Kiln Furniture & Refractories

NEWSIC

Overview

The strength of a refractory is determined by the size and quantity of its pores.NEWSIC (high-strength SiC refractory) is a refractory newly developed by NGK that fills the pores of silicon carbide with metallurgical silicon, resulting in porosity that is as close to zero as possible. NEWSIC is five times stronger than conventional SiC refractories, and has superior oxidation resistance and durability, allowing it to be used for long periods even in high-temperature atmospheres. Because of its extremely high strength, it is ideal for the design of thin, lightweight energy-saving kiln furniture and refractories.

Characteristics

NEWSIC can be used for a wide range of applications due to characteristics that include high thermal conductivity on par with copper or aluminum metals, high far-infrared emissivity, and electrical conductivity that resists formation of electrostatic charge.

  • High strength

    Maintains strength that is five times that of conventional SiC refractories at temperatures from normal to high. It allows the weight of kiln furniture for product firing to be reduced by 50% (for larger firing loads and energy savings).

  • High thermal conductivity

    Offers thermal conductivity that is on a par with copper or aluminum metals (approximately 10 times that of conventional refractories). This allows it to withstand sudden temperature changes, permitting a 30 - 40% reduction in firing times.

  • High oxidation resistance

    When heated, a thin oxidation protection membrane forms naturally on the surface (and is regenerated if it becomes damaged). Almost no degradation due to oxidation occurs, extending the refractory lifetime by three to 10 times.

  • Allows complex shapes

    Because bonding is easy and complex shapes can be created, high-precision product design is possible. Can also be used as jigs in the product manufacturing process (semiconductors, liquid crystal, automobiles, and others).

  • High heating efficiency

    Far-infrared emissivity is high, making it close to a perfect black body. When used as a thermal radiator, allows extremely efficient product heating.

  • Electrically conductive

    Because the material is electrically conductive, it resists formation of an electrostatic charge. This prevents dust and other substances from adhering, making it ideal for use in clean rooms.

Beam & Roll

Beam & Roll

Nozzle

Nozzle

Setter with leg

Setter with leg

Plate

Plate

Settter

Settter

Product characteristics

Classication of material NEWSIC Kiln furniture & refractories Fine ceramics
Material Si-impregnated
SiC
Mullite SiO2
bonded
SiC
Si3N4
bonded
SiC
Recrystallized
SiC
Sintering
SiC
Sintering
Si3N4
Density (g/cc) 3.0 2.6 2.8 2.7 2.7 3.2 3.2
Porosity High density porous porous porous porous High density High density
Strength Room temperature (MN/m2) 250 15 50 60 100 450 900
1300°C (MN/m2) 250 13 45 55 100 450 250
Young's modulus (GN/m2) 350 55 60 200 370 300
Thermal expansion coefficient
(10-6/K)
4.5 5.0 4.7 4.7 4.5 3.8 3.8
Specic heat
(350°C) KJ/kg·K
0.7 0.7 0.7 0.7 0.7
Thermal conductivity at R.T.
(350°C) W/m·k
100 2 17 16.3 28 90 15
Electric resistivity (Ω cm) 0.1 1000 10
Oxidation resistance excellent good good good excellent good
Creep resistance excellent good good good good excellent excellent
Thermal shock resistance excellent good good good good excellent excellent
Maximum working temperature (°C) 1350 1400 1500 1550 1600 1650 1200

NEWSIC Manufacture limit

Boards (mm)

Thickness Long side of a rectangle Short side of a rectangle
2 100-300 100-300
3-4 100-310 100-310
5-7 100-600 100-360
8-13 100-735 100-360

Roll (mm)

Outside diameter Thickness Length
φ25 3.5- -2220
-φ28 5- -2220
-φ40 5- -3100
-φ42 6- -3100
-φ55 7.5- -3100
-φ80 8.5- -3100
-φ92 10- -3100
-φ100 11- -3100
-φ130 13- -300

Beam (mm)

Outside diameter Thickness Length
□20 3.5- -2400
-□30 4- -2400
-□40 5- -3100
-□50 6- -3100
-□60 7- -3100
-□80 8- -3100
-□120 10- -120

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