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Research Article
Low temperature synthesis nanoscale Ta4HfC5 powder and characterization of Ta4HfC5 ceramics
W.B. Han
Harbin Institute of Technology
Corresponding Author
ORCiD: https://orcid.org/0000-0002-2931-6434
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This work is licensed under a CC BY 4.0 License. Read Full License
Solvothermal treatment was used to synthesize nanoscale 4TaC–HfC (Ta 4 HfC 5 ) powder at a relatively low calcination temperature (1400 °C) and in a short period through material selection and process optimization. High-volume Teflon-lined stainless steel autoclave (1000–2000 mL) could be used to prepare powder by using this method. The obtained powder had good size distribution and dispersity. Ta 4 HfC 5 powder could be obtained at a low temperature because of the existence of Ta 2 Hf 6 O 17 during carbothermal reduction.Ta 4 HfC 5 ceramics were consolidated via spark plasma sintering at 2100 °C and at 30, 40, and 50 MPa. Holding time was 5 min. Ceramics had a better densification and smaller grain sizes at a shorter sintering time compared with that of the mechanical ball milling method. The densification behavior of ceramics was analyzed, and the mechanical properties of different samples were investigated. Flexural strength increased from 5.85 ± 0.43 GPa to 10.07 ± 0.61 GPa. Fracture toughness was similar in all the compositions in the range of 2.36–2.56 MPa m 1/2 . This method can be applied to synthesize Ta 4 HfC 5 powder with high purity and uniformity in large quantities. Hence, ceramic sintering and Ta 4 HfC 5 –matrix composite preparation have a broad application prospect.
Keywords
polymer-derived ceramics, Ta4HfC5, spark plasma sintering, mechanical properties
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This is a preprint. It has not completed peer review.
Research Article
Low temperature synthesis nanoscale Ta4HfC5 powder and characterization of Ta4HfC5 ceramics
W.B. Han
Harbin Institute of Technology
Corresponding Author
ORCiD: https://orcid.org/0000-0002-2931-6434
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
History
CURRENT STATUS: Posted
Version 1
Posted 10 Apr, 2020
No community comments so far
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
Subject Areas
Thermodynamics and statistical mechanics
License:
This work is licensed under a CC BY 4.0 License. Read Full License
Solvothermal treatment was used to synthesize nanoscale 4TaC–HfC (Ta 4 HfC 5 ) powder at a relatively low calcination temperature (1400 °C) and in a short period through material selection and process optimization. High-volume Teflon-lined stainless steel autoclave (1000–2000 mL) could be used to prepare powder by using this method. The obtained powder had good size distribution and dispersity. Ta 4 HfC 5 powder could be obtained at a low temperature because of the existence of Ta 2 Hf 6 O 17 during carbothermal reduction.Ta 4 HfC 5 ceramics were consolidated via spark plasma sintering at 2100 °C and at 30, 40, and 50 MPa. Holding time was 5 min. Ceramics had a better densification and smaller grain sizes at a shorter sintering time compared with that of the mechanical ball milling method. The densification behavior of ceramics was analyzed, and the mechanical properties of different samples were investigated. Flexural strength increased from 5.85 ± 0.43 GPa to 10.07 ± 0.61 GPa. Fracture toughness was similar in all the compositions in the range of 2.36–2.56 MPa m 1/2 . This method can be applied to synthesize Ta 4 HfC 5 powder with high purity and uniformity in large quantities. Hence, ceramic sintering and Ta 4 HfC 5 –matrix composite preparation have a broad application prospect.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6