What are the general requirements of a refractory material?

The general requirements of a refractory material can be summed up as : • Ability to withstand high temperatures. Ability to withstand sudden changes of temperatures. Ability to withstand action of molten metal slag, glass, hot gases, etc. Ability to withstand load at service conditions.

What are the properties of refractory?

The Physical and Chemical Properties of Refractory Metals

• Physical. Refractory metals are marked by the following key physical features:
• Chemical.
• A Super High Melting Point.
• High Strength.
• Outstanding Abrasion and Wear Resistance.
• Excellent Corrosion Resistance.
• Thermal Shock Resistance.
• Heat and Electrical Conduction.

What are refractories What are the requirements of a good refractory?

A good refractory material should have the following properties:

• It should be able to withstand high temperatures generated in the furnace.
• It should be able to withstand sudden alternating heating and cooling, i.e., thermal shocks.
• It should be able to withstand abrasion and rough usage.

What are refractories give their functions and mention four characteristics?

Refractories perform four basic functions namely (i) acting as a thermal barrier between a hot medium (e.g., flue gases, liquid metal, liquid slags, and molten salts) and the wall of the containing vessel, (ii) insuring a strong physical protection, preventing the erosion of walls by the circulating hot medium, (iii) …

Which of the following insulation is effective for high temperature furnaces?

The flat plate heater insulation is made of ceramic fibers and provides low thermal conductivity, resistance against thermal shock and chemical corrosion, and has high temperature stability. Depending on the amount of insulation required, these boards can be used in single or multiple layers.

What are refractory materials state their basic properties and used?

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. Refractories are polycrystalline, polyphase, inorganic, non-metallic, porous, and heterogeneous.

What is meant by refractory material?

Refractories are materials that are resistant to high temperature, used predominantly as furnace linings for elevated temperature materials processing and other applications in which thermomechanical properties are critical.

What are refractory minerals?

Refractory minerals can be defined as minerals or synthetic inorganic crystal phases that have high melting points. They should also be resistant to deformation and to softening at high temperatures. Refractories are usually classified as acid, basic, or other.

What is refractories and three characteristics?

Refractories are heat-resistant materials that constitute the linings for high-temperature furnaces and reactors and other processing units. In addition to being resistant to thermal stress and other physical phenomena induced by heat, refractories must also withstand physical wear and corrosion by chemical agents.

Which of the following is an example of natural refractory?

Explanation: Chromite, along with graphite, is a common neutral refractory material. Chromite has an approximate fusion temperature of 2180oC while that of graphite is 3000oC. Dolomite and magnesia are basic refractories, whereas silica is an acid refractory.