Abstract
Young's moduli of some sintered hard materials (WC-CO alloys and hot pressed Si3N4) were measured by Speckle Photography. The advantage of using this strain measurement method was emphasized for the determination of Young's moduli in these hard materials.
The results of this study are summerized as follows:
(1) Young's moduli of the sintered hard materials in this study were found to be uniform along specimen axes under static compression.
(2) It was confirmed that Young's modulus of WC-Co alloys decreases with the increase in Co content, as has been reported before.
(3) In hot pressed Si3N4, Young's modulus along the axis pallarel to the hot pressing direction was found to be larger than that vertical to the hot pressing direction by seven to ten percent.
