Gelcasting of titanium hydride to fabricate low-cost titanium

Ye, Qing; Guo, Zhimeng; Bai, Jianling; Lu, Boxin; Lin, Junpin; Chen, Cunguang; Luo, Ji; Shao, Huiping

doi:10.1007/s12598-015-0478-5

Cited by 9 publications

(5 citation statements)

References 15 publications

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“…However, these TS-1 samples usually have large crystal sizes (>1 μm) and low fractions of framework titanium, which limit their catalytic activity because of poor diffusion properties and an insufficient number of active sites ( Madsen et al, 1999 ; Zhang et al, 2017 ). Therefore, developing an effective strategy to synthesize TS-1 zeolite with high catalytic activity via a low-cost process is of great importance to enable its further application ( Wang et al, 2012 ; Ye et al, 2015 ).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Low Cost Titanium Silicalite-1 Zeolite for Highly Efficient Propylene Epoxidation

et al. 2021

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Developing an effective and low-cost system to synthesize titanium silicalite-1 (TS-1) zeolite is desirable for a range of industrial applications. To date, the poor catalytic activity of the synthesized zeolite due to the low amount of framework titanium and large crystal size is the main obstacle limiting the widespread application of this material. Moreover, a large amount of wastewater is often produced by the existing synthesis process. Herein, a green and sustainable route for synthesizing small-crystal TS-1 with a high fraction of framework Ti was demonstrated via a seed-assisted method using a tetrapropylammonium bromide (TPABr)-ethanolamine hydrothermal system. The influence of the synthesis conditions on the physicochemical properties and catalytic activities of TS-1 was investigated. With the assistance of nanosized S-1 seeds, the incorporation of Ti into the framework of TS-1 was promoted, and the crystallization rate was effectively accelerated. After alkaline etching, the obtained hierarchical TS-1 had higher catalytic activity towards propylene epoxidation with an extremely high turnover frequency of 1,650 h−1. Furthermore, the mother liquid during the hydrothermal reaction could be reused for the next synthesis procedure. Consequently, utilization ratios of both ethanolamine and TPABr exceeding 95% were achieved by recycling the mother liquid. This low-cost approach for reducing wastewater could be easily scaled up to provide a promising synthesis method for the industrial production of TS-1 and other topological zeolites.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Low Cost Titanium Silicalite-1 Zeolite for Highly Efficient Propylene Epoxidation

et al. 2021

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“…Consequently, discontinuously reinforced titanium matrix composites (DRTMCs) have been proposed, which have high specific strength, specific modulus, and exceptional high-temperature durability [ 3 , 4 , 5 ]. Among the many reinforcements, one of the best is the TiB whisker that is fully compatible with the titanium matrix [ 6 , 7 ]. However, a common issue of TiB w /Ti composites is the less satisfactory mechanical properties, which is due to the non-uniform distribution of the reinforcement TiB w and the coarse matrix microstructure [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Thermomechanical Processing of a Near-α Ti Matrix Composite Reinforced by TiBw

et al. 2020

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To further improve the mechanical properties of the as-cast 7.5 vol.% TiBw/Ti–6Al–2.5Sn–4Zr–0.7Mo–0.3Si composite, multi-directional forging (MDF) and subsequent heat treatments were carried out to adjust TiB whiskers (TiBw) and matrix characteristics. The effect of various microstructures on the tensile properties and fracture toughness of the composites was analyzed in this paper. After MDF, the TiBw are broken into short rods with a low aspect ratio and display a random distribution. Moreover, distinct microstructures were obtained after thermomechanical processing and different heat treatments. Both room-temperature and high-temperature tensile strength and ductility are improved after thermomechanical processing. By increasing the solution-treatment temperature, the microstructures transform from equiaxed to fully lamellar. A simultaneous improvement of the room-temperature and high-temperature properties is associated with the microstructural changes. In addition, the fracture toughness exhibits an increasing trend as the volume fraction of equiaxial α phases decreases. The lamellar microstructure demonstrates excellent fracture toughness due to deflection of the crack propagation path.

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“…Gelcasting process enables the production of parts with complex geometry, homogeneous microstructure and high green strength using a small quantity of organic binders (1) with potential advantages over some traditional powder metallurgy processes and metal injection molding (3). Most recently, gelcasting process was used to obtain metal foams or porous parts, as stated by Lin and Kennedy (4) and Kapat, Srivas and Dhara (5), and dense parts, as announced by Ye et al (6) and Ortega and Oliveira (7). A problem of this process is that metallic particles are generally denser and larger than ceramic particles, leading to fast sedimentation in liquid media.…”

Section: Introductionmentioning

confidence: 99%

“…Vacuum atmosphere at 10 -5 Torr was preferred because it provides a good densification (11) and the final temperature was based on a previous work (3). A thermogravimetric analysis (TG-DSC Setsys Evolution 1750, SETARAM) was done to verify the weight loss on a gelcast sample and on the powder (6). It was expected that debinding would occur during the sintering cycle, without a need of a specific step for it.…”

Section: Introductionmentioning

confidence: 99%

AISI 310 Stainless Steel Formed by Gelcasting: An Alternative Manufacturing Method

Oliveira

Neves

Ortega

2020

MSF

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This work evaluates the microstructure and the yield strength under compression at room temperature and at 800°C of specimens prepared with AISI 310 stainless steel powder (D50 = 10 μm), manufactured by gelcasting. Parts were vacuum sintered in a single batch at 1280°C. At room temperature, specimens presented average yield strength of 270 MPa, and at 800°C, 105 MPa. Microstructure analysis involved the measurement of grain size along the vertical axis of cylindrical specimens, with special attention to the effect of particles settling, and was conducted using scanning electron and optical microscopy, and X-ray diffraction. Settling effect was assessed considering the position where the specimen was taken and was negligible: both density and yield strength did not vary significantly along the vertical axis.

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Gelcasting of titanium hydride to fabricate low-cost titanium

Cited by 9 publications

References 15 publications

Synthesis of Low Cost Titanium Silicalite-1 Zeolite for Highly Efficient Propylene Epoxidation

Synthesis of Low Cost Titanium Silicalite-1 Zeolite for Highly Efficient Propylene Epoxidation

Thermomechanical Processing of a Near-α Ti Matrix Composite Reinforced by TiBw

AISI 310 Stainless Steel Formed by Gelcasting: An Alternative Manufacturing Method

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