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Composition
Differences from Other Copper Alloys
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> CFA > Characteristics > Physical Characteristics
Physical Characteristics
Mechanical Characteristics Physical Characteristics


Shielding Effect of Electromagnetic Waves
      CFA has needle-shaped Fe, solid dissolved inside Cu, and forms Cu surface also inside CFA.
      Accordingly, if electromagnetic waves reach CFA, magnetic field caused by electric field
      –principle of the motor– and electric field caused by magnetic field –principle of the generator-
      are formed from the needle-shaped Fe and from Cu surface inside ; Magnetic field formed in the
      needle-shaped Fe acts as a lightning rod, absorbing ambient electric field, and electric and magne-
      tic fields have opposite directional nature, causing the “Hysteresis” phenomenon of Fe, and become
      extinct.
      This phenomenon is so momentary and continued repeatedly that it has perfect shielding effect.
      Especially, on high frequency with strong energy the shielding effect gets higher.
      Also the electric energy becomes extinct, not remaining, it has good arc-resistivity (no sparks).

● CFA 95 vs Japan “T” Company’s Material – Shielding Effect Comparison / 2015.01.29.


● CFA Shielding Effect Test Data


Spring Effect
      Beryllium Copper (BeCu) has been known to have the best spring effect and electric onductivity
      so far, but now is forbidden to use as, when remelted, it produces Be gas hazardous to human body.
      CFA has electric conductivity and spring effect to replace Beryllium Copper, and is made of Coppery
      and Iron onl that it is environmentally safe and can make products at lower costs than Beryllium Copper.

● Measurement of Mechanical Strength by Tensile Test
● Spring Effect: Mechanical Characteristics
Item Division Thick ness
(mm)
Compression Ratio
(%)
Hardness
(HV)
Allowable Bending
Stress (N/mm2)
Tensile Test
Horizontal Direction Vertical Direction Tensile Strength
Horizontal Direction)
(N/mm2)
0.2% Proof Stress
(N/mm2)
Elongation
(%)
Power Factor
(N/mm2)
CFA50       0.100 88.9 321 383 689 1,170 1,140 0.75 196700
CFA70       0.100 88.9 211 341 644 869 827 1.07 174300
CFA90-A       0.100 90.0 149 258 336 546 537 0.62 142600
CFA90-B       0.100 90.0 168 377 367 613 561 1.75 143400
CFA90-C       0.100 90.0 150 265 327 563 555 0.65 147600
CFA90-D       0.100 90.0 211 370 493 874 816 1.50 206800
CFA91.28 Original
Material
  0.100 - 165 - - 597 577 1.74 151500
Annealing   0.100 0.0 102 - - 378 222 18.44 -
Post-Process   0.100 70.0 186 - - 634 629 0.94 93800
CFA96 Original
Material
  0.100 - 159 300 316 566 545 3.37 129300
Eduction
Process
  0.100 - 157 284 293 553 543 2.31 131700

  Characteristics due to different contents of Cu-Fe   Characteristics
due to various treatments
(case hardening treatment)
  Characteristics
of Factory’s Rolling Conditions
  Additional Data 1   Additional Data 2



Electric Conductivity / Thermal Conductivity
      Copper has high electric conductivity and is a metal with excellent heat radiation.
      CFA is an epoch-making material that has copper’s high electric conductivity together
      with iron’s hardness (durability) as well.




● Comparison of Thermal Conductivity between CFA and Graphite