Alumina-magnesia spinel for refractories synthesized from natural raw materials
- Univ. of Missouri, Rolla, MO (United States). Ceramic engineering Dept.
Spinel is proving to be a high quality refractory for specific applications. Synthesis of spinel in this study involved using either diaspore or bauxite in its raw form. The diaspore was obtained from a central Missouri deposit and the bauxites were obtained from China and Guyana. Diaspore and bauxite source materials need to have a low alkali content and a high alumina content in order to produce a stable refractory spinel. The raw materials are ground below 45 microns and combined with hardbured magnesia, also below 45 microns, in appropriate compositions to yield spinel. Dry mixing was used to obtain homogeneous mixtures of the raw materials and magnesia. Compacts of different compositions were fired at 1,600 C prior to the creep testing. Creep analysis was done to determine the load bearing capabilities and refractoriness. X-ray diffraction and microstructural analysis, including point count analysis and cathodoluminescence, was carried out to determine completeness of the reactions and morphologies of the reaction products.
- OSTI ID:
- 7271706
- Report Number(s):
- CONF-9303210-; CODEN: GAAPBC
- Journal Information:
- Geological Society of America, Abstracts with Programs; (United States), Vol. 25:3; Conference: 27. annual Geological Society of America (GSA) North-Central Section meeting, Rolla, MO (United States), 29-30 Mar 1993; ISSN 0016-7592
- Country of Publication:
- United States
- Language:
- English
Similar Records
Refractory Materials based on Magnesia-Alumina Spinel for Improved Performance in Coal Gasification Environments
Phase analysis program for magnesia refractories
Related Subjects
36 MATERIALS SCIENCE
REFRACTORIES
SYNTHETIC MATERIALS
SPINELS
MECHANICAL PROPERTIES
SYNTHESIS
MATERIALS
MINERALS
OXIDE MINERALS
580000* - Geosciences
360201 - Ceramics
Cermets
& Refractories- Preparation & Fabrication
360203 - Ceramics
Cermets
& Refractories- Mechanical Properties