Link to Standard Products Link to Custom Products Link to Case Studies Link to Ceramic and Glass Materials Link to Design Notes Link to Working Together Link to Accuratus Contact Form
link to Accuratus home page

,
Materials

 

Accuflect®

Aluminum Nitride

Aluminum Oxide

Boron Nitride

Fused Silica

Macor®

Mullite

Sialon

Silicon Carbide

Silicon Nitride

Zirconium Oxide

 

 

Boron Nitride, BN Ceramic Properties

Boron nitride is a white solid material in the as produced hot pressed form. It is a low porosity solid. It is easily machined into complex shapes using standard carbide tooling. The material is anisotropic in its electrical and mechanical properties due to the platy hexagonal crystals and their orientation during the hot press consolidation.

.Key Boron Nitride Properties

check High thermal conductivity
check Low thermal expansion
check Good thermal shock resistance
check High electrical resistance
check Low dielectric constant and loss tangent
check Microwave transparency
check Non toxic
check Easily machined — non abrasive and lubricious
check Chemically inert
check Not wet by most molten metals

Typical Boron Nitride Uses

check Electronic parts — heat sinks, substrates, coil forms, prototypes
check Boron doping wafers in silicon semiconductor processing
check Vacuum melting crucibles
check CVD crucibles
check Microcircuit packaging
check Sputtering targets
check High precision sealing, brazing, and metallizing fixtures
check Microwave tubes
check Horizontal caster break rings
check Low friction seals
check Plasma arc insulators
check High temperature furnace fixtures and supports

General Boron Nitride Information

Boron nitride is often referred to as “white graphite” because it is a lubricious material with the same platy hexagonal structure as carbon graphite. Unlike graphite, BN is a very good electrical insulator. It offers very high thermal conductivity and good thermal shock resistance. BN is stable in inert and reducing atmospheres up to 2000°C, and in oxidizing atmospheres to 850°C.

Three grades are commonly used, including a boric oxide binder system, a calcium borate binder system, and a pure diffusion bonded grade. The boric oxide containing material (Grade BO) absorbs moisture which causes swelling and property degradation. The calcium borate containing material (Grade CA) is moisture resistant. The pure BN material (Grade XP) contains no binders and is used for extremes of temperature and where purity is important. The boric oxide material is the most commonly used grade.

Download Boron Nitride grade BO datasheet

Boron Nitride Engineering Properties*

Boron Nitride, Grade BO


Units of Measure

Orientation to Pressing Direction

Mechanical

SI/Metric (Imperial)

Parallel

Perpendicular

Density

gm/cc (lb/ft3)

1.9

(120)

1.9

(120)

Porosity

% (%)

2.8

2.8

2.8

2.8

Color

white

white

white

white

Flexural Strength

MPa (lb/in2x103)

75.8

(11.0)

113

(16.4)

Elastic Modulus

GPa (lb/in2x106)

46.9

(6.8)

73.8

(10.7)

Shear Modulus

GPa (lb/in2x106)

Bulk Modulus

GPa (lb/in2x106)

Poisson’s Ratio

Compressive Strength

MPa (lb/in2x103)

143

(20.8)

186

(27.0)

Hardness

Kg/mm2

15-24

15-24

Fracture Toughness KIC

MPa•m3/2

Maximum Use Temperature
(inert atm)

°C (°F)

1200

(2190)

Thermal






Thermal Conductivity

W/m•°K (BTU•in/ft2•hr•°F)

30

(205)

33

(225)

Coefficient
of Thermal Expansion

10–6/°C (10–6/°F)

11.9

(6.6)

3.1

(1.7)

Specific Heat

J/Kg•°K (Btu/lb•°F)

1610

(.38)

Electrical






Dielectric Strength

ac-kv/mm (volts/mil)

95

(2400)

79

(2000)

Dielectric Constant

@ 8.8 GHz

4.6

4.2

Dissipation Factor

@ 8.8 GHz

0.0017

0.0005

Loss Tangent

Volume Resistivity

ohm•cm

>1014

>1015

 

Boron Nitride, Grade CA


Units of Measure

Orientation to Pressing Direction

Mechanical

SI/Metric (Imperial)

Parallel

Perpendicular

Density

gm/cc (lb/ft3)

1.9

(120)

1.9

(120)

Porosity

% (%)

15

15

15

15

Color

white

white

Flexural Strength

MPa (lb/in2x103)

43.4

(6.3)

60

(8.7)

Elastic Modulus

GPa (lb/in2x106)

33.8

(4.9)

75

(10.9)

Shear Modulus

GPa (lb/in2x106)

Bulk Modulus

GPa (lb/in2x106)

Poisson’s Ratio

Compressive Strength

MPa (lb/in2x103)

30

(4.4)

44.5

(6.5)

Hardness

Kg/mm2

14-18

14-18

Fracture Toughness KIC

MPa•m1/2

Maximum Use Temperature
(inert atm)

°C (°F)

1150

(2100)

Thermal






Thermal Conductivity

W/m°K (BTU•in/ft2•hr•°F)

27

(187)

31

(215)

Coefficient
of Thermal Expansion

10–6/°C (10–6/°F)

2.95

(1.6)

.87

(.5)

Specific Heat

J/Kg•°K (Btu/lb•°F)

1470

.35

Electrical






Dielectric Strength

ac-kv/mm (volts/mil)

67

(1700)

Dielectric Constant

@ 8.8 GHz

4.3

4

Dissipation Factor

@ 8.8 GHz

0.0014

0.0007

Loss Tangent

Volume Resistivity

ohm•cm

>1014

>1014

 

Boron Nitride, Grade XP


Units of Measure

Orientation to Pressing Direction

Mechanical

SI/Metric (Imperial)

Parallel

Perpendicular

Density

gm/cc (lb/ft3)

1.9

(120)

1.9

(120)

Porosity

% (%)

14

14

14

14

Color

white

white

white

white

Flexural Strength

MPa (lb/in2x103)

13.8

(2)

21.4

(3.1)

Elastic Modulus

GPa (lb/in2x106)

14

(2)

Shear Modulus

GPa (lb/in2x106)

Bulk Modulus

GPa (lb/in2x106)

Poisson’s Ratio

Compressive Strength

MPa (lb/in2x103)

18

(2.6)

23.4

(3.4)

Hardness

Kg/mm2

3-5

3-5

Fracture Toughness KIC

MPa•m1/2

Maximum Use Temperature
(inert atm)

°C (°F)

2000

(3630)

Thermal






Thermal Conductivity

W/m•°K (BTU•in/ft2•hr•°F)

71

(490)

121

(840)

Coefficient
of Thermal Expansion

10–6/°C (10–6/°F)

0.6

(.33)

.46

(.25)

Specific Heat

J/Kg•°K (Btu/lb•°F)

1470

(.36)

Electrical






Dielectric Strength

ac-kv/mm (volts/mil)

80

(2000)

80

(2000)

Dielectric Constant

@ 8.8 GHz

4

4

Dissipation Factor

@ 8.8 GHz

0.0012

0.0003

Loss Tangent

Volume Resistivity

ohm•cm

>1014

>1014

*All properties are room temperature values except as noted.
The data presented is typical of commercially available material and is offered for comparative purposes only. The information is not to be interpreted as absolute material properties nor does it constitute a representation or warranty for which we assume legal liability. User shall determine suitability of the material for the intended use and assumes all risk and liability whatsoever in connection therewith.

Back to top

Standard Products | Custom Products and Services | Case Studies | Materials
Design Notes | Working Together | Vision | Contact Us
| Site Map

1-908-213-7070

© 2013 Accuratus

Site Design M. Adams