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首页> 外文期刊>American journal of applied sciences >Effect of Y~2O~3 Additions on Microstructure and Properties of Alumina-Magnesia Ceramics
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Effect of Y~2O~3 Additions on Microstructure and Properties of Alumina-Magnesia Ceramics

机译：添加Y〜2O〜3对氧化铝镁陶瓷的组织和性能的影响

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摘要

The purposes of this research are to prepare and investigate the characterization of 0.7MgO-xY_2O_3-(99.3-x)Al_2O_3, by varies x at 0.0, 2.0, 4.0, 6.0, 8.0 and 10.0 wt% (AMY). AMY samples were synthesized by solid state reaction under two different sintering methods conventional sintering method (NS) and two stage sintering method (TS). Ceramic samples were sintered by conventional sintering at 1600°C for 5 h and using two stage sintering with the first sintering temperature (T_1) at 1600°C for 30 min and cooling down to the second sintering temperature (T_2) at 1450°C for 10 h. The phase composition of the samples were characterized using XRD technique. XRD patterns from two method sintering revealed phase combination of Al_2O_3„ MgAl_2O_4, MgO and Y_2O_3. It was found that it is not different XRD patterns from two method sintering. SEM micrographs form NM and TS showed that the shape of the ceramic grains were polyhedron and ellipsoid, while the grain sizes form NS were in the range of 0.91-1.00 urn and the grain sizes from TS were in the range of 0.34-0.48 urn. The samples from NS and TS is showed optimum mechanical properties by AMY with Y_2O_3 additions between 4-6 wt%.
机译：这项研究的目的是准备和研究0.7MgO-xY_2O_3-（99.3-x）Al_2O_3的特征，方法是在0.0、2.0、4.0、6.0、8.0和10.0 wt％（AMY）处变化x。在两种不同的烧结方法，常规烧结方法（NS）和两阶段烧结方法（TS）下，通过固相反应合成AMY样品。陶瓷样品通过常规烧结在1600°C下烧结5小时，并使用两阶段烧结，第一阶段的烧结温度（T_1）在1600°C烧结30分钟，然后冷却至第二阶段的烧结温度（T_2）在1450°C进行烧结。 10小时使用XRD技术表征样品的相组成。两种方法烧结的XRD图谱表明Al_2O_3„ MgAl_2O_4，MgO和Y_2O_3的相组合。发现与两种方法烧结没有不同的XRD图案。 NM和TS的SEM照片显示，陶瓷晶粒的形状为多面体和椭圆形，而NS的晶粒尺寸在0.91-1.00 um范围内，TS的晶粒尺寸在0.34-0.48 um范围内。 NS和TS的样品通过AMY表现出最佳的机械性能，其中Y_2O_3添加量为4-6 wt％。

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