High conductivity high heat-resistant copper alloy
MZC1
C18140/C18141
- High-speed communication
Electrical conductivity, strength, and stress relaxation resistance are excellent.
It is used
for moving contacts in relays because of its high electrical conductivity, strength, and fatigue
resistance.
Positioning map
MZC 1 is a chromium · zirconium type copper alloy, and is a high strength · highly conductive type copper alloy which achieves both tensile strength of 600 MPa and conductivity of 80% IACS. As an industrial material, it is regarded as one of the copper alloy systems in a region which is closest to the ideal region. Even with its heat resistance, it has excellent characteristics and thus is suitably used under the harsh environments.
Main features
- Highest balance between conductivity and strength among copper alloys
- Excellent heat resistance and stress relaxation resistance characteristics
- Contributing to downsizing of electronic parts, lower heat generation, and higher reliability
- Possible to process reflow-Sn plating with excellent surface quality and whisker resistance
Chemical composition
(Weight %)
| Cr | Zr | Si | Cu |
|---|---|---|---|
| 0.25 | 0.1 | 0.02 | Rem. |
Technical Data
Physical properties
| Property | Representative Value |
|---|---|
| Specific Gravity (297K) |
8.9 |
| Coefficient of Thermal Expansion (×10-6/K : 293～573 K) |
17.1 |
| Thermal Conductivity (W/(m・K) : 293 K) |
H；316 SH；287 |
| Volume Resistivity (µΩm : 293 K) |
H；0.021 SH；0.023 |
| Electrical Conductivity (%IACS : 293 K) |
H；82 SH；74 |
| Modulus of Elasticity (kN/mm²: 293 K) |
137 |
Mechanical properties
The mechanical properties of MZC1 are as follows.
| Temper | Typical values | |||||
|---|---|---|---|---|---|---|
| 1/2H | H | SH | 1/2H t:0.15mm |
H t:0.15mm |
SH t:0.16mm |
|
| Tensile Strength (N/mm²) |
500～600 | 555～655 | 575～725 | 538 | 598 | 632 |
| 0.2% Yield Strength (N/mm²) |
－ | － | － | 502 | 567 | 611 |
| Elongation (%) |
6≦ | 3≦ | 2≦ | 16 | 14 | 13 |
| Elastic Limit※1 Kb0.1(N/mm²) |
_ | _ | _ | （471） | （528） | （559） |
| Vickers Hardness※2 (HV) |
（130～190） | （160～220） | （170≦） | （164） | （181） | （202） |
Stress relaxation resistance
MZC 1 also exhibits excellent stress relaxation resistance characteristics as compared with beryllium copper. Excellent properties can be exhibited in the stress relaxation resistance characteristics at 200°C.
Exposure temperature: 200℃
Sampling direction: Parallel to the rolling
direction
Bending stress: 80% of 0.2% yield strength
Bending workability
| Temper | Sampling Direction | Bending Inside Radius (mm) R | Evaluation R/ｔ | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (to the rolling direction) | 0.0 | 0.1 | 0.125 | 0.15 | 0.2 | 0.25 | 0.4 | 0.6 | 0.8 | 1.0 | ||
| H (Thickness：0.16mm) |
0° :(Good way) |
△ | △ | △ | △ | △ | △ | ○ | ○ | ◎ | ◎ | 0.00 |
| 90° :(Bad way) |
▲ | ▲ | ▲ | ▲ | ▲ | ▲ | ▲ | △ | ○ | ◎ | 3.75 | |
| SH (Thickness：0.16mm) |
0° :(Good way) |
▲ | △ | △ | △ | △ | △ | ○ | ○ | ◎ | ◎ | 0.63 |
| 90° :(Bad way) |
▲ | ▲ | ▲ | ▲ | ▲ | ▲ | ▲ | ▲ | ▲ | △ | 6.25 | |
Fatigue Property
MZC 1 has almost the same fatigue characteristics as those of beryllium copper. Of course, MZC 1 does not contain hazardous substances, and thus is recommended especially for people thinking about substitution from beryllium copper.
