Thermal Conductivity vs. Hardness
Thermal Conductivity vs. Hardness
(OP)
I'm looking for a material that has a thermal conductivity higher than that of aluminum with a hardness comparable to cold-rolled steel. Can aluminum be treated to reach such rigidity? Are there any copper alloys that may work? The material will go into a work piece that periodically sustains 1/2 ton of pressure (for 1 sec.) at 800 deg F. Any recommended resources?





RE: Thermal Conductivity vs. Hardness
Try doing a search on Mat-Web using the property requirements..
I think that a CuBe etc. alloy might give you what you need...
nick
RE: Thermal Conductivity vs. Hardness
You might be able to use one of the Ampco metals. I don't have their brochure anymore so I can’t look up the physical properties of their materials..
www.ampcometals.com
www.copper.org
This site will give you the physicals of the families of materials.
RE: Thermal Conductivity vs. Hardness
RE: Thermal Conductivity vs. Hardness
Your part is probably not annealing as its not very hard to begin with. It probably just deforming from use as C/S doesn't have much strength at your temperature.
Unless your cold roll steel is hardenable by heat treating the answer is that nothing can be done to it. It could possibly be case hardened to help out, but I would go with my suggestion to change steels.
RE: Thermal Conductivity vs. Hardness
Maui
RE: Thermal Conductivity vs. Hardness
RE: Thermal Conductivity vs. Hardness
The machinability of H13 is a strong function of its hardness. In the annealed condition it is readily machined using standard practices including milling, drilling, and single point turning. In the heat treated condition it is much more difficult to machine due to its increased hardness. The maximum attainable hardness for this through-hardening grade of steel is about 53 Rockwell C, but in application it is normally used in the 40-48 HRC range. It can be surface finished to a high tolerance especially in the hardened condition, and provides a good balance of toughness, heat check resistance, and high temperature strength. It possesses only moderate wear resistance. Does this answer your question?
Maui
RE: Thermal Conductivity vs. Hardness
Very good. I think I'm close to understanding it. So if I chose to rework the cold-rolled piece, shot peening would be a better option than case hardening. Correct? So is case hardening simply impossible for cold-rolled steel, or just not very effective? Will the surface not absorb carbon during treatment? Your input has been very valuable for me. -aspearin1
RE: Thermal Conductivity vs. Hardness
I would recommend that you consider a material substitution with a through-hardening grade of steel that would be appropriate for this application. Keep in mind the precautions that I mentioned in my prior posts regarding toughness and wear resistance.
Maui
RE: Thermal Conductivity vs. Hardness
This will definately cost more but you will have several benifits:
1. the H13 part will retain their properties over much longer times... possibly as long as you could ever want..
2. Results will be much more consistant.
nick
RE: Thermal Conductivity vs. Hardness
Are these components insert blades?
If they are an insert, you might want to try feeler gauge stock.
http://www.precisionbrand.com/default.as...
It is already heat treated to 50-55 Rc and relatively cheap.
Almost any thing you do ti .010" material is going to warp it.
RE: Thermal Conductivity vs. Hardness
Your are going to have to use a through hardened material.
Are these components insert blades?
If they are an insert, you might want to try feeler gauge stock.
http://www.precisionbrand.com
It is already heat treated to 50-55 Rc and relatively cheap.
There is another material, reed valve springs, that is also very hard and tough.
The industrial knife and blade people alos make blades in your size range. We used a .012 3/4" x 6" blades in some very rough duty.
http://www.knives-ez.com/knives/0005051
This is a good starting point.
RE: Thermal Conductivity vs. Hardness
RE: Thermal Conductivity vs. Hardness