Formation of secondary borides in liquid phase-sintered B6O materials

Formation of secondary borides in liquid phase-sintered B6O materials
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液相烧结 B6O 材料中二次硼化物的形成

DOI:
10.1016/j.jeurceramsoc.2015.12.041
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发表时间:
2016
影响因子:
5.7
通讯作者:
Müller C. Michaelis A.
Müller C. Michaelis A.
中科院分区:
材料科学1区
文献类型:
--
作者:
Thiele M. Herrmann M;Müller C. Michaelis A.

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添加Al_2O_3/Y_2O_3添加剂的液态烧结B_2O_3材料比纯B_2O_3材料具有更高的断裂韧性和强度水平。然而,热压和放电等离子烧结(FAST/SPS)材料的高添加剂含量导致了强度极限硼化物析出物的形成。晶界相B_2O_3含量的系统变化和热力学计算表明,通过控制致密化过程中B_2O_3的分解,通过直接加入B_2O_3或通过添加的过渡金属氧化物(如TiO_2)与起始成分反应生成B_2O_3,可以避免硼化物的形成。
Liquid phase-sintered B6O materials with Al2O3/Y2O3additives were recently developed to yield higher fracture toughness and strength levels than those of pure B6O-materials. However, the high additive contents of hot-pressed and spark plasma-sintered (FAST/SPS) materials led to the formation of strength-limiting boride precipitates. Systematic variation of the B2O3content of the grain boundary phase and thermodynamic calculations carried out in the present work showed that it is possible to avoid boride formation by controlling the decomposition of B2O3during densification and adjusting the B2O3content of the composition through direct addition of B2O3or through reaction of added transition metal oxides such as TiO2with the starting composition to form B2O3.
含有钴烧结添加剂的低氧化硼材料
DOI: --
发表时间: 2010
期刊:
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