Summary

This unit has introduced the thermal properties of materials relevant to utilizing materials at elevated temperature. Materials along high melting point, stability & resistance to oxidation at high temperature have been explained as ceramics refractory materials. Such inorganic compounds as oxides, borides, nitrides etc., their properties & limits of application have been explained. The factors which might affect their behaviour have also been brought out. These materials, because of their hardness and inability to deform plastically are not machinable at room temperature. Description of manufacturing methods of products in such materials has been given.

Brief description of glass and its types has also been given for elaborating similarities among glass and ceramics.

Refractory metals as those have very high melting points, like Re, Ta ,Mo and W might also be utilized for high temperature application. Their alloys likewise do not melt early but both metals & alloys are susceptible to oxidation and therefore can be used only with coating. They are complicated to form at room temperature.

Abrasive materials are utilized for smooth finishing application of for cutting hard to cut surfaces. Such abrasive materials in form of particles of varying size are bonded to generate grinding wheels. Brief description of wheels, strength, bonding etc. is given.