项目Item/类别Grade

BNH

BNC

BNP

BN纯度Purity

>99.5%

复合composite

>96

密度/Density

1.9±0.5

2.95

2.0

**工作温度/Max operating
Temperature

850 in atmosphere

1000℃

850℃

2200 in inert gas

2000℃

1150-1800℃

硬度/Hardness

4

105

16

屈服强度/flexural strength

3000Psi

21000Psi

9800Psi

热传导率/Heat conductivity

63W/mk

38

55

热膨胀率/coefficient thermal expansion

0.6(x10-6/K)
RT-1500℃

3.5(x10-6/K)
RT-1500℃

4.0(x10-6/K)
RT-1500℃

体积电阻/volume resistance

>1015(Ωcm)

-

>1015(Ωcm)

Composite

Oxygen(%)

<0.4

<14

<2.0

Carbon

0.02

2.0

0.02