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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Effects of α- and β-Si_3N_4 as precursors on combustion synthesis of (α + β)-SiAlON composites
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Effects of α- and β-Si_3N_4 as precursors on combustion synthesis of (α + β)-SiAlON composites

机译：前体α-和β-Si_3N_4对（α+β）-SiAlON复合材料燃烧合成的影响

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摘要

Preparation of (α + β)-SiAlON composites from the powder compacts of Si, Si_3N_4, SiO_2, Al, and AlN was investigated by self-propagating high-temperature synthesis (SHS) in nitrogen of 2.17 MPa. Test samples adopted not only pure α- and β-Si_3N_4, but also a mixture of (α + β)-Si_3N_4. The combustion temperature and flame-front propagation velocity decreased with increasing ratio of Si/Si_3N_4, but they increased with proportion of α / β-Si_3N_4. For the sample containing pure α-Si_3N_4, the synthesis reaction yielded only α-SiAlON with various morphologies including equiaxed crystals, elongated grains, and fine whiskers. As a mixture of (α + β)-Si_3N_4 was employed, the resulting products were (α + β)-SiAlON composites, within which the content of β-SiAlON increased with increasing β-Si_3N_4. For the sample adopting 100% β-Si_3N_4, comparable amounts of α- and β-SiAlON were produced. Additionally, the morphology of (α + β)-SiAlON composites was dominated by elongated grains with a high aspect ratio.
机译：通过在2.17 MPa的氮气中自蔓延高温合成（SHS）研究了由Si，Si_3N_4，SiO_2，Al和AlN的粉末压块制备（α+β）-SiAlON复合材料的过程。测试样品不仅采用纯α-和β-Si_3N_4，而且还采用（α+β）-Si_3N_4的混合物。燃烧温度和火焰前沿传播速度随Si / Si_3N_4比的增加而降低，但随α/β-Si_3N_4的比值而增加。对于包含纯α-Si_3N_4的样品，合成反应仅产生具有各种形态的α-SiAlON，包括等轴晶，细长晶粒和细晶须。作为（α+β）-Si_3N_4的混合物，得到的产物是（α+β）-SiAlON复合物，其中β-SiAlON的含量随β-Si_3N_4的增加而增加。对于采用100％β-Si_3N_4的样品，产生了相当数量的α-和β-SiAlON。另外，（α+β）-SiAlON复合材料的形貌主要由高纵横比的细长晶粒决定。

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