ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The aim of the present work was to substitute a portion of WC in WC-10 wt% Co hard metal by TiN by modification of the binder phase, and to produce an equivalent grade of hard metal. Sintering studies were carried out in both H2 and H2-N2 (50∶50) mixture. Introduction of TiN into WC-10Co hard metal resulted in a high sintered porosity, and as a consequence the mechanical properties deteriorated. Partial substitution of cobalt in WC-8.7TiN-12Co by nickel further increased the sintered porosity and led to a non-uniform microstructure. Incorporation of Mo2C along with cobalt-nickel binder promoted a fine-grained structure, which resulted in better sintered properties than those of WC-8.7TiN-6Co-6Ni hard metal. However, hot isostatic pressing (HIP) treatment of the liquid-phase sintered alloys was effective in eliminating the large pores and thus greatly enhanced the mechanical properties. HIPed hard metal of WC-8.7TiNS-12Co composition showed properties almost equivalent to those of WC-10Co hard metal.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01107224
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