Improving the fracture toughness of MgO–Al2O3–SiO2 glass/molybdenum composites by the microdispersion of flaky molybdenum particles |
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Authors: | Y WAKU M SUZUKI Y ODA Y KOHTOKU |
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Affiliation: | (1) Ube Research Laboratory, Corporate Research and Development, UBE Industries, Ltd., 1978-5, Kogushi, Ube City,Yamaguchi 755, Japan |
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Abstract: | The flake-forming behaviour of powders of molybdenum, niobium, nickel, BS 316 S 12, Ni–17Cr–6Al–0.6Y, iron, titanium and Ti–6Al–4V,
using a wet ball mill, was investigated. MgO–Al2O3–SiO2 (MAS) glass composites reinforced with these flaked particles were fabricated, and improvements in flexural strength evaluated.
The MAS glass composites reinforced with flaky metallic particles such as molybdenum, niobium, iron, nickel and Ni–17Cr–6Al–0.6Y,
showed an improvement. The effect of molybdenum particle size on the flake-forming behaviour of molybdenum, flexural strength
and fracture toughness of MAS glass/molybdenum composites, were investigated. The flake-forming behaviour shows a high degree
of dependence on molybdenum particle size and, upto a size of 32 μm, becomes conspicuous with increasing particle size. At
32 μm, the aspect ratio reaches a value of 17 and, above 32 μm, flake forming saturates. Fracture toughness is closely related
to flake-forming behaviour and the more marked the flake forming, the greater is the increase in fracture toughness. A composite
of MAS glass with flaky molybdenum particles has a greater improvement effect on fracture toughness than composites with SiC
whiskers, SiC platelets or ZrO2 particles. This is closely linked to plastic deformation of the flaky metallic particles at the crack tip at the time of
fracture.
This revised version was published online in November 2006 with corrections to the Cover Date. |
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