LOW COST COATING ON OPTHALMIC RESIN LENSES

Not Available Ceramic lined exhaust and intake ports are critical to the goals of the next generation of high output military diesel engines because of the following benefits: i) increased engine efficiency due to the containment of exhaust gases at higher temperatures, ii) reduction of the burden on the cooling system, and iii) increased life expectancy of the cylinder head and other engine parts. Low thermal expansion NZP ceramics are choice candidates for this application because of their low conductivity, superior thermal shock resistance and their low elastic modulus. For commercial viability, the ceramic lined composite ports should be amenable to routine fabrication using processes such as metal casting. The high resistance to thermal shock of NZP is a big advantage in metal casting, however, mismatch of thermal expansions between the metal and NZP ceramic leads to failure-causing shrinkage stresses after complete cooling of the system. LoTEC, Inc. proposes to develop a commercially-viable technology involving NZP ceramic-lined exhaust and intake ports for advanced diesel engines. For routine fabrication using metal casting and reliability in application, the development and optimization process will be linked to several iterations of experimentation and engineering analysis. Engineering analysis will consist of finite element analysis of (a) cooling shrinkage stresses in complex shaped castings and (b) heat transfer analysis to assess temperature gradient profiles and gradie