Effects of TiC content on microstructure, mechanical properties, and thermal conductivity of W-TiC alloys fabricated by a wet-chemical method

Lang, Shaoting; Yan, Qingzhi; Sun, Ningbo; Zhang, Xiaoxin; Chen, Ge

doi:10.1016/j.fusengdes.2017.07.026

Cited by 26 publications

(6 citation statements)

References 19 publications

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“…The rolled samples were annealed at 1373 K in the hydrogen atmosphere for 2 h to relax residual stress. The detail was previously reported by our group [7,28,29]. Then samples were cut into a size of 12 mm × 12 mm × 3 mm and polished to a surface roughness of Ra < 100 nm.…”

Section: Methodsmentioning

confidence: 99%

“…For the brittleness issue, the dispersion strengthening process is proved as an effective way to increase the strength of tungsten [6]. Traditional dispersion strengthened particles are usually carbide [7,8] and rareearth oxides [9,10] (like Y 2 O 3 , La 2 O 3 , TiC and ZrC). For the surface damage issue, the concern, such as the tungsten atom sputtering, localized melting and fibreform nanostructure by neutron and light ion irradiations [11][12][13][14][15][16][17][18][19][20] are difficult to solve.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of a diamond coating by the CVD method on the tungsten substrate and its resistance to D plasma irradiation

Wang

Yan

2019

Tungsten

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After the surface of tungsten (W) alloys were roughened by laser, chemical vapor deposition (CVD) of diamond coatings were deposited on three tungsten substrates of pure W, W-1 wt.% La 2 O 3 and W-0.5 wt.% TiC. Under the same growth parameters, the presence of the second phase in the tungsten matrix impeded the growth rate of diamonds, so a completed diamond coating with the thickness of 45 μm and a grain diamond size of 10 μm was obtained only on pure tungsten substrate after running for 10 h. Scanning electron microscopy, X-ray diffraction and Raman spectroscopy tests proved that the obtained diamond coating was compact with a high purity and regular morphology. To verify the chemical and structural stability, the as-obtained diamond-coated tungsten materials were exposed to an ion flux of 1.4 × 10 21 ions m −2 s −1 in D plasma for 30 min. After irradiation, neither delamination, dramatic coating failure nor entire erosion of the coating (graphitization) was observed. The diamond coating can be an effective protective layer to stop tungsten atoms from splashing into the plasma.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation of a diamond coating by the CVD method on the tungsten substrate and its resistance to D plasma irradiation

Wang

Yan

2019

Tungsten

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“…Grain growth inhibitors can be added to W to pin the grain boundary motion and slow down grain growth. They are typically second-phase particles that are thermally stable in W matrix, such as Al 2 O 3 , [144,145,162] ZrO 2 , [48,163] HfO 2 , [117,164] rare earth oxide such as Y 2 O 3 , [47,71,75,133,135,142,143,147,149,156,158,[165][166][167] La 2 O 3 , [50,155,[168][169][170] CeO 2 , [146] and carbides such as TiC, [171][172][173][174][175][176] ZrC, [177][178][179][180][181] and HfC. [182,183] Figure 6c summarizes the grain size and density of several oxide dispersion strengthened (ODS) W from literature reports.…”

Section: Tungstenmentioning

confidence: 99%

Powder Metallurgy Route to Ultrafine‐Grained Refractory Metals

Zhang

et al. 2023

Advanced Materials

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Ultrafine‐grained (UFG) refractory metals are promising materials for applications in aerospace, microelectronics, nuclear energy, and many others under extreme environments. Powder metallurgy (PM) allows to produce such materials with well‐controlled chemistry and microstructure at multiple length scales and near‐net shape manufacturing. However, sintering refractory metals to full density while maintaining a fine microstructure is still challenging due to the high sintering temperature and the difficulty to separate the kinetics of densification versus grain growth. Here an overview of the sintering issues, microstructural design rules, and PM practices towards UFG and nanocrystalline refractory metals are sought to be provided. The previous efforts shall be reviewed to address the processing challenges, including the use of fine/nanopowders, second‐phase grain growth inhibitors, and field‐assisted sintering techniques. Recently, pressureless two‐step sintering has been successfully demonstrated in producing dense UFG refractory metals down to ≈300 nm average grain size with a uniform microstructure and this technological breakthrough shall be reviewed. PM progresses in specific materials systems shall be next reviewed, including elementary metals (W and Mo), refractory alloys (W‐Re), refractory high‐entropy alloys, and their composites. Last, future developments and the endeavor towards UFG and nanocrystalline refractory metals with exceptionally uniform microstructure and improved properties are outlined.

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“…Transition and rare metal carbide and oxide particles such as ZrC [ 10 , 11 ], TiC [ 12 , 13 , 14 , 15 , 16 , 17 ], HfC [ 18 ], La 2 O 3 [ 19 , 20 ], and Y 2 O 3 [ 21 ] have been introduced into the tungsten matrix to improve the mechanical properties of tungsten materials effectively. Among these introduced particles, transition metal carbide particles have been proven to be ideal strengthening phases for tungsten materials [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

“…To date, several methods have been developed to prepare carbide particle reinforced tungsten materials, such as using mechanical alloying [ 3 , 10 , 13 , 14 , 15 , 21 , 27 ] and chemical method [ 16 , 17 , 28 , 29 , 30 , 31 , 32 ] to prepare tungsten composite powders, and then utilizing different sintering methods to consolidate the composite powders. Among these powder preparing methods, mechanical alloying is the predominant preparation method to prepare carbide particle reinforced tungsten alloys.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Ultra-Fine-Grained W-TiC Alloys by a Simple Ball-Milling and Hydrogen Reduction Method

et al. 2021

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In this paper, a simple method to fulfill the ideal microstructural design of particle reinforced tungsten (W) alloys with promising mechanical properties is presented. W-0.5 wt.% TiC powders with core-shell (TiC/W) structure are prepared by ball-milling and controlled hydrogen reduction processes. TEM observation demonstrates that the nano TiC particles are well coated by tungsten. The W-TiC powders are sintered by spark plasma sintering (SPS) under 1600 °C. The sintered microstructures are characterized by FESEM and TEM. It is found that the W-0.5TiC alloys obtain an ultra-fine-sized tungsten grain of approximately 0.7 μm. The TiC particles with the original nano sizes are uniformly distributed both in tungsten grain interiors and at tungsten grain boundaries with a high number density. No large agglomerates of TiC particles are detected in the microstructure. The average diameter of the TiC particles in the tungsten matrix is approximately 47.1 nm. The mechanical tests of W-0.5 TiC alloy show a significantly high microhardness and bending fracture strength of 785 Hv0.2 and 1132.7 MPa, respectively, which are higher than the values obtained in previous works. These results indicate that the methods used in our work are very promising to fabricate particle-dispersion-strengthened tungsten-based alloys with high performances.

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Effects of TiC content on microstructure, mechanical properties, and thermal conductivity of W-TiC alloys fabricated by a wet-chemical method

Cited by 26 publications

References 19 publications

Preparation of a diamond coating by the CVD method on the tungsten substrate and its resistance to D plasma irradiation

Preparation of a diamond coating by the CVD method on the tungsten substrate and its resistance to D plasma irradiation

Powder Metallurgy Route to Ultrafine‐Grained Refractory Metals

Fabrication of Ultra-Fine-Grained W-TiC Alloys by a Simple Ball-Milling and Hydrogen Reduction Method

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