Laser-induced transient gratings application for measurement of thermal conductivity of CVD diamond

2003 ◽  
Author(s):  
E. V. Ivakin ◽  
A. V. Sukhadolau ◽  
Victor G. Ralchenko ◽  
A. V. Vlasov
Keyword(s):  
Thermal Conductivity ◽  
Cvd Diamond ◽  
Transient Gratings

Thermal conductivity and the microstructure of state-of-the-art chemical-vapor-deposited (CVD) diamond

1993 ◽  
Vol 2 (5-7) ◽  
pp. 1059-1063 ◽  
Author(s):  
J.E. Graebner ◽  
S. Jin ◽  
G.W. Kammlott ◽  
Y.-H. Wong ◽  
J.A. Herb ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
State Of The Art ◽  
Chemical Vapor ◽  
Cvd Diamond ◽  
Chemical Vapor Deposited

Thermal Conductivity Measurement of CVD Diamond Films Using a Modified Thermal Comparator Method

2000 ◽  
Vol 122 (4) ◽  
pp. 808-816 ◽  
Author(s):  
K. R. Cheruparambil ◽  
B. Farouk ◽  
J. E. Yehoda ◽  
N. A. Macken
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Thermal Resistance ◽  
Calibration Curve ◽  
Thermal Contact ◽  
Diamond Films ◽  
Conductivity Measurement ◽  
Cvd Diamond ◽  
Conductive Heat ◽  
Comparator Method

Results from an experimental study on the rapid measurement of thermal conductivity of chemical vapor deposited (CVD) diamond films are presented. The classical thermal comparator method has been used successfully in the past for the measurement of thermal conductivity of bulk materials having high values of thermal resistance. Using samples of known thermal conductivity, a calibration curve is prepared. With this calibration curve, the comparator can be used to determine thermal conductivity of unknown samples. We have significantly modified and extended this technique for the measurement of materials with very low thermal resistance, i.e., CVD diamond films with high thermal conductivity. In addition to the heated probe, the modified comparator employs a thermoelectric cooling element of increase conductive heat transfer through the film. The thermal conductivity measurements are sensitive to many other factors such as the thermal contact resistances, anisotropic material properties, surrounding air currents and temperature, and ambient humidity. A comprehensive numerical model was also developed to simulate the heat transfer process for the modified comparator. The simulations were used to develop a “numerical” calibration curve that agreed well with the calibration curve obtained from our measurements. The modified method has been found to successfully measure the thermal conductivity of CVD diamond films. [S0022-1481(00)00804-5]

Improvement on the Cutting Performance of CVD Diamond Coated Drills in Drilling CFRP

2012 ◽  
Vol 499 ◽  
pp. 366-371 ◽  
Author(s):  
Jian Guo Zhang ◽  
Ben Wang ◽  
Fang Hong Sun ◽  
Hang Gao
Keyword(s):  
Thermal Conductivity ◽  
Wear Resistance ◽  
Diamond Films ◽  
Chemical Vapor ◽  
Cvd Diamond ◽  
Cutting Performance ◽  
Reinforced Plastics ◽  
Coated Tool ◽  
Hot Filament

Carbon fiber reinforced plastics (CFRP) is difficult to machine because of the extremely abrasive nature of the carbon fibers and its low thermal conductivity. CVD diamond films have many excellent properties such as wonderful wear resistance, high thermal conductivity and low friction coefficient, therefore depositing diamond films on the surface of drills is thought to be an effective way to elongate the lifetime of drills and improve the cutting performance. In this study, diamond films are deposited on the WC-Co drill using hot filament chemical vapor deposition (HFCVD) method. The results of characterization by the scanning electron microscope (SEM) and Raman spectrum indicate that the fabricated CVD diamond coated drill is covered with a layer of uniform and high-purity diamond films. The cutting performance of as-fabricated CVD diamond coated drill is evaluated in dry drilling CFRP, comparing with the uncoated WC-Co drill. The results demonstrate that the CVD diamond coated drill exhibits much stronger wear resistance. Its flank wear is about 50μm after drilling 30 holes, about one-third of that of WC-Co drill. Machining quality of the exit and internal wall of drilled holes shows better surface finish obtained by coated drill, which suggests that CVD diamond coated tool has great advantages in drilling CFRP.

Thermal conductivity of CVD diamond at elevated temperatures

2005 ◽  
Vol 14 (3-7) ◽  
pp. 589-593 ◽  
Author(s):  
A.V. Sukhadolau ◽  
E.V. Ivakin ◽  
V.G. Ralchenko ◽  
A.V. Khomich ◽  
A.V. Vlasov ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Elevated Temperatures ◽  
Cvd Diamond

Thermal conductivity of polycrystalline CVD diamond: Experiment and theory

2008 ◽  
Vol 107 (3) ◽  
pp. 462-472 ◽  
Author(s):  
A. V. Inyushkin ◽  
A. N. Taldenkov ◽  
V. G. Ral’chenko ◽  
V. I. Konov ◽  
A. V. Khomich ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Cvd Diamond

Recent Progress in Diamond Raman Lasers

2012 ◽  
Vol 1395 ◽  
Author(s):  
Richard P. Mildren
Keyword(s):  
Thermal Conductivity ◽  
Recent Progress ◽  
Raman Laser ◽  
Cvd Diamond ◽  
High Thermal Conductivity ◽  
Transmission Range ◽  
Short History ◽  
Laser Material ◽  
Raman Lasers

ABSTRACTIn its relatively short history as a Raman laser material, CVD diamond has already demonstrated to be a forerunner in performance. Yet the more outstanding properties of the material such as its high thermal conductivity and wide transmission range remain largely unexploited. This paper summarizes the recent studies aimed to extend diamond laser capability beyond that readily achievable using other materials, focusing on in particular diamond Raman lasers in the ultraviolet, infrared and at high average powers.

COMPARISON OF THERMAL CONDUCTIVITIES ON ABRADED AND UNTREATED CVD-DIAMOND OBTAINED BY SCANNING THERMAL MICROSCOPY

2002 ◽  
Vol 16 (06n07) ◽  
pp. 922-926 ◽  
Author(s):  
A. ALTES ◽  
R. HEIDERHOFF ◽  
L. J. BALK ◽  
H. G. JENTSCH ◽  
S. M. ROSIWAL
Keyword(s):  
Thermal Conductivity ◽  
Order Approximation ◽  
Cvd Diamond ◽  
Heat Sinks ◽  
Diamond Surface ◽  
Scanning Thermal Microscopy ◽  
Diamond Grit ◽  
Thermal Microscopy ◽  
First Order Approximation ◽  
Micro Structures

Diamond materials have become progressively significant in the fabrication of heat sinks for power devices and lasers. To investigate the influence of polishing on CVD-Diamond, the surfaces of <100> and <110> coatings were analyzed, after a first abrasive treatment on a 30μm diamond grit by scanning thermal microscopy based on a resistive platinum-probe. This technique describes in first order approximation the heat transfer of a metal-diamond interface. Through this method it was possible to diagnose a relevant reduction in thermal conductivity by a harsh sample preparation depending on the crystal orientation. The thermal conductivity of as deposited <100> diamond was measured at 1290 W/mK and was reduced to 250 W/mK. The thermal conductivity of as deposited <110> diamond was determined at 1780 W/mK whereas the same diamond surface, but abraded, shows a thermal conductivity of just 460 W/mK. Additionally the received images which represents the thermal conductivity qualitatively bring forward micro structures like e.g. grain boundaries.

Sign in / Sign up

Export Citation Format

Share Document