ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Si3N4 specimens having the composition 88.7 wt% Si3N4-4.9wt% SiO2-6.4wt% Y2O3 (85.1 mol% Si3N4-11.1 mol% SiO2-3.8mol% Y2O3) were sintered at 2140° C under 25 atm N2 for 1 h and then subjected to a 5 h anneal at 1500° C. Crystallization of an amorphous grainboundary phase resulted in the formation of Y2Si2O7. The short-time 1370° C strength of this material was compared with that of material of the same composition having no annealing treatment. No change in strength was noted. This is attributed to the refractory nature of the yttrium-rich grain-boundary phase (apparently identical in both glassy and crystalline phases) and the subsequent domination of the failure process by common processing flaws.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00553273
