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BORON NITRIDE BREAK RINGS, CASTING NOZZLES

BORON NITRIDE (BN) BREAK RINGS AND CASTING NOZZLES

Continuous casting is one of the most common metal manufacturing technologies. The liquid metal flows from a tundish into the mold, in which the strand shell is formed. The metal strand is then taken off continuously or intermittently, at a speed and solidification rate appropriate to the particular alloy.
The ceramic break ring or the nozzle comes into contact with both the melt and the solidified alloy, and must satisfy correspondingly strict requirements:

  • Chemical resistance to the solidified metal, i.e. no contamination of the alloy
  • Good sliding properties, i.e. does not stick to the alloy
  • High thermal shock resistance
  • Defined thermal conductivity
  • High wear resistance
  • Easy to machine

Product Solutions and Applications

With MYCROSINT® we offer a group of different boron nitride materials and boron nitride composites that are matched to different metal alloys. From these materials, we manufacture nozzles or break rings that increase the lifetimes for the following metals:

  • Steels of all kinds
  • Copper alloys
  • Nickel alloys
  • Superalloys
  • Precious metals, particularly gold alloys

We will be glad to support you in choosing the appropriate material.

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Boron Nitride
Material properties Norm Symbol / Unit MYCROSINT®
HD
MYCROSINT®
S
MYCROSINT®
CD
Crystalline phases hex. BN hex. BN hex. BN
Binder phase / Binder type <1%B2O3 4%B2O3 B2O3 + CaO
Orientation dependency Isotropic Anisotropic Anisotropic
II II
Density (typical) DIN EN 623-2 ρ [g/cm3] 1.96 2.07 2.07 1.97 1.97
Total porosity (calculated using theoretical density) DIN EN 623-2 P [%] <13 <7 <7 <12 <12
Brinell hardness DIN EN
ISO 6506-1
HBW
2.5/31.25
10 30 30 13 13
Young’s modulus DIN EN 843-2 E [GPa] 23 35 30 30 25
Flexural strength DIN EN 843-1 σB [MPa] 19 95 85 40 35
Weibull modulus DIN EN 843-1
Compressive strength AAW/
AC-R-302-03
σD [MPa] 36 105 125 50 55
Coefficient of thermal expansion DIN EN 821-1 Thermal expansion behavior: nonlinear, residual elonation after cooling; CTE given indication only
20°C - 500°C α [10-6/K] -1 1 2 -1 -1
500°C - 1000°C α [10-6/K] 0.5 1 2 1.5 2
1000°C - 1500°C α [10-6/K] 2.5 1 5 3 4
Specific heat at 20°C DIN EN 821-3 Cp [J/gK] 0.61 0.6 0.6 0.58 0.58
Thermal conductivity at 20°C DIN EN 821-2 λ [W/mK] 25 40 25 35 35
Maximum temperature of use (oxidizing/inert atmosphere) [°C] 900/1800 1000/
1500
1000/
1500
1100/
1500
1100/
1500
Specific electrical resistance at 20°C DIN EN 50359 ρ [Ωcm] >1012 >1012 >1012 >1012 >1012



Boron Nitride
Material properties Norm Symbol / Unit MYCROSINT®
SO20
MYCROSINT®
SO43
MYCROSINT®
O40
Crystalline phases BN+ZrO2+SiC BN+ZrO2+SiC BN+ZrO2
Binder phase / Binder type 2%B2O3
Orientation dependency Anisotropic Anisotropic Anisotropic
II II II
Density (typical) DIN EN 623-2 ρ [g/cm3] 2.3 2.3 2.92 2.92 2.82 2.82
Total porosity (calculated using theoretical density) DIN EN 623-2 P [%] 10 10 <6 <6 <6 <6
Brinell hardness DIN EN
ISO 6506-1
HBW
2.5/31.25
30 30 85 85 63 63
Young’s modulus DIN EN 843-2 E [GPa] 35 20 45 30 45 25
Flexural strength DIN EN 843-1 σB [MPa] 70 40 120 80 120 80
Weibull modulus DIN EN 843-1
Compressive strength AAW/
AC-R-302-03
σD [MPa] 85 100 175 175 185 185
Coefficient of thermal expansion DIN EN 821-1 Thermal expansion behavior: nonlinear, residual elonation after cooling; CTE given indication only
20°C - 500°C α [10-6/K] 0.5 4.6 2 8 2 6
500°C - 1000°C α [10-6/K] 1.9 6.6 4 9 3.5 9
1000°C - 1500°C α [10-6/K] 0.5 2.2 1.4 4.5 1.5 8
Specific heat at 20°C DIN EN 821-3 Cp [J/gK] 0.6 0.6 0.5 0.5 0.5 0.5
Thermal conductivity at 20°C DIN EN 821-2 λ [W/mK] 45 25 40 30 30 20
Maximum temperature of use (oxidizing/inert atmosphere) [°C] 1100/
1800
1100/
1800
1100/
1800
1100/
1800
1100/
1800
1100/
1800
Specific electrical resistance at 20°C DIN EN 50359 ρ [Ωcm] >1012 >1012 >1012 >1012 >1012 >1012