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Structural studies of ceramics based on detonation-wave-treated graphite-like boron nitride

  • Theory And Technology Of Sintering Processes, Thermal And Thermochemical Treatment
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Powder Metallurgy and Metal Ceramics Aims and scope

Abstract

The formation of a structure during pressureless sintering of graphite-like boron nitride (BN) powders pretreated in detonation waves was studied. The treated powders contained 10–12% wurtzite BN phase and 2–3% sphalerite phase. During sintering at just 1200 °C a reverse transformation from dense BN phases to graphite-like phases and primary recrystallization of highly fragmented BNg occur as a result of the pretreatment. Accretive recrystallization of BNg begins at 1500 °C and at T=1700–1950 °C platy grains with a size of 1–3 µm are formed in the developed surface. At 1700 °C the density of the specimens reach 0.95 of the theoretical value. The specimens produced at 1950 °C have a higher compressive strength and radiation resistance than do those made without pretreatment.

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References

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Authors
  1. G. I. Savvakin
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  2. T. V. Dubovik
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  3. G. S. Oleinik
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Additional information

Deceased.

Institute of Materials Science, Ukrainian Academy of Science, Kiev. Translated from Poroshkovaya Metallurgiya, Nos. 5/6, pp. 75–80, May–June, 1995.

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Savvakin, G.I., Dubovik, T.V. & Oleinik, G.S. Structural studies of ceramics based on detonation-wave-treated graphite-like boron nitride. Powder Metall Met Ceram 34, 293–298 (1995). https://doi.org/10.1007/BF00560133

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  • DOI: https://doi.org/10.1007/BF00560133

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