Comparison table:
| Properties |
ELECTROLESS NICKEL WITH % PHOSPHOROUS: |
Nickel Teflon |
Electrolytic Nickel |
Hard chrome |
| LOW % P |
MEDIUM % P |
HIGH % P |
% phosphorous (weight) |
2-4 |
5-7 |
10,5-12 |
9-11 |
--- |
--- |
% PTFE (weight) |
--- |
--- |
--- |
8-9 |
--- |
--- |
| % PTFE ( Volume) |
--- |
--- |
--- |
20-25% |
--- |
--- |
| Structure |
Crystal |
Mixed: Crystal and amorphous |
Amorphous |
Amorphous |
Crystal |
Crystal |
| Appearance |
Very bright |
Bright |
Semi-Bright |
Mat grey |
Very bright |
Very bright |
| Deposition rate (µ/hour) |
18-22 |
17-20 |
10-12 |
6-9 |
48-50 |
60 |
Vickers hardness
Vicker |
Without heat treatment |
700 |
600 |
530 |
350 |
200 |
1000 |
| With heat treatment |
960 |
1000 |
1050 |
450 |
N/A |
N/A |
| Corrosion resistance. Salt fog chamber test. |
24 |
96 |
1000 |
1000 |
24 |
<24 |
| Magnetic properties |
Magnetic |
Slightly magnetic |
Non magnetic |
Non magnetic |
Magnetic |
ND |
Permeability
|
130 |
1,4 |
0 |
0 |
70 |
--- |
| Friction coefficient |
0,40 |
0,40 |
0,4 |
< 0,11 |
ND |
0,43 |
| Weldability |
Good |
--- |
--- |
--- |
--- |
--- |
| Internal stresses (Mpa) |
-10 |
40 |
-20 |
--- |
120 |
200 |
| Melting point ( ºC) |
1275 |
1000 |
880 |
ND |
1450 |
1890 |
| Density ( gr./cm3) |
8,6 |
8,1 |
7,8 |
ND |
8,9 |
7,1 |
| Thermal expansion coefficient ( µ/m/ºC) |
12,4 |
13 |
12 |
ND |
14 |
8,4 |
Electrical resistivity
( micro-ohm/cm.) |
30 |
75 |
100 |
ND |
10 |
40 |
Thermal conductivity
( W/cm.K) |
0,6 |
0,05 |
0,08 |
ND |
0,95 |
0,67 |
Specific heat
(cal./gK)
|
0,25 |
ND |
0,11 |
ND |
0,11 |
0,11 |
| Ultimate tensile strength ( Mpa) |
300 |
900 |
800 |
ND |
400 |
120 |
| Ductility |
0,7% |
0,7% |
1,5% |
ND |
18% |
0,1% |
Modulus of elasticity (Gpa)
|
130 |
110 |
170 |
ND |
180 |
120 |
| Taber Index * |
Without heat treatmen |
11 |
16 |
19 |
N/A |
25 |
2 |
With heat treatmen |
9 |
12 |
12 |
N/A |
N/A |
N/A |
ND: Not determined
N/A: Not applicable.
* Weight loss in mgr per thousand cycles.
| WEAR COMPARISON TABLE |
| Coating rubbing a steel shaft |
Wear rate (m3/Nm) |
Friction coefficient |
| Nickel Teflon/Steel |
3x10-15 |
0,10-0,07 |
| Electroless Nickel/Steel |
3,4x10-13 |
0,38-0,21 |
| Hard Chrome/Steel |
6,9x10-14 |
0,21-0,15 |
| Steel/Steel |
5,5x10-12 |
0,48-0,30 |
REMARKS:
- The above data have been submitted by ENTHONE España, S.A.
- They are theoretical data that could vary as a function of material and thickness.
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