WC-TiC-10%Co超硬合金の基礎的諸性質に及ぼす他炭化物添加の影響
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Properties of WC-TiC-10% Co and β-10%Co alloys containing up to 20 mol% of various carbides, i.e., V<SUB>4</SUB>C<SUB>3</SUB>, Cr<SUB>3</SUB>C<SUB>2</SUB>, ZrC, NbC, Mo<SUB>2</SUB>C and TaC were studied at room temperature.<BR>The results are as follows:(1) Grain size of the β-phase in β-10%Co alloy is increased by addition of Cr<SUB>3</SUB>C<SUB>2</SUB> and V<SUB>4</SUB>C<SUB>3</SUB>, and is reduced by ZrC, NbC and TaC. Heterogeneous β-phase appears as the amount of ZrC increases. (2) The lattice parameters of β-phase, i.e., carbide containing β-phase, increase with increasing ZrC, NbC and TaC but decrease sharply with addition of Cr<SUB>3</SUB>C<SUB>2</SUB>, V<SUB>4</SUB>C<SUB>3</SUB> and Mo<SUB>2</SUB>C. (3) A large amount of Cr<SUB>3</SUB>C<SUB>2</SUB> dissolves into the binder phase, but the other carbides are almost insoluble. (4) The hardness of the alloys is increased by ZrC and reduced by Cr<SUB>3</SUB>C<SUB>2</SUB>. (5) The strength of the alloys, which is higher in Ni binder than in Co binder, is decreased remarkably by adding V<SUB>4</SUB>C<SUB>3</SUB>, Cr<SUB>3</SUB>C<SUB>2</SUB> and ZrC, and is improved by Mo<SUB>2</SUB>C, NbC and TaC. The strength of the three phase (WC-β-γ) alloys is associated with that of two phase (β-7) alloys, suggesting that the strength of two or three phase alloy is controlled by that of β-phase or of β/γ interface.
- 社団法人 粉体粉末冶金協会の論文
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