In situ investigation of the silicon carbide particles sintering
In situ investigation of the silicon carbide particles sintering
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DOI：
10.1155/2011/728617
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发表时间：
2011
影响因子：
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通讯作者：
Y. Niu;F. Xu;Xiaofang Hu;Jian-hua Zhao;H. Miao;Xiaoping Wu;Zhong-xing Zhang
中科院分区：
文献类型：
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作者：
Y. Niu;F. Xu;Xiaofang Hu;Jian-hua Zhao;H. Miao;Xiaoping Wu;Zhong-xing Zhang
利用同步辐射计算机形貌术(SR-CT)，实时观察了异形碳化硅粉末在固相烧结过程中的微观结构演变。从2D和3D重建图像中可以清楚地区分烧结过程中的烧结颈生长和材料迁移过程。为了定量分析固相烧结过程中的烧结动力学，给出了样品的烧结颈尺寸。得到了颈围尺寸-时间曲线。与传统的烧结理论相比，SR-CT实验得到的颈长指数(7.87)大于双球模型的颈长指数。讨论了这种情况，并用烧结颈生长的形式来表示，即当颗粒形状不规则而不是球形时，烧结过程变慢。
A real-time observation of the microstructure evolution of irregularly shaped silicon carbide powders during solid state sintering is realized by using synchrotron radiation computerized topography (SR-CT) technique. The process of sintering neck growth and material migration during sintering are clearly distinguished from 2D and 3D reconstructed images. The sintering neck size of the sample is presented for quantitative analysis of the sintering kinetics during solid state sintering. The neck size-time curve is obtained. Compared with traditional sintering theories, the neck growth exponent (7.87) obtained by SR-CT experiment is larger than that of the two-spheremodel. Such condition is discussed and shown in terms of sintering neck growth, in which the sintering process slows down when the particle shape is irregular rather than spherical.