Properties Of Refractory Ceramics

Refractory ceramics enable high temperature processing applications.

Properties of refractory ceramics.

Refractories are inorganic nonmetallic porous and heterogeneous. 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. Containers and structural components are usually highly densified while porous components are used for insulation and filtration. As we ve already seen the most important general property of ceramics is that they re refractory.

The base materials are typically alumina magnesia or aluminosilicates though other compositions offer superior performance in specific applications. And thermal processing applications. Important properties of refractories include chemical composition bulk density apparent porosity apparent specific gravity and strength at atmospheric temperatures. Thermal and refractory ceramics include insulating firebricks monolithics and fibers.

Astm c71 defines refractories as non metallic materials having those chemical and physical properties that make them applicable for. They re rough and tumble materials that will put up with fair amounts of abuse in the most ordinary and extraordinary situations. 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. Insulating firebricks are shaped like rectangular slabs and used to line blast furnaces for smelting operations.

All are used in the manufacture of scientific aircraft and military equipment. These properties are frequently among those which are used as control points in the manufacturing and quality control process. Corrosion resistance the refractory material should have high corrosion resistance since these directly contact with hot gases and slag. But engineers also put very different ceramic tiles on space rockets to protect them.

The connection between the properties of ceramic refractories and their chemistry and microstructure is explained in ceramic composition and properties. They are typically composed of oxides of the following materials. Because of the high strengths exhibited by their primary chemical bonds many ceramics possess unusually good combinations of high melting point and chemical inertness.