The effect of microstructural evolution on micromechanical behavior of pyrolytic carbon after heat treatment

Published on Mar 1, 2020in Diamond and Related Materials2.65
· DOI :10.1016/J.DIAMOND.2020.107729
Tiyuan Wang5
Estimated H-index: 5
(NPU: Northwestern Polytechnical University),
Hejun Li68
Estimated H-index: 68
(NPU: Northwestern Polytechnical University)
+ 2 AuthorsWei Li99
Estimated H-index: 99
(NPU: Northwestern Polytechnical University)
Sources
Abstract
Abstract In order to investigate the effect of microstructural evolution on the micromechanical behavior of pyrolytic carbon (PyC), the microstructural parameters and evolution of high texture (HT) and medium texture (MT) PyC after heat treatment from 1600 °C to 2450 °C were studied comparatively. The micro-indentation test was also performed to reveal the micromechanics. In terms of microstructure, after heat treatment, the HT matrix was directly delaminated into many nano-layers accompanied by multiple microcracks, while the MT matrix was delaminated into micro-layers including lots of cracks. Meanwhile, numerous nanopores were still observed in the MT matrix after heat treatment at 2450 °C. The interfaces of two textures became smoother and wider, and the width of HT interface was narrower than that of MT at different heat treatment temperatures. Moreover, the increasing tendency of the basal plane length (La) and the height of layered stacking (Lc) of HT were greater than those of MT as HT PyC contained more C C bonds than MT PyC. The micro-indentation results showed that the indentation depth of HT was always deeper than that of MT, and the corresponding micro-hardness and elastic modulus of MT were also greater than that of HT after different temperature treatment.
📖 Papers frequently viewed together
20158.82Carbon
3 Authors (Huixing Zhang, ..., Ping Xiao)
22 Citations
3 Authors (Jun Wu, ..., Hui-Ming Cheng)
3 Citations
7 Citations
References40
Newest
#1Xuemin Yin (NPU: Northwestern Polytechnical University)H-Index: 11
#2Hejun Li (NPU: Northwestern Polytechnical University)H-Index: 68
Last. Qiang Song (NPU: Northwestern Polytechnical University)H-Index: 26
view all 10 authors...
Abstract Ultralight, flexible and high-performance electromagnetic-interference (EMI) shielding performance materials are urgently required in the areas of aircraft/aerospace, portable and wearable smart electronics. Benefiting from the outstanding properties of graphene and the unique architectures, 3D assembled graphene structures have been widely applied in the field of EMI-shielding. Herein, for the first time, using Si3N4 nanowires as self-sacrificial templates with the thermal decompositio...
36 CitationsSource
#1Qingliang Shen (NPU: Northwestern Polytechnical University)H-Index: 11
#2Qiang Song (NPU: Northwestern Polytechnical University)H-Index: 26
Last. Wei Li (NPU: Northwestern Polytechnical University)H-Index: 99
view all 7 authors...
Abstract Fatigue strengthening of composites refers to the increase of residual strength after a specific number of loading cycles. This eccentric behavior widely exists in carbon/carbon composites and some ceramic matrix composites while few reasonable mechanisms have been proposed. In the present work, a comparative study of two different types of C/C composites (CNT-C/C with enhanced fiber-matrix interface and SiCNW-C/C composites with strengthened matrix) is performed to probe into the inher...
9 CitationsSource
#1Qiang Song (NPU: Northwestern Polytechnical University)H-Index: 26
#2Huibo Yan (NPU: Northwestern Polytechnical University)H-Index: 4
Last. Bingqing Wei (NPU: Northwestern Polytechnical University)H-Index: 96
view all 13 authors...
90 CitationsSource
#1Xujiang Chao (NPU: Northwestern Polytechnical University)H-Index: 8
#2Lehua Qi (NPU: Northwestern Polytechnical University)H-Index: 26
Last. Hejun Li (NPU: Northwestern Polytechnical University)H-Index: 68
view all 6 authors...
Numerical simulation with progressive damage criterion is implemented to investigate the effect of porosity on the bending properties of 2D cross-ply carbon/carbon (C/C) composites. The mechanical properties of Pyrocarbon matrix regarding the change of porosity are calculated by using Mori-Tanaka approach. Combining with the stiffness degradation scheme, the ultimate bending strengths are calculated in Abaqus though a user-defined subroutine (USDFLD). Delamination is modelled by inserting cohesi...
25 CitationsSource
#1F. Cancino-Trejo (CINVESTAV)H-Index: 1
#2M. Sáenz Padilla (CINVESTAV)H-Index: 1
Last. Joseph Somers (ITU: Institute for Transuranium Elements)H-Index: 22
view all 6 authors...
Abstract It is well accepted that TRISO (tristructural isotropic) coated nuclear fuel particles are capable of retaining fission products up to 1600 °C, however above this temperature fission products can diffuse through the pyrolytic carbon (PyC) and silicon carbide coatings that act as the containment barriers in this fuel. Despite decades of research and development, little is known on the origin of this fuel temperature limit. In order to understand the origin of this fuel temperature PyC co...
4 CitationsSource
#1Lihong Xia (CSU: Central South University)H-Index: 1
#2Boyun Huang (CSU: Central South University)H-Index: 1
Last. Tengfei Chen (CSU: Central South University)H-Index: 1
view all 5 authors...
Abstract Carbon fiber preforms were pre-heat treated at 2100 °C and then filled with smooth laminar (SL) pyrocarbon matrix by isothermal chemical vapor infiltration. The microstructure and flexural properties of carbon/carbon (C/C) composites after heat treatment from 1800 to 2500 °C were investigated. The microstructure investigation indicated that heat treatment did not affect the extinction angle, but resulted in distinct interfacial cracks and concentric cracks in the SL pyrocarbon. Three-po...
12 CitationsSource
#1Wei Yang (Beihang University)H-Index: 10
#2Ruiying Luo (Beihang University)H-Index: 19
Last. Ming-yang Hao (Beihang University)H-Index: 5
view all 6 authors...
Abstract Three carbon/carbon composites with rough laminar, smooth laminar and dual matrix carbon were prepared by chemical vapor infiltration (CVI) using hydrogen-diluted methane, CVI using nitrogen-diluted propane, and two-step CVI using first methane/hydrogen and carbon dioxide and then furan resin impregnation and carbonization. The influence of the microstructure of the carbon matrix on the internal friction behavior of the composites was investigated. Results indicate that the microstructu...
15 CitationsSource
#1Junjie Ren (NPU: Northwestern Polytechnical University)H-Index: 9
#2Kezhi Li (NPU: Northwestern Polytechnical University)H-Index: 56
Last. Hejun Li (NPU: Northwestern Polytechnical University)H-Index: 68
view all 5 authors...
Abstract A three-dimensional (3D) carbon/carbon (C/C) composite was prepared using the gaseous mixture of ethanol and methane as the precursor by isothermal chemical vapor infiltration. The preform was infiltrated at 1100 °C with the gas pressure from 2 to 10 kPa. The texture of the infiltrated carbon was studied by polarized-light microscopy and characterized with the aid of the extinction angle. Texture and fracture morphology of the pyrolytic carbon matrix were observed using a scanning elect...
6 CitationsSource
#1Qiang Song (NPU: Northwestern Polytechnical University)H-Index: 26
#2Kezhi Li (NPU: Northwestern Polytechnical University)H-Index: 56
Last. Qiangang Fu (NPU: Northwestern Polytechnical University)H-Index: 56
view all 6 authors...
Abstract We reported a novel method to fabricate isotropic pyrocarbon (ISO Pc). A multi-walled carbon nanotube (MWCNT) preform (30 vol.% content, in which curved MWCNTs were randomly dispersed) was first prepared and was then densified to fabricate bulk ISO Pc by fixed-bed chemical vapor deposition (CVD) at low temperatures. Microstructure analyses show that the product is isotropic on both the micro- and nano-scale. It was found that the method can prepare ISO Pc under broad CVD conditions, whi...
26 CitationsSource
#1Wei Li (NPU: Northwestern Polytechnical University)H-Index: 2
#2Li Hejun (NPU: Northwestern Polytechnical University)H-Index: 25
Last. Jian-feng Wei (NPU: Northwestern Polytechnical University)H-Index: 1
view all 6 authors...
Short carbon fiber felts with an initial porosity of 89.5% were deposited by isobaric, isothermal chemical vapor infiltration using natural gas as carbon source. The bulk density of the deposited carbon/carbon (C/C) composites was 1.89 g/cm3 after depositing for 150 h. The microstructure and mechanical properties of the C/C composites were studied by polarized light microscopy, X-ray diffraction, scanning electron microscopy and three-point bending test. The results reveal that high textured pyr...
18 CitationsSource
Cited By6
Newest
#1Jinxue DingH-Index: 1
#2Xiaokang MaH-Index: 8
Last. Laifei ChengH-Index: 72
view all 6 authors...
Abstract In this work, the microstructure, failure behavior and interfacial properties with respective to the interfacial domain in SiCf/BN/SiC and Cf/PyC/SiC composites were studied via the fiber push-in test. The differences in the mechanical response of the interfacial domain were observed. During the fiber push-in test for SiCf/BN/SiC, the interface debonding accompanied with interphase fracture occurred, resulting in an obvious sign of the onset of debonding on loading-displacement (P-u) cu...
3 CitationsSource
Source
#1Tiyuan Wang (NPU: Northwestern Polytechnical University)H-Index: 5
#2Hejun Li (NPU: Northwestern Polytechnical University)H-Index: 68
Last. Shouyang Zhang (NPU: Northwestern Polytechnical University)H-Index: 19
view all 7 authors...
The microstructure of pyrolytic carbon significantly affects the performance of aircraft brake discs. In this study, to explore the effect of precursor on the microstructure of pyrocarbon, two types of pyrocarbon films were grown on the quartz glass substrates by isothermal isobaric chemical vapor infiltration using methane and acetaldehyde as precursors. The microstructures of both the films and their formation mechanisms were investigated and compared. The thicknesses of the pyrocarbon films f...
Source
#1Ge Jian (NPU: Northwestern Polytechnical University)
#2Lehua Qi (NPU: Northwestern Polytechnical University)H-Index: 26
Last. Hejun Li (NPU: Northwestern Polytechnical University)H-Index: 68
view all 6 authors...
Abstract A modified random fiber removal algorithm is proposed to numerically study transverse elastic properties of unidirectional carbon fiber reinforced pyrolytic carbon (C/C) composites.This method can efficiently generate the Representative Volume Element (RVE) of composites with random distribution fibers. On the basis of the numerical homogenization strategy, the effect of interphase between carbon fiber and pyrolytic carbon on the mechanical behaviors of unidirectional C/C composites are...
Source
#1Jing Xu (NPU: Northwestern Polytechnical University)
#2Lingjun Guo (NPU: Northwestern Polytechnical University)H-Index: 18
Last. W. H. Li (NPU: Northwestern Polytechnical University)H-Index: 1
view all 6 authors...
Abstract null null The application of C/C-SiC composites remains a challenge because of the poor mechanical properties induced by the liquid silicon infiltration method. In this study, a thick high textured pyrolytic carbon (HT PyC) interface manufactured by chemical vapor infiltration (CVI) was used to protect the carbon fibers and improve the flexural properties. The microstructure of HT PyC, its flexural properties, and its associated strengthening and toughening mechanisms were analyzed on t...
Source
#1Tiyuan Wang (NPU: Northwestern Polytechnical University)H-Index: 5
#2Shouyang Zhang (NPU: Northwestern Polytechnical University)H-Index: 19
Last. Hejun Li (NPU: Northwestern Polytechnical University)H-Index: 68
view all 6 authors...
Abstract The present study explored the effect of medium texture (MT) content on flexural properties and thermal expansion coefficients (CTES) of carbon/carbon (C/C) composites with multilayered pyrolytic carbon. The specimen with 39% MT exhibited maximum flexural strength of 221.55 MPa, increasing by 52% compared with pure high texture. While the flexural strength decreased when the MT content exceeded 39%. The excellent strength can be attributed to crack deflection between multilayered textur...
2 CitationsSource
#1Tiyuan Wang (NPU: Northwestern Polytechnical University)H-Index: 5
#2Hejun Li (NPU: Northwestern Polytechnical University)H-Index: 68
Last. Shouyang Zhang (NPU: Northwestern Polytechnical University)H-Index: 19
view all 7 authors...
Abstract In order to explore the dependence of mechanical properties on the microstructure of high-textured (HT) pyrolytic carbon (PyC), the microstructure and properties of HT PyC specimens prepared by isothermal isobaric chemical vapor infiltration (ICVI) and thermal gradient chemical vapor infiltration (TCVI) processes were investigated. The HT PyC of ICVI was uniform and exhibited a more distinct long-range order compared to that of TCVI. Besides, a spatial gradient in texture existed within...
12 CitationsSource