Direct refraction imaging furnace at high temperature for steel sheets using SPring-8

使用 SPring-8 的钢板高温直接折射成像炉

• 批准号: 13650792
• 负责人: KAWASAKI Koichi
• 金额: $ 2.05万
• 依托单位: Niihama National College of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650792/
• 关键词: SPring-8; synchrotron radiation; refraction imaging; direct observation; high temperature; heating furnace; steel sheets; in-situ observation; SPrin-8

1. Furnace fabrication: (1) For the solid observation, the rotation degree of vertical axis ±45°was possible. (2) Material was selected to prevent false image and to get enough image contrast. (3) Maximum sample size was 15mm x 15mm and thickness 0.2-2.0mm, and 1200℃ the highest heating temperature2. Heating method : (1) Heater sheets sandwich the sample. For insulating the sample, thinner alumina sheets are appropriate. When thickness is 0.15mm, S/N ratio is good. Heater sheets were made by sintering carbon sheet of the 0.5mm in thickness, with BN sheets 0 heater cover. (2) On synchrotron radiation energy dependence of the imaging, about 30keV is appropriate. The absorption contrast weakens over 40keV. (3) The effect of surface ruggedness and roughness of degrading images was ignored, if they are machine polishing and electropolishing finish.3. Detector : The SATICON tube direct method x-ray television is combined with on-line image processing equipment. And the observation with quantitativity, super sensitivity, high time resolution and high space resolution is realized. And space resolving power becomes almost 10μm. Super sensitivity=low noise observation become possible with the 1/3 seconds as a time resolution. Visicon tube direct method x-ray television has poor space resolving power. Imaging plate has insufficient space resolving power. And X-ray film is the nonlinear analog detector.4. The optimum technique: It is optimum direct observation technique of steel sheets for refraction and absorption imaging at high temperature, to use direct method x-ray television SATICON tube system arranged with synchrotron radiation energy 30keV in Spring-8.The optimum technique of the heating was as follows. Heater sheets, made by sintering thin carbon sheets, sandwich the sample. For insulating, thin alumina sheets are used with the BN sheets as heater cover.

1. 加热炉制作：(1)固体观测，可实现垂直轴旋转±45°。(2)材料的选择是为了防止虚假图像，并获得足够的图像对比度。(3)试样最大尺寸为15mm × 15mm，厚度0.2 ~ 2.0mm，最高加热温度为1200℃。加热方法：(1)加热片夹在样品中间。为了使样品绝缘，较薄的氧化铝片是合适的。当厚度为0.15mm时，信噪比较好。加热片由0.5mm厚的碳片烧结而成，加热罩为BN片。(2)对同步辐射能量依赖性成像，30keV左右为宜。吸收对比在40keV以上减弱。(3)如果是机器抛光和电抛光，则忽略表面粗糙度和粗糙度对退化图像的影响。探测器：saton显像管直接法x射线电视与在线图像处理设备相结合。实现了定量化、超灵敏度、高时间分辨率和高空间分辨率的观测。空间分辨能力接近10μm。超灵敏度=以1/3秒为时间分辨率的低噪声观测成为可能。显像管直接法x射线电视空间分辨率较差。成像板空间分辨能力不足。而x射线胶片是非线性模拟探测器。最佳技术：在春季-8中，采用同步辐射能量为30keV的直接法x射线电视管系统对钢板进行高温折射吸收成像是最佳的直接观测技术。最佳加热工艺如下：加热片，由烧结薄碳片制成，夹在样品上。为了绝缘，使用薄氧化铝片和BN片作为加热器盖。