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首页> 外文期刊>Materials Science and Engineering >Effect of nano-sized sintering additives on microstructure and mechanical properties of Si_3N_4 ceramics
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Effect of nano-sized sintering additives on microstructure and mechanical properties of Si_3N_4 ceramics

机译：纳米烧结助剂对Si_3N_4陶瓷微观结构和力学性能的影响

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摘要

Nano-sized sintering additives such as MgO, Al2O3, Y2O3 and La2O3 are added to process Si3N4 based ceramics. The effects of such sintering additives on the phase transformation, mechanical properties and microstructure of silicon nitride were investigated. XRD analysis of sintered silicon nitride with these sintering additives have shown the complete transformation of alpha-Si3N4 into beta-Si3N4. The silicon nitride ceramics sintered with nano-sized additives (4MgO-4Al(2)O(3)-5La(2)O(3)) have exhibited the highest fracture toughness. This is not only due to the weak glass' grain interface but also due to the formation of high aspect ratio grains (beta-Si3N4). Superior mechanical properties of Si3N4 can be obtained by way of adding small and large RE(3+ )radii RE2O3 (Y2O3 and La2O3) together than the addition of single RE2O3.
机译：添加纳米尺寸的烧结添加剂，例如MgO，Al2O3，Y2O3和La2O3，以处理基于Si3N4的陶瓷。研究了这种烧结助剂对氮化硅的相变，力学性能和微观结构的影响。用这些烧结助剂对氮化硅进行烧结的XRD分析表明，α-Si3N4完全转变为β-Si3N4。纳米尺寸的添加剂（4MgO-4Al（2）O（3）-5La（2）O（3）烧结的氮化硅陶瓷具有最高的断裂韧性。这不仅是由于玻璃的晶粒界面较弱，而且还因为形成了高纵横比的晶粒（β-Si3N4）。与添加单个RE2O3相比，通过将大小不同的RE（3+）半径RE2O3（Y2O3和La2O3）加在一起，可以获得Si3N4的优异机械性能。

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