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Search for a material with electrical resistance and high hardness
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Source：Internet Author：Unknow Pubdate：2010-03-20
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lgracio (Mechanical)
9 Mar 10 9:44
Please someone could help me search for a material with good properties of wear resistant or high hardness and simultaneously with electrical resistance features. This material is to be used as a tool disc to block and guide a fin strip plate and push it against tube where is to be welded with high frequency welding process, in that matter a reason to avoid electric current passing through the tool because it erodes the material regarding the effects of electrical fatigue.
The prevision of service conditions are:
Temperature = 40ºC up to 100ºC
Pressure = 40 Barg
I appreciate all your help on this. Thanks. Luís Grácio
Mechanical Engineer (Engineering Solutions)
Portugal-Setúbal
Ceramicguy (Materials)
18 Mar 10 17:09
字串7
If the ceramic is not near the welding heat, aluminum oxide is an excellent, low cost option. If the ceramic is immediately adjacent to the weld then a more thermal shock resistant material like silicon nitride can be used.
tomwalz (Materials)
18 Mar 10 19:17
Ceramicguy pretty well nailed it.
I have seen machines for brazing and welding where they use a standard machining insert. Easy to buy, relatively inexpensive and easy to replace. Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com
Good engineering starts with a Grainger Catalog.
Ceramicguy (Materials)
18 Mar 10 21:59
Tom makes a good point. Bonus, the inserts are available in aluminum oxide ceramic or silicon nitride. The silicon nitride ones are probably more available and are usually specified for turning cast irons.
字串7
Ceramicguy (Materials)
18 Mar 10 22:08
You can also use a sialon lathe tool insert. It is electrically insulating and wear resistant just like the aluminum oxide and the silicon nitride. It might be a little less expensive than the silicon nitride inserts. Bruce
www.accuratus.com
unclesyd (Materials)
18 Mar 10 23:44
Based on my experience I would start off with the best Sapphire and maybe later change to somethings else.
You haven't mentioned the configuration of your guides like vertical rods, parallel blades, doctor blades, rollers, etc.
If possible comeback with that information.
Here is the some general information on Sapphires.
http://www.photonic.saint-gobain.com/sapphire-materials.aspx
（Click：）
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