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Capital Refractories has now incorporated their gas diffuser technology into a pressed crucible. The resultant metallurgical treatment crucible is a multi-use, isostatically pressed one-piece refractory vessel with an integral gas supply device.The granulometry of the crucibles walls and base is such that gas can easily travel through it. This allows the gas to enter the metal not just from the base but also the side walls as shown in the animation to the right. The outer wall of the crucible can be coated with an inorganic sealant to inhibit loss of gas through the external surface. Trials have indicated that these crucibles are very effective in imparting the benefits of gas diffusion to metal: homogenising the melt and removing slag particles to the surface. In many cases, there appears...
Capital Refractories has introduced their patented Multicast system for use in ladles with a re-usable lining. This utilises a re-usable isostatically pressed graphitised alumina stopper rod, which typically lasts a minimum of around 10 fills - depending on alloy and temperature. The stopper-rod requires setting only once, resulting in a considerable saving in labour. A disposable fibre gasket (patented) is employed to prevent sticking and leaking. Figure 1 compares the two ladle systems.The Multicast system requires the use of a re-usable chemically bonded high alumina nozzle. The deterioration of the nozzle means that typically, depending on alloy, a nozzle with the Multicast system can be expected to last a minimum of 5 fills before it needs replacing. At this time, the selection of the...
Capital Refractories' patented Unibore nozzle system has been developed and introduced to complement Multicast - the proven reusable stopper system. This unique two component system consists of a re-usable outer nozzle and a second inner nozzle, which is available with a range of bore diameters; a fibre gasket makes the seal between the two pieces. This offers a new method of changing the diameter of the nozzles after each cast by replacing the inner part of the nozzle only.Unibore's unique two-piece nozzle is fundamentally different to conventional one-piece nozzles. There are two major differences. The first is that there is a much larger opening of the outer section of the nozzle compared to a standard nozzle. The second difference is the tapered design of the inner nozzle, whic...
Capital Refractories are now able to offer an extensive series of gas diffuser products for the treatment of melts across a range hot metal industries. Gas purging homogenises the melt and can contribute to the purification of the alloy. Homogenisation aims for equalisation of the analysis and temperature of the metal in the vessel. Gas purging can effect rapid distribution and dissolution of alloying and deoxidising agents and quick adjustent of casting temperature can be achieved. Reduction of deleterious gas content and separation of non - metallic inclusions,with subsequent improvement in metal quality resulting from their elimination from the melt.All Capital Refractories gas diffusers are supplied to suit the customers' requirements with respect to the metal casings and gas feed...
Capital Refractories’ licensed and patented Unibore system, already proven in bottom pour ladles, has been further developed for use with Autopour systems. This unique system utilises a two part nozzle; an outer part which is re-useable and an inner part which offers a wide range of bore sizes. The outer nozzle remains as part of the refractory lining and is changed around once a week. The inner nozzle can be replaced with ease daily and enables the user to alter the bore size for each casting accordingly. The tapered nozzles are far less likely to block than the conventional parallel nozzle. The Unibore system enables a more stable and controllable metal flow and allows for a quicker turn-around of the pouring system. It is complemented by Multicast – Capital Refractories’ reusable stoppe...
Capital Refractories has now incorporated their gas diffuser technology into a pressed crucible. The resultant metallurgical treatment crucible is a multi-use, isostatically pressed one-piece refractory vessel with an integral gas supply device.The granulometry of the crucibles walls and base is such that gas can easily travel through it. This allows the gas to enter the metal not just from the base but also the side walls as shown in the animation to the right. The outer wall of the crucible can be coated with an inorganic sealant to inhibit loss of gas through the external surface. Trials have indicated that these crucibles are very effective in imparting the benefits of gas diffusion to metal: homogenising the melt and removing slag particles to the surface. In many cases, there appears...
Capital Refractories supply a range of earth leakage electrodes (spiders), which are suitable for all sizes and makes of coreless induction furnace.
Capital supply ceramic blanket which offers both acoustic and thermal insulation characteristics. Ceramic Fibre Blanket is a lightweight, flexible, needled blanket made from blown ceramic fibres. The long interlocking fibres make it strong enough for most applications. Ceramic Fibre Blanket is completely inorganic, with no fumes when heating up for the first time.Ceramic Fibre Blanket is a high strength, low shrinkage, highly resilient insulator with low heat storage capacity and complete resistance to thermal shock. It is unaffected by most chemicals except hydrofluoric and phosphoric acids and concentrated alkalis. If wet by water or steam, thermal and physical properties remain unaffected after drying.Fibre blanket is available in a range of densities: 64, 96, 128 and 164 kg m-3 and thi...
Capital Refractories supply vacuum-formed products produced by Brighcross Insulation Limited. Riser sleeves with coned section and integral knife edged "Breaker" section. Wall thickness can be adjusted to suit application. All sizes available in Standard Insulating, Exothermic, Alufibe and Silin grades and can be impregnated with silica for greater erosion resistance.A wide range of products is available as shown and listed below1、Flanged Cone2、Hot tops3、Ingot mould4、Ladles5、Open cones6、Pot liners7、Pouring basins8、Pouring bush9、Pouring cups10、Sampling spoons11、Tap out cones
Capital Refractories supply a wide range of riser sleeves produced for Capital by Brightcross Insulation. The photographs show the wide range (over one hundred) available.Riser sleeves with coned section and integral knife edged "Breaker" section. Wall thickness can be adjusted to suit application. All sizes available in Standard Insulating, Exothermic, Alufibe and Silin grades. Riser sleeves can be impregnated with silica for greater erosion resistance.
Capital Refractories supply formers in steel or copper to customer specifications.
Capital Refractories supply Moist Felt, Foil Wrapped Insulation Boards and bricks for use between ladle shells and the cast lining to control heat loss. They are also used in other applications such as auto-pour units.Moist Felt is supplied in 0.5 m widths and 1 m lengths and 5 mm thicknesses.Foil wrapped Insulation Boards are supplied in a wide range of sizes with thicknesses of 3, 5, 7 and 10 mm.Insulation bricks are supplied in several grades depending on service requirements. For further details click here.
Capital Refractories Capital Refractories supply Refracoarse (a high quality chamotte), fused silica and fused mullite for use by investment casters for core build-up. Closed sizings have low dust levels.The typical chemistries are shown in the table below.Typical sizings are shown in the table below, although other gradings may be available on request.
CerSett is produced by Cermatco and marketed exclusively for the foundries industry by Capital Refractories. CerSett can be made using a range of aggregates and differnet set times. Further details can be found on the Cermatco website.The most common grade is CerSett Z4 which is based on zircon with an average set time of 4 minutes at 20°C.Capital Refractories offer a patching material ideally suited for repairing and sealing investment casting cores.Compositonal details are summarised below:
The slip plane is positioned against the coil screed to provide a smooth surface. This is essential for uninhibited reversible movement of the refractory lining caused by its thermal expansion and contraction. The mica also offers a degree of protection against metal penetration.Capital offer a range of micanites to cover most circumstances and preferences.
Capital Refractories' thermocouples may be used with our Digiterm 97 temperature measuring instrument and lance. The tips are compatible with most other similar machines.Digiterm 97 has the following features:1、Robust.2、Digital LED display (easy to read in foundry conditions).3、Rechargable battery operated.4、Portable.5、Indicates when the thermocouple is open circuit (broken).6、Indicates when the temperature plateau is reached.7、Quick response time, typically temperature reading within 4 seconds.8、Suitable for Type R or S thermocouples.9、Temperature range 500 - 1750℃.10、Ten reading memory.