CERAMICS INTERNATIONAL
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2020
·Vol. 47
·期 5
·5918-5928
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IF 3.83
Yu Zhao,Tianqi Zhang,Liaoyuan Chen,Tianbiao Yu,Jiayu Sun,Chuang Guan
In situ Ti(C, N), ring phase, and multi-phase enhanced Ni204-based alloy coating were prepared by adding various Ti/C/TiN ratios particles. The effects of the reinforcement phase on the microstructure, microhardness , tribological property, and microstructure characteristics at the interface between the coating and substrate were investigated. The results show that the coatings with a 5:1 mass fraction ratio of TiN/C exhibits the highest microhardness , which is 3.78 times higher than that of the original Ni204 coating. While, the coating with 21:7:2 mass fraction ratio of TiN/Ti/C exhibits the lowest friction coefficient , which is 4.44 times smaller than that of the original Ni204 coating. The addition of Ti and C particles promotes the precipitation of ring phase and carbides , reduces ceramic agglomeration, alleviates the floating of ceramic particles, and improves the bonding strength of reinforcement phases. Owing to the good mutual solubility among Fe, Ni, and, Cr elements, the diffusion happened at the interface between the coating and substrate.
研究领域:
材料科学
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表面工程
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金属学与金属工艺
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机械工程
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复合材料
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DOI
高影响因子
Advanced Sustainable Systems
·
2022
·Vol. 6
·期 10
·2200196
·
IF 6.737
Haojie Shao,Yutong Wu,Xin Xu,Yuxi Xian,Yangyang Shi,Feihong Wang,Kai Lv,Chuntian Tan,Luyuan Hao,Binbin Dong,Simeon Agathopoulos
The industrial application of powder-based catalytic electrodes is heavily restricted by powder shedding, inhibition of active sites, and poor long-term stability. Herein, a porous titanium carbonitride (TiC 0.5 N 0.5 ) ceramic substrate with open straight finger-like holes is first made by a simple approach of phase-inversion tape-casting and pressureless sintering, and then a Co x Ni 1- x P active layer is in situ formed by a hydrothermal technique and phosphorization to achieve integrated Co x Ni 1- x P/TiC 0.5 N 0.5 self-supported ceramic electrodes. Electrochemical tests reveal that the optimized Co 0.9 Ni 0.1 P/TiC 0.5 N 0.5 electrode exhibits overpotentials of 76.5 and 79.8 mV at 10 mA cm −2 , Tafel slopes of 47.3 and 40.5 mV dec −1 , in 0.5 m H 2 SO 4 and 1 m KOH, respectively. Furthermore, its superior long-term stability and resistance to corrosion can be achieved for more than 20 h in both media at 100 mA cm −2 . In addition, the Co 0.9 Ni 0.1 P/TiC 0.5 N 0.5 electrode has much better performance than Pt/C at high current density in neutral media. Density functional theory calculations confirm that the Ni substitution of 1/10 Co in CoP leads to the more optimal |Δ G H* | among the Co x Ni 1- x P catalysts. Compared with other CoP or NiP-based electrodes, the Co 0.9 Ni 0.1 P/TiC 0.5 N 0.5 electrode benefits from high strength, unique pore structure, tight and compatible bonding, and high hydrophilicity.
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DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2021
·
IF 3.871
Zhaoran Chen,Dejiang Ma,Shanmin Wang,Pinwen Zhu,Qiang Tao,Baochang Liu
Ti-coated diamond and cBN with TiCN as the binder were used to fabricate the TDBN-TiCN series PDC with improved heat resistance, wear resistance and impact toughness by a China-type cubic high-pressure apparatus (5.5–6.5 GPa, 1450–1650 °C) for drilling. Under high temperature and high pressure conditions, the Co in the cemented carbide substrate penetrated into the PCD layer and the binder TiCN to form a metal-ceramic binder system. It can promote the formation of polycrystalline cubic boron nitride (PcBN) from cubic boron nitride particles at the grain boundaries, and promote the TDBN-TiCN series PDC to have the performance of PCD and PcBN. Compared with the TDBN series PDC developed by our former research, the wear resistance of TDBN-TiCN series PDC increased by 17% and the impact toughness increased by 26%. In the TDBN-TiCN series PDC, some heat resistant phases, such as PcBN, TiB 2 and TiN, were formed so as to enhance the initial graphitization and oxidizing temperatures to 958 °C, which was 8 °C higher than the TDBN series PDC (950 °C) and 178 °C higher than conventional PDC (780 °C).
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Qianglong He,Shi Tian,Jingjing Xie,Cuili Xiang,Hao Wang,Weimin Wang,Zhengyi Fu
B 6.5 C-TiB 2 -SiC-BN composite ceramics were prepared by a novel solid-state reaction using TiCN, B, and Si as raw materials. The final products obtained by hot pressing at 1950 °C possessed a fine microstructure, homogeneous distribution, and excellent mechanical properties . The obtained bulk B 6.5 C-TiB 2 -SiC-BN composite ceramic shows a high relative density (98.8 %). The mechanical properties of the composites are anisotropic because of the orientation growth and structural characteristics of TiB 2 and h-BN grains. The values of hardness, bending strength , and fracture toughness measured along the hot-pressing direction were 19.6 GPa, 801 MPa, and 4.30 MPa m 1/2 , respectively, which were higher than those measured perpendicular to the hot-pressing direction. The formation of twin structures in B 6.5 C and SiC grains and the crack deflections induced by h-BN and TiB 2 grains are beneficial for improving the mechanical properties of these composites.
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DOI
高影响因子
CERAMICS INTERNATIONAL
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2020
·
IF 3.83
Junxiao Tang,Wei Ji,Jingjing Xie,Yunwei Shi,Yuexu Zhu,Qianglong He,Weimin Wang
In this study, B 6.5 C-TiB 2 -SiC-BN composite was fabricated via reactive hot pressing from a powder mixture of TiCN, B, and Si. The reaction process of the powder mixture was investigated by heat treatment at elevated temperatures. The as-reacted powder products possessed a core-shell structure of TiB 2 surrounded by h-BN. During densification, the h-BN in this structure acts as a diffusion channel and lubricant, which promoted the densification process. The extremely small size, fresh surface of in-situ formed phases, and uniform dispersion in synthesized powders also contributed to sintering. The designed reactive hot-pressing sintering effectively resolves the difficulty of obtaining uniformly-dispersed BN. The obtained bulk B 6.5 C-TiB 2 -SiC-BN composite ceramic shows high relative density (98.8%) and good comprehensive mechanical properties including hardness, bending strength , and fracture toughness of 19.6 GPa, 801 MPa, and 5.31 MPa m 1/2 , respectively.
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Bo Xu,Fengyi Wang,Minxian Shi,Zhixiong Huang
Alumina fiber reinforced composites (AFC) have attracted massive attention in thermal protection materials due to their excellent high temperature mechanical properties. However, the application of the AFCs is restricted by their easy failure at high temperature condition for the sake of phase transition and grain growth. In this work, a series of alumina fiber based ceramizable composites modified with TiCN and B 4 C were prepared. The thermal stability, phase evolution, thermal insulation performance and anti-ablation mechanism of the composites were investigated. The flexural strength and residual weight yield of obtained ceramizable composite after static ablation at 1200 ℃ was 22.3 MPa and 85.8 %, showing obvious enhancement compared with those of the composite without ceramic fillers. The good ablation resistance and high temperature bearing capacity of the composites can be attributed to the formation of protective layer of rutile phase TiO 2 and the grain-refining effect of ceramic phase.
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DOI
高影响因子
危险品化学品经营许可证（带存储）