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Inner Surface Modification of a Tube by Magnetic Glow-Arc Plasma Source Ion Implantation 总被引:3,自引:0,他引:3
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A new method named the magnetic glow-arc plasma source ion implantation (MGA-PSⅡ) is proposed for inner surface modification of tubes. In MGA-PSⅡ, under the control of an axial magnetic field, which is generated by an electric coil around the tube sample, glow arc plasma moves spirally into the tube from its two ends. A negative voltage applied on the tube realized its inner surface implantation. Titanium nitride (TIN) films are prepared on the inner surface of a stainless steel tube in diameter 90mm and length 600mm. Hardness tests show that the hardness at the tube centre is up to 20 GPa. XRD, XPS and AES analyses demonstrate that good quality of TiN films can be achieved. 相似文献
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数学核心素养培养的途径和载体很多,本文以“弧度制”为例,通过合适的情境创设和有效的问题设计落实核心素养的培养,并给出案例反思. 相似文献
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[考试内容及考试要求]考试内容:角的概念的推广,弧度制,任意角的三角函数,单位圆中的三角函数线,同角三角函数的基本关系式,正弦、余弦的诱导公式,两角和与差的正弦、余弦、正切,二倍角的正弦、余弦、正切, 相似文献
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