Effects of Al addition on densification, microstructure and mechanical properties of TaC-Al ceramics
Effects of Al addition on densification, microstructure and mechanical properties of TaC-Al ceramics
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Al添加对TaC-Al陶瓷致密化、显微组织和力学性能的影响
DOI：
10.1016/j.jallcom.2018.06.332
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发表时间：
2018-10
影响因子：
6.2
通讯作者：
Feng Ye
中科院分区：
文献类型：
--
作者：
Lianbing Zhong;Limeng Liu;Guihong Geng;Yujin Wang;Feng Ye
以0.25- 3.40wt%的Al为致密化助剂，在1900 ℃、30 MPa、60 min条件下热压烧结制备了碳化钽陶瓷。研究了Al对TaC-Al陶瓷的致密化、相组成、显微结构和力学性能的影响。Al是一种有效的吸氧剂，它与TaC颗粒表面的Ta 2 O 5等挥发性氧杂质反应生成不挥发的Al 2 O3相，通过抑制非致密物质的蒸发-冷凝输运，从而减缓了TaC颗粒的生长。当Al含量大于10Al +3 Ta_2 O_5 = 6 Ta +5Al_2 O_3的完全杂质反应所需的值时，在高温下Al液体的存在改善了TaC-Al陶瓷的致密化，因为Al液体沿着晶界扩散并润湿TaC晶粒。当Al添加量为0.75，1.50和3.40wt%时，TaC陶瓷的相对密度分别达到91.6，97.5和100%，平均晶粒尺寸为3.5-4.8 μm。Fe杂质溶解在Al中形成Al 6 Fe，Al与TaC发生轻微反应，在TaC晶粒周围形成一薄层Ta-Al-C化合物。添加1.50-3.40 wt% Al的TaC陶瓷具有良好的维氏硬度、杨氏模量和弯曲强度，分别在12.4-13.2 GPa、413-479 GPa和532-673 MPa范围内。在600 °C的空气中观察到TaC陶瓷的抗氧化性增加，并添加少量百分比的Al。
Tantalum carbide ceramics containing 0.25–3.40 wt% Al as densifying aid were prepared by hot pressing at 1900 °C under 30 MPa for 60 min. Effects of Al addition on densification, phase composition, microstructure and mechanical properties of the TaC-Al ceramics were investigated. Al was an effective oxygen getter which reacted with volatile oxygen impurities such as Ta2O5on surfaces of TaC particles to form non-volatile minor phase of Al2O3, thus slowed TaC grain growth via inhibiting the non-densifying matter transport by evaporation-condensation. When Al content was larger than the value that was needed for complete impurity reaction of 10Al + 3Ta2O5= 6Ta + 5Al2O3, presence of Al liquid at high temperatures improved densification of the TaC-Al ceramics because Al liquid spread along the grain boundaries and wet the TaC grains. The TaC ceramic with 0.75, 1.50 and 3.40 wt% Al addition reached a relative density value of 91.6, 97.5 and 100%, respectively, with a similar average grain size of 3.5–4.8 μm. Fe impurity dissolved in Al and formed Al6Fe; slight reaction of Al with TaC formed a thin layer of Ta-Al-C compound around TaC grains. The TaC ceramic with 1.50–3.40 wt% Al additions showed good Vickers hardness, Young's modulus and flexural strength in the range of 12.4–13.2 GPa, 413–479 GPa and 532–673 MPa, respectively. Increase in oxidation resistance of TaC ceramics was observed at 600 °C in air with a few percentages of Al additions.
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DOI：
10.1016/j.jeurceramsoc.2010.10.036
发表时间：
2011-04-01
影响因子：
5.7
作者：
Silvestroni, L.;Bellosi, A.;Zhang, G. J.
通讯作者：
Zhang, G. J.
致密化%20of%20钽%20碳化物%20陶瓷%20with%205%20mol.%%20Al,%20Cu,%20Ag%20and%20Au
影响因子：
6
作者：
Zhonghong Lai;Feng Ye;Zhiguo Zhang;Yu Zhou
通讯作者：
Yu Zhou
DOI：
10.1016/j.jeurceramsoc.2010.01.032
发表时间：
2010-08-01
影响因子：
5.7
作者：
Talmy, I. G.;Zaykoski, J. A.;Opeka, M. M.
通讯作者：
Opeka, M. M.
影响因子：
13.1
作者：
L. Silvestroni;L. Pienti;S. Guicciardi;D. Sciti
通讯作者：
L. Silvestroni;L. Pienti;S. Guicciardi;D. Sciti
影响因子：
5.2
作者：
L. Pienti;L. Silvestroni;E. Landi;C. Melandri;D. Sciti
通讯作者：
L. Pienti;L. Silvestroni;E. Landi;C. Melandri;D. Sciti