Effects of Diamond on Microstructure, Fracture Toughness, and Tribological Properties of TiO2-Diamond Composites

Abstract

The reinforcements represented by graphene nanoplatelets, graphite, and carbon nanotubes have demonstrated the great potential of carbon materials as reinforcements to enhance the mechanical properties of TiO2. However, it is difficult to successfully prepare TiO2-diamond composites because diamond is highly susceptible to oxidation or graphitization at relatively high sintering temperatures. In this work, the TiO2-diamond composites were successfully prepared using high-pressure sintering. The effect of diamond on the phase composition, microstructure, mechanical properties, and tribological properties was systemically investigated. Diamond can improve fracture toughness by the crack deflection mechanism. Furthermore, the addition of diamond can also significantly reduce the friction coefficient. The composite composed of 10 wt.% diamond exhibits optimum mechanical and tribological properties, with a hardness of 14.5 GPa, bending strength of 205.2 MPa, fracture toughness of 3.5 MPa∙m1/2, and a friction coefficient of 0.3. These results enlarge the family of titania-based composites and provide a feasible approach for the preparation of TiO2-diamond composites.

Enantioanalysis of Cysteine Using an Enantioselective Stochastic Platform: A Key Factor on Early Diagnosis of Breast Cancer

“…In addition, the intensity of the diffraction peak (2θ = 43.9°) corresponding to the (111) plane of diamond in the sample was consistent with the amount added to the powder mixture. 22 Response characteristics of the enantioselective stochastic platform.-The stochastic method was used to determine the response characteristics of the enantioselective stochastic platform (Table I).…”

Toughness Characterization and Toughening Mechanism of Diamond-like Carbon Films

“…A film toughness involves the film cohesion and impact load resistance. The toughness may reflect the resistance ability of the formation of cracks due to the stress accumulation in the vicinity of the defects [14][15][16]. A film of high toughness shares both a high resistance to crack initiation and a high energy absorption rate to prevent crack propagation, so as to avoid serious failures, such as film damage and peeling during usage.…”