The peculiarities in oxidation behavior of the ZrB2-SiC ceramics with chromium additive

D. Bannykh; A. Utkin; N. Baklanova

doi:10.1016/j.ijrmhm.2019.105023

The peculiarities in oxidation behavior of the ZrB₂-SiC ceramics with chromium additive

D. Bannykh, A. Utkin, N. Baklanova

Department of Natural Sciences

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

ZrB₂-SiC-Cr powder sintering at 1600 °C and its oxidation behavior at 1000–1500 °C in air were studied as a function of chromium content. It was shown that the relative density of the ZrB₂-SiC ceramics increases with an increase in chromium content in the powdered mixture. This is related to the formation of the liquid Cr-Si-C-B phase during the high-temperature interaction of SiC with chromium and ZrB₂. It was stated that the mechanism of ZrB₂-SiC-Cr ceramics oxidation is changed from bulk to passive. The oxidation resistance is improved for the ceramics with 13% of chromium or less, which can be explained by a decrease in its porosity. The ceramics with higher chromium content demonstrates the opposite effect, namely, large-size Cr₂O₃ crystals are formed during oxidation, this promotes microcracking in the oxidizing layer and causes damage of surface integrity. As a result, the oxidation resistance of the ZrB₂-SiC-Cr ceramics with high chromium content is decreased.

Original language	English
Article number	105023
Number of pages	8
Journal	International Journal of Refractory Metals and Hard Materials
Volume	84
DOIs	https://doi.org/10.1016/j.ijrmhm.2019.105023
Publication status	Published - 1 Nov 2019

Keywords

Borides
Chromium
Oxidation
Silicon carbide
Sintering
Thermal properties
DENSIFICATION
TEMPERATURE
KINETICS
MICROSTRUCTURE
HFB2

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title = "The peculiarities in oxidation behavior of the ZrB2-SiC ceramics with chromium additive",

abstract = "ZrB2-SiC-Cr powder sintering at 1600 °C and its oxidation behavior at 1000–1500 °C in air were studied as a function of chromium content. It was shown that the relative density of the ZrB2-SiC ceramics increases with an increase in chromium content in the powdered mixture. This is related to the formation of the liquid Cr-Si-C-B phase during the high-temperature interaction of SiC with chromium and ZrB2. It was stated that the mechanism of ZrB2-SiC-Cr ceramics oxidation is changed from bulk to passive. The oxidation resistance is improved for the ceramics with 13% of chromium or less, which can be explained by a decrease in its porosity. The ceramics with higher chromium content demonstrates the opposite effect, namely, large-size Cr2O3 crystals are formed during oxidation, this promotes microcracking in the oxidizing layer and causes damage of surface integrity. As a result, the oxidation resistance of the ZrB2-SiC-Cr ceramics with high chromium content is decreased.",

keywords = "Borides, Chromium, Oxidation, Silicon carbide, Sintering, Thermal properties, DENSIFICATION, TEMPERATURE, KINETICS, MICROSTRUCTURE, HFB2",

author = "D. Bannykh and A. Utkin and N. Baklanova",

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AU - Bannykh, D.

AU - Utkin, A.

AU - Baklanova, N.

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Y1 - 2019/11/1

N2 - ZrB2-SiC-Cr powder sintering at 1600 °C and its oxidation behavior at 1000–1500 °C in air were studied as a function of chromium content. It was shown that the relative density of the ZrB2-SiC ceramics increases with an increase in chromium content in the powdered mixture. This is related to the formation of the liquid Cr-Si-C-B phase during the high-temperature interaction of SiC with chromium and ZrB2. It was stated that the mechanism of ZrB2-SiC-Cr ceramics oxidation is changed from bulk to passive. The oxidation resistance is improved for the ceramics with 13% of chromium or less, which can be explained by a decrease in its porosity. The ceramics with higher chromium content demonstrates the opposite effect, namely, large-size Cr2O3 crystals are formed during oxidation, this promotes microcracking in the oxidizing layer and causes damage of surface integrity. As a result, the oxidation resistance of the ZrB2-SiC-Cr ceramics with high chromium content is decreased.

AB - ZrB2-SiC-Cr powder sintering at 1600 °C and its oxidation behavior at 1000–1500 °C in air were studied as a function of chromium content. It was shown that the relative density of the ZrB2-SiC ceramics increases with an increase in chromium content in the powdered mixture. This is related to the formation of the liquid Cr-Si-C-B phase during the high-temperature interaction of SiC with chromium and ZrB2. It was stated that the mechanism of ZrB2-SiC-Cr ceramics oxidation is changed from bulk to passive. The oxidation resistance is improved for the ceramics with 13% of chromium or less, which can be explained by a decrease in its porosity. The ceramics with higher chromium content demonstrates the opposite effect, namely, large-size Cr2O3 crystals are formed during oxidation, this promotes microcracking in the oxidizing layer and causes damage of surface integrity. As a result, the oxidation resistance of the ZrB2-SiC-Cr ceramics with high chromium content is decreased.

KW - Borides

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KW - Silicon carbide

KW - Sintering

KW - Thermal properties

KW - DENSIFICATION

KW - TEMPERATURE

KW - KINETICS

KW - MICROSTRUCTURE

KW - HFB2

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