Effect of titanium diboride on the homogeneity of boron carbide ceramic by flash spark plasma sintering

Effect of titanium diboride on the homogeneity of boron carbide ceramic by flash spark plasma sintering
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二硼化钛对闪光放电等离子烧结碳化硼陶瓷均匀性的影响

DOI:
10.1016/j.ceramint.2018.05.179
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发表时间:
2018-09
影响因子:
5.2
通讯作者:
Fu Zhengyi
Fu Zhengyi
中科院分区:
材料科学1区
文献类型:
--
作者:
Wu Jiawei;Niu Bo;Zhang Fan;Lei Liwen;Zhang Jinyong;Ren Lin;Wang Weimin;Fu Zhengyi

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一种新颖的方法,即闪速放电等离子烧结(FSPS),将闪速烧结和电场辅助烧结相结合,用于致密化碳化硼/二硼化钛(B4C/TiB2)复合材料。进一步系统研究了不同TiB2含量复合材料的烧结均匀性并建立了理论模型。结果表明,添加 50wt% TiB2 可使 B4C/TiB2 复合材料在 1872°C、4MPa 压力下 60 秒内致密化高达 97.7%,区域范围为 1.9%。 TiB2网络的优先路径被证明可以通过隧道效应、第一阶段的电子场发射效应和后期的低电阻复合路径来分散中心电流并将热流分布到整个样品中,从而有助于提高均匀性。
A novel method, namely flash spark plasma sintering (FSPS), combining flash sintering and electric field assisted sintering, was utilized to densify boron carbide/titanium diboride (B4C/TiB2) composites. Further, sintering homogeneity of the composites with different contents of TiB2was systematically investigated and theoretical model was built. Results indicated that addition of 50 wt% TiB2 led to the densification of B4C/TiB2composite by up to 97.7% with regional range 1.9% at 1872 °C under pressure of 4 MPa in 60 s. The preferential pathway of TiB2network proves to disperse the central current and distribute thermal flow throughout the specimen possibly via tunneling, electronic field emission effect at first stage and lower-resistance composite pathway latter, contributing to the increased homogeneity.
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