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High‐Temperature Behavior of Chemically Treated Silicon Nitride Powders
Author(s) -
Hermansson Leif A.G.,
Burströ Martin,
Johansson Thomas,
Hatcher Michael E.
Publication year - 1988
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1988.tb05868.x
Subject(s) - materials science , silicon nitride , yttria stabilized zirconia , hot isostatic pressing , silicon , raw material , leaching (pedology) , metallurgy , nitride , sintering , composite material , ceramic , cubic zirconia , chemistry , layer (electronics) , environmental science , organic chemistry , soil water , soil science
The mechanical properties of chemically treated, then sintered, Si 3 N 4 was studied. Raw materials consisted of two types of Si 3 N 4 produced by the nitridation of silicon. The chemical treatment involved leaching in different acids (HCl, HNO 3 , HF, and combinations thereof). The powders were sintered by hot isostatic pressing with 2.5% yttria, and the high‐temperature properties of the resultant materials were evaluated by the stepped‐temperature stress rupture (STSR) method (24‐h hold time at 150‐MPa stress at 1000°, 1100°, 1200°, 1300°, and 1400°C). A significant decrease in high‐temperature performance was observed for acidleached powders, especially when HF‐containing acids were used.