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ZrB2 ceramics with MoSi2, SiC and B4C additives: compaction kinetics, phase formation and creep resistance

O.Grigoriev,
 
V.Vinokurov,
 
L. I. Klimenko,
 
N.Bega*
 

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Kyiv
mykolabega@gmail.com
Usp. materialozn. 2023, 7:113-118
https://doi.org/10.15407/materials2023.07.012

Abstract

A study was carried out of the processes of compaction, structure formation and mechanical properties of ceramics based on zirconium boride with sintering-activating additives of boron, silicon and chromium carbides, as well as molybdenum silicide, obtained under hot pressing conditions in a CO atmosphere. In ZrB2—18% (vol.) B4C ceramics, the use of the B4C additive reduces the optimal hot pressing temperature to 1940 °C and accelerates the compaction process of the ceramics. The influence of the sample preparation background on high-temperature creep has been established, as a result of which either plastic flow of the material occurs over a wide temperature range, or a high temperature threshold for yield and brittle fracture. In ZrB2—SiC ceramics, during high-temperature plastic deformation both during sintering and in creep tests, a bidisperse structure with a submicrograined component is formed, which is responsible for high creep rates. In ZrB2—B4C ceramics there is no submicrograin component, which provides high creep resistance up to 2000 °C. The phase composition of ZrB2—MoSi2 ceramics changes dramatically during hot pressing; it is represented by a composition of a ZrB2 solid solution with the second phases of SiC and B4C, and in terms of creep resistance it occupies an intermediate position between two other ceramics.


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HOT PRESSING IN A CO ATMOSPHERE, CREEP RESISTANCE, DENSIFICATION KINETICS, SILICON, BORON AND CHROMIUM CARBIDES, STRENGTH AT 20О С, STRUCTURE, ZIRCONIUM BORIDE

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