Tj. Davies et Aa. Ogwu, CHARACTERIZATION OF COMPOSITE OF TIC-BASED BINDER ALLOY - MECHANICAL AND MICROSTRUCTURAL PROPERTIES(TIB2 BONDED WITH NICKEL), Powder Metallurgy, 38(1), 1995, pp. 39-44
Studies of the bonding mechanisms in transition metal and hardmetals b
ased on transition metals have been conducted to examine the current u
nderstanding of the binder-hardmetal interfacial reactions in cemented
hardmetals. The studies led to the proposal of a binder selection pro
cedure to be used, in conjunction with thermodynamic and phase equilib
ria data, for binder selection based on the number of d state electron
s in the constituent transition metals. The binder selection procedure
developed was used to select a preferred binder composition for a TiC
+ TiB2 composite. An experimental investigation of the selected binde
r for the TiC + TiB2 composite led to an improvement in densification
after sintering, three point bend strength (modulus of rupture values)
, and identation fracture toughness K(IC) values. Electron probe micro
analysis and scanning transmission electron microscopy investigations
revealed the segregation of one of the constitutent metal additives in
the composites which indicated a need for adjustment of the powder pr
eparation procedures to achieve further improvement in mechanical prop
erties.