What are the types of refractory?

The typical refractory materials include fireclay refractories, high alumina refractories, silica brick, Magnesite refractories, Chromite refractories, Zirconia refractories, Insulating materials and Monolithic refractory.

What is refractories and three characteristics?

Basic refractories consists mainly of basic oxides without free silica and resist the action of bases. The most common basic refractories are Magnesite, Dolomite, lime etc. But lime, because of its dehydrating tendency is never used as a refractory.

What is refractory explain?

1 : resisting control or authority : stubborn, unmanageable. 2a : resistant to treatment or cure a refractory lesion. b : unresponsive to stimulus. c : immune, insusceptible after recovery they were refractory to infection. 3 : difficult to fuse, corrode, or draw out especially : capable of enduring high temperature.

What are the types of refractory metal?

There are four distinct refractory metals. They are tungsten, molybdenum, tantalum, and columbium. Tungsten is a steel-gray metal that with impurities is brittle and not very workable but in pure form is very ductile and easy to work with.

What causes refractory failure?

Only after the refractory material has been cured and then dried will it be at its proper strength. Almost all refractory materials (except those that are phosphate-bonded) require both steps. Failure to properly cure cement-bonded refractory material is the primary cause of its failure and lack of longevity.

What is refractory and give example?

The definition of refractory is stubborn or hard to manage, or heat resistant. An example of someone who is refractory is a person who refuses to listen to the rules. An example of something refractory is a material like silica or alumina that are difficult to melt.

Where are refractories used?

Fire clay refractories: They are mostly consumed by steel industries. They are widely used in foundries as well. Magnesium Refractories: Mainly used in the steel industry for the lining of basic converters and open-hearth furnaces. Dolomite refractory: generally used as a repair material.

Why is refractory needed?

The main purpose of refractory material that is used inside a marine boiler is to contain the heat generated by burning of the fuel in the furnace and to minimise heat losses from the furnace. It is therefore important that these materials have insulating properties and are able to withstand high temperatures.

Which of the following characteristics are correct for good refractory material?

A good refractory should have high RUL value. → It is defined as the ratio of its pore volume to the bulk volume. → Porosity is an important property of refractory bricks, because it affect many other characteristics like chemical stability, strength, abrasion- resistance and thermal conductivity.

What are refractories give examples?

Examples of conducting refractories are SiC and ZrC, whereas examples of nonconducting refractories are silica and alumina. Insulating refractories include calcium silicate materials, kaolin, and zirconia. Insulating refractories are used to reduce the rate of heat loss through furnace walls.

What are refractories in civil engineering?

Refractory materials are those that can withstand high temperatures without the heat damaging their structure, resistance, or thermal conductivity. In the case of bricks, the chemical composition of refractories is different from that of regular bricks, which also influences their color and thermal conductivity.

What are the desired properties of refractory clay?

The refractory properties determined include; apparent porosity, bulk density, cold crushing strength, thermal shock resistance, linear shrinkage and refractoriness.

Where are refractories used?

Fire clay refractories: They are mostly consumed by steel industries. They are widely used in foundries as well. Magnesium Refractories: Mainly used in the steel industry for the lining of basic converters and open-hearth furnaces. Dolomite refractory: generally used as a repair material.

What is castable refractory?

Castable refractory cements are used to build and repair kilns, furnaces, and other heat resistant structures. Refractory castables, as they are sometimes called, can be derived from a wide variety of raw materials and cast into any required shape and size.