Interdiffusion in the MgO-Al{sub 2}O{sub 3} spinel with or without some dopants
- Royal Inst. of Tech., Stockholm (Sweden). Div. of Theoretical Metallurgy
- Pennsylvania State Univ., University Park, PA (United States).
With a view to seek an improved understanding of the DIMOX process, interdiffusion of polycrystalline MgO and Al{sub 2}O{sub 3} in the temperature range 1,473 to 1,873 K was studied by diffusion couple experiments. The interdiffusivities in the spinel layer were calculated as functions of composition and temperature. The spinel portion of the phase diagram in the system MgO-Al{sub 2}O{sub 3} was determined from carefully measured compositions at the phase boundaries, and the low temperature spinel region of the phase diagram was confirmed from the present results. For Zn{sup 2+} as dopant in alumina, the growth rate of spinel thickness seems to increase when compared with that of the diffusion couples without dopant. The samples containing Si{sup 4+} as dopant reveal the formation of a glass phase, and the effect of Si{sup 4+} on the diffusion process appears to be negligible.
- OSTI ID:
- 282255
- Report Number(s):
- CONF-950201-; ISSN 0360-2133; TRN: IM9638%%53
- Journal Information:
- Metallurgical Transactions, A, Vol. 27, Issue 8; Conference: Annual meeting and exhibition of the Minerals, Metals and Materials Society (TMS), Las Vegas, NV (United States), 12-16 Feb 1995; Other Information: PBD: Aug 1996
- Country of Publication:
- United States
- Language:
- English
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