The current design is 100 turns and 30 Ampere, with a radius of 7cm. With the air core (without any metal core inside), the magnetic field is only 20-40 mT. I want to realize a magnetic field of 0.6T. I think the only choice I have is too use a metal core, which has a high permeability and saturation. The problem is where to purchase such material?
The metal core should be large, of radius around 7cm and length around 5cm. I purchased a 1018 steel rod from McMaster-Carr and it turned out this metal core is awful. The 1018 core has only doubled the magnetic field, far behind my expectation. I have checked the B-H curve of 1018, and if the curve if correct, with a H field of 20-40mT, the magnetization of the metal should be close to 2T. I'm confused!
Can anyone kindly tell me why the 1018 steel core doesnot work? And where should I purchase the metal core? Which material should I choose, pure iron, special alloy or silicon steel? Thank you very much!