台灣地區奈米研磨工廠金屬粉塵發生爆炸機率為100％，金屬研磨至奈米階段有高度危險性，本研究係利用以初速度13.1m/s空氣帶動鈦、鐵粒子，撞擊至氣動閥，30nm鈦粉及15nm鐵粉均發生爆炸熔結現象，而45μm鈦粉及150μm鐵粉均無此現象；該奈米級鈦、鐵之最小點火能量（MIE）均小於1mJ，而45μm鈦粉之MIE為21.91mJ，150μm鐵粉之MIE大於1000mJ。表示30nm鈦粉及15nm鐵粉因最小點火能量太小，不適合以高速空氣輸送。

The explosion occurrence rate of metallic powder in Taiwan's nanometer grinding factory is 100%. The stage of grinding metal to nanometer is a stage of high risk. This study investigates the impact of titanium and iron particles using air at initial speed of 13.1m/s to pneumatic valve. Titanium powder of 30nm and iron powder of 15nm all result in explosion phenomena, whereas titanium powder of 45μm and iron powder of 150μm do not have such phenomena. The minimum ignition energy (MIE) of the nanometer class titanium and iron are all less than 1mJ, whereas the MIE of 45μm titanium powder is 21.91mJ and the MIE of 150μm iron powder is greater than 1000mJ.