TiB2 is considerably stronger under compression


Like most structural ceramics, TiB2 is considerably stronger under compression than flexure or tension. The quantity of available data is very limited, and no two results were obtained by the same method. With that caution, at room temperature, it appears that the dependence of compressive strength σc on density is approximately linear, ranging from 1.1 GPa at 3.8 g/cm3 to 1.8 GPa at 4.5 g/cm3 when the grain size is (18±3) μm. There also appears to be a significant dependence on the grain size, but the data set is limited to only one additional value, 5.7 GPa for a density of 4.51 g/cm3 and a grain size of 10 μm. Every batch of brittle specimens has a distribution of flaw sizes, resulting in a distribution of measured strength values. For most structural ceramics, the Weibull distribution with two parameters adequately describes the strength distribution. In this distribution, the Weibull modulus parameter m indicates the uniformity of the strength among the specimens. Higher values of m imply a narrower distribution of strengths. Reliable determinations of the Weibull modulus, however, require the fracture of a relatively large number of specimens, at least 30 specimens, according to the ASTM (American Society for Testing and Materials) standard test method C 1161. For TiB2, results for this number of specimens have rarely been reported in the current literature. The three values that may be cited here have significant differences: m = 11 for a sintered material with ρ = 4.55 g/cm3 and g = 8 μm; m = 29 for a hot pressed material with ρ = 4.51 g/cm3 and g = 10 μm; and m = 8 for a hot pressed material with ρ = 4.48 g/cm3 and g = 15 μm. If you are looking for high quality, high purity, and cost-effective Titanium diboride, or if you require the latest price of Titanium diboride, please feel free to email contact mis-asia.

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