Conclusions
-
1.
An investigation of the shrinkage of bronze specimens with boron additions demonstrated that boron, being a surface-active element with respect to copper, sharply increases the shrinkage of bronze, which is evidently due to the generation of additional defects in interparticle contact zones during the diffusion of boron into the particles.
-
2.
The greatest improvement in the shrinkage, and also strength, of the alloys occurs approximately at the limit of solubility of boron in copper.
-
3.
As a surface-active element, boron reduces the tendency for grain growth during sintering by forming an adsorption layer on the grain surface.
-
4.
Experiments demonstrated that boron in amounts corresponding to its maximum solubility in copper increases the wear resistance of tin bronze.
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5.
The addition of boron simplifies production of dense parts in tin bronze by eliminating all extra pressing and sintering operations.
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6.
As a result of these investigations, it may be concluded that surface-active substances added to powder-metallurgical and other materials will lead to grain refinement, increased shrinkage, and improvement in the properties of these materials.
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Translated from Poroshkovaya Metallurgiya, No. 5(89), pp. 60–66, May, 1970.
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Filatova, N.A., Polushko, A.P., Luzhanskaya, N.Y. et al. Effects of boron on the properties of sintered tin bronze. Powder Metall Met Ceram 9, 400–405 (1970). https://doi.org/10.1007/BF00796509
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DOI: https://doi.org/10.1007/BF00796509