Synthesis of rod-like β-Si3N4 seed crystals with tailored morphology

Synthesis of rod-like β-Si3N4 seed crystals with tailored morphology
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具有定制形貌的棒状β-Si3N4 籽晶的合成

DOI:
10.1016/j.ceramint.2014.12.091
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发表时间:
2015-05
影响因子:
5.2
通讯作者:
Kozo Ishizaki
Kozo Ishizaki
中科院分区:
材料科学1区
文献类型:
--
作者:
Zhao-Yun Xu;Feng Jin;Jian-Feng Yang;Kozo Ishizaki

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采用(α+β)-Si 3 N4粉末为原料,添加Y2 O3 +MgO,在1800 °C烧结合成了β-Si 3 N4晶种。在1800 °C下1小时可实现完全的α-相至β-相转变。在烧结过程中,β-Si 3 N4颗粒起到了形核的作用。通过控制α/β-Si 3 N4的比例,可以调控β-Si 3 N4晶种的长度和平均长径比,从而形成不同的晶核和驱动力。A95 B5样品中β-晶核含量为5%时,样品的尺寸分布为双峰型,其中含有大量直径明显增大的异常细长β-Si 3 N4晶粒。随着β相含量从5wt%增加到100wt%,β-Si 3 N4单晶的平均直径和长径比分别从1.43 μm和4.36减小到0.92 μm和2.79。
β-Si3N4seed crystals were synthesized by sintering (α+β)-Si3N4powders with Y2O3+MgO additives at 1800 °C. Full α- to β-phase transformation was achievable at 1800 °C for 1 h. The pre-existing β-Si3N4particles acted as nuclei during a sintering process. The length and mean aspect ratio of β-Si3N4seed grains could be tailored by careful control of α/β-Si3N4ratio, which resulted in various nuclei and driving force. The sample A95B5 with 5% β-nuclei shows a bimodal size distribution containing large amount of abnormal elongated β-Si3N4grains with remarkable large diameter. With increasing the β-phase content from 5 wt% to 100 wt%, the average diameter and aspect ratio of the β-Si3N4single crystals decreased from 1.43 µm to 0.92 µm and from 4.36 to 2.79, respectively.
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