Effect of Ti on the holding force of Al-based bonded diamond bits

To study the effect of Ti on the holding force of Al-based bonded diamond bits, Ti powders in different mass fractions were added in the Al-based bonded, the Al-based bonded bits without and with diamond were fabricated by hot pressing method. The flexural strength of bits with different Ti contents by mass were tested, and the holding force coefficient between Al-based bonded and diamond were calculated. Moreover, the fracture surface morphology and composition of the Al-based bonded diamond bits were characterized by scanning electron microscope and energy dispersive X-ray micro-analyzer. The results show that, with the increasing of Ti content by mass, the flexural strength and holding force coefficient of the bits are enhanced firstly and then decreased. When the adding content of Ti powder is 3% by mass, the maximum values of flexural strength and holding force coefficient are 145 MPa and 82.5 %, respectively; furthermore, the combining state between Al-based bonded and diamond is the best.