Properties Of Refractory Ceramics

This makes them useful as refractories.

Properties of refractory ceramics. Thermal and refractory ceramics include insulating firebricks monolithics and fibers. A refractory material or refractory is a material that is resistant to decomposition by heat pressure or chemical attack and retains strength and form at high temperatures. As we ve already seen the most important general property of ceramics is that they re refractory. Just consider most of us tile our kitchens and bathrooms because ceramic tiles are hard waterproof largely resistant to scratches and keep on looking good for year upon year.

All are used in the manufacture of scientific aircraft and military equipment. Containers and structural components are usually highly densified while porous components are used for insulation and filtration. But engineers also put very different ceramic tiles on space rockets to protect them. Important properties of refractories include chemical composition bulk density apparent porosity apparent specific gravity and strength at atmospheric temperatures.

Refractories are inorganic nonmetallic porous and heterogeneous. Insulating firebricks are shaped like rectangular slabs and used to line blast furnaces for smelting operations. Silicon aluminium magnesium calcium and zirconium. These properties are frequently among those which are used as control points in the manufacturing and quality control process.

The base materials are typically alumina magnesia or aluminosilicates though other compositions offer superior performance in specific applications. Because of the high strengths exhibited by their primary chemical bonds many ceramics possess unusually good combinations of high melting point and chemical inertness. They are typically composed of oxides of the following materials. The ionic and covalent bonds of ceramics are responsible for many unique properties of these materials such as high hardness high melting points low thermal expansion and good chemical resistance but also for some undesirable characteristics foremost being brittleness which leads to fractures unless the material is toughened by reinforcing agents or by other means.

And thermal processing applications. Astm c71 defines refractories as non metallic materials having those chemical and physical properties that make them applicable for. Refractory ceramics enable high temperature processing applications.