<trans-title xml:lang="en">Single-phase Formation Process and Carbon Vacancy Regulation of (TiVNbMoW)C<i><sub>x</sub></i> High-entropy Ceramics </trans-title>

Ning CUI; Yuxin ZHANG; Lujie WANG; Tongyang LI; Yuan YU; Huaguo TANG; Zhuhui QIAO

doi:10.15541/jim20240477

Journal of Inorganic Materials, Volume. 40, Issue 5, 511(2025)

Single-phase Formation Process and Carbon Vacancy Regulation of (TiVNbMoW)C_x High-entropy Ceramics

Ning CUI¹, Yuxin ZHANG^1,3, Lujie WANG^2,3,4、*, Tongyang LI^2,3,4, Yuan YU², Huaguo TANG^2,3, and Zhuhui QIAO^2,3,4、*

Author Affiliations

¹1. School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266525, China

²2. Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China

³3. Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai, Yantai 264006, China

⁴4. Yantai Zhongke Research Institute of Advanced Materials and Green Chemical Engineering, Yantai 264006, China

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Figures & Tables(12)

1. SE-SEM image and EDS analyses of mixed powders with C/TM of 0.9

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2. XRD patterns (a) and enlarged patterns (b) of mixed powders and samples sintered at different temperatures

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3. Relative densities of samples sintered at different temperatures

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4. SE-SEM images and EDS analyses of samples with C/TM of 0.9 sintered at different temperatures

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5. BE-SEM images and EDS analyses of different C/TM samples sintered at 1800 ℃

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6. XRD patterns (a) and enlarged patterns (b) of different C/TM samples sintered at 1800 ℃

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7. Relative densities of different C/TM samples sintered at 1800 ℃

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8. EBSD mappings and corresponding grain size distributions of different C/TM samples sintered at 1800 ℃

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9. SE-SEM images of crack propagation of different C/TM samples sintered at 1800 ℃

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Table 1. Basic parameters of raw material powders

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Table 1. Basic parameters of raw material powders

Raw powder	Average particle size/µm	Purity/%	Crystal structure	Lattice constant/Å
TiC	1	99.9	fcc	4.33
VC	1	99.9	fcc	4.18
NbC	1	99.9	fcc	4.47
Mo₂C	1	99.9	hcp	a=3.01, c=4.74
WC	1	99.9	hcp	a=2.91, c=2.83
W	1	99.9	bcc	a=3.165
Graphite	0.05	99.9

Table 2. Raw material composition of samples with different C/TM
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Table 2. Raw material composition of samples with different C/TM
C/TM Mass fraction/%
TiC VC NbC Mo₂C WC W Graphite
1.0 11.26 11.84 19.74 19.18 36.85 0 1.13
0.9 11.39 11.98 19.96 19.40 37.27 0 0
0.8 11.53 12.12 20.19 19.62 18.85 17.69 0
0.7 11.66 12.26 20.43 19.85 0 35.80 0

Table 3. Hardness, elastic modulus and fracture toughness of different C/TM samples sintered at 1800 ℃

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Table 3. Hardness, elastic modulus and fracture toughness of different C/TM samples sintered at 1800 ℃

Sample	Hardness/GPa	Elastic modulus/GPa	Fracture toughness/(MPa·m^1/2)
1800-1.0	20.60±1.42	421.34±7.88	3.32±0.09
1800-0.9	26.98±1.51	452.86±9.33	2.87±0.10
1800-0.8	30.64±0.93	502.37±8.85	3.94±0.09
1800-0.7	28.01±1.10	490.53±5.79	3.00±0.10

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Ning CUI, Yuxin ZHANG, Lujie WANG, Tongyang LI, Yuan YU, Huaguo TANG, Zhuhui QIAO. Single-phase Formation Process and Carbon Vacancy Regulation of (TiVNbMoW)C_x High-entropy Ceramics [J]. Journal of Inorganic Materials, 2025, 40(5): 511

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