Research Progress on the Preparation and Characterization of Ultra Refractory TaxHf1-xC Solid Solution Ceramics

Peng XIAO; Yulin ZHU; Song WANG; Yiping YU; Hao LI

doi:10.15541/jim20200440

Journals >Journal of Inorganic Materials >Volume 36 >Issue 7 >Page 685 > Article

Journal of Inorganic Materials
Vol. 36, Issue 7, 685 (2021)

Research Progress on the Preparation and Characterization of Ultra Refractory Ta_xHf_1-_xC Solid Solution Ceramics

Peng XIAO¹, Yulin ZHU², Song WANG^1、*, Yiping YU¹, and Hao LI¹

Author Affiliations

¹1. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China

²2. Unit 32382 of the PLA, Wuhan 430311, China

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DOI: 10.15541/jim20200440 Cite this Article

Peng XIAO, Yulin ZHU, Song WANG, Yiping YU, Hao LI. Research Progress on the Preparation and Characterization of Ultra Refractory Ta_xHf_1-_xC Solid Solution Ceramics[J]. Journal of Inorganic Materials, 2021, 36(7): 685 Copy Citation Text

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$(a) XRD patterns of Ta0.8Hf0.2C solid solution ceramic before and after SPS at different temperatures and (b) more detailed diffraction patterns between 30° and 45°[32]$

1. (a) XRD patterns of Ta_0.8Hf_0.2C solid solution ceramic before and after SPS at different temperatures and (b) more detailed diffraction patterns between 30° and 45°^[32]

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2. Morphology of Ta_0.8Hf_0.2C solid solution ceramics synthesised by different SHS methods^[43]

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3. Morphologies of Ta_0.5Hf_0.5C powders synthesized via solvothermal method^[21]

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4. SEM images of Ta_0.8Hf_0.2C solid solution ceramic sintered at different temperatures^[52]

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5. HfO₂-Ta₂O₅-temperature phase space built by Kriven, et al^[58]

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6. Morphologies of Hf₆Ta₂O₁₇-Ta₂O₅eutectic structure^[6]

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7. Morphologies of Ta_0.25Hf_0.75C ceramic after oxidation^[6]

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	Solid solution between metal carbides	Carbonization reaction of metals	Carbothermal reduction of metal oxides
Advantages	Easy to operate; products have high purity and could achieve densification simultaneously	High temperature is not necessary; the whole process lasts only several seconds, not time consuming	Easy to operate; raw materials are cheap; have potential to synthesize single-phase products with fine grain size at relatively low temperature
Disadvantages	Needs high temperature and long time; products are not single-phase solid solution with elements uneven distribution	The reaction process are unable to control; products are usually not pure	The phase and microstructure of products are closely related to the distribution and binding state of oxides and carbon

Table 1. Advantages and disadvantages of different techniques for preparation of Ta_xHf_1-_xC powder

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	Raw powder	Sintering method	Relative density/%	Hardness/GPa	Elastic modulus/GPa	K_IC/(MPa·m^1/2)	Ref.
Ta_0.9Hf_0.1C-12vol% MoSi₂	TaC, HfC, MoSi₂	SPS	100.0	(15.0±0.2)	—	(3.2±0.3)	[26]
Ta_0.9Hf_0.1C-12vol% TaSi₂	TaC, HfC, TaSi₂	SPS	100.0	(15.9±0.3)	—	(3.3±0.2)	[26]
Ta_0.87Hf_0.13C	TaC, HfC	HIP	>98.0	24.1	575.4	—	[3]
Ta_0.8Hf_0.2C	Ta_0.8Hf_0.2C	HP	99.6	(30.3±1.6)	(462.5±3.1)	(2.2±0.4)	[30]
Ta_0.8Hf_0.2C	Ta_xHf_1-_xC	HP	94.4	27.2	491.7	3.0	[21]
Ta_0.8Hf_0.2C	TaC, HfC	SPS	97.8	(16.7±0.9)	(443.2±23.7)	(4.6±1.1)	[40]
Ta_0.8Hf_0.2C	TaC, HfC	SPS	(97.7±0.1)	(19.3±1.3)	(459.0±5.8)	(2.9±0.9)	[32]
Ta_0.8Hf_0.2C-10vol% MoSi₂	TaC, HfC, MoSi₂	SPS	99.8	(18.5±0.5)	(482.0±2.0)	(4.2±0.2)	[29]
Ta_0.8Hf_0.2C-12vol% MoSi₂	TaC, HfC, MoSi₂	SPS	100.0	(15.2±0.5)	—	(3.9±0.2)	[26]
Ta_0.8Hf_0.2C-12vol% TaSi₂	TaC, HfC, TaSi₂	SPS	100.0	(17.7±0.4)	—	(3.2±0.1)	[26]
Ta_0.75Hf_0.25C	TaC, HfC	HIP	>98.0	28.6	567.7	—	[3]
Ta_0.7Hf_0.3C-12vol% MoSi₂	TaC, HfC, MoSi₂	SPS	97.8	(15.9±0.6)	—	(3.9±0.1)	[26]
Ta_0.7Hf_0.3C-12vol% TaSi₂	TaC, HfC, TaSi₂	SPS	98.9	(18.2±0.7)	—	(2.8±0.1)	[26]
Ta_0.67Hf_0.33C	Ta_0.67Hf_0.33C	HP	95.3	29.7	483.0	2.5	[21]
Ta_0.5Hf_0.5C	Ta_0.5Hf_0.5C	HP	99.2	(36.7±1.2)	(559.3±6.5)	(2.9±0.4)	[30]
Ta_0.5Hf_0.5C	Ta_0.5Hf_0.5C	HP	97.9	37.9	591.0	2.5	[21]
Ta_0.5Hf_0.5C	TaC, HfC	SPS	98.2	(17.1±1.1)	(523.8±7.0)	(6.0±0.7)	[40]
Ta_0.5Hf_0.5C	TaC, HfC	SPS	(95.7±0.3)	(22.1±1.8)	(549.0±11.2)	(2.9±0.7)	[32]
Ta_0.5Hf_0.5C	TaC, HfC	HIP	>97.0	23.5	469.9	—	[3]
Ta_0.3Hf_0.7C	HfO₂, Ta₂O₅, graphite	SPS	98.7	(20.0±0.9)	—	(5.2±0.2)	[48]
Ta_0.25Hf_0.75C	Ta_0.25Hf_0.75C	HP	96.5	(29.9±2.2)	(436.4±13.8)	(2.2±0.2)	[30]
Ta_0.25Hf_0.75C	TaC, HfC	HIP	>98.0	29.1	593.5	—	[3]
Ta_0.2Hf_0.8C	Ta_0.2Hf_0.8C	HP	95.9	(35.1±1.1)	(554.7±8.8)	(2.3±0.5)	[21]
Ta_0.2Hf_0.8C	TaC, HfC	SPS	(87.0±0.2)	(16.7±3.0)	(438.0±17.8)	(3.4±0.6)	[32]
Ta_0.2Hf_0.8C	TaC, HfC	SPS	98.8	(19.1±0.3)	(577.3±6.0)	(5.5±0.6)	[40]
Ta_0.2Hf_0.8C	HfO₂, Ta₂O₅, graphite	SPS	100.0	(19.7±0.7)	—	5.1	[48]
Ta_0.17Hf_0.83C	TaC, HfC	HIP	>98.0	26.6	534.2	—	[3]
Ta_0.1Hf_0.9C	HfO₂, Ta₂O₅, graphite	SPS	99.3	(19.7±0.8)	—	—	[48]

Table 2. Mechanical properties of Ta_xHf_1-_xC solid solution ceramics at room temperature

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