Interaction of diamond grains with nanosized alloying agents in metal–matrix composites as studied by Raman spectroscopy

Effect of Ti/Ni Coating of Diamond Particles on Microstructure and Properties of High-Entropy Alloy/Diamond Composites

“…For the peaks at 1350 cm −1 (D-band) and 1580 cm −1 (G-band) (Figure 5c), the peak shape is wide, the G-band strength and D-band strength are close (Figure 5d) and the area ratio of ID/IG is about 2.35, which is obviously higher than that of the uncoated diamond samples. The results show that the graphitization degree of diamond particles in uncoated diamond samples is higher [18] and the other bonds indicate that there are carbides or oxides at the interface [19]. In conclusion, coated diamond can effectively inhibit the graphitization structural transformation of diamond particles in the SPS process and improve the material properties.…”

Self-assembling WC interfacial layer on diamond grains via gas-phase transport mechanism during sintering of metal matrix composite

“…c o m / l o c a t e / m a t d e s metal binder is solved by an additional coating step, which complicates the manufacturing process and increases costs. Another efficient method to enhance the mechanical properties of various binders is to add a controlled amount of nano additives (e.g., WC, ZrO 2 , Al 2 O 3 , and carbon nanotubes), which allows improving performance of diamond tools considerably [23][24][25][26][27][28][29]. A significant increase in performance of tools with tungsten carbide alloyed binder was reported [27,28].…”

“…Enhanced wear resistance was caused by the simultaneous increase in hardness and strength of binder, reduced friction coefficient and increased diamond retention. It was determined that solid-state sintering using Fe-based binder with WC nanoparticles reduces graphitization of diamonds [29]. There are two reasons for that: (1) the WC nanoparticles decrease a contact area between a diamond and the metal catalyst in the binder and (2) they catalyze the grain-boundary graphite diffusion from the diamond surface into the binder.…”

Diamond synthesis in aluminum matrix in molten alkali-halide at ambient pressure

“…Nowadays, the primary industrial diamond synthesis method is a solution-melt metal-carbon synthesis at high pressures (temperatures of 1400-1600°С, pressures of 50-60 GPa) [2][3][4][5]. Graphite, or other carbon-containing compounds, and metals or iron, nickel, cobalt, platinum or palladium alloys are typically used as a load.…”