Pyrolitic boron nitride. Physical and mechanical properties

PBN is very stable at high temperature:

• slow volatilization at 2073 K (under the vacuum or under inert atmosphere)
• melting temperature 3283 K (under nitrogen pressure)

Property		Type "A"	Type "C"
Density,103 kg/m3		1.85-2.24	1.85-2.24
Mass fraction,%	Boron	43.3-43.8	43.3-43.8
	Nitrogen	56.4-56.6	56.4-56.6
Total mass fraction of admixtures (Fe,Si,Cu,Mg,Al),%,maximum		5*10-3	5*10-3
Thermal coefficient of linear expansion within temperature range 293-1173K,10-6K-1		-1.5 - -2.0	20-42
Thermal conductivity, W/mxK, at 293 K		75-120	2.4-3.6
Resistance,Ohm*m		--	1*1015
Electric strength,kV/m		--	(45 - 100)*103
Dielectric permeability	at 106 Hz	4.8	3.9
	at 4*107 Hz	5.1	3.6
Tangent of dielecric loss angle	at 106Hz	1*10-1	--
	at 4*107 Hz	5*10-1	--
Modulus of elasticity,Gpa		25-120	7.4-13.2

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