• Ceramic Overview
  • Ceramic Grades
  • Ceramic Specification

Ceramic Overview

Boron Nitride Ceramics can be offered in many forms including Powder, Paint, Paste, Aerosol and in Hot pressed solid form along with Pyrolytic Boron Nitride (PBN) a Chemical vapour deposition material.

Hot pressed boron nitride has a hexagonal structure similar to that of graphite. Although HPBN is an insulator with outstanding properties in Temperature, Dielectric constant, Thermal shock, Thermal conductivity. It can also be easily machined into intricate shapes with no post firing necessary.

Hot pressed boron nitride is a powder which is sintered at 2000 deg C plus. Depending on the process there are several grades that can be selected for your requirement.

Whether its extreme high temperature high vacuum using no binder due to thermal extraction to moisture resistance using calcium borate glass as a binder. There is a grade of HPBN for most applications.

Hot Pressed Boron Nitride Composites change the Boron Nitride properties. Adding zirconia for molten metal applications such as break rings for horizontal casting or Silica for unparallel resistance to thermal shock and resistance to moisture and Aluminium nitride for excellent thermal properties.

Pyrolytic Boron Nitride with its intrinsic purity makes it the right choice for microwave and Semiconductor components and standard crucibles for MBE and Gallium Arsenide crystal production.

Properties Applications
High electrical resistivity High voltage electrical insulators
High temperature material Heat treatment insulators and fixture
Corrosion resistant Break rings for continuous casting of metals
Excellent lubricating properties Crucibles for high purity molten metals
Excellent thermal shock resistance High temperature lubricant
Good chemical inertness High temperature valves
High dielectric strength Atomising Nozzles
High thermal conductivity Refractory applications
Low density PVD insulators and shields
Non-wetting Insulating Stand offs
Good machinability Vacuum furnace supports

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Ceramic Grades

The below table contains Ceramic material grades supplied by Thermic Edge

Ceramic Grade Description
BN50 BN50 utilises B203 as a binder to enhance the strength of this Boron nitride grade. This general-purpose grade lends itself well for high temperature insulators, kiln furniture. Operating temperature 1000 deg C
BN100 Its binder system of Calcium borate allows this grade to have minimal moisture exposure, along with low thermal expansion and high thermal shock resistance with increased spall resistance. BN100 is ideal for light metal applications such as aluminium, magnesium and zinc. Operating temperature 1000 deg C.
BN150 Excellent thermal shock and with low thermo cycling behaviour coupled with high dielectric strength, this grade utilises its strength in processing the powders prior to pressing, so there is no post firing of this pure material. Operating temperatures up to 1800 degrees C in inert or high Vacuum.
BN300 The purest of all the grades of Boron nitride. Post firing allow operating temperatures past 2000 deg C. This grade is self-bonded so there is no outgassing at extreme temperatures, allowing the use for insulators and crucibles for high purity processing
ABN1000 Boron Nitride composite utilising Aluminium nitride for excellent thermal properties. This composite has high mechanical strength, excellent thermal conductivity, low thermal expansion and very good ability for a vacuum seal.
ZBN100 A composite designed for molten metal use such as Break rings, side dams for thin strip casting and atomising nozzles. Zirconia enhances the BN giving outstanding wear resistance along with non-wetting properties.
MBN100, M2BN100 Both grades have added Silica to the BN in different ratios. This gives flexibility on strength thermal conductivity, and when moisture resistance is required. These grades offer excellent thermal properties, high dielectric strength yet a low dielectric constant, making it useful for microwave environments. They have also been tested to MIL-l-10A grade of L542 test a procedure requiring immersion in water for 48 hours prior to testing at elevated frequencies.
Macor A machinable glass ceramic with excellent physical properties, high dielectric strength and electrical resistivity. Macor is nonporous non shrinking and withstands high temperature which allows this glass ceramic to be metallised.
Pyrolytic Boron Nitride PBN is a ceramic made by a chemical vapour deposition process which gives this material a very unique character. Intrinsically pure, it’s the ideal choice for furnace, electrical components, microwave and Semiconductor applications. Industry standard crucibles such as VGF, LEC, Bridgman for Gallium Arsenide crystal production and auxiliary effusion cell hardware. PBN/PG Heaters can also be manufactured to provide extremely uniform temperature profiles for both compound and semiconductor manufacturing. With bulk impurities at less than 100 parts per million and metallic impurities less than 10 parts per million, PBN will not react with acids, alkalis, organic solvents, molten metals and graphite’s.

Ceramic Specification

The below table contains Ceramic material grades supplied by Thermic Edge

  BN50 BN100 BN150 BN300 M2BN100 MBN100 ZBN100 ABN1000 Shapal M Lite PBN Macor
Crystalline phase Hexagonal BN Hexagonal BN Hexagonal BN 99% Heagonal BN >99% BN-60% SiO2-40% BN-40% SiO2 60% BN-45% ZrO2-45% BN-72% Aln-23% Yttria-5% BN-75% Aln- 25% N/a N/a
Binder Phase/ Binder type Boric Oxide calcium Borate Boric Oxide Self Bonded SiO2 SiO2 Borosilicate n/a n/a CVD process Mica flakes
Colour White White White White White White Grey Grey cream Cream white
Typical Applications General Purpose Outstanding moisture resistance, Refractory, Dielectric strength High temperature and purity. Dielectric strength, Low expansion, high thermal conductivity Extreme corrosion resistance, high purity temperature, thermal conductivity Extreme thermal conductivity, Moisture resistance, Dielectric strength Extreme thermal conductivity, Moisture resistance, Dielectric strength Extreme wear and corrosion resistance in molten metal applications Extreme high thermal conductivity and flexural strength comparable with Alumina Extreme high thermal conductivity and flexural strength comparable with Alumina Demanding applications when the very best purity, temperature is required such as MBE Low thermal conductivity, radiation resistance, can also be metallised
Directionality Parallel / Perpendicular Parallel / Perpendicular Parallel / Perpendicular Parallel / Perpendicular Parallel / Perpendicular Parallel / Perpendicular Parallel / Perpendicular Parallel / Perpendicular n/a A & C direction n/a

 

Mechanical Properties

Flexural strength 94 / 65 59 / 45 14 / 30 22 / 21 62 / 34 103 / 76 144 / 107 300 300 mpa 27500 PSI n/a
Young Modulus 47 / 74 40 / 60 n/a 17 / 71 N/A 94 / 106 71 / 71 34.1 / 75.20 1.8 x 10+4 n/a 66.9 gpa
RT Compression 143 / 186 96 n/a 25 N/A 317 / 289 218 / 253 1070 100 kg/mm 37000 A direction 48,000 C direction Units PSI 345 mpa
Open porosity 2.84 N/A 15 19.3 6.7 6.88 1.066 0 0 0 0
Density     (g/cc mm2) 2 2 1.9 1.9 2.1 2.3 2.9 2.9 2.88 1.95 – 2.19 2.52
Hardness- Knoop (KG/mm2) 20 16 5 4 N/A N/A 100 342 380 n/a 250 Knopp

 

Thermal Properties

Thermal conductivity @ 25 deg C W/mK 30 / 34 27 / 29 21 78 / 130 24 / 34 92.6 92 0.25 “A” / 0.004 “C” 1.46
Coeff Thermal Expansion (10-6)
25 – 400 C 3 / 3 0.6 / 0.4 n/a -2.3 / -0.7 3.0 / 0.4 1.5 / 0.2 4.1 / 3.4 n/a 4.8 x 10+6 n/a 93 x 10-7
400 – 800 C 2 / 1.4 1.1 / 0.8 n/a -2.5 / 1.1 2.5 / 0.1 1.2 / 0.4 5.6 / 4.3 n/a 5 x 10+6 0.001 “A” / 0.013 “C” n/a
800 – 1200 C 1.9 / 1.8 1.5 / 0.9 5.5 / 1 1.6 / 0.4 3.0 / 0.1 1.2 / 0.4 7.2 / 5.2 n/a n/a n/a n/a
1200  – 1600 C 5 / 4.8 2.8 / 2.7 n/a 0.9 / 0.3 n/a n/a 4.6 / 3.4 0.57 / 0.46 n/a 0.0025 “A” / 0.27 “C” n/a
1600  – 1900 C 7.2 / 6.1 n/a n/a 0.5 / 0.9 n/a n/a n/a n/a n/a n/a n/a
Specific heat at 25deg C  J/gK 8.60E-01 8.10E-01 n/a 0.81 0.77 0.76 0.64 1.5 n/a 0.2 cal/g* deg C n/a
Max Temp  oxidising / Inert 850 / 1200 850 / 1150C 850 / 1900 850 / 2000 1000 C + 1000 C + 850 / 1600 1020 / 1900 1000 / 1900 1900 800-1000

 

Electrical Properties

Dieletric constant a@ 1 Mhz 4.6 / 4.2 4.3 / 4 n/a 4 / 4 4.5 / 3.8 3.4 /3 3.7 n/a 7.1 6.8 “C” 3.7 6
Dissipation factor @ 1 Mhz 1.2E-03 / 3.4E-03 1.5E-03 / 2.1E-03 n/a 1.2E-03 / 3.0E-03 1.7E-03 / 6.7E-03 3.0E-03 / 3.1E-03 n/a n/a 10 x 10+4 n/a
Dielectric strength Kv/mm 88 >10 >70 79 66 >10 n/a 40 65 “C” 230 9.4
RT resistivity (ohm cm) >1013 >1014 >1013 >1013 n/a >1013 >1014 >1013 >1014 >1014 >1014 >1013 >1014 n/a 3.2 x 1010 1 x 1015 >1016

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