Effects of ZrB2 and SiC dual addition on the oxidation resistance of graphite at 1600–2000°C

Gao, Zenghua; Xu, Jingjun; Zhang, Zhongwei; Qian, Yuhai; Li, Meishuan

doi:10.1016/j.corsci.2013.06.041

Cited by 35 publications

(4 citation statements)

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“…Table 2 presents the linear and mass ablation rates of the samples after ablation. The rate of ablation could be controlled by the oxidation reactions of C [30,31], ZrC [31], SiC [32][33][34][35][36], HfB 2 [37] and the diffusion of oxygen through the surface [38]. The linear and mass ablation rates of the samples showed possess similar variations [39].…”

Section: Resultsmentioning

confidence: 94%

Ablation properties of ZrC-SiC-HfB₂ ceramic with different amount of carbon fiber under an oxyacetylene flame

Shojaie-Bahaabad

Hasani-Arefi

2020

Mater. Res. Express

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In the present work, a carbon fiber reinforced ZrC-20 vol% SiC-15 vol% HfB 2 composite was produced by pressureless sintering method. Carbon fiber with various weight percentages (0, 10, 20, 30) was added to the milled ZrC-SiC-HfB 2 . The mixed powders were pressed and sintered at 2200°C for 2 h. The microstructure and mechanical properties of the specimens were investigated by Scanning Electron Microscope (SEM) equipped with EDS spectroscopy, XRD analysis and hardness and toughness tests. The ablation resistance of the composites was performed by oxyacetylene torch. The results showed that as the carbon fiber content was increased, the porosity and toughness were increased as well, while the hardness and density were decreased. During the ablation test, the outer surface of the composite underwent a sintering process and formed a dense layer of Zr-Hf-Si-O on the surface. ZrSiO 4 and HfSiO 4 were also created after cooling, so these phases played a pinning effect and prevented the crack propagation. The results also showed that linear and mass ablation rates were increased with increasing the weight percentage of the carbon fiber. SEM analysis with EDS further revealed that with increasing the carbon content, the defects in the formed oxide layer on the composite surface were increased due to the evaporation of SiO 2 and the decrease in the pinning effect of ZrSiO 4 and HfSiO 4 phases as well as the phase transformation of the remained ZrO 2 and HfO 2 . As a result, as the carbon fiber was increased, the ablation resistance of the composite was decreased.

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Section: Resultsmentioning

confidence: 94%

Ablation properties of ZrC-SiC-HfB₂ ceramic with different amount of carbon fiber under an oxyacetylene flame

Shojaie-Bahaabad

Hasani-Arefi

2020

Mater. Res. Express

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“…It can be found that the volume percentage of ZrB 2 and SiC in the composites was 5.71 % and 5.6 % respectively, and the open porosity was 16.08 %. The volume percentage of ZrB 2 and SiC ceramic in the composites is low due to the low ceramic productivity of ZrB 2 precursor (29.7 %), the agglomeration of ZrB 2 particles and hindrance of PCS infiltration [18].…”

Section: Microstructure and Composition Of C/c-zrb 2 -Sic Compositesmentioning

confidence: 98%

“…Zirconium diboride (ZrB 2 ) refractory ceramics is one of the most interesting thermal shielding materials due to its extremely high melting point (3523 K), relatively low density (～6.09 g/cm 3 ), high hardness and good high temperature strength [11,12]. By adding SiC ceramics, the oxidation resistance and high temperature strength of ZrB 2 -based ceramics can be further increased [13][14][15][16]. But most of the work focused on improving the ablation resistance of C/ZrB 2 -SiC composites in the previous research [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and oxidation behavior of C/C–ZrB 2 –SiC composites coated with SiC coating at high temperature

et al. 2015

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“…However, high temperature oxidation resistance of matrix modification is limited. 8 Coating has been proven to be an effective method for protecting underlying material in many fields. [9][10][11][12] Silicon based ceramic coatings, especially SiC coating, have been widely used for the protection of C/C composites at high temperature.…”

Section: Introductionmentioning

confidence: 99%

Oxidation behaviour of SiC coated C/C–ZrC–ZrB₂–SiC composites in wind tunnel at 1600°C

Zhang

Zhuang

et al. 2015

Surface Engineering

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SiC coating was prepared on the surface of C/C-ZrC-ZrB 2 -SiC composites by chemical vapour deposition (CVD). The microstructures and phase compositions were characterised by scanning electron microscopy and X-ray diffraction respectively. The CVD SiC coating exhibited a dense structure with a thickness of 30-40 mm. Oxidation behaviour of the coated sample was studied in a wind tunnel at 1600uC. Thermogravimetric analysis of C/C-ZrC-ZrB 2 -SiC was measured. The results show that the coated sample fractured after being exposed in the wind tunnel for 21 h. The failure of the SiC coating is attributed to excessive local stress caused by the change of thermal expansion coefficient, resulting in the generation of cracks and holes. Once the failure of SiC coating appears, the fracture would not happen quickly due to the addition of ceramics (ZrC, ZrB 2 , SiC), which could promote the oxidation resistance performance and increase the stability of C/C composites in complicated service condition.

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Effects of ZrB2 and SiC dual addition on the oxidation resistance of graphite at 1600–2000°C

Cited by 35 publications

References 35 publications

Ablation properties of ZrC-SiC-HfB₂ ceramic with different amount of carbon fiber under an oxyacetylene flame

Ablation properties of ZrC-SiC-HfB₂ ceramic with different amount of carbon fiber under an oxyacetylene flame

Microstructure and oxidation behavior of C/C–ZrB 2 –SiC composites coated with SiC coating at high temperature

Oxidation behaviour of SiC coated C/C–ZrC–ZrB₂–SiC composites in wind tunnel at 1600°C

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Effects of ZrB2 and SiC dual addition on the oxidation resistance of graphite at 1600–2000°C

Cited by 35 publications

References 35 publications

Ablation properties of ZrC-SiC-HfB2 ceramic with different amount of carbon fiber under an oxyacetylene flame

Ablation properties of ZrC-SiC-HfB2 ceramic with different amount of carbon fiber under an oxyacetylene flame

Microstructure and oxidation behavior of C/C–ZrB 2 –SiC composites coated with SiC coating at high temperature

Oxidation behaviour of SiC coated C/C–ZrC–ZrB2–SiC composites in wind tunnel at 1600°C

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Ablation properties of ZrC-SiC-HfB₂ ceramic with different amount of carbon fiber under an oxyacetylene flame

Ablation properties of ZrC-SiC-HfB₂ ceramic with different amount of carbon fiber under an oxyacetylene flame

Oxidation behaviour of SiC coated C/C–ZrC–ZrB₂–SiC composites in wind tunnel at 1600°C