×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

joining of alumina

joining of alumina

joining of alumina

(OP)
What is the right way to join alumina to alumina?

Is brazing possible? Or welding? Diffusion welding?

Anything else?

RE: joining of alumina

You can epoxy, use active braze alloys or, sometimes, use standard braze alloys.

Tom

RE: joining of alumina

(OP)
Actually I would like to receive the most monolytic alumina possible.

Is there a way?

RE: joining of alumina

Yes, it is possible to braze ceramics together with more ceramics.  Typically called "fusing".  Tends to work better (i.e. achieve closer to monolithic stress capabilities), if done on higher purity aluminas.  It can be done on fired ceramics, or on green.

RE: joining of alumina

(OP)
What kind of material do I have to use? Where can I obtain the fusing material?

Alumina purities above 92%

Thanks in advance

RE: joining of alumina

I would guess that there are glass frits available for joining the aluminas/aslumina.

If you can tolerate a thin interface of a few thousandts of an inch of metal, the Moly-Manganese metalllizing process will give you as much as 9,000 psi tensile strength.  I can give most of the processing details if you are intereted.

Jesus is THE life,
Leonard

RE: joining of alumina

(OP)
Who delivers those glass frits?

I think that is the way to get a monolytic alumina, but I'm searching for information about it.

RE: joining of alumina

Can you describe the parts and the operating conditions (stresses, temperature, etc.)?

Yes, brazing is very doable.

RE: joining of alumina

(OP)
Temperature goes from 20 til 300 degrees.
the joined Alumina parts have to be gas tight.

The mean point is to get monolytic material.

RE: joining of alumina

You can try an active metal paste from Wesgo or Lucas Milhaupt. It will be a silver-based braze with titanium added (a few percent). You paint it on the mating faces. dry them, put them together in an graphite alignment fixture and heat the assembly in vacuum or argon to 900-950C. When the parts cool down, take them out. Your parts are brazed together.

RE: joining of alumina

JvdWal,
1)  By monolithic, I assumed you wanted the same material throughout (Alumina in this case).  But if you simply mean one contiguous piece then JimMetalsCeramics suggstion might simplest if it provides the properties you need.

2)  The Mo-Mn process mentioned in my June 27 post, will give you leak tightness of 1 x 10^-8 cc/year leak rate of Helium.  Also note the high tensile strength attained with the Mo-Mn process.

Jesus is THE life,
Leonard

RE: joining of alumina

(OP)
Thank you for your replies, Jimmetalsceramics and metman.

As said in your first point metman, I want the same material throughout for a semiconductor application. Metal may not be used in this application. What is possible

For an other application where leak tightness is important, sounds the Mo-Mn process interesting. I can tolerate a thin interface of a few thousandts of an inch of metal. Refering to your post June 27, wat are most of the processing details?

RE: joining of alumina

Mo-Mn is not necessary. You have two reasonable options;

-active metal brazing or,
-joining with a glass layer.

In either case, you apply a powder-filled ink to the joint and heat the parts together.

RE: joining of alumina

We brazed alot of Alumina to TZM

35/65 Copper Alloy in a Vacuum furnace

Wesgo is the company that sells brazing
alloy out of California. They also have a rep
in Milwaukee, Wisconsin.

If you need more info you can call me
at 312.777.4943

Andy

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close