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Chuan Qiang Yin

Bio: Chuan Qiang Yin is an academic researcher from Nanchang University. The author has contributed to research in topics: Materials science & Polyimide. The author has an hindex of 2, co-authored 3 publications receiving 14 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, the thermodynamic process, the composition, the microstructure as well as the properties of the FeTiO3-Al-C system were studied in detail through theoretical analysis and experimental research.
Abstract: Fe-Al intermetallic/TiC-Al2O3 ceramic composites were fabricated by in-situ carbothermic and aluminothermic reduction from natural ilmenite. Synthesis and sintering of the composites were accomplished unanimously in the vacuum hot pressure furnace. The thermodynamic process, the composition, the microstructure as well as the properties of the FeTiO3-Al-C system were studied in detail through theoretical analysis and experimental research. It was shown that the synthesis process started from the melting aluminium, followed by the deoxidation of ilmenite step by step via a series of different valent titanium oxides to form TiC, Al2O3 and Fe-Al as the ultimate productions. The particle sizes are mostly 3-5μm, and their distributions are uniform. Meanwhile, the addition of additives can improve the wettability of alloy to ceramic phases and the combination of the interfaces, giving rise to the properties of the composites as a whole.

8 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of C content on the mechanical properties and microstructures of GT35 composites were investigated, and the results showed that the good mechanical properties of steel-bonded cemented carbide GT35 composite were obtained with 0.9wt.% C at the same sintering conditions and the density reached 6.12g/cm3, the average bending strength was over 1229MPa after heat treatment, the mean hardness HRC was 69.4.
Abstract: Steel-bonded cemented carbide GT35 was fabricated from natural ilmenite by in-situ carbothermic reduction and vacuum pressureless sintering. The effects of C content on the mechanical properties and microstructures of GT35 composites were investigated. As an excellent reducer, carbon provides an impetus for a series of reductive process. C content determines the melting point of the steel matrix, and directly affects the mechanism of dissolving and segregating of TiC particles, forming a netlike microstructure. Besides, the liquid steel whose viscosplasticity is determined by C content was coated on the surface of the composite and refrained the release of CO. The results showed that the good mechanical properties of steel-bonded cemented carbide GT35 composite were obtained with 0.9wt.% C at the same sintering conditions and the density reached 6.12g/cm3, the average bending strength was over 1229MPa after heat treatment, the mean hardness HRC was 69.4. It also showed that in-situ reduction of natural limonite was a feasible way to fabricate good performance GT35 composite with a relatively low cost.

6 citations

Journal ArticleDOI
TL;DR: In this article , a flexible carbon nanofiber membrane with a three-dimensional network structure was fabricated based on PMDA/ODA polyimide by combining electrospinning, imidization, and carbonization strategies.
Abstract: Free-standing and flexible carbon nanofiber membranes (CNMs) with a three-dimensional network structure were fabricated based on PMDA/ODA polyimide by combining electrospinning, imidization, and carbonization strategies. The influence of carbonization temperature on the physical-chemical characteristics of CNMs was investigated in detail. The electrochemical performances of CNMs as free-standing electrodes without any binder or conducting materials for lithium-ion batteries were also discussed. Furthermore, the surface state and internal carbon structure had an important effect on the nitrogen state, electrical conductivity, and wettability of CNMs, and then further affected the electrochemical performances. The CNMs/Li metal half-cells exhibited a satisfying charge–discharge cycle performance and excellent rate performance. They showed that the reversible specific capacity of CNMs carbonized at 700 °C could reach as high as 430 mA h g−1 at 50 mA g−1, and the value of the specific capacity remained at 206 mA h g−1 after 500 cycles at a high current density of 1 A g−1. Overall, the newly developed carbon nanofiber membranes will be a promising candidate for flexible electrodes used in high-power lithium-ion batteries, supercapacitors and sodium-ion batteries.

6 citations

Journal ArticleDOI
28 Aug 2022-Polymers
TL;DR: In this article , a triple crosslinking strategy, including pre-rolling, solvent and chemical imidization cross-linking, was proposed to solve the problem of low electrical conductivity of carbon nanofiber membranes.
Abstract: In order to solve the problem of low electrical conductivity of carbon nanofiber membranes, a novel triple crosslinking strategy, including pre-rolling, solvent and chemical imidization crosslinking, was proposed to prepare carbon nanofiber membranes with a chemical crosslinking structure (CNMs-CC) derived from electrospinning polyimide nanofiber membranes. The physical-chemical characteristics of CNMs-CC as freestanding anodes for lithium-ion batteries were investigated in detail, along with carbon nanofiber membranes without a crosslinking structure (CNMs) and carbon nanofiber membranes with a physical crosslinking structure (CNMs-PC) as references. Further investigation demonstrates that CNMs-CC exhibits excellent rate performance and long cycle stability, compared with CNMs and CNMs-PC. At 50 mA g−1, CNMs-CC delivers a reversible specific capacity of 495 mAh g−1. In particular, the specific capacity of CNMs-CC is still as high as 290.87 mAh g−1 and maintains 201.38 mAh g−1 after 1000 cycles at a high current density of 1 A g−1. The excellent electrochemical performance of the CNMs-CC is attributed to the unique crosslinking structure derived from the novel triple crosslinking strategy, which imparts fast electron transfer and ion diffusion kinetics, as well as a stable structure that withstands repeated impacts of ions during charging and discharging process. Therefore, CNMs-CC shows great potential to be the freestanding electrodes applied in the field of flexible lithium-ion batteries and supercapacitors owing to the optimized structure strategy and improved properties.

2 citations

Journal ArticleDOI
TL;DR: In this paper , the boron nitride nanosheet (BNNS-t) was prepared by the template method using sodium chloride as the template, and B2O3 and flowing ammonia as the borsheets and nitrogen sources, respectively.
Abstract: Polyimide/boron nitride nanosheet (PI/BNNS) composite films have potential applications in the field of electrical devices due to the superior thermal conductivity and outstanding insulating properties of the boron nitride nanosheet. In this study, the boron nitride nanosheet (BNNS-t) was prepared by the template method using sodium chloride as the template, and B2O3 and flowing ammonia as the boron and nitrogen sources, respectively. Then, the PI/BNNS-t composite films were investigated with different loading of BNNS-t as thermally conductive fillers. The results show that BNNS-t has a high aspect ratio and a uniform lateral dimension, with a large dimension and a thin thickness, and there are a few nanosheets with angular shapes in the as-obtained BNNS-t. The synergistic effect of the above characteristics for BNNS-t is beneficial to constructing the three-dimensional heat conduction network of the PI/BNNS-t composite films, which can significantly improve the out-of-plane thermal conduction properties. And then, the out-of-plane thermal conductivity of the PI/BNNS-t composite film achieves 0.67 W m–1 K–1 at 40% loading, which is nearly 3.5 times that of the PI film.

1 citations


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TL;DR: In this paper, the microstructure, porosity and fracture morphology of the samples were analyzed with scanning electron microscopy (SEM) using X-ray diffraction (XRD).

34 citations

Journal ArticleDOI
TL;DR: In this article, the critical temperatures of the mixture of ilmenite, aluminum and graphite powder mixture were determined by DTA analysis and the final products were analyzed with XRD.
Abstract: Al 2 O 3 /TiC composites are used as cutting tools for machining gray cast iron and steels. The addition of iron improves the toughness of Al 2 O 3 /TiC composites. Ilmenite, aluminum and graphite can be used to produce in-situ Al 2 O 3 /TiC–Fe composites. However the formation mechanism and reaction sequences of the system are not clear enough. Therefore, the present research is designed to determine the formation mechanism and the reaction sequences of the foresaid system. In this research, ilmenite was synthesized to prevent the presence of impurities in the system and then the critical temperatures of ilmenite, aluminum and graphite powder mixture were determined by DTA analysis. The milled and pressed samples, prepared from this mixture, were heat treated at the critical temperatures. The final products were analyzed with XRD. It was found that at the first exothermic peak of DTA curve (720 °C), aluminum reacts with FeTiO 3 , forming Fe, TiO 2 , Al 2 O 3 and Fe 2 Al 5 . Further increase in the temperature, up to 930 °C, results not only in the transformation of TiO 2 to Ti 2 O 3 and TiO, but also in the conversion of Fe 2 Al 5 to FeAl. Moreover, titanium carbide will also be formed. With the rise in temperature, Ti 2 O 3 , TiO and iron aluminides disappear and TiC, Al 2 O 3 and Fe will be the final compounds.

28 citations

Journal ArticleDOI
TL;DR: In this paper, the microstructure, properties, and dimensional stability of a TiC-reinforced steel matrix composite during tempering and identifying the underlying stabilizing mechanisms were investigated.

11 citations

Zou, Zhengguang, Wu, Yi, Yin, Chuanqiang, Li, Xiaomin 
01 Jan 2007
TL;DR: In this paper, the effects of carbon sources, preheating time and heat treatment temperature on synthesis process and products were investigated in detail, and the reaction process of the FeTiO3-Al-C system was also discussed.
Abstract: Fe-Al intermetallic/TiC-Al2O3 ceramic composites were successfully prepared by self-propagating high-temperature synthesis (SHS) from natural ilmenite, aluminium and carbon as the raw materials. The effects of carbon sources, preheating time and heat treatment temperature on synthesis process and products were investigated in detail, and the reaction process of the FeTiO3-Al-C system was also discussed. It is shown that the temperature and velocity of the combustion wave are higher when graphite is used as the carbon source, which can reflect the effect of the carbon source structure on the combustion synthesis; Prolonging the preheating time or heat treatment temperature is beneficial to the formation of the ordered intermetallics; The temperature and velocity of the combustion wave are improved, but the disordered alloys are difficult to eliminate with the preheating time prolonged. The compound powders mainly containing ordered Fe3Al intermetallic can be prepared through heat treatment at 750 °C.

11 citations

Journal ArticleDOI
TL;DR: In this paper, Magnesothermic reduction of natural ilmenite is a feasible way to fabricate ultrafine powder with a relatively lower cost and it is shown that combustion synthesis of the FeTiO3-Mg system can carry out due to its strong exothermic reaction through adiabatic temperature calculate.

9 citations