Silicon carbide thick plates

Different supports are used, (see Section 10.6.4) with different geometry (discs or tubes), thickness, porosity, tortuosity, composition (alumina, stainless steel, silicon carbide, mullite, zirconia, titania, etc.), and symmetry or asymmetry in its stmcture. Tubular supports are preferable compared to flat supports because they are easier to scale-up (implemented as multichannel modules). However, in laboratory-scale synthesis, it is usually found that making good quality zeolite membranes on a tubular support is more difficult than on a porous plate. One obvious reason is the fact that the area is usually smaller in flat supports, which decreases the likelihood of defects. In Figure 10.1, two commercial tubular supports, one made of a-alumina (left side) and the other of stainless steel (right side) used in zeolite membrane synthesis, are shown. Both ends of the a-alumina support are glazed and both ends of the stainless steel support are welded with nonporous stainless steel to assure a correct sealing in the membrane module and prevent gas bypass. 

Examples of stab resistant body armour are often quite different in constractional character. For example, some comprise a matrix of overlapping metal or composite plates located between fabric layers (based on para-aramid or UHMW polyethylene), others are based on more flexible aramid woven textiles which have been coated with silicon carbide particles to blunt the knife point and others incorporate fine tungsten wire within a knitted fabric matrix. Copying the ancient chain mail concept, similar fine mail constructed from stainless steel or titanium wire may be included as a layer. Obviously the overall weight and thickness of the resulting armour is of crucial importance for the comfort of the wearer but this will be determined largely by the magnitude of the threat. 

Synthesis of chemical vapor deposited (CVD) silicon carbide (SiC) thick plates... 

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