ENGLISH
RUSSIAN
Thermoelectric elements
Since 1998 Crystal Ltd. has been producing thermoelectric elements of different cross-section and height. A unique technology allows growing the plates of thermoelectric material with defined width that forms one of the sizes of thermoelectric element (dice, pellet). It requires further only two cutting operations to form element's length and height. In result the elements have exact geometric dimensions.
An improved method of electro-erosive cutting technology is used to cut plates of thermoelectric material into elements with high accuracy of geometric dimensions and high quality of the surface after cutting.
Different types of coatings allow to use our elements for assembling of modules for various applications. We produce a wide range of thermoelectric elements. The elements of the standard size are used at our own modules mass-production factory. Crystal Ltd. offers the following series of elements practically for all types of thermoelectric modules used in special, industrial, automotive applications, and consumer products as well:
- For medium size thermoelectric modules (standard modules);
- For modules used in high temperature applications;
- For miniature and micro modules and special applications;
- For "High Power Density Modules";
- Elements accordingly to customer's special requirements.
All elements have the barrier antidiffusion coating fully compatible with RoHS requirements and modules assembling processes using lead-free solders.
THERMOELECTRIC ELEMENTS COATING TYPES
Type "6M"
The elements with this coating are used to assemble the modules for traditional cooling applications with operation temperature up to 90°C. A 140°C, 180°C melting point solder is recommended for the assembling process.
The coating composition:
| Nickel, Ni: | 4.0 ± 1.0 micron |
| Tin-Bismuth, Sn-Bi (Bi < 1 %): | 4.0 ± 1.0 micron |
Type "26"
The elements with this coating are used to assemble the modules for applications with operation temperature up to 110°C. The coating is applied by the magnetron for better uniformity and repeatability by orientation of metallization flow and applied metal layer thickness control. The antidiffusion Molybdenum sublayer protects the thermoelectric material from degradation of its electro-physical parameters. The preliminary etching of the working surface together with magnetron coating provides better density of metallization layer that also ensures repeatability of the coating adhesive strength. A 140°C, 180°C, 219°C, 232°C melting point solder is recommended for the assembling process.
The coating composition:
| Molybdenum, Mo: | 0.05 ± 0.02 micron |
| Nickel, Ni: | 4.0 ± 1.0 micron |
| Tin-Bismuth, Sn-Bi (Bi < 1 %): | 4.0 ± 1.0 micron |
Type "5B"
The elements with this coating are used to assemble the modules for applications with operation temperature up to 120°C and long-term "ON/OFF" operational mode. A 140°C, 180°C, 219°C, 232°C melting point solder is recommended for the assembling process.
The coating composition:
| Molybdenum, Mo: | 0.05 ± 0.02 micron |
| Nickel, Ni: | 5.0 ± 1.0 micron |
| Tin-Bismuth, Sn-Bi (Bi < 1 %): | 7.0 ± 1.0 micron |
Type "6B"
The elements with this coating are used to assemble the modules for cooling applications with operation temperature up to 150°C. A 140°C, 180°C, 219°C, 232°C melting point solders are recommended for the assembling process.
The coating composition:
| Molybdenum, Mo: | 0.05 ± 0.02 micron |
| Nickel, Ni: | 10.0 ± 1.0 micron |
| Tin-Bismuth, Sn-Bi (Bi < 1 %): | 7.0 ± 1.0 micron |
Crystal's range of standard elements size
| Length/Width, mm | Height, mm | Figure of merit, 103K-1, (in vacuum) |
Electric conductivity, Ohm-1cm-1, at 25°C |
| 0.4 | 0.5 | 3.00 |
850 900 950 1000 1050 |
| 0.4 | 0.8 | ||
| 0.45 | 1.27 | ||
| 0.5 | 0.7 | ||
| 0.5 | 1.0 | ||
| 0.5 | 1.5 | ||
| 0.52 | 1.6 | ||
| 0.54 | 0.76 | ||
| 0.61 | 1.27 | ||
| 0.61 | 1.52 | ||
| 0.635 | 1.02 | ||
| 0.65 | 1.0 | ||
| 0.65 | 1.27 | ||
| 0.81 | 1.27 | ||
| 0.81 | 1.57 | ||
| 0.85 | 0.46 | ||
| 0.85 | 1.27 | ||
| 0.85 | 1.57 | ||
| 1.0 | 0.46 | ||
| 1.0 | 0.64 | ||
| 1.0 | 1.27 | ||
| 1.0 | 1.3 | ||
| 1.0 | 1.57 | ||
| 1.0 | 1.65 | ||
| 1.0 | 2.03 | ||
| 1.2 | 1.4 | ||
| 1.2 | 1.91 | ||
| 1.36 | 0.64 | ||
| 1.36 | 1.52 | ||
| 1.36 | 1.57 | ||
| 1.36 | 2.41 | ||
| 1.4 | 0.4 | ||
| 1.4 | 0.8 |
Thermoelectric Elements Designation System
(used by Crystal Ltd.)
Example: TEE-1.0-1.6-3.00-950-6M
| TE | E | 1.0 | 1.6 | 3.00 | 950 | 6M |
|---|---|---|---|---|---|---|
| Thermoelectric Elements |
Conductivity Type N-type (E) or P-type (H) |
Elements cross-section, mm* |
Height of elements, mm* |
Figure of Merit** |
Electric Conductivity*** |
Coating Type |
* Tolerance ± 0.02 mm
** Figure of Merit measured in chains of 6 couples of n+p elements connected in series, measured by Harman's Method, x103K-1, in vacuum (control samples with dimensions A,B = 1.40 mm, H = 1.60 mm)
*** Ohm-1cm-1; standard tolerance ± 5%; reduced tolerance of ± 3% is available as additional option
Elements for Customer's Special Requirements
The elements can be made accordingly to customer's special requirements:
- Other dimensions of elements are available within ranges:
- Length — from 0.35 mm to 34.00 mm
- Width — from 0.35 mm to 2.40 mm
- Height — from 0.30 mm to 5.00 mm - Average electric conductivity value (for one batch) within range 850 - 1150 Ohm-1cm-1
- Elements with heightened Figure of Merit (Z) = 3.05
- Electric conductivity tolerance in one batch of elements can be ± 3%
- 100% appearance inspection
- Tolerance of every dimension ± 0.01 mm
- Elements with crystalline structure oriented parallel to chosen couple of edges (A x H) or (B x H)
- Elements with variable width
- Special design elements