Wear-resistant boride composites with high percentage of reinforcement phase
A highly wear resistant sintered, hot pressed, or otherwise compacted ceramic composite material is described, consisting of two discrete phases of the form AlxMgyB14 where x and y ≦1 or like hard, orthorhombic compounds, and TiB2 or like Group IVB transition metal di-borides, and with an unexpectedly high contentof transition metal di-boride in the range from 40 to 90 percent (28 to 85 volume percent).
Boron-rich crystals in A1-M-B (M = Li, Be, Mg) systems grown from high-temperature aluminum solutions
Abstract Crystals of icosahedral B12 compounds grown from high-temperature A1 solutions have been studied. The crystals grown are A1LiB14, A1MgB14 and A1~1.1Be~0.6B22. They are obtained as platelets or irregularly shaped polyhedra with maximum dimensions of 5 to 7 mm. The crystallography and the mechanical properties of these materials are presented.
An empirical ranking of a wide range of WC-Co grades in terms of their abrasion resistance measured by the ASTM standard B 611-85 test
This paper reports the results of a comprehensive investigation into the abrasion resistance of WC-Co alloys, as measured by the ASTM Standard B 611-85 test. The alloys ranged from 3 to 50 wt% and from 0.6 to 5 μm average grain size. Careful control of the grain size has led to new results and new insight into the relationships between abrasion resistance, hardness, cobalt content, grain size and mean free path.