Simultaneous measurements of the thermal conductivity, thermal capacity and thermal diffusivity of an individual carbon fibre

2007 ◽  
Vol 40 (15) ◽  
pp. 4686-4690 ◽  
Author(s):  
Z L Wang ◽  
D W Tang ◽  
W G Zhang
Keyword(s):  
Thermal Conductivity ◽  
Thermal Diffusivity ◽  
Carbon Fibre ◽  
Thermal Capacity ◽  
Simultaneous Measurements

Thermal Properties Measurement Photoacoustic Technique for Hardmetals

2006 ◽  
Vol 530-531 ◽  
pp. 41-47 ◽  
Author(s):  
F.A.L. Machado ◽  
Roberto da Trindade Faria Jr. ◽  
Marcello Filgueira ◽  
M.F. Rodrigues ◽  
Guerold Sergueevitch Bobrovinitchii ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Diffusivity ◽  
Cutting Tool ◽  
Thermal Capacity ◽  
Liquid Phase Sintering ◽  
Point Of View ◽  
Photoacoustic Technique ◽  
Photoacoustic Cell ◽  
Open Photoacoustic Cell ◽  
High Pressure High Temperature

The open photoacoustic cell technique (OPC) was carried out in order to measure the thermal diffusivity of hardmetal. Hardmetal is usually processed by the conventional powder technology techniques: mix of WC + Co powders, compacting, and liquid phase sintering A new method to process hardmetal parts is hereby described. Parts of WC-15%wt Co were processed by using high pressure – high temperature sintering. It was used the pressure of 5GPa, temperature of 1350 oC, and time of 2 minutes of sintering. In addition to the thermal diffusivity, heat capacity was considered and the thermal conductivity achieved. Results matched with the values of the literatures where others photoacoustic techniques have been employed. It was achieved a thermal capacity of 3.34J/cm3K, thermal diffusivity of 0.35cm2/s, and thermal conductivity of 116.9W/mK. It reveals that the HPHT processed WC- 15%wtCo hardmetal is able to work as a cutting tool, in the thermal point of view.

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