This instrument mainly tests the thermal resistance of thin thermal conductors, thermally conductive silicone grease, thermal conductive resin, beryllium oxide porcelain, alumina porcelain and other fine materials, as well as the contact thermal resistance at the solid interface and the thermal conductivity of the material. The detection material is generally solid flakes, such as adding a frame to detect powder state materials and paste materials.

1. Overview

This instrument mainly tests the thermal resistance of thin thermal conductors, thermally conductive silicone grease, thermal conductive resin, beryllium oxide porcelain, alumina porcelain and other fine materials, as well as the contact thermal resistance at the solid interface and the thermal conductivity of the material. The detection material is generally solid flakes, such as adding a frame to detect powder state materials and paste materials.

Instrument reference standard: MIL-I-49456A (insulating sheet, thermal conductive resin, thermally conductive glass fiber reinforced); GB 5598-85 (Determination method for thermal conductivity of beryllium oxide porcelain); ASTM-D5470-12 (Test standard for heat transfer performance of thin thermally conductive solid electrical insulating materials), GB/T 29313-2017 "Test method for thermal conductivity of electrical insulation materials", etc.

The instrument has automatic pressurization, automatic thickness measurement, and full computer automatic measurement and control functions.

It is widely used in the thermal conductivity analysis and testing of materials in colleges and universities, scientific research units, quality inspection departments and production plants.

2. Main technical parameters

1. Pressure control module: The pressure driving rod drives the cold end module to move to press the specimen between the hot end modules, and maintain the set contact pressure conditions.

1.1 Pressure control range: 10 ~ 100 psi, soft materials should be used < 20 psi, hard materials should be used > 50 psi. Includes amplification circuit, digital display and RS-485 communication interface.

1.2 Pressure control mode: there are manual and computer automatic control, and the two modes can be switched.

1.3 Effective range of displacement travel: 0-12, high conductivity test, manual thickness measurement, maximum displacement measurement 40 mm. Maximum afterburner 1000N.

1.4 Three-point positioning device: make the cold end module and the hot end module accurately aligned, and adjust it manually when offset.

1.5 Parallel adjustment device: so that the two planes of contact between the cold end module and the hot end module can be closely adhered to, and when offset, it is manually adjusted.

1.6 After the test, the cold end module will not be automatically raised and must be set by manual operation.

2. Heating end module:

2.1 Test a set of hot ends, made of copper material.

a. Contact effective size: Diameter Ф30 mm.

b. Chrome plating and polishing on the surface.

After the process is completed, due to various tests before leaving the factory, the test material will have some micro-friction marks on the surface, such as small dents or tiny fine line marks, etc

2.2 There are three sets of precision temperature sensors on the test hot, which are used to measure the thermal power Qh and the surface temperature of the external hot-end Th, and the three groups of temperatures have digital displays and RS-485 communication interfaces, so that the relative temperature deviation is 0.1°C, not absolute values.

2.3 Heater module set:

a. Maximum heating power: 160 W (Ref.)

b. A DC power supply for heating 225W, connected to PC; Controlled by PC or manual command Heating power. c. Temperature protection switch.

d. The internal high temperature temperature of the hot end is heated with a built-in protection temperature of 180°C, and no external display is made.

2.4 The hot end is covered with foam insulation material on the outside, which will cause expansion and erosion in a long-term and high temperature state, and can be manually removed and supplemented.

2.5 Surface temperature control range of heating end module: 50~90°C,

3. Cold End Module:

3.1 Cold end module set, made of copper material.

a. Contact effective size: 30 mm in diameter, consistent with the shape of the hot end.

b. Surface nickel plating and polishing treatment.

After the process is completed, due to various tests before leaving the factory, the test material will have some micro-friction marks on the surface, such as small dents or tiny fine line marks, etc

3.2 There are 3 sets of precision temperature sensors on the cold end to measure the thermal power Qc and the surface degree of the external cold end Tc, and the three sets of temperature have digital display and RS-485 communication interface, so that the relative temperature deviation is 0.1°C, not absolute value.

3.3 A set of cooling modules, including:

a. A set of water-cooled coolers, connected to the cold end.

b. Cooling end temperature control range: 10 ~ 80°C, closed-loop temperature control.

c. Water-cooled structures, including:

c1. Circulating low-temperature constant temperature tank, volume 8L. c2. Heating device: including temperature display and control.

4. Thickness measurement module: measure in the form of external relative displacement relationship.

4.1 Three sets of displacement measurement units are arranged in 3 equal parts of the circumference, and the average value of the 3 displacement measurement values is used as the average thickness value.

4.2 Displacement accuracy 5μm, reading 1μm,

4.3 Effective measurement range of displacement: 3 mm

4.4 Three sets of displacement digital display and RS-485 communication interface.

4.5 The thickness measurement of hard specimens shall be measured externally with other measuring instruments (not included), and the thickness value shall be entered into the calculation parameter column.

4.6 Soft materials (Pad) were measured by three groups of LVDTs, and the average value was taken as the thickness. The measurement range is 0.5 ~ 3mm, and the thickness exceeds that is for reference only.

4.7 The measurement value of thermal paste thickness is for reference only and has no calculation significance.

4.8 It can be used for thermal resistance test of soft specimens under fixed thickness conditions. The minimum starting pressure of 10 psi can be controlled as the pressure of the starting thickness of the compressibility and thermal resistance test.

5. Computerized control, data capture and analysis output.

5.1 Control in PC Based state, including two independent control variables

a. Contact pressure control.

b. Th surface temperature control.

5.2 Data capture and analysis output: special software, free upgrade.

5.3 PC devices: including legal operating systems, Excel software.