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• W1949046997 abstract "Densification behavior and microstructure evolution of hot-pressed HfB2 were studied. When unmilled HfB2 was hot pressed at 2200°C, the resulting ceramics contained open porosity (85.8%ρth.). In contrast, attrition-milled HfB2 containing ∼0.7 wt% WC–Co milling contamination could be hot pressed to >98% density at temperatures as low as 1900°C. The addition of either boron carbide (4 wt%) or carbon (2 wt%) improved densification and reduced the temperature necessary to reach full density to 1750° and 1850°C, respectively. Full density (>99%) was achieved for additive free, attrition-milled HfB2 at temperatures of 1950°C or higher. Fully dense HfB2 was also produced with the addition of 1 wt% carbon, although 2.1 vol% residual carbon remained in the microstructures after densification. The combination of carbon additions and WC impurities, introduced during milling, resulted in the formation of (Hf,W)C0.98 solid solution inclusions. (Hf,W)C0.98 formation suggested that carbon reacted with HfO2 impurities, which were present on particle surfaces from powder processing. The improved densification behavior with the addition of boron carbide or carbon suggests that both additives increase hafnium and/or boron mobility." @default.
• W1949046997 created "2016-06-24" @default.
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• W1949046997 date "2010-11-02" @default.
• W1949046997 modified "2023-10-13" @default.
• W1949046997 title "Densification Behavior and Microstructure Evolution of Hot-Pressed HfB2" @default.
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• W1949046997 doi "https://doi.org/10.1111/j.1551-2916.2010.04063.x" @default.
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