Amazing Properties of BNP 2 in High Vacuums

 As an economic alternative to Shapel M soft, BNP 2 can be machined to amazingly high precision in our workshop with application for high vacuums.

Machining BNP2

Machining BNP2

BNP2 is a composite ceramic that consist of sintered aluminium nitride together with boron nitride, BNP 2 has the advantages of a high mechanical strength together with significant thermal conductivity. It is essentially the same as the more expensive composite ceramic Shapal M soft and can be machined and treated in the same manner.

The key properties of BNP2 include a tolerance of high temperatures together with a very low thermal expansion. It has also a very low dielelectric loss, making it a suitable material for application in high vacuums.

It can be manufactured to a very high purity and also have a high flexural strength close to 30 kg/square metre. This is nearly five times the flexural strength of alumina.

The best materials for use in high vacuums are those that exhibit low outgassing – the release of trapped gas – as well as tolerating high temperatures. Such gases can seep out of cracks and fractures in the material as well as being the product of chemical reactions under high temperatures.

Such gases can condense on to components within the system in question and reduce their effectiveness. The gases may also be toxic if released into closed environments such as aircraft and spacecraft.

Typical materials that cause outgassing problems are paints, plastics and metals such as zinc and cadmium.

The most common material used in high-vacuum environments is austenitic stainless steel. Tantalum and molybdenum can be used for high-temperature applications. Borosilicate glasses can also be used in small applications such as windows and other viewing facilities.

The advantages of alumina ceramics such as BNP 2 is that they have no porosity as they are fully vitrified. They are very good thermal insulators and can be used up to temperatures of 1500 degrees C. In addition, the machinability of BNP 2 means that it can be made in complex shapes and also be fitted to join with metals.

This ceramic is also suitable for use as an insulator around processing equipment that is used in high-voltage environments.

Specific high-vacuum applications for such ceramics include high-temperature thermal seals, supports for metal coils and other components in any processing equipment within the system and feed-through channels in the vacuum system.

There are similar applications for BNP 2 in the aerospace sector such as hinge retaining rings and similar supports for doors and windows.

 

If you have any questions relating to BNP2 or any other kind of ceramic or Quartz materials ? please feel free to contact our technical sales manager jules.blain@multi-lab.co.uk

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