Boron Nitride

Boron Nitride is a synthetic technical ceramic material, which is available in powder, solid, aerosol and liquid forms. In solid form it can be machined easily with ordinary metalworking tools. Boron Nitride has out-standing thermal characteristics; high thermal conductivity and excellent thermal shock resistance. Boron Nitride in solid form is available in 3 grades, each having different characteristics

HPBN most common grade is manufactured by hot pressing. Its crystal structure is hexagonal. Due to the uniaxial densification method, the anisotropy of HPBN platelet structure is created. As a result of the anisotropy, different physical properties occur, parallel or perpendicular to the pressing direction. HPBN is non toxic and can be easily machined.

Applications Properties Chemical Composition
Electrical insulators for high temperature applications Excellent thermal shock behaviour Boron

Nitrogen

Oxygen

40-42.6%

49-52.9%

3-5%

Thermocouple tubes High electrical resistivity Calcium

SiO2

2-3%

0.2%

Crucibles and nozzels for

molten metals

Chemically stable B203

Others

0.4

0.03%

Rolls and support elements in the glass manufacturing

industries

Extraordinary thermo cycling properties
High temperature material

Standard shapes and maximum dimensions:

HPBN is hot pressed in block shapes up to 280mm diameter and 300mm height.

We will be pleased to offer made to order parts to your drawings and requirements.

Physical Properties of hot pressed Boron Nitride:

Pressing Direction Parallel Perpendicular
Compressive Strength Mpa 30 48
Young?s modulus RT Gpa 34.1 75.2
Flexural Strength RT Mpa 43.7 60.2
1000°C 12.5 17.4
1500°C 11.8 17.0
Density g/cm³ 1.9-1.95 1.9-1.95
Vickers Hardness kg/mm² 12.01 10.88
Thermal Expansion RT-350°C x10-6K-1 0.0 0.0
RT-700°C 0.67 0.0
RT-1500°C 2.95 0.87
Thermal Conductivity RT W/mK 27.22 30.98
300°C 23.03 27.22
500°C 21.77 26.38
1000°C 20.52 25.54
Max usage temperature

Inert atmosphere

°C 1500 1500
Oxide atmosphere 850 850
Volume resistivity Wcm
RT 1.7×1014 4.0×1014
150°C 1.7×1014 1.9×1014
Dielectric Strength KV/mm >39.4 >39.4

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