Mechanical Study247

  (b) CERAMIC MATERIALS:- - Ceramics usually consist of oxides, nitrides, carbides, silicates or borides of various metals.  - Ceramics are any inorganic, non-metallic solids (or super-cooled liquids) processed Or used at high temperatures.  - Ceramic materials are rock or clay mineral materials.  - Ceramic materials contain compounds of metallic and non- metallic elements, such as MgO, Si02, SiC, BaTiO3, glasses, etc. Such compounds contain both ionic and covalent bonds.    - Important characteristics of ceramics are :   (i) Brittleness   (ii) Rock-like appearance  (iii) Resistance to high temperatures  (iv) Hardness   (v) Abrasiveness   (vi) Insulation (to flow of electric current)  (vii) Corrosion resistance   (viii) Opaque to light   (ix) High temperature strength.  - Examples of ceramic materials are :  (i) Sand                  ...

INTRODUCTION TO MATERIAL SCIENCE AND ENGINEERING  MATERIAL Definition :- A material is that out of which anything is or may be made. A material relates itself to matter.                    Materials comprise a wide range of metals and non-metals which must be operated upon to form the finished product.   MATERIAL CLASSIFICATION:-   Most engineering materials may be classed into one of the following types   (a) Metals:- (1) Ferrous (2) Non-ferrous   (b) Ceramics   (C) Organics   (d) Composites   (e) Semiconductors (a) METALS:- Metals play a major role in the industrial and everyday life of human beings. We see hundreds of metal objects and parts which find engineering applications.  - Metals are composed of elements which readily give up electrons to provide a metallic bond and electrical conductivity.  - Metals generally possess the following characteristics : (1) Lustre  ...