Oxidation of ZrB2–SiC ultra-high temperature composites over a wide range of SiC content

Williams, Peter A.; Sakidja, Ridwan; Perepezko, John H.; Ritt, Patrick

doi:10.1016/j.jeurceramsoc.2012.05.021

Cited by 91 publications

(59 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, ZrSiO 4 not only has low permeability for oxygen and high thermal stability at high temperature, but also can reduce the consumption of SiO 2 and to a large extent improve the oxidation resistance ability of ceramics [5][6][7]. Owing to these advantages, introducing UHTCs into coating is considered to be a promising solution to the poor oxidation resistance of C/C composites.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and microstructure of ZrB2–ZrC–SiC coatings on C/C composites by reactive melt infiltration using ZrSi2 alloy

Xue

Zhou

et al. 2018

J Adv Ceram

View full text Add to dashboard Cite

ZrB 2 -ZrC-SiC ternary coatings on C/C composites are investigated by reactive melt infiltration of ZrSi 2 alloy into pre-coatings. Two different pre-coating structures, including porous B 4 C-C and dense C/B, are designed by slurry dip and chemical vapor deposition (CVD) process respectively. The coating prepared by reactive melt infiltration (RMI) into B 4 C-C presents a flat and smooth surface with a three-layer cross-sectional structure, namely interior SiC transition layer, gradient ZrB 2 -ZrC-SiC layer, and ZrB 2 -ZrC exterior layer. In comparison, the coating prepared by RMI into C/B shows a more granular surface with a different three-layer cross-sectional structure, interior unreacted B-C pre-coating layer, middle SiC layer, and exterior ZrB 2 -ZrC-ZrSi 2 layer. The forming mechanisms of the specific microstructures in two coatings are also investigated and discussed in detail.

show abstract

Section: Introductionmentioning

confidence: 99%

Fabrication and microstructure of ZrB2–ZrC–SiC coatings on C/C composites by reactive melt infiltration using ZrSi2 alloy

Xue

Zhou

et al. 2018

J Adv Ceram

View full text Add to dashboard Cite

show abstract

“…In order to improve the oxidation resistance of ZrB 2 , a number of additives have been tested, including Al+B, Zr+Si, TaSi 2 and SiC 5,10,15,16 . Of these, SiC was found to provide the greatest enhancement to the oxidation resistance under almost all conditions due to the formation of a borosilicate layer 7,10,14,17 .…”

Section: Oxidation Behavior Of Zrb 2 -Based Materialsmentioning

confidence: 99%

“…Specimens were oxidized for a pre-determined time under flowing standard lab grade 16 O 2 (GTS-Wilco, Allentown, PA) as described above. Then the specimen was cooled to room temperature, which happens rapidly once the current flow ceases, and the gas flow was turned off.…”

Section: Double Oxidationmentioning

confidence: 99%

“…A baseline exposure was performed using 16 O 2 for both oxidation stages to show that normal oxidation behavior was observed when the specimen was heated twice ( Figure 13). The 18 O 2 tracer exposures performed are listed in Table 2.…”

Section: Double Oxidationmentioning

confidence: 99%

“…Spatial resolution mode has a resolution between ~3nm to 0.5µm without fine tuning, and was used to map the location of the ions of interest. For the specimens analyzed in this work, positive mode was used to collect Zr, Si, and B, while negative mode was used to collect C, 16 Limitations of the ToF-SIMS technique include the requirement for a flat specimen to obtain data as surface roughness leads to regions with low ion signal. Avoiding epoxy in specimen mounting and polishing is also beneficial as epoxy can lead to specimen charging.…”

Section: Double Oxidationmentioning

confidence: 99%

See 2 more Smart Citations

Oxidation Behavior of Zirconium Diboride Silicone Carbide Based Materials at Ultra-High Temperatures

Shugart

View full text Add to dashboard Cite

ZrB 2 -SiC is of high interest for Thermal Protection Systems (TPS) for future hypersonic vehicles. Both ZrB 2 and its oxidation product, ZrO 2 , possess high melting temperatures (T m =3245°C and 2715°C respectively) needed for this application. SiC is added to improve the oxidation resistance. However, the oxidation resistance of ZrB 2 -SiC at ultra-high temperatures is poor and the oxidation mechanisms are not well understood. The aim of this work was to perform a quantitative study of the oxidation behavior in order to improve life prediction.The oxidation behavior of ZrB 2 -30 vol% SiC was studied using two oxidation procedures. A box furnace was used to oxidize specimens for times between 30 seconds and 100 hours at temperatures of 1300°-1550°C in stagnant air. For ultra-high temperature testing, a resistive heating system was designed and built, which allowed oxidation at temperatures of 1300°-1800°C for times between 5 and 70 minutes in controlled oxygen atmospheres. Oxidation was quantified by measuring mass change and oxidation product layer thicknesses. A combination of scanning electron microscopy, energy dispersive spectroscopy, x-ray diffraction, x-ray photoelectron spectroscopy, inductively coupled plasma optical emission spectrometry, and time of flight secondary ion mass spectrometry was used to characterize the oxidation products.Two oxidation regimes were identified; 1) low temperature oxidation below 1627°C and 2) high temperature oxidation at and above 1627°C. Low temperature oxidation exhibited a twolayer oxide, which consisted of a borosilicate glass layer above a ZrO 2 +C layer. Key findings indicate that oxygen transport in both zirconia and borosilicate glass must be considered in modeling the low temperature oxidation behavior of ZrB 2 -30 vol% SiC. In addition composition and thickness variations of the borosilicate glass layer must also be considered. ivThe transition between the low and high temperature oxidation regimes is attributed to a change in the thermodynamically favored oxidation products, considering a locally SiC-rich microstructure. High temperature oxidation, T≥ 1627°C, resulted in formation of three oxidation product layers. A borosilicate glass layer was found above a layer with ZrO 2 and borosilicate glass. Beneath these was a porous layer of ZrB 2 resulting from SiC depletion due to active oxidation to SiO(g). Key findings indicate that the oxidation rate is much more rapid in this oxidation regime, that the SiC depletion layer growth is best explained by parabolic gas phase diffusion in the porous layer, and again, oxygen transport in both zirconia and borosilicate glass must be considered in modeling the high temperature oxidation behavior of ZrB 2 -30 vol% SiC.This work provided a quantitative analysis of the oxidation kinetics of ZrB 2 -30 vol% SiC.The thermodynamic and kinetic analyses of the two distinct oxidation regimes of ZrB 2 -30 vol% SiC enable improved life prediction.v

show abstract

Oxidation Behavior at 1600 °C of Si‐SiC‐ZrB₂ Composites Produced by Si Reactive Infiltration

et al. 2013

View full text Add to dashboard Cite

Si–SiC–ZrB2 are produced by the reactive infiltration with molten silicon in porous SiC–C–ZrB2 preforms. It is observed that oxidized Si–SiC–ZrB2 ceramics present a layered structure composed of an outer layer of silica and a borosilicate glass intermediate layer with ZrO2 particles and the unoxidized bulk material. The graphs show that the passivation is very effective already after 5 min of oxidation. The thermograms do not vary significantly when the oxidation times are increased.

show abstract

Oxidation of ZrB2–SiC ultra-high temperature composites over a wide range of SiC content

Cited by 91 publications

References 27 publications

Fabrication and microstructure of ZrB2–ZrC–SiC coatings on C/C composites by reactive melt infiltration using ZrSi2 alloy

Fabrication and microstructure of ZrB2–ZrC–SiC coatings on C/C composites by reactive melt infiltration using ZrSi2 alloy

Oxidation Behavior of Zirconium Diboride Silicone Carbide Based Materials at Ultra-High Temperatures

Oxidation Behavior at 1600 °C of Si‐SiC‐ZrB₂ Composites Produced by Si Reactive Infiltration

Contact Info

Product

Resources

About

Oxidation of ZrB2–SiC ultra-high temperature composites over a wide range of SiC content

Cited by 91 publications

References 27 publications

Fabrication and microstructure of ZrB2–ZrC–SiC coatings on C/C composites by reactive melt infiltration using ZrSi2 alloy

Fabrication and microstructure of ZrB2–ZrC–SiC coatings on C/C composites by reactive melt infiltration using ZrSi2 alloy

Oxidation Behavior of Zirconium Diboride Silicone Carbide Based Materials at Ultra-High Temperatures

Oxidation Behavior at 1600 °C of Si‐SiC‐ZrB2 Composites Produced by Si Reactive Infiltration

Contact Info

Product

Resources

About

Oxidation Behavior at 1600 °C of Si‐SiC‐ZrB₂ Composites Produced by Si Reactive Infiltration