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Experimental Design Applied to the Chemical Durability of Sol–Gel‐Derived Zirconias
Author(s) -
Pavlik Robert S.,
Klein Lisa C.,
McCauley Ronald A.
Publication year - 1997
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.1151-2916.1997.tb03005.x
Subject(s) - alkoxide , sol gel , materials science , nitric acid , durability , differential scanning calorimetry , mineralogy , analytical chemistry (journal) , chemical engineering , chemistry , composite material , organic chemistry , nanotechnology , thermodynamics , metallurgy , catalysis , physics , engineering
A statistical design was used to investigate the effects of various processing conditions on the chemical durability of sol–gel‐derived zirconias. Eight processing variables were investigated: water:alkoxide molar ratio, alcohol:alkoxide molar ratio, nitric acid:alkoxide molar ratio, mixing temperature during hydrolysis, firing temperature, heating rate, soak at firing temperature, and firing atmosphere. Processing variables were set at high and low limits in a main‐effects statistical design. The design identified four critical processing variables (listed in descending order of significance): firing temperature, firing atmosphere, water:alkoxide ratio, and nitric acid:alkoxide ratio. Sol–gel‐derived zirconias were characterized by differential scanning calorimetry, X‐ray diffractometry, and mercury intrusion. Suggestions are offered that may help to explain why these particular processing conditions influenced the chemical durability of sol–gel‐derived zirconias.