What are the properties of refractories?

The Physical and Chemical Properties of Refractory Metals

• The Physical Properties of Refractory Metals.
• The Chemical Properties of Refractory Metals.
• A Very High Melting Point.
• High Strength.
• Outstanding Abrasion and Wear Resistance.
• Excellent Corrosion Resistance.
• Thermal Shock Resistance.
• Heat and Electrical Conduction.

What are the desired properties for refractory materials?

Properties Of Refractory Materials

• Bulk density. It is a general indication of product quality.
• Porosity. It is defined as the ratio of its pores volume to its total volume.
• Cold compressive strength.
• Flexural strength.
• Wear resistance.

What is refractories and its classification?

Refractories are classified according to their physical form. These are the shaped and unshaped refractories. The shaped is commonly known as refractory bricks and the unshaped as monolithic refractories. Shaped refractories are those which have fixed shapes when delivered to the user.

What is refractories and three characteristics?

Important properties of refractories which can be determined most readily are chemical composition, bulk density, apparent porosity, apparent specific gravity, and strength at ambient temperatures. These properties are frequently among those which are used as controls in the manufacturing and quality control process.

What are the 5 properties of refractories?

CrO2), Zirconia (ZrO2) Important members of this group are Graphite, Chromite, Zirconia and carborundum (SiC) refractories. 5. 5 Properties of Refractories 1. Refractoriness 2. Strength or Refractoriness-under load 3. Dimensional Stability 4. Chemical Inertness 5. Thermal Expansion 6. Thermal Conductivity 7. Porosity 8. Thermal Spalling 9.

What is dimensional stability of refractory material?

Dimensional Stability Resistance of a material to any volume changes, which may occur on its exposure to high temperature, over a prolonged time. These dimensional changes may be permanent (irreversible) or reversible. Irreversible changes may result either in the contraction or expansion of a refractory.

What are the disadvantages of a porous refractory?

In a porous refractory, molten charge, slags, gases etc. are likely to enter more easily to a greater depth and may react and reduces the life of the refractory material. 16. 16 Properties of Refractories (contd.) 7.

What is the density of a refractory?

28. 1. Bulk density Density of all refractories is an indirect measure of their capacity to store heat. 2. Apparent porosity The porosity of a refractory is a measure of % pores to the (summation of open and closed pores)total weight of a brick.