Ceramic bearings

Table III. Compositions (wt.%) and formula units (fn) of phases in the Pu-bearing ceramic.

Melted (U,Pu)-bearing ceramics are composed of major pyrochlore and minor brannerite and rutile. Their grain size is from 20 to 200 microns which is one or two orders of magnitude larger than in ceramics produced by sintering. Leach rates (7-day MCC-3 test at 90 °C) of Ti, Zr, U, and Pu were found to be (2 -6)xl0 g/(m xday) [118,119]. 

FIGURE 9.12 Firing curves for clay-bearing ceramic compositions. The soaking periods are in hours. 

In addition to bonding ceramics to copper, the DBC process can bond copper to copper, or copper to copper composites, and oxygen-bearing ceramics to copper composites [10]. 

Transportation equipment wiU also post healthy gains, with growth resulting from an acceleration in the production of both aerospace and motor vehicle equipment, as well as through the increased use of ceramics in catalytic converter substrates, engine bearings, ceramic armor for military vehicles, diesel engine particulate filters, and ceramic matrix composite brakes. 

Metal Hip Designs Bearings Ceramic-on- Crosslinked UHMWPE... 

Despite this past downward trend, which has persisted in the United States since 1979 with modernization of large suppHers in Japan and Europe, growth of 2 to 2.5% is now expected into the mid-1990s. This reflects increased demand for some military appHcations and commercial aircraft, plus growing needs for farm and constmction machinery (2). U.S. production of the relatively new ceramic ball bearings is expected to increase distinctively by about 50% yearly to reach 17 million in 1993 (3). 

The bearings are W ater lubricated. The typical materials of construction are carbon, copper alloys, bakelite and ceramics. The mechanical seals, like a double oil seal protected w ith a cap called a Sand Guard, are robust and perfect in sealing the inotor to prevent the entry of pumped... 

The very hard structural ceramics silicon carbide, SiC, and silicon nitride, Si3N4 (used for load-bearing components such as high-temperature bearings and engine... 

For gas temperatures in excess of 380°C, experienced manufacturers often mount the adjustable guide vanes in special ceramic bearings. The shaft end of each blade is fixed to a lever, which is connected to a hinge-mounted adjusting cylinder. Axial movements of the cylinder open or close the blading. 

Lauf-flache, /. bearing surface (Mach.) journal (of tires) tread, -gewicht, n. sliding weight, -glasur, /. (Ceram.) flow glaze, -gummi, n. tread (of a rubber tire). 

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