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텅스텐 활성소결에서 입계확산의 역할 KCI 등재

The Role of Grain Boundary Diffusion in the Activated Sintering of Tungsten Powder

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  • URLhttps://db.koreascholar.com/Article/Detail/1931
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한국분말재료학회(구 한국분말야금학회) (Korean Powder Metallurgy Institute)
초록

The mechanism of activated sintering of tungsten powder was discussed in terms of diffusion and segregation of activator atoms at W grain boundaries. Shrinkage behaviours of W-0.2wt.% Ni, W-0.2wt.% Cu or pure W powder compacts during sintering at low temperatures of 900~ were investigated. It was found that the Cu additive inhibits sintering process causing lower densification than pure W compact while remarkable shrinkage occurred in the Ni added W powder. Such contrary effect was explained by comparing self diffusion processes along Ni or Cu segregated W boundaries in which Ni segregants enhance but Cu atoms retard the migration of W atoms at W boundaries.

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