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OXIDE AND NON OXIDE CERAMIC (Oxide ceramics (MAGNESIA (MgO) (Properties…

- - - - Two most important magnesium materials are magnesite (MgCO3) and Brucite ( Mg(OH)2 )
    - - 1 . DEAD BURNING --- hydroxide or carbonate heated from 1500-2000 degree celcius.
      - 2 . HARD BURNING --- hydroxide or carbonate is heated between 1000 to 1500 degree celcius to retain some of its chemical reactivity
      - 3 . LIGHT BURNING --- temperature of heating is kept between 700 to 1000 degree Celcius and product resulting in more reactive
      - FUSION --- hydroxide or carbonate heated to temperature in excess of 2650 degree celcius . This process producing a very dense and inert product.
    - - PH around 10.3
      - Transparency to infrared
      - High thermal conductivity
      - Good refractories
      - Good corrosion resistance
      - Low electrical conductivity
      - white colour
      - Crystalline solid
    - - Deadburned Magnesia
      - Fused Magnesia
      - Calcined Magnesia
    - - FIBERGLASS
      - BOARD
      - LCD
- - - - high strength
      - extreme hardness
      - good resistance to high temperatures
      - ood electrical conductivity
      - excellent resistance to oxidation.
      - chemically stable against numerous molten metals.
    - - Solution phase reaction - NaBH4 and TiCl4, followed by annealing the amorphous precursor obtained at 900–1100 °C
      - Mechanical alloying - a mixture of elemental Ti and B powders
      - Self-propagating high temperature synthesis process - addition of varying amounts of NaCl.
      - Milling - Self-propagating high temperature synthesis
      - Solvothermal reaction - benzene of metallic sodium with amorphous boron powder and TiCl4 at 400 °C
    - - Cathode material for aluminum smelting flux electrolysis
      - Sputtering target for hard material coatings
      - Evaporator boats
      - Crucibles for non-ferrous metals
      - Manufacture of cutting tools
      - Ballistic protection
    - - synthesized by the carbonthermal reduction method using TiO2 (rutile), graphite and B2O3
    - - 98% in mass
      - crystal granularity is perfect
      - average particle size is 2-3 μm.