Alumina ceramic mo mn vacuum interrupters metallized tube

The description of the metalized ceramics

Alumina ceramic is a versatile and highly durable material that is commonly used in a variety of

applications, including vacuum interrupters. Vacuum interrupters are essential components in electrical

circuit breakers, where they are used to safely interrupt the flow of electrical current when necessary.

 

In vacuum interrupters, alumina ceramic is often used to create the outer casing or tube that houses

the internal components of the interrupter. This ceramic material is chosen for its high electrical insulation

properties, as well as its ability to withstand high temperatures and mechanical stress.

 

The alumina ceramic tube used in vacuum interrupters is typically metallized in order to improve its electrical

conductivity. Metallization involves coating the surface of the ceramic with a thin layer of metal, such as

molybdenum (Mo) or manganese (Mn). This metallized layer helps to create a strong bond between the

ceramic and the metal components within the interrupter, ensuring reliable electrical connections.

 

The metallized tube also plays a crucial role in maintaining a high vacuum seal within the interrupter. By

creating a hermetic seal between the ceramic tube and other components, the metallized layer helps to

prevent air or other contaminants from entering the vacuum chamber. This is essential for ensuring the

proper functioning of the interrupter and preventing arcing or other electrical faults.

Standard types of the metalization
1. Alumina ceramic base +  silver (Ag) plating directly
2.Alumina ceramic base +  molybdenum (Mo/Mn) metallization
3.Alumina ceramic base +  molybdenum (Mo/Mn) metallization + nickel (Ni) plating
4. Alumina ceramic base + tungsten (W) metalization + gold (Au) plating 

The key parameters capability

Leak rate	≤1×10-11 Pa•m3 / s	Metal layer tensile strength	≥ 150Mpa
Volume Resistivity	≥108Ω•cm	CTE	(6.5 ~ 8.0) × 10-6 /°C
Insulation strength	≥18kV/mm (D•C)	Dielectric constant	9~10(1MHz, 20°C)
Cosmetic quality: 1. No cracks, no bubbles; 2. Evenly distributed glaze; 3. No contamination

The prime features of alumina metalized ceramics
1. High bonding/brazing strength with ideal vacuum tightness between the assembly
2. With diamond-like hardness to be 85 HRV and superb compressive strength 
3. Great insulation strength and volume resistivity that fit for various high voltage high current applications     
4. Chemical stability, anti-aging even if it works in a variety of harsh environments, free of rust forever.
5. Over 276 times wear resistance in comparison with stainless steel, leads to a long service lifespan.

Specification:

Item	99alumina	95alumina	92alumina	unit symbol
Bulk Density	3.85	3.65	3.6	g/cm3≥
Flexural Strength	350	300	280	MPa≥
Max Use Temperature	1700	1500	1400	°C≥
Volume Resistivity	1015	1014	1014	Ω·cm 20°C

 

 

 

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Do you accept customized production based our specification?
* Yes,we offer OEM and ODM service. Just send us your drawing if you have it. If you don’t have a drawing, just tell us your idea, we will work out the drawing for you.

 

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How to deal with the faulty?
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If there are problems with the product, we will provide free replacement.