Ceramics and Glasses      

    A ceramic is often broadly defined as any inorganic nonmetallic material． By this definition, ceramic materials would also include glasses; however, many materials scientists add the stipulation that “ceramic” must also be crystalline.      

    A glass is an inorganic nonmetallic material that does not have a crystalline structure. Such materials are said to be amorphous. Properties of Ceramics and Glasses      

    Some of the useful properties of ceramics and glasses include high melting temperature, low density, high strength, stiffness, hardness, wear resistance, and corrosion resistance.      

    Many ceramics are good electrical and thermal insulators. Some ceramics have special properties: some ceramics are magnetic materials; some are piezoelectric materials; and a few special ceramics are superconductors at very low temperatures. Ceramics and glasses have one major drawback: they are brittle.     

    Ceramics are not typically formed from the melt. This is because most ceramics will crack extensively (i.e. form a powder) upon cooling from the liquid state.  Composites        

    Composites are formed from two or more types of materials. Examples include polymer/ceramic and metal/ceramic composites. Composites are used because overall properties of the composites are superior to those of the  individual components.    

    For example: polymer/ceramic composites have a greater modulus than the polymer component, but aren’t as brittle as ceramics.     

    Two types of composites are: fiber-reinforced composites and particle-reinforced composites. 

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Date: 2023-04-10     hits: 336    Return