離子氮化技術應用於發電設備之耐磨、耐蝕與抗疲勞構件

Applying Ion Nitriding on Components of Power Industry to Improve Resistances of Wear Corrosion and Fatigue

根據運轉經驗，許多發電設備常因其主要構件表面損壞而導致設備失去功能。常見的例子如各種發電廠所用循環水泵翼片之凹渦磨蝕（cavitation-erosion）、水力發電廠所用水輪機組件之衝蝕，以及各式閥桿之斷裂等。因為氮化可用於增加材料表面硬度，從而增進其耐磨、耐蝕、耐氧化與抗疲勞等性能，所以氮化是改善上述問題的一種有效方法。離子氮化與傳統氮化法比較，具有許多優點，因此該技術已逐漸應用於工業界。但離子氮化技術在電力工業方面的報導仍缺乏，因此本文乃針對「如何將離子氮化技術應用於電力設備元件，從而延長該設備的壽命？」撰文作一簡單介紹。

According to operation experience, many facilities of power generation lose their function due to surface damage occurring on some critical components. Followings are three typical examples of such failures, such as the cavitation erosion of sea water pump for all types of power plants, the needle valve for hydraulic power stations, and the valve stem for different types of power stations. Increasing surface hardness is an effective and economic method to solve these problems. Nitriding is a good option to increase the surface hardness, in turn, enhance the resistances of wear, corrosion, oxidation, and fatigue. Ionic nitriding owns many advantages over conventional nitriding techniques. Therefore, today it has been widely used in industry. However, the report about applying this technique in power industry is still lack. Hence, this article is aimed at introducing the utilization of ionic nitriding in power industry.