Fast firing

Modification of the thermal cycle provides opportunities to improve the sinterability of powder compacts. Typical examples are fast firing and heating-rate-controlled sintering. 

Fast firing was proposed by Brook et as a technique to suppress grain 

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Ceramics. In ceramics, talc is widely used in wall tile and hobbyware bodies, in electrical porcelains, and in cordierite formulations. Wall tile and hobbyware ate talc—clay bodies that ate pressed and fast-fired to a high porosity (bisque) and then glazed and tefired to produce the final product. Talc containing tremolite and carbonate is preferred to ensure good porosity. 

The results of development work on processes indicate that the two main methods of preventing the duplex microstructure from forming appear to be fast-firing, or increasing the amount of / "-alumina at low temperatures. Based on these results, Duncan et al. [20] and Zyl et al. [21] have described production processes starting from aluminum oxy-hydroxides or aluminum hydroxides as precursors for the synthesis of the solid electrolyte "-alumina. Duncan et al. described an alumina precursor which substitutes in part or wholly for or-alumina in an established... 

Combustibility Bulk material fire Dust explosion Aerosol ignition and fast fire Flash fire of vapors from heated combustible solid or liquid... 

Self contained dual agent systems, (foam/water and dry chemical), are provided for manual fire fighting efforts against three dimensional pressure leaks and large diameter pool fires. The design affords fast fire knockdown, extinguishment and sealant against re-flash. A skid... 

Light-fastness Fire performance Compact laminate only ... 

The propellant charge are prepared by packing them one by one in a piece of Japanese paper. The charges must be distinguished for each size of mortar by wi iting a large number on them(this is not necessary for fast firing which is described later) ... 

SiC kiln furniture, the heat consumption was 31.400 kJ/kg of ware in fast firing the consumption can be reduced to 12.600 — 14.000 kJ/kg (Harms, 1978). In another tunnel kiln for the firing of porcelain flat ware, the heat consumption was 24.300 kJ/kg (firing cycle 21 hours, 1430 °C). For decorative firing at 960 C, the consumption was 3800—4600 kJ/kg. According to Schroder and Goerg (1978), a value lower than 2400 kJ kg of fireclay bricks has been achieved in a modern tunnel kiln. A similar heat consumption is reported for modern brickmaking tunnel kilns (Staff Report, 1977). 

Kiln furniture must be made of materials resistant to considerable temperature cycling in particular, during fast firing the changes in temperature are quite rapid (heating rate up to 30 — 40 ""C min ). A low thermal expansion coefficient and/or high thermal conductivity are therefore required. These requirements are best met by cordierite-mullite materials up to 1300 ""C and SiC-based materials for higher temperatures. 

Fast firing, 295 Fayalite, 307, 387 Feldspars, 42—45 Ferric oxide, 32 Ferrite ceramics, 328—333 Ferrites, 328—331,379—380 synthesis of, 331 — 332 Ferroelectric ceramics, 322—327 Ferroelectric glass-ceramics, 236 Ferromagneticceramics, 328—333 Fibre optics, 216 Fibreous insulations, 394 Fibres, 215-217 Fictive temperature, 58 Fireclay, 34, 370-371 Fireclay brick, deformation of, 356—358 Fireclay refractories, 370—373 Firing, 273—297 fast, 295... 

Mostaghaci H, Brook RJ (1983) Production of dense and fine-grain size BaTi03 by fast firing. Trans J Brit Ceram Soc 82 167-170... 

Colour coded red with black colour zone - these are suitable for class B type fires and are also ideal for electrical hazards because CO is non-conductive. CO is an extremely fast fire control medium. These extinguishers deliver a powerful concentration of CO gas under great pressure, which smothers the flames very rapidly by displacing air from the local area of the fire. CO is a non-toxic, non-corrosive gas that is... 

Figure 11.8. Schematic showing the thermal cycle of conventional sintering, fast firing, and...

Figure 9.51 Experimental results for microstructural development in AI2O3 doped with 200 ppm MgO, showing the grain size versus density trajectories for fabrication by hot pressing, conventional sintering, and fast firing. (From Ref. 90.)...

Figure 9.52 Under conditions where the densification mechanism has a higher activation energy than the coarsening mechanism, a fast heating rate to high firing temperatures (fast firing) can be beneficial for the achievement of high density.

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