Oxidation Behaviors of C–ZrB2–SiC Composite at 2100 °C in Air and O2

Zhang, Zhongwei; Nan, Ce‐Wen; Xu, Jingjun; Gao, Zenghua; Li, Meishuan; Wang, Junshan

doi:10.1016/j.jmst.2014.04.013

Cited by 14 publications

(3 citation statements)

References 20 publications

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“…On the contrary, few graphite flakes could be found in the mixed layers of the specimens that were tested in air, as shown in Figure 7. These differences could be ascribed to the different atmospheres and the severe oxidation of graphite flakes that was experienced in air at a temperature over 500 • C [8]. The pores vanished due to the growth of ZrO 2 grains and the solidified borosilicate being dispersed between these grains.…”

Section: Surface Analysismentioning

confidence: 99%

“…Zirconium diboride (ZrB 2 ) is an important member of ultrahigh-temperature ceramics (UHTCs) [1] that has been extensively used as wing leading edges, nose-caps and propulsion system components in space vehicles due to its excellent thermal, mechanical, and chemical properties, such as its high melting point (>3000 • C), high electrical and thermal conductivity, high corrosion resistance, and chemical stability [2][3][4][5][6][7][8][9][10]. Among these properties, thermal shock resistance (TSR) is of vital importance, as most nose-cap, leading edge and aero-engine applications re inevitably subjected to thermal shock, such as the sudden temperature change by high-speed friction with air.…”

Section: Introductionmentioning

confidence: 99%

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Repeated Thermal Shock Behavior of ZrB2–SiC–Graphite Composite under Pre-Stress in Air and Ar Atmospheres

et al. 2020

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The thermo–chemo–mechanical coupling on the thermal shock resistance of 20 vol%-ZrB2–15 vol%-SiC–graphite composite is investigated with the use of a self-developed material testing system. In each test, a specimen under prescribed constant tensile pre-stress (σ0 = 0, 10, 20 and 30 MPa) was subjected to 60 cycles of thermal shock. In each cycle, the specimen was heated from room temperature to 2000 °C within 5 s in an air atmosphere or an Ar atmosphere. The residual flexural strength of each specimen was tested, and the fracture morphology was characterized by using scanning electron microscopy (SEM). There were three different regions in the fracture surface of a specimen tested in the air, while no such difference could be observed in the fracture surfaces of the specimens that were tested in Ar. The residual flexural strength of the composite that was tested in Ar generally decreases with the increase of σ0. However, in the range of 0 ≤ σ0 ≤ 10 MPa, the residual flexural strength of the composite that was tested in the air ascended with the increase of σ0 due to the healing effect of oxidation, but it descended thereafter with a further increase of σ0, as the effect pre-stress that became prominent.

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Section: Surface Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Repeated Thermal Shock Behavior of ZrB2–SiC–Graphite Composite under Pre-Stress in Air and Ar Atmospheres

et al. 2020

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“…Therefore, serious mechanical denudation will take place under high speed oxyacetylene flame and particles, leading to high depletion of the coating. In view of the above problem, some researchers proposed using a thermal evaporation method and in situ reaction to prepare ZrC-SiC biphasic coating [27], inhibiting the mechanical denudation efficaciously. Nevertheless, this method has high cost, higher preparation temperature, and complex steps.…”

Section: Introductionmentioning

confidence: 99%

A New Assistant Method for Characterizing Ablation Resistance of ZrC-SiC Dispersive Biphasic Coating on C/C Composites

Feng

Yao

et al. 2019

Coatings

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To optimize the ablation resistance of ZrC coating, ZrC-SiC dispersive biphasic coating was prepared by chemical vapor co-deposition. The ablation resistances of the coatings were carried out by oxyacetylene flame tests. Compared with double-layered ZrC/SiC coating, the ablation resistance of ZrC-SiC coating was evaluated. On the basis of similar mass ablation rates of the two coatings, a new assistant method for characterizing the thermal protecting effect of coatings on carbon-carbon composites (C/C) composites was proposed. The thermal protecting ability of the coating was accurately reflected by the changes of hardness and elastic modulus of C/C substrate below the central region of ablated coatings before and after ablation. The ablation processes of two kinds of coatings were also discussed. The results showed that the hardness and elastic modulus of the C/C substrate protected by ZrC-SiC coating were higher than that of C/C coated with ZrC/SiC coating. The result convincingly illustrated the thermal protecting ability of ZrC-SiC coating was much better than that of ZrC/SiC coating, which attributed to the formation of Zr-Si-O glass.

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Combustion synthesis of ZrB2-TaB2-TaSi2 ceramics with microgradient grain structure and improved mechanical properties

Vorotilo

Левашов

Петржик

et al. 2019

Ceramics International

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Oxidation Behaviors of C–ZrB2–SiC Composite at 2100 °C in Air and O2

Cited by 14 publications

References 20 publications

Repeated Thermal Shock Behavior of ZrB2–SiC–Graphite Composite under Pre-Stress in Air and Ar Atmospheres

Repeated Thermal Shock Behavior of ZrB2–SiC–Graphite Composite under Pre-Stress in Air and Ar Atmospheres

A New Assistant Method for Characterizing Ablation Resistance of ZrC-SiC Dispersive Biphasic Coating on C/C Composites

Combustion synthesis of ZrB2-TaB2-TaSi2 ceramics with microgradient grain structure and improved mechanical properties

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