Products Description

The Boron Nitride Ceramic Sealing Ring is a high-performance sealing component made from advanced boron nitride ceramic material. This material, often referred to as "white graphite," is a synthetic ceramic known for exceptional thermal stability, chemical inertness, and lubricity. Sealing rings are commonly fabricated from hot pressed boron nitride (HBN) or premium grades like Momentive boron nitride, which provide a balance of strength and machinability. For the most extreme purity and performance in vacuum or semiconductor environments, rings may also utilize pyrolytic boron nitride (PBN) or feature a PBN coating. This unique combination of properties makes ceramic boron nitride ideal for demanding sealing applications in extreme environments where conventional materials fail.

Boron Nitride Ceramic Sealing Ring

Product name	Boron nitride vacuum gasket
Color	Customized according to the client's requirements
size	Customized according to the client's requirements
Packaging	Carton /Pallet/Wooden case (According to client requirement )
Delivery time	Standard Product-Within 3 days
Items Design	According to the client's drawing or samples
Features	Good quality, low price, Multiple factories, deliver to you based on the one closest to your location
Application	Industrial Ceramics
Certificate	ISO, CE

Ceramics performance parameter

Number	Performance	Unit	Boron nitride	Boron nitride	Boron nitride
			Boron nitride	Boron nitride	Boron nitride
			BN99.9%	BN99.7%	BN99.5%
1	Density	g/cm3		1.6	1.9
2	Flexural strength	MPa	94~95	20	35
3	Fracture toughness	MPa·m1/2		8	11~14
4	Dielectric constant	εr(20℃,1MHz)	4.37	1.9~3.8	1.9~3.8
5	Hardness	GPa	1.15	2	4
	Hardness	HRC		35	40
6	Volume resistivity	Ω·cm(20℃)		10 14	10 14
7	Elastic modulus	GPa	29.4
8	Coefficient of thermal expansion	×10-6/k		1`1.5	0.6(x10-6/K) RT-1500℃
9	Compressive strength	MPa	118~120	30	30
10	Abrasions	g/cm2		0.3	0.3
11	Thermal conductivity	W/m×k(20℃)		35	63~75W/mk
12	Poisson's ratio	/		0.5	0.5
13	Insulation strength	kv/mm		28	28
14	Temperature	℃	1000 in air/2200 in inert atmosphere	1000 in air/2200 in inert atmosphere	850 in air/2200 in inert atmosphere

Product Performance

Boron nitride ceramic sealing rings exhibit outstanding performance, largely defined by their unique crystal structure. They possess excellent thermal shock resistance and their high boron nitride thermal conductivity (a key parameter often discussed as BN thermal conductivity or the thermal conductivity of boron nitride) facilitates rapid heat dissipation from the sealing interface. Specifically, the hexagonal boron nitride thermal conductivity (hBN thermal conductivity) is highly anisotropic, which can be engineered in components. They are excellent electrical boron nitride insulators and maintain properties at high temperatures. Their remarkable chemical resistance and self-lubricating nature reduce friction and wear. Furthermore, machinable boron nitride grades allow for the precision boron nitride machining of complex sealing geometries.

Products Applications

These sealing rings are used in severe-service applications. Common uses include: high-temperature and vacuum furnaces (often employing PBN or nitrure de bore pyrolytique components); pumps and valves handling corrosive chemicals; semiconductor manufacturing (MOCVD, crystal growth) where pyrolytic boron nitride PBN crucibles and coatings are standard; aerospace and advanced engines; and metallurgy for handling molten metals. The utility of boron nitride ceramics extends beyond rings to boron nitride sheets, BN sheets, boron nitride ceramic sheets, and boron nitride plates used as insulators, shrouds, and components in these same industries, leveraging the material's boron nitride conductivity (thermal) and isolation (electrical) properties.