Conclusions
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1.
It has been established that shrinkage and densification during liquid phase sintering under pressure in the W-Cu-Ni system, like those in the system W-Cu, are only slightly affected by changes in the particle size of the solid phase above 100 μ. A marked effect of the particle size on densification is observed only with micropowders.
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2.
The presence of an element in which the refractory component can dissolve substantially increases the shrinkage of the composite and enables a high degree of densification to be attained at a lower liquid phase content than is necessary with systems composed of mutually insoluble constituents.
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3.
Metallographic examinations have shown that increasing the nickel content of the liquid phase and raising the pressure applied during sintering promote growth of tungsten grains.
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4.
The results obtained provide a basis for the selection of optimum sintering conditions, ensuring full densification of composites and the attainment of the required grain size, in the manufacture of pseudo alloys of predetermined mechanical properties.
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Translated from Poroshkovaya Metallurgiya, No. 4(172), pp. 43–49, April, 1977.
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Naidich, Y.V., Lavrinenko, I.A. & Evdokimov, V.A. Liquid phase sintering under pressure of tungsten-nickel-copper composites. Powder Metall Met Ceram 16, 276–280 (1977). https://doi.org/10.1007/BF00806129
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DOI: https://doi.org/10.1007/BF00806129