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Investigations into the tribological behavior of polycrystalline alumina ceramics often treat the materials as monolithic alumina materials. But in fact, high-alumina ceramics are available in a wide range of compositions, both in terms of alumina content and grain-boundary chemistry, and this variation in composition can have an important influence on the wear behavior of the material. In this study,...
In this study, the hardness, fracture toughness, and abrasive wear behavior of three zirconia-toughened MoSi 2 composites and a zirconia-toughened Al 2 O 3 were examined and compared with similar materials containing no zirconia second phases. Each of the composites contained 20 vol.% ZrO 2 ; however, the polymorph of the added zirconia particles was varied to give...
The abrasive wear of brittle materials, while not a true property of materials, is generally modeled as an inverse function of both the bulk hardness and fracture toughness. According to these models, an increase in the hardness and/or fracture toughness of a material will therefore enhance its wear resistance. In ceramic materials, the addition of whisker reinforcement is a proven method of enhancing...
Investigations into the tribological behavior of polycrystalline alumina ceramics generally treat the materials as monolithic aluminas. However, sintering aids added during the commercial production of these materials frequently result in the formation of a continuous second phase at the grain boundaries, even in materials that are nominally 99.9% Al 2 O 3 . This second phase may either...
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