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- W2087091821 abstract "The microstructure of sintered carbide compacts generally contain facetted and abnormally grown grains. In the present work we show that the addition of a small quantity of boron to tungsten carbide powders can induce isotropic coarsening without any abnormal grain growth. The ability of boron to reduce faceting is brought about by the oxidation of boron at low temperatures which leads to isotropic wetting and roughening of particle boundaries during sinter-coarsening at elevated temperatures. Increase in boron content leads to enhanced grain growth and a limiting value to the boron concentration is suggested. Increase in the ambient pressure during sintering increases oxidation of boron and also the sintering temperature leading to a change in both grain shape and size. The isotropic coarsening behavior of WC in the presence of boron conforms to Jackson’s theory of crystal growth based on the energetics of a rough liquid–solid interface." @default.
- W2087091821 created "2016-06-24" @default.
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- W2087091821 date "2013-02-01" @default.
- W2087091821 modified "2023-10-16" @default.
- W2087091821 title "Effect of boron on the microstructure of spark plasma sintered Ultrafine WC" @default.
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- W2087091821 doi "https://doi.org/10.1016/j.vacuum.2012.01.014" @default.
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