Oxidation behaviour of an aluminium nitride–hafnium diboride ceramic composite

Mattia, Davide; Desmaison-Brut, Martine; Dimovski, Svetlana; Gogotsi, Yury; Desmaison, J.

doi:10.1016/j.jeurceramsoc.2004.12.011

Cited by 15 publications

(4 citation statements)

References 15 publications

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“…Data reported in previous studies consider ZrC oxidation in the form of powder [7][8][9], sintered pellet [10][11][12][13] and single crystal [14,15] under many different conditions. What is understood and well reported regarding ZrC oxidation is that ZrC is susceptible to rapid oxidation at high temperatures (T Z 870 K) [16] and that the mechanism of formation of the oxide occurs with the typical ''Maltese cross'' shape [17], previously reported for other carbides and borides of group IV, V, VI of the transitions metals [18][19][20][21]. However, an overall model describing the controlling mechanism is difficult to achieve as ZrC oxidation is strongly affected by a range of parameters and previous studies show limited experimental data in overlapping parameter ranges [16].…”

Section: Introductionmentioning

confidence: 99%

Zirconium Carbide Oxidation: Maltese Cross Formation and Interface Characterization

et al. 2016

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Oxidation of dense hot-pressed ZrC specimens from 1073 to 1473 K was investigated using an in situ technique: HT-ESEM. Cuboid specimens were monitored on the surface and on edges and corners during oxidation in order to understand the influence of crack formation and propagation on the Maltese cross shape development of the oxide. The oxidation mechanism comprised three steps: (1) delamination of sample edges, (2) crack formation at corners and (3) crack propagation towards the inner core and formation of microcracks parallel to the interface that increase the accessible surface area followed by a drastic volume expansion. The microcrack pattern is found to be repetitive as if a cyclic debonding of the interface occurred. Characterization of the interface by TEM and HRTEM revealed 123Oxid Met (2017) 88:509-519 DOI 10.1007 the interface between ZrC and ZrO 2 to comprise a 2 lm thick amorphous carbon matrix with ZrO 2 nanocrystals embedded in it.

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Section: Introductionmentioning

confidence: 99%

Zirconium Carbide Oxidation: Maltese Cross Formation and Interface Characterization

et al. 2016

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“…Earlier studies focusing on the fabrication of composites like Al 2 O 3 /BN [8][9][10], AlON/BN [11,12], AlN/B 2 O 3 [13], AlN/HfB 2 [14], and AlN/TiB 2 [15], have noted that aluminum borate whiskers can form from the reaction between alumina and boria starting at temperatures of 1000 °C. Thus, we expect whiskers to also be detected in AlN/BN composites exposed to elevated temperatures in oxidizing environments.…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

Oxidation resistance of AlN/BN via mullite-type Al18B4O33

Chari

Faber

2022

Journal of the European Ceramic Society

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“…пающую в качестве эффективного диффузионного барьера, защищающего от проникновения кислорода. Однако при температурах выше 1100 °C оксид бора начинает испаряться [3][4][5], а свыше 1500 °C давление пара B 2 O 3 над поверхностью резко снижается, процесс испарения интенсифицируется, что приводит к увеличению скорости окисления. С ростом температуры окисления HfB 2 происходит образование газообразного оксида бора BO 2 и низших оксидов B 2 O 2 , BO и B 2 O [6].…”

Section: Introductionunclassified

Heterophase ceramics in the Hf–Si–Mo–B system obtained by a combination of SHS and hot pressing methods

Pogozhev

Лемешева

Potanin

et al. 2019

Izv.VUZ. Tsvet. Met.

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The paper focuses on obtaining heterophase powder ceramics and consolidated ceramics based on borides and silicides of hafnium and molybdenum by combining the methods of self-propagating high-temperature synthesis (SHS) and hot pressing (HP). Composite ceramic SHS powders HfB2–HfSi2–MoSi2 were obtained according to the scheme of magnesium-thermal reduction from oxide raw materials where the combustion wave is characterized by temperatures of 1750–2119 K and high mass combustion rates of 8,4– 9,3 g/s. The structure of synthesized SHS powders consists of relatively large MoSi2 grains up to 10 μm in size and submicron elongated HfB2 grains located mainly inside the MoSi2 grains and rounded Si precipitates. The composition with a lower concentration of boron contains a large number of polyhedral HfSi2 grains with a size of less than 10 μm. The resulting powders are characterized by an average particle size of ~6 μm with a maximum size up to 26 μm. Phase compositions of ceramics consolidated by the HP method and SHS synthesized powders are identical. The microstructure of compact samples consists of faceted HfB2 elongated grains 0,5– 10,0 μm in size, polyhedral HfSi2 and MoSi2 grains up to 8–10 μm in size and silicon interlayers. Consolidated ceramics has a high structural and chemical homogeneity, low residual porosity of 1,1–1,7 %, high hardness of 11,7–12,6 GPa and thermal conductivity of 62–87 W/(m·K).

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Oxidation behaviour of an aluminium nitride–hafnium diboride ceramic composite

Cited by 15 publications

References 15 publications

Zirconium Carbide Oxidation: Maltese Cross Formation and Interface Characterization

Zirconium Carbide Oxidation: Maltese Cross Formation and Interface Characterization

Oxidation resistance of AlN/BN via mullite-type Al18B4O33

Heterophase ceramics in the Hf–Si–Mo–B system obtained by a combination of SHS and hot pressing methods

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