Silicon Nitride Ceramic blocks, tiles, plates, etc

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Application of silicon nitride guide roller in casting industry

Compared with metal guide roller and alloy guide roller, silicon nitride guide roller has more advantages in high temperature resistance, high hardness, high toughness, impact resistance and oxidation resistance; At the same time, the silicon nitride guide roller is oil-free, self-lubricating, low density, light weight, and its service life is more than ten times that of the alloy guide roller.

Silicon nitride (Si3N4) high thermal conductivity substrate

High thermal conductivity silicon nitride ceramic substrate

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Features

►High strength: Bending strength is about twice that of AL2O3 and ALN substrates.
►High thermal conductivity: It is more than 3 times higher than AL2O3 substrate.
►Light and thin: its thickness can reach 1/2 of AlN substrate
►Excellent thermal shock resistance: its thermal expansion coefficient is close to that of silicon.

Item		Unit	Al2O3	AIN	Si3N4
Density		g/cm2	3.75	3.3	3.22
Thickness		mm	0.3175~1.0	0.4~2.5	0.238~0.635
Surface roughness level (Ra)		μm	0.4	0.2	0.4
Mechanical properties	bending strength	Mpa	310~400	300~450	650
	Young's modulus	Gpa	330	320	310
	Vickers hardness	Gpa	14	11	15
	fracture toughness	Mpa.ml/2	3~4	2~4	5~7
	Thermal expansion coefficient	10 -6/K	7.1~8.1	4.5~4.6	2.6
	Thermal conductivity	W/(m.K)	20~30	160~255	60~120
	Specific heat	J/(kg/K)	750	720	680
Electrical characteristics	Dielectric constant	/	9~10	8~9	7~9
	Dielectric loss tangent	...10-3	0.2	0.3	0.4
	Volume resistivity	Ω.m	＞1012	＞1012	＞1012
	Breakdown voltage	kv/mm	＞12	＞14	＞14