Thermal Resistance of Heat Thermal Resistance of Heat Sink Interface Material Testing Sink Interface Material Testing

Device (TIM Tester)Device (TIM Tester)

Progress ReportProgress Report

3/8/20043/8/2004

Re-IntroductionRe-Introduction

Thermal interface materials (TIMs) fill gaps Thermal interface materials (TIMs) fill gaps between electronic devices and heat between electronic devices and heat sinks.sinks.

TIMs are now being designed with very TIMs are now being designed with very small thermal resistances.small thermal resistances.

Current standard does not test modern Current standard does not test modern TIMs with high certainty [1],[2].TIMs with high certainty [1],[2].

Re-IntroductionRe-Introduction

Team will design and build the structure, Team will design and build the structure, plumbing, and force application systems.plumbing, and force application systems.

Dr. Recktenwald and John Farley will Dr. Recktenwald and John Farley will design thermal data acquisition and data design thermal data acquisition and data reduction systems.reduction systems.

Product Design SpecificationsProduct Design Specifications

Supports the Transient MethodSupports the Transient Method

Test Several Types of TIMs Test Several Types of TIMs

Variable PressureVariable Pressure

Removable PucksRemovable Pucks

High Repeatability High Repeatability

Final Design ProgressFinal Design Progress

Overall concept has been establishedOverall concept has been established

Analysis of components and Assemblies Analysis of components and Assemblies has begunhas begun

Plumbing SystemPlumbing SystemHeater and Chiller with circulating loopsHeater and Chiller with circulating loops

Plumbing System ProgressPlumbing System Progress

Heater and Chiller are being researchedHeater and Chiller are being researched

Several possible valves have been Several possible valves have been identifiedidentified

Cross-Linked Polyethylene hose for the Cross-Linked Polyethylene hose for the pipespipes

Closed loop system including puck with Closed loop system including puck with cavitycavity

Force Actuator

Teflon Guide Rails

Load Cell

Aluminum Pucks

Alignment Alignment

RotationalRotational

Center on CenterCenter on Center

ParallelismParallelism

Aluminum PucksAluminum Pucks

Wet Puck

Dry Puck

Force ActuatorForce Actuator

RequirementsRequirements Up to 250 lbsUp to 250 lbs 12-24 Volts DC12-24 Volts DC 4-8 inches of stroke4-8 inches of stroke Low backlashLow backlash Not self-lockingNot self-locking Ball Screw DrivenBall Screw Driven

Force ActuatorForce Actuator

[3] http://www.duffnorton.com/emact.htm

Load CellLoad Cell

RequirementsRequirements

250 lbs250 lbs

Fits within puck guide railsFits within puck guide rails

As short as possible (column stability)As short as possible (column stability)

Compression OnlyCompression Only

Candidate Load CellCandidate Load Cell

Button type (load button)Button type (load button)

Compressive onlyCompressive only

250 lb capacity250 lb capacity

DimensionsDimensions Diameter = 1.25 inchesDiameter = 1.25 inches Height = 0.4 inchesHeight = 0.4 inches

Easily mountedEasily mounted

[4] www.TransducerTechniques.com

Force Actuator

Teflon Guide Rails

Load Cell

Aluminum Pucks

References

• [1] Kearns, Don, “Improving Accuracy and Flexibility of ASTM D 5470 for High Performance Thermal Interface Materials,” 19th IEEE SEMI-THERM Symposium, pg 129-33, 2003.

• [2] Lasance, Clemens J.M., Electronics Cooling, vol. 9, no. 4, 2003.

• [3] http://www.duffnorton.com/emact.htm, 3/8/2004.

• [4]http://www.transducertechniques.com/LBC-Load-Cell.cfm, 3/8/2004.