A firebrick, fire brick or a refractory brick are described as rectangular blocks of refractory-ceramic materials that are used for lining fireplaces, fireboxes, kilns or furnaces, incinerators and cremators. The refractory bricks are primarily manufactured to withstand very high temperatures but will typically have low-thermal conductivity that improves overall energy efficiency. In most cases the dense firebrick is used in the applications that experience extreme chemical, thermal or mechanical stresses, like inside a furnace, or a wood-fired kiln that is subjected to abrasions from fluxing slag or ash, wood long with extreme temperatures.
In situations that are less harsh like natural gas or electric fired kilns, the kiln bricks which are more porous are the preferred choice. These bricks are weaker, yet far lighter as well as more simple to form. They also insulate a lot better when compared to the dense bricks. In either case the firebricks will not spall, while their strength usually holds up very well during the rapid changes in temperature that are common in these applications.
The Manufacturing Processes
When making fire bricks, the https://cheapfirebricks.com/fire-clay-bricks/ is first fired inside a kiln until it becomes partly vitrified. For the specialized purposes they can be glazed. The two sizes which are standard for the fire-brick is the 229x114x76mm and the other 229x114x64mm. These bricks are also made available in what is known as firebrick splits that have ½ the thickness which are commonly used for lining fireplace inserts and wood stoves. Dimensions of the split bricks is usually 229x114x32mm. The firebrick was invented in the year 1822 by William Weston Young.
High Temperature Applications
Silica firebricks which are used to line the steel-making furnaces can withstand temperatures of up to 3000°F, that would usually melt most ceramic type materials. HRSI (High-Temperature Reusable Surface Insulation) which is a material that shares the same make-up was used to insulate tiles on the Space Shuttle.
The non-ferrous metallurgical processes make use of basic refractory-bricks as the slags used during these processes dissolve the “acidic” silica bricks readily. The more common refractory bricks that are used during smelting non-ferrous metal-concentrates are either the magnesite-chrome of chrome-magnesite bricks.
Lower Temperature Applications
There are a variety of other material types that are used in the form of firebricks for the lower-temperature applications. The magnesium oxide bricks are more commonly used for linings in furnaces. The silica bricks are a common brick type that is utilized in inner linings of incinerators and furnaces. Because the inner linings are typically of a sacrificial nature, the fire brick that has alumina content that is higher is often used to extend the duration between the re-linings.
In most cases cracks become visible in these sacrificial inner linings soon after they have been placed into operation. Silicon carbide, which has a higher abrasive strength, is one of the more popular materials for the hearths inside incinerators as well as cremators. The red-clay bricks which are extremely common are used more in applications such as wood-fired ovens and chimneys. Get more info from here: WWW.cheapfirebricks.com