures was diminished when 16 wt% Yb2O3 was added. The microstructural change with Yb2O3 content was attributed to the evaporation of Yb-containing liquid phase from the surface
Additional details
Publishing Information
- Journal Title
- Journal of the American Ceramic Society
- Journal Volume
- 80
- Journal Issue
- 10
- Journal Page Range
- p. 2737-2740.
- ISSN
- 0002-7820
- CODEN
- JACTAW
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 29021254
- Subject category
- S36: MATERIALS SCIENCE; S36: MATERIALS SCIENCE;
- Descriptors DEI
- CONCENTRATION RATIO; MICROSTRUCTURE; MORPHOLOGY; PARTICULATES; SILICON NITRIDES; SINTERING; TEMPERATURE RANGE 1000-4000 K; YTTERBIUM OXIDES
- Descriptors DEC
- CHALCOGENIDES; CRYSTAL STRUCTURE; FABRICATION; NITRIDES; NITROGEN COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; PARTICLES; PNICTIDES; RARE EARTH COMPOUNDS; SILICON COMPOUNDS; TEMPERATURE RANGE; YTTERBIUM COMPOUNDS