Controlled precipitation of W2B4 platelets and of β-WB nanolaminates for the in situ reinforcement of ternary TiB2–W2B4–CrB2 ceramics
Controlled precipitation of W2B4 platelets and of β-WB nanolaminates for the in situ reinforcement of ternary TiB2–W2B4–CrB2 ceramics
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W2B4 片晶和 β-WB 纳米层压材料的受控沉淀,用于三元 TiB2âW2B4âCrB2 陶瓷的原位增强
DOI:
10.1016/j.jeurceramsoc.2011.07.030
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发表时间:
2012
影响因子:
5.7
通讯作者:
R. Telle
中科院分区:
文献类型:
--
作者:
A. Momozawa;R. Telle
Mechanical reinforcement of hard ultrahigh-temperature materials often requires complex processing techniques involving the mixing of platelet-shaped particles into the matrix – ultimately leading to inhomogeneities that compromise strength and fracture toughness. Thus, this paper investigates in situ reinforcement of a TiB2ceramic matrix by controlled precipitation of W2B4platelets and β-WB nanolaminates. The results showed successful precipitation of: (i) W2B4platelets according to the phase diagram, (ii) epitaxial β-WB lamellas, and (iii) spinodal, i.e. fully coherent W-rich lamellas which change to either W2B4platelets or β-WB during ageing. The study of phase amount and microstructure as a function of homogenization temperature and annealing temperature/time regimes allows one to control the volume fraction, size as well as aspect ratio of precipitates. This enables the control of fracture toughness affected by crack deflection, particle pull-out, crack bridging and crack branching. Composition and milling treatment most affect microstructure. Successful precipitation is possible at 1650°C.
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DOI:
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发表时间:
1999
期刊:
影响因子:
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DOI:
--
发表时间:
2001
期刊:
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作者:
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