Effects of different BN grades on the machinability of Si3N4–MoSi2–BN composites

Tribological and electrochemical corrosion behavior of Ni–W/BN (hexagonal) nano-composite coatings

“…Its high temperature steadiness, small coefficient of friction and inertness in a wide variety of chemical environments have made BN (h) as a perfect alternative to other solid lubricants in many high performance applications. This inorganic solid powder has kept its capability to lubricate in excessive cold or heat [18][19][20][21]. The purpose of the inclusion of heavy particles (SiC, TiC, Al 2 O 3 , and ZrO 2 ) into metal surface is to enhance the wear resistance and hardness of coatings.…”

Combustion synthesis and mechanical properties of MoSi₂–ZrB₂–SiC ceramics

“…Reinforcements of MoB, 13), 14) TiC, 15) CrB 2 , 16) BN, 17) B 4 C 18) and Si 3 N 4 19) can improve fracture toughness of MoSi 2 . Patel et al 20) investigated the nanocrystalline SiCMoSi 2 composite which was fabricated by liquid silicon infiltration and its average hardness and fracture toughness to 12 GPa and 4.3 MPa m 1/2 , respectively.…”

Investigation on the preparation and machinability of the B4C/BN nanocomposites by hot-pressing process

“…5(b), the weak interface between the B 4 C matrix grains and the h-BN particles, and the microcracks within the h-BN particles were observed in the TEM micrograph. The weak interface between the B 4 C matrix grains and the h-BN particles, and the microcracks within the h-BN particles would be of advantage to the machinability of the composites (Guicciardi et al, 2007;Kusunose et al, 2002a,b;Padture et al, 1995;Shuba and Chen, 2006;Wang et al, 2004a,b). When the nanocomposites sample was machined, the microcracks resulting from the machining damage would propagate along the weak interface between the B 4 C matrix grains and the h-BN particles, and as well as propagate along the microcracks within the h-BN particles, and the cleavage behavior of the laminate structured h-BN particles would promote the microcracks propagation in the ceramics matrix.…”

“…The intergranular h-BN particles were effective for the machinability of the composites, because the intergranular fracture was frequently observed in the drilled surface of the composites. It has been reported that the machinability was caused by the weak interface between the matrix grains and the second phase at the grains boundaries (Guicciardi et al, 2007;Kusunose et al, 2002a,b;Padture et al, 1995;Shuba and Chen, 2006;Wang et al, 2004a,b). Therefore, in our study, the excellent machinability observed in the B 4 C/BN nanocomposites was primarily attributed to the weak interface between the B 4 C matrix grains and the intergranular h-BN particles, as well as the cleavage behavior of the h-BN particles.…”