Creep of Si3N4 based ceramics for thermo-mechanical applications

Author(s)

Santos, C. ; Strecker, K. ; Barboza, M. J. R. ; Neto, F. Piorino ; Silva, O. M. M. ; Silva, C. R. M. ; Salgado, L ; filho, FA

• Document type: Journal article
• Source: Materials Science Forum; v. 591-593, p. 3-pg., 2008-01-01.

Abstract

Commercial alpha-Si3N4, Al2O3 and a mixed yttrium and rare earth oxides, RE2O3, were used as starting-powders. Powder batches were milled using different Al2O3/RE2O3 contents, as additive. Hot-pressing was done at 1750 degrees C-30 min-20MPa in N-2 atmosphere. Specimens neat to 6x3x3mm(3) were polished and characterized by XRD and SEM. Specimens were submitted to creep tests, under compressive stresses between 100 and 350 MPa at temperatures ranging from 1250 to 1300 degrees C in air. Higher additive amounts resulted in larger grains of higher aspect ratios and in a decreased anisotropy in the hot-pressed ceramics. The compressive creep behavior depends on the intergranular phase content. While higher amounts of additives resulted in higher creep rates, (epsilon) over dot, and higher stress exponents, n, the activation energy Q(ss), has been inferior for samples with lower additive contents. Grain sliding has been identified to be the predominant mechanism responsible for creep deformation of these ceramics. (AU)