The determination of inclusion movement in steel castings by positron emission particle tracking (PEPT)
The determination of inclusion movement in steel castings by positron emission particle tracking (PEPT)
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正电子发射粒子追踪（PEPT）测定铸钢件中夹杂物的运动
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
X. Fan
中科院分区：
文献类型：
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作者：
W. D. Griffiths;Y. Beshay;D. J. Parker;X. Fan
利用陶瓷颗粒的放射性标记，研究了夹杂物在铸造过程中的运动，这一过程被称为正电子发射颗粒跟踪(PEPT)。在回旋加速器中，通过将氧气部分转化为18F，使尺寸约为355-710μm的氧化铝和二氧化硅粒子具有放射性。这种同位素的半衰期为110分钟，提供了大约3小时的时间窗口，在这段时间内可以用这项技术检测到粒子。将单个放射性粒子放入陶瓷模具中的已知初始位置，然后在模具中填充低碳钢，使粒子在铸造过程中被带入金属流中。铸件凝固后，使用γ-射线正电子相机确定放射性粒子的最终位置。然后，可以获得铸件中故意夹杂的夹杂物的初始和最终坐标，精度约为5 mm。
The movement of inclusions in casting has been studied using radioactive labelling of ceramic particles, a process known as positron emission particle tracking (PEPT). Alumina and silica particles of size about 355–710 μm were made radioactive in a cyclotron, by the partial conversion of oxygen to 18F. This isotope has a half-life of 110 min, giving a window of time of around 3 h in which the particles could be detected by this technique. Individual radioactive particles were placed in ceramic moulds at known initial positions, which were then filled with low carbon steel, causing the particle to be entrained into the metal stream during the casting process. After the casting had solidified, the final position of the radioactive particle was determined using a γ-ray positron camera. The initial and final co-ordinates of the deliberately entrained inclusions within the casting could then be obtained, with an accuracy of around 5 mm.