Basic Properties and Application Examples of PGS Graphite Sheet
Transcription
Basic Properties and Application Examples of PGS Graphite Sheet
Basic Properties and Application Examples of PGS Graphite Sheet PGS Graphite Sheet 1. 2. 3. Basic properties of PGS Graphite sheet Functions of PGS Graphite sheet Application Examples Presentation [Sales Liaison] Panasonic Electronic Devices Co., Ltd. Capacitor Business Unit PM Group Goods Team PGS Contact Direct Line (0774)31-7366 [For inquiries of technology issues] Panasonic Electronic Devices Japan Co., Ltd. Ceramic Division Engineering Team4 PGS Contact Direct Line (0123)23-8149 PGS Graphite Sheet PGS Graphite Sheet PGS (Pyrolytic Highly Oriented Graphite Sheet) is made of graphite with a structure that is close to a single crystal, which is achieved by the heat decomposition of polymeric film. PGS is a competitive conductive sheet with high thermal conductivity and high flexibility. High heat conductivity: Each material has high heat conductivity. PGS Graphite Sheet:C99.9% or more Heat conductivity of each material (a-b plane) PGS 25µ PGS 70µ PGS 100µ Pure copper [Layered Structure ] Aluminum 3.354~3.356 x 10-8cm Magnesium alloy Stainless steel Heat conductive sheet c axis 0 200 400 600 800 1000 1200 Heat conductivity (W/[m/K]) a-b plane 1400 1600 Flexibility of PGS Graphite Sheet PGS Graphite Sheet [Bending Test] [Bending Limitation] Bending Radius( R ) The sheet is fixed < 0.98N > Bending Angle PGS Graphite Sheet 90 degrees Bend Radius: R 180 degrees R =2(mm) R =5(mm) 10,000 cycls 100,000 cycls or more or more 3,000 cycls or more 30,000 cycls or more Bending Angle 180 degrees 90 degrees Flexibility: PGS is bending-resistant due to its flexibility. PGS can be used for areas such as curved surfaces and corners because its heat conductivity will remain unchanged in the absence of folds in PGS. Material Characteristics of Graphite Sheets PGS Graphite Sheet PGS 100µm (100 +/- 30µm) PGS 70µm (70 +/- 15µm) PGS 25µm (25 +/-10µm) X,Y direction 600 to 800 750 to 950 1500 to 1700 Z direction 15 15 15 Thermal diffusivity (cm2/s) 9 to 10 9 to 10 9 to 10 Density (g/cm3) 0.85 1.10 2.10 Specific Heat (50deg.C)(J/gK) 0.85 0.85 0.85 Heat resistance (deg.C) 400 400 400 X,Y direction 19.6 22.0 30.0 Z direction 0.4 0.4 0.1 Bending test (times) R5 180 deg.C 30000 or more 30000 or more 30000 or more Electric Conductivity (S/cm) 10000 10000 20000 Thermal Conductivity (W/m K) Extensional strength (MPa) Applications of PGS Graphite Sheet (two functions) PGS Graphite Sheet 1)Thermal Transfer PGS Graphite sheet Carrying the heat PGS Graphite sheet A B Heat source (MPUs, PAs, Graphic chips, etc) Diffusing the heat B B Heat sink A B Heat source B 2)Thermal Interface Decreasing the thermal resistance and diffusing the heat Heat sink Heat sink PGS Graphite sheet PGS Graphite sheet B Package Heat source Without PGS Package With PGS The peak temperature drops Surface temperature of the package A Application Example of PGS Graphite Sheet (Transfer) ■ Inspection 1 Size;18x180x0.1mm PGS Cu Al Resistance heater 10x10mm Applied voltage 8V (appro.12W) PGS Graphite Sheet The heat transfer was monitored with thermograph after the heater was attached to the lower part of PGS, Copper and Aluminum. «Heat conductivity when the heater was on.» « Cooling state when the heater was turned on during the heat balance state» After 10 seconds After 20 seconds PGS Cu Al PGS Cu Al ·PGS Graphite Sheet carries the heat rapidly due to high heat conductivity ·PGS Graphite sheet has high cooling effect . Application of PGS Graphite Sheet (Transfer) ■Inspection 2 PGS Graphite Sheet The heat transfer was monitored with thermograph after the heater was attached to the center part of PGS, Copper and Aluminum. [Measuring method] Heater size 10×10mm Resistance Heater Electric power 12W Sample size(heat sink) 90×90×0.3mm Ambient Temperature:25 deg.C *The surface of the samples and the heater was subjected to black oxide treatment. After 30 minutes Aluminum Copper PGS Graphite Sheet ·The temperature of the heater reveals that PGS Graphite Sheet carried the heat, keeping the heat temperature lowest among the three materials. ·The low temperature of PGS surface shows that PGS has high heat dissipation. Thermal Resistance of PGS Graphite Sheet (Interface) PGS Graphite Sheet ■Thermal resistance property Thermal resistance represents the degree of non-conductivity of the heat. Materials with lower thermal resistance are a more efficient conductor of heat (Thermal resistance depends on hardness of, and surface condition of material as well as heat conductivity.) [Measuring Method] Thermal resistance Rth = (T1-T2) / W (deg.C/W) Transistor 1.5x2cm=3cm2 P =approx. 7W Transistor 7w Sample 15 x 20mm Temperature of the transistor T1 Thermal resistance 1.0 Thermal resistance (deg C, cm2/W) The sample is placed and fixed between the transistor and the fin to measure temperature difference, from which the thermal resistance is calculated. Silicon Sheet 0.8 0.6 Competitor’s Graphite PGS 0.1mm 0.4 PGS 0.07mm PGS 0.025mm 0.2 Silicon Grease 0.0 Temperature of the fin T2 Heat sink fin 0 2 4 6 8 10 12 Pressure(kg/cm2) 150x20mm PGS has low thermal resistance due to its high conductivity and flexibility. Shield Effect of PGS Graphite Sheet PGS Graphite Sheet Shielding Effectiveness Test (KEC Method) 140 130 Shield Effect (dB)=-20log(Vs/V0) 120 Shield Effect for Electric Field 110 Shield Effect (dB) 100 90 80 70 60 50 Shield Effect for Magnetic Field 40 30 20 10 0 10 100 Frequency (MHz) 1000 10000 PGS Graphite Sheet Application Development(PGS100µseries) PGS Graphite Sheet ■ PGS100µseries Adhesive type Type 1. PGS only PGS 2. Insulative strong adhesion type PGS Separatin g paper 3. Insulative thin adhesion type PGS Separating paper Insulation type 4. Low thermal resistancetype 5. High heat resistance type PGS PGS Separating Separating paper paper 6. Polyester tape type PGS 7. Polyimide tape type PGS Multilayered type 8. One-sided type PGS 9. Double-sided type PGS Structure Acrylic double-sided adhesive tape 30µm Acrylic double-sided adhesive tape 10µm Acrylic adhesive 10µm Heat-resistance Acrylic adhesive tape 30µm • Adding one-side adhesion • Employing high heat resistance double-sided tape Polyester tape 30µm Polyimide tape 30kµm Silicon 100µm Silicon 100µm • Improving oneside thermal contact and absorbing roughness of contacted face • Low adhesion • Heat resistance • Maximizing the heat property and the flexibility of PGS •Adding one-side adhesion •Employing insulating adhesive tapes • Adding one-side adhesion • Employing insulating adhesive tapes • Adding one-side adhesion • Improving thermal conductivity in adhesive layers Thickness 100μm 130µm 110µm 110µm 130µm 130µm 130µm 200µm 300µm Thermal conductivity 600 to 800 W/m K 500 to 600 W/m K 550 to 650 W/m K 550 to 650 W/m K 500 to 600 W/ m K 500 to 600 W/ m K 500 to 600 W/m K 250 to 350 W/m K 200 to 300 W/m K Withstand temperature 400 deg. 100 deg.C 100 deg.C 100 deg.C 150 deg.C 100 deg.C 180 deg.C 180 deg.C 180 deg.C Part No. Standard size EYGS182310 EYGA091210A EYGA091210M EYGC091210C EYGA091210T EYGA091210P EYGA091210K EYGM121810SS EYGM121810SW 180 x 230mm 90x115mm 90x115mm 90x115mm 90x115mm 90x115m 90x115mm 115x80mm 115x180mm Maximum size 360x460mm Features • Ensuring one-side • Ensuring one-side insulation insulation • Employing • Employing heatinsulating film resistant insulating film 115x180mm • Improving oneside thermal contact and absorbing roughness of contacted face • Low adhesion • Heat resistance PGS Graphite Sheet Application Development (PGS70, 25µseries) PGS Graphite Sheet ■ PGS70,25µseries Adhesive Type 1. PGS only TYPE PGS 2. Insulative strong adhesion type Separating PGS paper 3. Insulating thin adhesion type PGS Separating paper Insulation type 4. High heatresistance type PGS Separating paper 6. Polyester tape type PGS 7. Polyimide tape type PGS Structure Acrylic double-sided adhesive tape 30µm PGS 70µSeries PGS 25µSeries Acrylic double-sided Heat-resistance Acrylic Polyester tape 30µm Polyimide tape 30µm adhesive tape 10µm adhesive tape 30µm Thickness 70µm 100µm 80µm 100µm 100µm 100µm Thermal conductivity 750 to 950 W/m K 550 to 700 W/m K 650 to 800 W/m K 550 to 700 W/m K 550 to 700 W/m K 550 to 700 W/m K Withstand temperature 400 deg.C 100 deg.C 100 deg.C 150 deg.C 100 deg.C 180 deg.C Part No. EYGS182307 EYGA091207A EYGA091207M EYGA091207T EYGA091207P EYGA091207K Standard size 180x230mm 90x115mm 90x115mm 90x115mm 90x115mm 90x115mm Maximum size 180x460mm 115x180mm 115x180mm 115x180mm 115x180mm 115x180mm Thickness 25µm 55µm 35µm 55µm 55µm 55µm Thermal conductivity 1500 to 1700 W/m K 650 to 800 W/m K 1100 to 1250 W/m K 650 to 800 W/m K 650 to 800 W/m K 650 to 800 W/m K Withstand temperature 400 deg.C 100 deg.C 100 deg.C 150 deg.C 100 deg.C 180 deg.C Part No. EYGS121803 EYGA091203A EYGA091203M EYGA091203T EYGA091203P EYGA091203K Standard size 115x180mm 90x115mm 90x115mm 90x115mm 90x115mm 90x115mm Maximum size 115x180mm 115x180mm 115x180mm 115x180mm 115x180mm 115x180mm PGS Graphite Sheet Application Method PGS Graphite Sheet 1.Application Example of PGS through simulation 2.General Thermal Design Model 1.Application Example of PGS (Simulation with heat) PGS Graphite Sheet ◆ In this simulation test, thermal diffusivity will be measured by analyzing heat spot of a layered sample mainly consisting of PWB, IC (heating element), PGS and a case face (ABS Resin). [Model] 35 mm ABS Resin 35x50x1mm K=0.18 W/m K 50 mm Graphite Sheet 25x40mm Thickness : 0.025mm , 0.07mm Measurement point Insulated film 25x40x0.03mm K=0.25 W/m K 9X9 mm at 35 deg.C at 1atm Silicon 9x9x0.5mm K=1 W/m K IC 9x9x1.2mm P=1W PWB 25x40x1mm K (xy)=60W/mK,K(Z)=1W/mK 1.Application Example of PGS (Simulation with heat) PGS Graphite Sheet ◆ Temperature distribution of ABS surface without PGS: The heater (IC) temperature appeared on ABS surface as a heat spot. Model A ABS Result 99.85 deg.C Silicon IC 101.9 deg.C PWB 96.25 deg.C Model B ABS IC PWB Result 93.65 deg.C 103.2 deg.C 97.26 deg.C 1.Application Examination of PGS (Simulation with heat) ◆Heat distribution of the ABS surface with PGS70µ: Diffused the heat and broke the heat spot. Model A-2-70 25x40x0.07 mm with 25x25x0.07 mm with 25x40x0.07 mm without 25x25x0.07 mm without 83.84 deg.C 88.89 deg.C 85.31 deg.C 89.08 deg.C 93.26 deg.C 89.06 deg.C 77.17 deg.C 99.76 deg.C 94.19 deg.C 80.86 deg.C 100.96 deg.C 95.31 deg.C TYPE PGS size Silicon PGS Graphite Sh Model B-1-70 Model B-2-70 eet Model A-1-70 Result Surface Temp IC Temp PWB Temp You can choose whichever application you think is suitable for your purposes-whether to lower the temperature of heat source or to lower the surface temperature. 2.Typical Thermal Design with PGS Graphite Sheet <Blocking and Sealing of Heat Source> [Before] [After] <Heat diffusion to the whole chassis> PGS Graphite Sheet is attached to heat sources to diffuse heat to the whole chassis. Heat spot PGS Graphite Sheet <Heat transfer to the chassis with larger heat capacity> PGS Graphite Sheet is attached to heat sources in Order to lower the temperatures by heat transfer to larger heat capacity area such as hinge. PGS Graphite Sheet PGS Graphite Sheet Heat diffusion to the whole chassis PGS Graphite Sheet Case Heat dissipation to the hinge with larger heat capacity. Heat dissipation to the intermediate chassis with larger heat capacity. PGS Graphite Sheet is attached to a case side in order to diffuse heat spots such as PA, resulting in lowered surface temperature. Heat transfer to cooler area Heat spot 8 to 9℃ reduced PGS Graphite Sheet PGS Graphite Sheet PGS Graphite Sheet PA Isolator PGS Graphite sheet is attached to heat sources in order to lower the temperature of the heat source by heat transfer to cooler area. Intermediate chassis such as metal frame PGS Graphite Sheet is placed between heat sources and the intermediate chassis with larger heat capacity In order to reduce the temperatures of heat sources. PGS Graphite Sheet, an excellent heat transfer material, meets thermal design for various devices with various structures.