Seals graphite

Yb-ln-Sb. The ternary YbsI Sbe compound was obtained from a direct element combination reaction in a sealed graphite tube at 973 K, and its crystal structure was determined by X-ray single crystal diffraction methods. It crystallizes in the Ba5ln2Sb6 structure type with a unit cell of a = 0.73992, b = 2.3001, c = 0.45139 (Kim et al., 2000). 

Electrodes. Because of the numerous different processes, there are many different types of electrodes in use (9), eg, prefabricated graphite, prefabricated carbon, self-baking, and composite electrodes (see Carbon). Graphite electrodes are used primarily in smaller furnaces or in sealed furnaces. Prebaked carbon electrodes, made in diameters of <152 cm or 76 by 61 cm rectangular, are used primarily in smelting furnaces where the process requkes them. However, self-baking electrodes are preferred because of thek lower cost. 

In practice, triple alloy is added to a clay graphite cmcible in a refractory-lined vacuum-tight chamber (Fig. 14). Power input is controlled by adjusting the appHed voltage until the charge is melted. A refractory cover is placed over the cmcible and sealed with sand. The furnace cover contains an opening which mates with a port connecting to a condenser. 

Eig. 4. Constmction of a sodium—sulfur battery. A, Negative terminal B, springs plus graphite felt C, sulfur D, carbon E, sodium reservoir E, positive terminal G, iasulator H, aluminum sealing gaskets 1, steel case J, film of sodium K, P-alumiaa tube L, carbon felt M, wick N, aluminum can (67). 

N. J. Fechter and P. S. Petmnich, Development of Seal Ring Carbon-Graphite Materials., NASA Contract Reports CR-72799, Jan. 1971 CR-72986, Aug. 1971 CR-120955, Aug. 1972 and CR-121092, Union Carbide Corp., Parma, Ohio, Jan. 1973. 

Graphites (natural or synthetic) are black semireinforcing fillers used almost exclusively in rotary shaft seal applications where surface lubricity and abrasion resistance must be enhanced (see Carbon, natural graphite). 

The reactor core was made up of stacks of hexagonal graphite blocks. Each fuel element block had 210 axial fuel holes and 108 axial coolant holes (Section 5, Fig. 14). The fuel particles were formed into a fuel compact (Section 5.3) and sealed into the fuel channels. 

---