首页> 外文期刊>Advanced Powder Technology: The internation Journal of the Society of Powder Technology, Japan >Structure of strength-limiting flaws in alumina ceramics made by the powder granule compaction process
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Structure of strength-limiting flaws in alumina ceramics made by the powder granule compaction process

机译:粉末颗粒压实工艺制得的氧化铝陶瓷的强度极限缺陷结构

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摘要

Alumina ceramics were made by the powder granule compaction process and the structure of strength-limiting flaws was examined.Optically projected images obtained by transmission optical microscopy for a thin alumina specimen revealed that there were many round-shape large flaws of several tens of microns.The cross-sectional views of the large flaws observed after polishing the thinned specimen clearly showed that their structure was a crack-like pore rather than a spherical one.The fractography indicated that the fracture of the alumina ceramics originated at the crack-like pore which was a part of the corresponding large flaws located near the tensile surface of the specimen.The internal structure of the compact before firing was examined by the liquid immersion method.It was clearly shown that the large flaws resulted from non-uniform powder packing associated with granule deformation during compaction.
机译:通过粉末颗粒压实工艺制备氧化铝陶瓷,并检查了强度限制缺陷的结构。通过透射光学显微镜获得的薄氧化铝样品的光学投影图像显示存在许多数十微米的圆形大缺陷。抛光薄的试样后观察到的大缺陷的横截面图清楚地表明它们的结构是裂纹状的孔而不是球形的孔。断口图表明氧化铝陶瓷的断裂起源于裂纹状的孔,试样是在试样拉伸表面附近的相应大缺陷的一部分。通过液体浸没法检查了烧成前坯体的内部结构,清楚地表明,大缺陷是由与粉末相关的不均匀粉末堆积造成的。压实过程中颗粒变形。

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