Type of Document Master's Thesis Author Lu, Yangsheng URN etd-10072005-094847 Title Corrosion resistance of NZP and aluminum titanate Degree Master of Science Department Materials Science and Engineering Advisory Committee
Advisor Name Title Hirschfeld, Deidre A. Committee Chair Brown, Jesse J. Jr. Committee Member Kampe, Stephen L. Committee Member Keywords
- diesel engine applicaitons
- thermal properties
Date of Defense 1996-09-05 Availability restricted Abstract
To determine the feasibility of using low thermal expansion ceramics and aluminum titanate in diesel engine applications, the mechanical and thermal properties and corrosion resistance were evaluated. NZP (Ba1.25Zr4P5.5Si.0.5024 and Ca0.5 SrO.5Zr4P6024) and aluminum titanate (AT) were exposed to a simulated diesel engine environment.
The effects of thermal cycling from room temperature to 700°C, and a combination of alkali corrosion and thermal cycling on the mechanical and thermal properties of these ceramics were examined. It was found that NZP and AT materials demonstrated near zero bulk thermal expansion, good thermal up shock resistance and resistance to Na and V corrosion, because of their porous structure and low density. However, the AT materials exhibited lower flexural strength. This is a direct result of the inherent micro cracking across the AT grains upon cooling from the sintering temperature, which reduces the flexural strength and elastic modulus.
Filename Size Approximate Download Time (Hours:Minutes:Seconds)
28.8 Modem 56K Modem ISDN (64 Kb) ISDN (128 Kb) Higher-speed Access LD5655.V855_1996.L8.pdf 22.66 Mb 01:44:55 00:53:57 00:47:12 00:23:36 00:02:00next to an author's name indicates that all files or directories associated with their ETD are accessible from the Virginia Tech campus network only.
If you have questions or technical problems, please Contact DLA.