Abstract
A comparative study of the sinterability of combustion-synthesized titanium diboride was conducted over the temperature range of 1800 to 2100° C. During the initia! sintering stage, the densification rate was slightly higher in the combustion-synthesized than in the commercially obtained titanium diboride. For sintering times of > 30 min, however, the shrinkage rates for both types of powders were the same. The activation energy for the late sintering stage was 774 ± 46 kJ mol−1, consistent with 8 volume diffusion mechanism, end was the same for both combustion-synthesized and commercial powders. The microstructures of sintered specimens with initial particle size below 1O µm exhibited a grain size ranging from 5 to over 40 µm after 30 min of sintering. The addition of 5 wt% NbB2 to the combustion-synthesized resulted in enhanced shrinkage during the initial sintering stage, but did not affect later stage kinetics. Various amounts of additives of CrB2, NiB and TiC had no effect on early and late stage sintering kinetics, with the exception of 50 wt% TiC which appreciably inhibited densification.
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Ouabdesselam, M., Munir, Z.A. The sintering of combustion-synthesized titanium diboride. J Mater Sci 22, 1799–1807 (1987). https://doi.org/10.1007/BF01132409
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DOI: https://doi.org/10.1007/BF01132409