Our components made of pyrolytic boron nitride or graphite which are manufactured by means of the CVD process possess numerous properties which offer our customers the decisive added value:
- In ultra-high vacuum applications, our crucibles made of pyrolytic boron nitride or graphite are distinguished through minimal outgassing at the highest temperatures.
- No effect on the chemical reactions or the physical properties of the products can be measured.
- Depending on the required construction type, the components made of pyrolytic boron nitride or graphite are very flexible and yet stable in form.
Crucibles made of pyrolytic boron nitride
CVT are able to manufacture crucibles made of pyrolytic boron nitride in different sizes and forms.
Depending on the customer’s requirements, we manufacture individual parts or large quantities – always on time and on attractive terms.
We can produce the following types of crucibles and free-standing forms:
- straight crucibles
- conical crucibles
- special forms
Using the Chemical Vapour Deposition process we can coat suitable graphite materials with pyrolytic boron nitride and so combine the thermally and chemically stable and electrically insulating properties of the anisotropic PBN with the electrical conductivity of graphite.
This means that thicker components such as heaters, melting tanks and boats can also be manufactured. The positive properties of the two materials are combined.
Since, due to their comparable CTE (coefficient of thermal expansion), pyrolytic boron nitride and pyrolytic graphite can be combined in layers, they can be used to construct heater elements. The low mass and the associated good, rapid temperature change behaviour should be emphasised here, along with the chemical inertness in relation to other substances.
The heaters can be manufactured in the form of flat heaters or 3D heaters such as tubes. Our heaters are all designed and manufactured to customers’ specifications.
Components made of pyrolytic graphite
CVT also offer a wide variety of components and products made of pyrolytic graphite, which is also produced with the aid of the CVD process. Components are either manufactured from sheet material using conventional processing methods or, as with PBN, they are produced “directly” by depositing pyrolytic graphite on the surface of preforms. In this case the products are again crucibles or coatings.