-- The Home Page of the Finishing Industry
23+ years of serious education, promoting Aloha,
& the most fun you can have in metal finishing smiley
    no popups, no spam
on this site
current topics
topic 7640

Corrosion Resistant Light Absorber (Selenium Atmosphere)



In a reaction chamber I want to heat a small glass substrate by a radiation heater (3000 K color temperature). For temperature homogeneity and light absorption I want to mount the substrate on a highly conductive absorber plate. The natural choice for material would be copper, but:

1. The substrate shall be heated to 850 K at > 20 K/s, therefore I need the best possible absorption -> blackening finish that can stand thermal stress?
2. The chamber will work in vacuum (-> no outgassing surfaces) as well as in selenium atmosphere. Selenium is highly corrosive for copper (and nearly any other material, best would be molybdenum or ceramics)! -> Surface finish should be corrosion resistant.

The choice of copper as absorber material was my first idea, another possibility would perhaps be Aluminium nitride. Any idea on blackening of AlN? By the way: Aluminium can not be used, it reacts with Se and air humidity to highly toxic Selenium hydride.

Patrick B [last name deleted for privacy by Editor]
- Erlangen, Germany

March 16, 2009

Hi Patrik. We are working on the same problem -- selenium resistant material -- and I am curious if you have any answer by now?

Alfred Spitzenberger
- Linz, Austria

March 17, 2009

Hi, Alfred. Patrick's question is old, and I'm not sure why it did not attract some answers. Regardless, be assured that many people view this thread every month, and you can certainly be of help to them, and they will hopefully be of help to you. Good luck.


Ted Mooney, Teds signature
Ted Mooney, P.E.
Pine Beach, New Jersey

This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Comment to THIS thread START a NEW threadView CURRENT TOPICS

Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices

©1995-2018, Inc., Pine Beach, NJ   -   About   -  Privacy Policy
How Google uses data when you visit this site.