Band-casting

The process has the advantage that the green tape is free from porosity since there is no solvent loss and the ceramic powder is very well dispersed with the elastomer uniformly distributed. The tape can be further processed for substrates or multilayer capacitors in the same way as band-cast material. 

A slip for band-casting contains, on a weight basis, 100 parts alumina powder, 9 parts non-volatile organics and 35 parts toluene. The thickness of the dried film... 

Simple shapes are formed by die-pressing, long bodies of uniform section are formed by extrusion, thin plates are formed by band-casting or calendering, and large rings and more intricate shapes are formed by slip-casting. 

The thermal annealing of the 565 and 680 nm bands casts doubt on the correlation of the 575 nm absorption to the 1637 cm infrared absorption in KN3. The correlation rests on the similarity of the growth and annealing be-... 

Band casting and the doctor-blade process are other names. 

Style SC cast elevator buckets are designed primarily for handling foundry sand. SC buckets have an extra heavy body with a reinforcing band cast along the front edge and around the ends to resist abrasion, and are furnished in either malleable or pearlitic malleable iron. 

Extruder Barrel n (extruder cylinder) A thick-walled, cylindrical steel tube, lined with a special hard alloy to resist wear that forms the housing for the extruder screw and contains, between itself and the screw, the plastic material as it is conveyed from feed hopper to die. Barrels are usually surrounded by heating and cooling media, such as electrical heater bands, cast-in-aluminum calrods and tubing for coolant, induction heaters, or, rarely, by a compartmented jacket for the... 

As an indication of the changes in deformation modes that can be produced in ionomers by increase of ion content, consider poly(styrene-co-sodium methacrylate). In ionomers of low ion content, the only observed deformation mode in strained thin films cast from tetra hydrofuran (THF), a nonpolar solvent, is localized crazing. But for ion contents near to or above the critical value of about 6 mol%, both crazing and shear deformation bands have been observed. This is demonstrated in the transmission electron microscope (TEM) scan of Fig. 3 for an ionomer of 8.2 mol% ion content. Somewhat similar deformation patterns have also been observed in a Na-SPS ionomer having an ion content of 7.5 mol%. Clearly, in both of these ionomers, the presence of a... 

Parrott Gun. A type of muzzle-loading cast-iron rifled gun with a wrought-iron band shrunk... 

Buffington and Stevens measured the c.d. of 2-acetamido-2-deoxy-D-glucose as a film cast from HFIP. The spectrum is considerably more intense than that observed by Dickinson and coworkers for a solution in HFIP, but shows the same general features shifted somewhat towards the red. This vacuum-u.v. c.d. spectrum (see Fig. 18) has, at 218 nm, an intense, positive band due to the mr, an intense negative band due to the amide tttt at 200 nm, and a shoulder at 180 nm, but no other significant features down to 145 nm. 

Tetrahydrofuran has been reported to exhibit an absorption maximum at 280 nm (52,56), but several workers have shown that this band is not produced by the purified solvent (30,41,57). Oxidation products from THF have been invoked in order to account for the appearance of the 280-nm band in PVC films that are solvent-cast from THF in air (57. 581. However, in some reported cases (56,59), this band was undoubtedly produced, at least in part, by a phenolic antioxidant (2.6-di-tert-butyl-p-cresol)(59) in the solvent. Since certain -alkylphenols have now been shown to be powerful photosensitizers for the dehydrochlorination of PVC (60), it is clear that antioxidant photosensitization might well have been responsible for some of the effects attributed previously (56) to THF alone. On the other hand, enhanced rates of photodegradation under air have also been observed for PVC films cast from purified THF (57), a result which has been ascribed to radical formation during the photooxidation of residual solvent (57,61). Rabek et al. (61) have shown that this photooxidation produces a-HOO-THF, a-HO-THF, and y-butyro-lactone, and they have found that the hydroperoxide product is an effective sensitizer for the photodehydrochlorination of PVC at X = 254 nm (61). 

For H at T in Ge, Pickett et al. (1979) carried out empirical-pseudopotential supercell calculations. Their band structures showed a H-induced deep donor state more than 6 eV below the valence-band maximum in a non-self-consistent calculation. This binding energy was substantially reduced in a self-consistent calculation. However, lack of convergence and the use of empirical pseudopotentials cast doubt on the quantitative accuracy. More recent calculations (Denteneer et al., 1989b) using ab initio norm-conserving pseudopotentials have shown that H at T in Ge induces a level just below the valence-band maximum, very similar to the situation in Si. The arguments by Pickett et al. that a spin-polarized treatment would be essential (which would introduce a shift in the defect level of up to 0.5 Ry), have already been refuted in Section II.2.d. 

The x(3) values of the PAV cast films were greatly enhanced when the harmonic wavelength was in the absorption region due to n-n transition. This results suggest that the enhancement was caused by the three photon resonance. The maximum x(S) were 0.4 x 10 10 esu at 1475 nm, 1.6 x 10 10 esu at 1600 nm, 4.5 x 10 10 esu at 1900 nm for PPV, MOPPV and PTV, respectively. The values show the tendency that enhancement in x value is accompanied with decrease in band gap of n-conjugated polymer, as theoretically predicted by Wu et al.[34]. 

---