Microstructure and properties of C/C–ZrC composites prepared by hydrothermal deposition combined with carbothermal reduction

Li, Cuiyan; Li, Guibiao; Ouyang, Haibo; Huang, Jianfeng; Hou, Xianghui

doi:10.1016/j.jallcom.2018.01.148

Cited by 23 publications

(4 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…First of all, the curve after introducing PyC becomes smoother with slope of linear elastic stage declining, which indicates the decreases in modulus of composite. The modulus mismatch between the carbon fiber and the ZrC-SiC ceramic matrix has always been the noteworthy factor impairing the strengthening and toughening, and the PyC interface layer plays an important role in alleviating the modulus mismatch [48]. Secondly, after introducing the PyC interface layer, the strain corresponding to maximum stress increases from 1.35% to 1.5%-2%, which manifests the improvement of damage tolerance to some degree.…”

Section: Resultsmentioning

confidence: 99%

Using PyC modified 3D carbon fiber to reinforce UHTC under low temperature sintering without pressure

Cheng

Xun

et al. 2021

J Adv Ceram

View full text Add to dashboard Cite

Finding the optimum balance between strength and toughness, as well as acquiring reliable thermal shock resistance and oxidation resistance, has always been the most concerned topic in the discussion of ultra-high temperature ceramic composites. Herein, PyC modified 3D carbon fiber is used to reinforce ultra-high temperature ceramic (UHTC). The macroscopic block composite with large size is successfully fabricated through low temperature sintering at 1300 °C without pressure. The prepared PyC modified 3D Cf/ZrC-SiC composites simultaneously possess excellent physical and chemical stability under the synergistic effect of PyC interface layer and low temperature sintering without pressure. The fracture toughness is increased in magnitude to 13.05 ± 1.72 MPa·m1/2 accompanied by reliable flexural strength of 251 ± 27 MPa. After rapid thermal shock spanning from room temperature (RT) to 1200 °C, there are no visible surface penetrating cracks, spalling, or structural fragmentation. The maximum critical temperature difference reaches 875 °C, which is nearly three times higher than that of traditional monolithic ceramics. The haunting puzzle of intrinsic brittleness and low damage tolerance are resolved fundamentally. Under the protection of PyC interface layer, the carbon fibers around oxide layer and matrix remain structure intact after static oxidation at 1500 °C for 30 min. The oxide layer has reliable physical and chemical stability and resists the erosion from fierce oxidizing atmosphere, ensuring the excellent oxidation resistance of the composites. In a sense, the present work provides promising universality in designability and achievement of 3D carbon fiber reinforced ceramic composites.

show abstract

Section: Resultsmentioning

confidence: 99%

Using PyC modified 3D carbon fiber to reinforce UHTC under low temperature sintering without pressure

Cheng

Xun

et al. 2021

J Adv Ceram

View full text Add to dashboard Cite

show abstract

“…115 Figure 10B shows a closer view of the EPD-applied ZrB 2 coating on the C f, followed by a ZrB 2 /B 4 C matrix achieved via solvent-based slurry infiltration. 115 Another method used recently by Li et al 117 to prepare a C f -reinforced ZrC UHTCMC involves the combination of hydrothermal deposition and carbothermal reduction. Sucrose was employed as a carbon source, while ZrCl 4 was used for hydrothermal deposition, resulting in a ZrO 2 matrix.…”

Section: Hybrid Processesmentioning

confidence: 99%

“…The reduction of ZrO 2 resulted in a dispersion of submicron ZrC (100-300 nm) in the matrix. 117 The carbon layer from the sucrose on the fibers both hindered damage during the carbothermal reduction and served as an interfacial layer, resulting in fiber pullout during bend testing. 117 These are some of the examples of the success of hybrid processing techniques for creating UHTCMCs with denser matrices and more robust fiber fidelity, and in a faster/more cost-effective manner than what can be achieved with a single processing technique.…”

Section: Hybrid Processesmentioning

confidence: 99%

Processing of fiber‐reinforced ultra‐high temperature ceramic composites: A review

Rueschhoff

Carney

Apostolov

et al. 2019

Int J Ceramic Engine & Sci

View full text Add to dashboard Cite

Ultra-high temperature ceramics (UHTCs) have emerged as promising materials for high-temperature aerospace applications due to their high melting temperature and superior ablation performance. Even still, they have yet to reach their full potential due to the catastrophic brittle failure that typically accompanies the intrinsic low fracture toughness of ceramic materials. Therefore, the emerging field of UHTC ceramic matrix composites (UHTCMCs) offers the toughness benefits of a composite with the high temperature stability of UHTCs. Here, we outline work in the last decade on the processing of UHTCs with a reinforcing fiber phase for enhanced fracture toughness. Included are fibers of both carbon and silicon carbide composition in both continuous and chopped fiber lengths. Particular emphasis is given to emerging research from the last few years to highlight novel developments. K E Y W O R D Sceramic matrix composites, ceramic processing, ultra-high temperature ceramics How to cite this article: Rueschhoff LM, Carney CM, Apostolov ZD, Cinibulk MK. Processing of fiber-reinforced ultra-high temperature ceramic composites: A review.

show abstract

“…However, carbides play a more important role than nitrides in strengthening grain boundaries due to the difference in the segregation ability . Segregation of elements can not only increase k but also reduce the critical grain size in the Hall–Petch relationship, resulting in an inverse Hall–Petch relationship (yield strength decreases with diminished grain size, contrary to the regular Hall–Petch relationship, due to the transformation of the mechanism of plastic deformation for smaller grain sizes). The increase of the secondary phase may also abate k .…”

Section: Introductionmentioning

confidence: 99%

Hall–Petch Relationship in Electrically Pulsed Al–Zn–Mg Alloys

Zhang

2019

Adv Eng Mater

View full text Add to dashboard Cite

Al-Zn-Mg solid solution alloys with average grain sizes of 18, 30, and 100 μm are obtained by a warm rolling-solution treatment. Based on the Hall-Petch and the Bailey-Hirsch relations, an inverse proportional model between dislocation density and grain size is proposed under the same plastic strain for nonpulsed alloys. The proportional coefficient is a function of the Hall-Petch slope k. The Hall-Petch relationship under different pulse parameters and heating conditions are obtained by controlling the temperature increase for samples using air cooling. The contribution ratio of drifting electrons (excluding Joule heating) to the variation of k is derived for different current densities. The divergence between the softening action of drifting electrons and Joule heating is discovered; i.e., drifting electrons are more inclined to lead to grain boundary softening than intragranular softening, whereas Joule heating has no obvious bias for either type of softening. Through mathematical derivation and experimental verification, it is found that the amount of dislocation reduction caused by an electric pulse has a negative correlation with grain size, leading to a change in k, which is of great significance to the theoretical development of electric pulse-assisted formation.

show abstract

Microstructure and properties of C/C–ZrC composites prepared by hydrothermal deposition combined with carbothermal reduction

Cited by 23 publications

References 29 publications

Using PyC modified 3D carbon fiber to reinforce UHTC under low temperature sintering without pressure

Using PyC modified 3D carbon fiber to reinforce UHTC under low temperature sintering without pressure

Processing of fiber‐reinforced ultra‐high temperature ceramic composites: A review

Hall–Petch Relationship in Electrically Pulsed Al–Zn–Mg Alloys

Contact Info

Product

Resources

About