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NON-OXIDE REFRACTORIES - Coggle Diagram
NON-OXIDE REFRACTORIES
BORIDES
Titanium Diboride (TiB2)
- The most stable of several titanium-boron compounds.
- Synthesized by carbothermal reduction of TiO2 and B2O3.
- Resistant to sintering.
- Densified by hot pressing or hot isostatic pressing.
- Pressureless sintering of TiB2 can achieve high densities but required liquid forming sintering aids such as iron,chromium and carbon.
CARBIDES
Boron Carbide
(B4C)
- Antioxidant additives in magnesia-carbon bricks
(MgO-C bricks).
Tungsten Carbide (WC)
Applications;
- Can be pressed and formed into shapes for use in industrial machinery, tools, abrasives, as well as jewelry.
- Act as coating for materials that used in high temperature.
Properties;
- High hardness (2600 HV)
- Good toughness
- High melting point (2780°C)
- High wear resistance
- Suitable resistance in thermal shock
- Good thermal conductivity
Silicon Carbide (SiC)
- Extremely resistant to flame and mechanical abrasion.
- Has great mechanical strength.
- Highly resistant to most acids, gases and alkalies.
- Installed in the lower and hottest areas of the side walls of the primary combustion chamber.
- Free of foreign bond and contain no fire clay, lime, magnesia or silicate of soda.
NITRIDES
Silicon Nitride (Si3N4)
Properties;
- Low density.
- High temperature strength.
- Superior thermal shock resistance.
- Excellent wear resistance.
- Good fracture toughness.
- Mechanical fatigue and creep resistance.
- Good oxidation resistance.
- Reaction bonded silicon nitride (RBSN)
- Hot-pressed silicon nitride (HPSN)
- Sintered silicon nitride (SSN)
-
SIALONS
Properties;
- High excellent oxidation resistance up to 1300°C.
- Good creep resistance.
- High toughness.
- Has chemical stability and sinterability.
- Used in applications requiring high wear resistance.