Sintering of binderless WC–Mo2C hard materials by rapid sintering process

A Review on Binderless Tungsten Carbide: Development and Application

“…It was thought that the formation of solid solutions between additive and WC could facilitate the densification of WC-based materials. The similar densification mechanism was found in WC–TiC–TaC [ 80 ], WC–VC [ 84 ], and WC–Mo 2 C [ 85 ] systems. Imasato et al [ 80 ] reported that the addition of TaC and TiC facilitated the sintering process of WC because of the formation of (W, Ta, Ti) C solution phase.…”

“…The major toughening mechanisms existing particle-toughened ceramics were ascribed to (i) crack deflection by the particulates ahead of a propagating crack (crack deflection model); (ii) crack bridging by particulates (particulate bridging model); (iii) interaction between the crack front and particulates (crack front bowing model); and (iv) thermal residual stress field resulting from mismatch in coefficients of thermal expansion of ceramic matrix and particulates as well as (v) the grain size [132,133]. With respect to BTC, the most used dispersed phases are Al 2 O 3 [95,99], MgO [134][135][136][137], TiC [79], SiC [71,87,90], Mo 2 C [85], and ZrC [63]. Qu et al [101] successfully prepared WC-Al 2 O 3 composite by employing conventional hot-pressing sintering.…”

Structural stability of α/β-Mo2C during thermochemical processing

“…high hardness and melting point, good thermal stability, electrical conductivity and catalytic properties making them suitable for applications in the field of catalysis [1][2][3][4][5], cutting tools [6][7][8] and hard facing [9]. Mo 2 C is conventionally produced from a stoichiometric blend of molybdenum powder and carbon black, by annealing under argon flow or vacuum at a temperature between 1400 and 1500 • C [10].…”

In-situ elongated β-Si3N4 grains toughened WC composites prepared by one/two-step spark plasma sintering

“…Considering that the metallic binders in cemented carbides are deleterious on hardness and inferior to WC in corrosion and elevated temperature applications [1], WC-based materials with non-metal reinforcements have been fabricated through some newly developing sintering techniques [2][3][4][5][6][7], the toughness of which could be elevated to $6 MPa m 1/2 from $ 4 MPa m 1/2 for pure WC by particle toughening (VC, Mo 2 C, Al 2 O 3 , etc.) and/or phase-transformation toughening (ZrO 2 ).…”