Ceramics to steel
Ceramics to steel
(OP)
Hi,
I need to insert a ceramic (Alumina, Zirconia) inside of a steel housing. The piece is cylindrical.
I have done some reading about brazing, and this is an option, but I am wondering if there are other ways of accomplishing this?
Thank you.
I need to insert a ceramic (Alumina, Zirconia) inside of a steel housing. The piece is cylindrical.
I have done some reading about brazing, and this is an option, but I am wondering if there are other ways of accomplishing this?
Thank you.





RE: Ceramics to steel
What sizes are you talking about?
what specific materials are you using?
What temperature will the part see?
With CS I'm assuming under 750F.
Depending on this information there may be several approaches to bonding/attaching the ceramic to the steel. There are numerous adhesives both organic and inorganic that could possibly fill your needs.
RE: Ceramics to steel
pressure fit - possible but tricky
Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com
Good engineering starts with a Grainger Catalog.
RE: Ceramics to steel
Chocolates,men,coffee: are somethings liked better rich!!
(noticed in a coffee shop)
RE: Ceramics to steel
The temperature will be in the range of -40 - 180degC.
The material of the steel housing could either be Duplex or Inconel, maybe 625...
Let's say that the Zirconia or Alumina part is cylindrical shape with diameter of about 40mm, and that the steel housing is 60mm in diameter.
Just think of the housing as a piece of tube with the Zirconia cylindre inserted.
How would you go about brazing this part? Insert Zirconia cylindre into tube and just braze the thing?
I have never done brazing.
Thank you.
RE: Ceramics to steel
The trick with ceramics is to keep them continuously in compression. Consider heating the outer sheath metal and shrinking it onto the ceramic core.
RE: Ceramics to steel
http://www.cotronics.com/vo/cotr/ca_1.htm
{like high temp ceramic loctite)
RE: Ceramics to steel
Brazing will have the added advantage of providing cushioning between the steel and the ceramic as the part shrinks in the cold.
We do this regularly see:
htt
There are braze alloys that work but they require exotic metals and special atmospheres.
Tom
Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com
Good engineering starts with a Grainger Catalog.
RE: Ceramics to steel
Chocolates,men,coffee: are somethings liked better rich!!
(noticed in a coffee shop)
RE: Ceramics to steel
If this is a one off I definately would look to someone well versed in the art if you indeed need it to be brazed.
Why the high Nickle Alloys?
What type of load is going to be placed on the ceramic part.
RE: Ceramics to steel
RE: Ceramics to steel
Tom
Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com
Good engineering starts with a Grainger Catalog.
RE: Ceramics to steel
I should have mentioned that this system will be exposed to rather high pressures, up to 15ksi. But I do not see this as the biggest issue, since the brazing will not have to carry any load.
I might be able to use Duplex instead of Inconel. The reason for these materials is that there might be a lot of H2S present. And in addition they love these materials in the oil business..
About ceramics being continuously under compression, would you mind explaining why this is so?
I will definitely look into it. Thanks.
Thank you for the link, very informative site. Impressive.
Is this done to get a better brazing, or is there some other reason?
Again, thank you very much for your time.
RE: Ceramics to steel
RE: Ceramics to steel
Thank you for the kind words. Pretty good way to start the day.
I think you can also braze to the tungsten. We don't see any difference in bond strength between lower binder materials and high binder materials. However our only real test is that they all work so the testing is not at all exhaustive in this area. Also a properly prepared piece of tungsten carbide has a tremendous surface area which aids in the physical joining and may compensate for weaker intermetallic joining.
We actually braze to the titanium in selected Aluminas using standard Bag braze alloys using a water based metallizing (plating) process. For straight Alumina we use special alloys and vacuum.
Tom
Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com
Good engineering starts with a Grainger Catalog.