Pore growth during the initial stages of sintering ceramics |
| |
Authors: | O.J. Whittemore J.J. Sipe |
| |
Affiliation: | Ceramic Engineering Division, University of Washington, Seattle, Wash. U.S.A. |
| |
Abstract: | Mercury porosimetry was used to measure changes in pore size distribution during initial stage sintering of compacts of submicron size particles of several oxides. Pore growth was observed in MgO and Fe2O3, and in Al2O3 under certain conditions. Pores can grow by these mechanisms: surface diffusion, particle size distribution effects, particle coalescence, phase transformation, and evaporation/condensation. Surface diffusion may be the mechanism in the case of an alpha alumina. Phase transformation was shown to be the cause when sintering gamma alumina. In the case of magnesia and ferric oxide, particle coalescence appears to be operating. Since pore growth competes with densification for the use of surface energy, it is an important sintering process. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|