Skip to main content
SpringerLink
Log in

Compactability of powdered copper-lanthanum hexaboride composites under hydrostatic treatment

  • Published:
Soviet Powder Metallurgy and Metal Ceramics Aims and scope

Conclusions

The compactability of powder composites copper-lanthanum hexaboride depends largely on the content of additive. Under hydrostatic pressing of powder mixtures the hard inclusions of LaB6 hinder plastic deformation of copper particles, and thereby they hinder densification of the composite. In sintering of compacts the additive LaB6 hinders the increase of volume of the specimens; on the other hand, an increase of content of LaB6 hinders shrinkage of the composite material. In hydroextrusion of sintered compacts, inclusions of lanthanum hexaboride increase the deformation resistance of the material, and that increases the extrusion pressure of the composite, causing the most intense “healing” of pores.

Almost pore-free powder materials of the system Cu-LaB6 were obtained by hydrostatic pressing at pressures of 800–1000 MPa, sintering in hydrogen at 950°C for 2 h and subsequent hydroextrusion with reduction ɛ=80–90%.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

Literature cited

  1. G. G. Gnesin, G. V. Levchenko, and R. B. Luban, “Cathode materials with inclusions of emission-active phase,” Poroshk. Metall., No. 7, 75–80 (1982).

    Google Scholar 

  2. V. I. Krzhanovskii, A. I. Kuz'michev, and G. V. Levchneko, “Investigation of the behavior of cathode materials, containing inclusions of emission-active phase, in the regime of superdense glow discharge,” Poroshk. Metall., No. 9, 73–75 (1981).

    Google Scholar 

  3. G. V. Levchenko, R. B. Luban, and O. V. Yadova, “Metallographic investigations of traces of erosion on the surface of cathodes with inclusions of emission phase,” in: Electric Contacts. Ways of Improving Quality and Reliability [in Russian], Inst. Probl. Mater., Akad. Nauk Ukr. SSR, Kiev (1981), p. 43.

    Google Scholar 

  4. P. A. Verkhovodov, T. I. Kuz'mina, G. V. Levchenko, et al., “Possibility of forming materials based on copper and lanthanum hexaboride,” Poroshk. Metall., No. 8, 59–63 (1979).

    Google Scholar 

  5. N. V. Andreeva, I. D. Radomysel'skii, and N. I. Shcherban', “Investigation of the compatibility of powders,” Poroshk. Metall., No. 6, 32–42 (1975).

    Google Scholar 

  6. I. D. Radomysel'skii and N. I. Shcherban', “Some peculiarities of the compaction of powders at different stages of pressing,” Poroshk. Metall., No. 11, 12–19 (1980).

    Google Scholar 

  7. B. I. Beresnev and E. V. Trushin, The Process of Hydroextrusion [in Russian], Nauka, Moscow (1976).

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Institute of Materials Science, Academy of Sciences of the Ukraine, Kiev

    L. R. Vishnyakov & A. G. Kamenetskii

Authors
  1. L. R. Vishnyakov
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. A. G. Kamenetskii
    View author publications

    You can also search for this author in PubMed Google Scholar

Additional information

Translated from Poroshkovaya Metallurgiya, No. 5(353), pp. 18–22, May, 1992.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Vishnyakov, L.R., Kamenetskii, A.G. Compactability of powdered copper-lanthanum hexaboride composites under hydrostatic treatment. Powder Metall Met Ceram 31, 385–388 (1992). https://doi.org/10.1007/BF00796245

Download citation

  • Received:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF00796245

Keywords

Search

Navigation