Nano-(Ta, Zr)C Precipitates at Multigrain Conjunctions in TaC Ceramic with 10 mol% ZrC and 5 mol% Cu as Sintering Aid

Nano-(Ta, Zr)C Precipitates at Multigrain Conjunctions in TaC Ceramic with 10 mol% ZrC and 5 mol% Cu as Sintering Aid
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纳米(Ta,%20Zr)C%20沉淀%20at%20多晶%20连接%20in%20TaC%20陶瓷%20与%2010%20mol%%20ZrC%20和%205%20mol%%20Cu%20as%20烧结%20Aid

DOI:
10.1155/2018/1634814
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发表时间:
2018-01
影响因子:
--
通讯作者:
Liu Limeng
Liu Limeng
中科院分区:
材料科学4区
文献类型:
--
作者:
Zhong Lianbing;Geng Guihong;Wang Yujin;Ye Feng;Liu Limeng

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采用10mol%ZrC +5mol%Cu作为烧结助剂,通过热压制备了完全致密的TaC陶瓷。通过TaC和ZrC之间的反应形成(Ta,Zr)C固溶体(ss)促进致密化。Cu的加入细化了TaC陶瓷的显微结构,从而提高了TaC陶瓷的抗弯强度。TEM研究发现,无处不在的沉淀纳米微晶在多晶粒连接。该纳米复合材料为(Ta,Zr)C固溶体,均匀分散在富氧玻璃基体中。虽然纳米沉淀物的形成可能不会对TaC陶瓷的机械性能产生太大影响,但这种结构表明了一种值得进一步研究的新型纳米陶瓷。
A fully dense TaC ceramic was prepared by hot pressing using 10 mol% ZrC plus 5 mol% Cu as a sintering aid. Formation of (Ta, Zr)C solid solution (ss) by reaction between TaC and ZrC facilitated densification. Addition of Cu refined the microstructure and consequently improved flexural strength of the TaC ceramics. TEM investigation found ubiquitous precipitation of nanocrystallites at multigrain conjunctions. The nanocrystallites were (Ta, Zr)C solid solution with uniform dispersion in an oxygen-rich glassy matrix. Although formation of nanoprecipitates may not much affect the mechanical properties of the TaC ceramic, the structure suggested a new type of nanoceramic worth further research.
显微组织%20and%20机械%20性能%20of%20TaC%20陶瓷%20with%201-7.5%20mol%%20Si%20as%20烧结%20aid
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